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Included review availability: Your plan provides up to 10 included reviews per hour; 1 remains after this review. WalkthroughChangesThe callback and promise-based DNS RR type validation
Suggested reviewers: Merge Risk: ⚪ Minimal · up to DNS RR-type validation now matches Node.js behavior across callback and promise APIs, with no remaining merge-blocking issue identified. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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LGTM — focused Node-compat fix with thorough test coverage. The inline nit about TLSA is worth a one-line follow-up but isn't a regression (it already failed at the native layer), so not blocking.
Also checked: the positive-path "does not throw synchronously" tests do fire real c-ares queries against localhost, but that matches existing precedent in node-dns.test.js:592-607 and the rejections/callbacks are swallowed, so no flakiness introduced beyond what's already in the suite.
Extended reasoning...
Overview
This PR touches src/js/node/dns.ts to add case-sensitive validation of the rrtype argument in all three resolve entry points (callback Resolver#resolve, dns.promises.resolve, dns.promises.Resolver#resolve), matching Node's behavior of rejecting lowercase values like 'a' with ERR_INVALID_ARG_VALUE. It also fixes dns.promises.Resolver#resolve to throw ERR_INVALID_ARG_TYPE for non-string rrtype instead of silently coercing to null, and removes now-dead .toLowerCase() calls in the result-mapping switches. A new test file with 65 cases exercises all four entry points against both invalid and valid rrtype values.
Security risks
None. This is input validation in the Node-compat JS layer that makes Bun stricter, not laxer. The lookup table uses __proto__: null so it's prototype-pollution-safe. No new syscall paths, no native code touched.
Level of scrutiny
Low-to-medium. This is a small (~40-line production change), mechanical Node-compat fix in the JS layer with no design decisions — the reference behavior is fully determined by Node's lib/internal/dns/callback_resolver.js. The three entry points are updated consistently, the error codes/messages match Node's exactly, and Bun.dns.resolve (the Bun-native API) is intentionally left case-insensitive per its documented contract. The switch-statement changes are safe because validation now guarantees only exact uppercase values reach them.
Other factors
- The one finding (missing
TLSAin the valid set) is a legitimate completeness nit but not a regression:resolve(host, "TLSA")already failed before this PR at the native layer, so no working code breaks. It's a one-line addition the author can take or leave. - The "does not throw synchronously" tests fire real DNS queries; this was flagged and ruled out by verifiers, and matches existing patterns in
test/js/node/dns/node-dns.test.js(lines 592-607) which already runs in CI. - Test coverage is thorough: 4 entry points × 5 invalid values + 4 entry points × 11 valid values + 1 non-string case = 65 tests, with the PR description confirming 21 fail on released Bun and all pass with the fix.
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Addressed the review: TLSA is now in the valid rrtype set (commit 3dec622). All 65 tests in test/js/node/dns/node-dns-rrtype.test.js pass with the debug build. |
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LGTM — the TLSA addition in 3dec622 addresses the earlier feedback.
What was reviewed:
validResolveRRTypesnow matches Node's resolveMap (A/AAAA/ANY/CAA/CNAME/MX/NAPTR/NS/PTR/SOA/SRV/TLSA/TXT) with__proto__: null.- All three
resolveentry points validate identically; the removed.toLowerCase()switches are safe since rrtype is guaranteed uppercase post-validation. promises.Resolver#resolvenow throwsERR_INVALID_ARG_TYPEfor non-strings instead of silently coercing tonull.- Test covers all 4 entry points × invalid/valid matrix and swallows async rejections so it stays hermetic.
Extended reasoning...
Overview
This PR adds case-sensitive rrtype validation to node:dns resolve() in src/js/node/dns.ts to match Node.js, which rejects lowercase rrtype values with ERR_INVALID_ARG_VALUE. It touches the callback Resolver#resolve, dns.promises.resolve, and dns.promises.Resolver#resolve, plus adds a new hermetic test file. The previous review round flagged a missing TLSA entry, which was added in 3dec622 and is confirmed present in the current diff.
Security risks
None. The lookup table uses __proto__: null so it is prototype-pollution safe, and the change only tightens argument validation before any query is issued. No new code paths reach the network or handle untrusted data differently.
Level of scrutiny
Low-to-medium. This is a pure JS-layer Node-compat validation fix following the exact pattern of neighboring validators (validateOrder, validateFamily). No native code, no memory management, no async control-flow changes beyond replacing a silent rrtype = null fallback with the correct throw. The removal of rrtype?.toLowerCase() in the result-mapping switches is safe because validation now guarantees rrtype is one of the exact uppercase strings (or the "A" default) before that code runs.
Other factors
- The new test file exercises all four entry points against both the reject set (lowercase, mixed-case, empty string) and the accept set, asserting the exact Node error code and message. 65 tests, all passing on the PR build and 21 failing on main per the evidence block — the fails-without-fix requirement is met.
- The valid-rrtype tests attach
.catch(() => {})to promise results and use no-op callbacks, so async DNS failures againstlocalhostdon't leak as unhandled rejections; the file needs no network. NAPTRandTLSAare in the valid set but omitted from the "does not throw synchronously" test list — a minor coverage gap, not a correctness issue, since those rrtypes still fail at the native layer until #39512 and a TLSA equivalent land.- No outstanding reviewer comments; the one inline thread from the prior run is resolved.
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Review feedback is addressed and all threads are resolved. The PR is ready and waits on CI. |
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Updated 4:31 PM PT - Sep 3rd, 2026
❌ @robobun, your commit b9eb935 has 1 failures in 🧪 To try this PR locally: bunx bun-pr 39556That installs a local version of the PR into your bun-39556 --bun |
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Inline comments:
In `@test/js/node/dns/node-dns-rrtype.test.js`:
- Around line 24-34: Add NAPTR and TLSA to the rrtype matrix in the test
covering fn, ensuring both newly accepted values are exercised alongside the
existing supported RR types.
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Both automated reviews are complete with no open findings. NAPTR and TLSA stay out of the positive test matrix until the native resolve() map supports them (#39512 adds NAPTR). The PR is ready for a maintainer. |
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LGTM — the TLSA feedback is addressed and the follow-up commit just adds a "BOGUS" case to the invalid-rrtype test list.
Checked that the three resolve entry points get identical validation, the __proto__: null lookup is prototype-safe, and removing ?.toLowerCase() is sound now that rrtype is always a validated uppercase string at the switch. Grepped test/js/node/dns/ for existing lowercase-rrtype call sites that would newly break — none found.
Extended reasoning...
Overview
Small Node-compat fix in src/js/node/dns.ts (~50 lines): adds a null-prototype validResolveRRTypes table and a validateRRType helper, wires it into the three resolve entry points (callback Resolver#resolve, dns.promises.resolve, dns.promises.Resolver#resolve), replaces the rrtype = null fallback in the promises Resolver with a proper ERR_INVALID_ARG_TYPE throw, and drops the now-dead ?.toLowerCase() normalization in the result-mapping switches. A new 44-line test file exercises 4 entry points × invalid/valid rrtype matrices plus the non-string case.
Security risks
None. Pure input validation on a string argument that already had a type check; the lookup table uses __proto__: null so no prototype-pollution vector. No auth/crypto/permissions surface.
Level of scrutiny
Low-to-medium. This is a targeted argument-validation change in the Node compat JS layer, not native code. The failure mode is a synchronous throw before any I/O — worst case is being stricter than Node on some rrtype, which the earlier review round already caught (TLSA, now fixed). The toLowerCase removal was traced: after validation, rrtype is guaranteed to be one of the exact uppercase keys or the default "A", so the switch cases are equivalent.
Other factors
- My prior review flagged the missing
TLSAentry; commit 3dec622 added it and the thread is resolved. Commit 42095bb only adds"BOGUS"to the invalid test list. - The PR includes gate evidence that the new test file fails on main (21 failures) and passes on the branch, satisfying the fails-without-fix requirement.
- Grepped
test/js/node/dns/for existing tests passing lowercase rrtypes — none, so no regressions in the existing suite. - The "does not throw synchronously" tests fire real DNS queries against
localhostwith swallowed rejections/no-op callbacks; this is intentional per the file's header comment and does not depend on network success. - All sibling entry points receive the same fix (matches the repo's fix-the-whole-class rule), and
Bun.dns.resolveis intentionally left case-insensitive per the PR rationale.
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Thanks for the re-review. No action items remain and all threads are resolved. The PR waits on a maintainer. |
An unknown name such as "BOGUS" already threw ERR_INVALID_ARG_VALUE from the native record map, with a different message. The JS check now reports it like Node does. This case comes from #39619. Co-authored-by: deepshekhardas <deepshekharadas1234@gmail.com>
42095bb to
e37b6ed
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Rebased onto main at 0a4e3b1 to refresh the binary-size baseline. The previous run compared a 58-commit-old base against the current canary and failed the size check. The diff is unchanged. The automated review hit a rate limit, no findings to address. |
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The review walkthrough reports no findings and all pre-merge checks pass. Nothing to address on the rebased head e37b6ed. |
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LGTM — the TLSA gap from the earlier round is addressed, and the remaining inline note is a test-coverage nit (adding "constructor" to the negative matrix so the __proto__: null on validResolveRRTypes is actually load-bearing in a test). The implementation itself is correct as-is.
Extended reasoning...
Overview
This PR tightens node:dns resolve() rrtype validation to match Node's case-sensitive behavior. It adds a null-prototype validResolveRRTypes table and a validateRRType() helper in src/js/node/dns.ts, wires it into all three resolve entry points (callback Resolver#resolve, dns.promises.resolve, dns.promises.Resolver#resolve), replaces the now-redundant rrtype?.toLowerCase() switches with exact uppercase comparisons, and fixes dns.promises.Resolver#resolve to throw ERR_INVALID_ARG_TYPE on a non-string instead of coercing to null. A new test file exercises 4 entry points × (6 invalid + 11 valid) rrtypes plus the non-string case.
Security risks
None. This is input validation in the JS compat layer that runs before any DNS query is issued. The null-prototype table correctly guards against prototype-pollution-style lookups ("constructor", "toString"). No new attack surface.
Level of scrutiny
Medium — it's a Node-compat behavior change that turns previously-accepted input (lowercase rrtypes like "a") into a synchronous throw. That's intentional and matches Node exactly, but it is a user-visible tightening. The change is confined to the node:dns JS layer; Bun.dns.resolve keeps its case-insensitive contract. The rrtype table matches Node's resolveMap keys (verified against Node v26.3.0 per the PR description), including NAPTR and TLSA after the earlier review round.
Other factors
- My prior feedback (missing
TLSA) was addressed in ac546f4 and the thread is resolved. The CodeRabbit thread about NAPTR/TLSA in the positive test matrix was correctly declined (native layer doesn't support them yet, so they'd throw synchronously there) and is resolved. - The one open finding this run is a nit: the negative test matrix doesn't include
"constructor", so deleting__proto__: nullfrom the table wouldn't fail any test. Worth adding, but the shipped behavior is correct either way. - Checked that removing
toLowerCase()from the result-mapping switches is safe: aftervalidateRRType,rrtypeis guaranteed to be one of the exact uppercase keys (or the defaulted"A"), socase "A"/case "AAAA"cover the same paths the old lowercase cases did. - The test file swallows async rejections (
result.catch(() => {})) for the positive cases, which is appropriate here — only synchronous validation is under test and the file intentionally avoids depending on a resolver.
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Added "constructor" and "toString" to the invalid rrtype tests (4a43c26). They fail the lookup only because the table has a null prototype, so that guard is now covered. 77 tests pass with the debug build. The review thread is resolved. |
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The updated walkthrough reports no findings on head 4a43c26 and all pre-merge checks pass. No open review threads. The PR waits on CI and a maintainer. |
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LGTM — both prior nits (TLSA in the valid set, "constructor"/"toString" in the negative test matrix) are addressed in the current head.
What was reviewed:
- The three
resolveentry points now gaterrtypeon the same null-prototype key set Node uses, with Node's error code and message; the removedtoLowerCase()in the result switches is safe because only exact-case names reach them. dns.promises.Resolver#resolvenow throwsERR_INVALID_ARG_TYPEfor a non-string instead of coercing tonull.- Confirmed
Bun.dns.resolvekeeps its case-insensitive behavior (the check is only in thenode:dnslayer), and the positive-case test omitsNAPTR/TLSAon purpose since the native map still rejects them.
Extended reasoning...
Overview
This PR touches src/js/node/dns.ts (the node:dns compat layer) and adds test/js/node/dns/node-dns-rrtype.test.js. It adds a null-prototype validResolveRRTypes table matching Node's resolveMap keys and a validateRRType helper, wired into the three resolve entry points (callback Resolver#resolve, dns.promises.resolve, dns.promises.Resolver#resolve). The result-mapping switch statements drop ?.toLowerCase() and compare exact uppercase names, and dns.promises.Resolver#resolve now throws ERR_INVALID_ARG_TYPE for a non-string rrtype instead of silently coercing to null.
Security risks
None. This adds stricter argument validation on user input in the Node compat layer. The lookup table has __proto__: null so inherited property names (constructor, toString) miss — the negative test matrix now covers that. No auth, crypto, or filesystem paths are touched.
Level of scrutiny
Low-to-medium. This is a small, mechanical Node-compat validation fix in a JS builtin (~30 changed lines of source). The change is additive validation before dispatch to the unchanged native path; the only removed behavior (toLowerCase() in the switch) is provably dead once validation guarantees exact-case input. Bun.dns.resolve (the Bun-native API) is unaffected because the check lives only in src/js/node/dns.ts.
Other factors
I raised two nits on earlier revisions of this PR — missing TLSA in the valid set, and missing "constructor"/"toString" in the negative test matrix to guard the null-prototype clause. Both are addressed in commits ac546f4 and 4a43c26, and both threads are resolved. CodeRabbit's suggestion to add NAPTR/TLSA to the positive matrix was correctly declined (the native map still rejects them synchronously). The gate evidence shows 25 failures on unfixed builds and all-pass with the fix, on both ASAN debug and release. No open threads remain.
Replace the allow-list with a map from rrtype to the resolve* method of each surface. An rrtype is valid exactly when a method exists for it, so the JS layer no longer keeps its own copy of the record type table. resolve(hostname, "NAPTR") now reaches resolveNaptr(). TLSA becomes valid when resolveTlsa() lands. resolveCaa(), resolveTxt() and resolveSoa() validate the hostname like the other methods, because resolve() now dispatches to them. The promises resolve() bodies check rrtype before hostname, in Node's order. Restore the message assertion in test-c-ares.js, which passes now. Add a fake server test that checks the QTYPE each resolve(hostname, rrtype) call issues.
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Thanks for the review. The PR is approved on head 4ffa6e7 with no open threads. Ready to merge when CI is green. |
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do we really need to create a long living obj here? https://github.com/oven-sh/bun/pull/39556/changes#diff-d746e008a5a0e9bd15a52f00d1f3035dd5cb955ce3c0f3f5042f08d325f4a333R217-R230
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Note GitHub couldn't provide a complete incremental comparison for this pull request, so CodeRabbit is performing a full review instead. This review may take a little longer. |
…vel maps The three maps built at module load only mirrored Node's resolveMap shape. A switch on rrtype gives the same valid set and the same error without keeping any object alive. Inherited names like "constructor" never match a case, so no null-prototype table is needed. Drop the lowercase "naptr" case from the NAPTR dispatch test: Node rejects it, and so does resolve() now.
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No, it does not. The maps only mirrored the shape of Node resolveMap. Replaced in e296c5b with one switch on rrtype that returns the resolve* method name. Each surface reads that method off its own prototype (or the promises object) at call time and calls it with $call. Same valid set, same ERR_INVALID_ARG_VALUE on a miss, and inherited names like "constructor" never match a case, so the null-prototype tables are gone too. Net 32 insertions, 39 deletions, no module-level objects left. Also dropped the lowercase "naptr" case from the NAPTR dispatch test in node-dns.test.js (it landed from #39512 after this branch forked). Node rejects "naptr", and so does resolve() now. Verified with bun bd: node-dns-rrtype.test.js (85 pass), test-c-ares.js (exit 0), and node-dns.test.js shows only the usual external-network failures in the sandbox. |
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PR body updated to describe the switch in e296c5b. No findings from the automated review on the merge commit. |
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Automated review of the switch rewrite (e296c5b) reports no findings and minimal merge risk. No open threads. Waiting on CI. |
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No new findings on e296c5b. Format, lint, and comment-cop pass. Buildkite build 109830 is running. |
…ethod directly Each resolve() body now switches on rrtype and calls the concrete method for that case. The shared name-lookup helper is gone. The promises resolve* methods validate hostname themselves, as they do in Node, so resolve() no longer needs its own hostname check to keep Node's rrtype-before-hostname order and message.
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Head is 9b35cf7. Per the review, each resolve() is now its own switch whose cases call the concrete resolve* method (6243f24), and the promises resolve* methods validate hostname themselves like Node, so resolve() keeps the rrtype-before-hostname order without a check of its own. The dispatch comment is trimmed (9b35cf7). PR body updated. Verified with bun bd: node-dns-rrtype.test.js 85 pass, test-c-ares.js and the vendored test-dns*.js files exit 0, node-dns.test.js shows only the sandbox network failures. All threads resolved. |
| // $call: the module-level function runs with `this` undefined when destructured. | ||
| switch (rrtype) { | ||
| case "A": | ||
| return Resolver.prototype.resolve4.$call(this, hostname, callback); |
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@robobun why you need to use $call here? just do this.resolve4 etc
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Because of the receiver. resolve is exported straight off InternalResolver.prototype, so import { resolve } from "node:dns" and const { resolve } = require("node:dns") call it with this undefined. this.resolve4 throws a TypeError there. Every other exported method keeps working in that case because #getResolver(this) treats an undefined this as the default resolver. $call(this, ...) forwards whatever receiver we got, so the dispatched method makes the same choice the caller would have made.
If you prefer this.resolve4, the other way is to bind the module-level resolve to a default instance, like Node bindDefaultResolver does. Say the word and I will switch to that.
| .then( | ||
| results => { | ||
| switch (rrtype?.toLowerCase()) { | ||
| case "a": |
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@robobun how we are compensating for this 3 output differences?
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Each case lands on the same output the removed block produced:
- A and AAAA:
resolve4(hostname, callback)andresolve6(hostname, callback)call the nativeresolve(hostname, "A" | "AAAA")and, with no options, returnaddresses.map(mapResolveX). That is the oldresults.map(mapResolveX)branch. - The other ten types: the native
resolve(hostname, rrtype)arm and the nativeresolveXmethod both end indo_resolve_cares::<T>with the sameT(src/runtime/dns_jsc/dns.rs:5003-5030and theresolve_record_fn!list at 5305-5360, for examplestruct_ares_mx_replyfor MX,NsHostentfor NS). Same c-ares query, same record objects. That is the old pass-through branch. - Errors: every
resolveXrejects throughwithTranslatedError, the same handler the old block used, and the callback goes throughvalidateResolve(guardCallback) in each method as before.
The QTYPE dispatch tests in node-dns-rrtype.test.js pin the query each rrtype sends. The one intentional difference: resolve(hostname, "NS" | "SOA") now accepts an empty hostname, because resolveNs("") and resolveSoa("") allow it (allow_empty = true) and Node does too. That is listed in the PR notes.
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Answered both questions in the threads. Short version: $call stays because |
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Updated the stale test comment about the null-prototype table (893c22d). Ciro, your two threads are answered and left open for you. |
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Automated reviews are paused by the bot with no findings on the current head. The two open threads are Ciro's questions, answered and awaiting his reply. Buildkite build 109850 is running on 893c22d. |
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Build 109850 had one red lane: a timeout in test-cluster-primary-error.js on x64-asan, unrelated to this change and reported separately. The other failures were flaky and passed on retry. Retriggered CI once on the same diff (b9eb935). |
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Automated reviews remain paused with no findings. Build 109861 is running on the retrigger. The two open threads are waiting on Ciro. |
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No change in state: reviews paused with no findings, build 109861 still running, two threads waiting on Ciro. |
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Code review bot reports no issues on the current head. Build 109861 is still running. Nothing new to act on. |
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CI on the retrigger (build 109861): 180 of 181 jobs green. The one red lane is a 90s timeout in test/js/third_party/jsonwebtoken/async_sign.test.js on alpine aarch64, reported separately and unrelated to node:dns. The previous build had a different unrelated red lane (a cluster test timeout on x64-asan). Every node:dns test passes on every lane in both builds. I will not retrigger again. The diff is ready; the two open threads wait on your answer, Ciro. |
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Fixes #39553
Problem
dns.resolve("example.com", "a", cb)runs a query in Bun. Node throwsTypeError [ERR_INVALID_ARG_VALUE]: The argument 'rrtype' is invalid. Received 'a'.src/js/node/dns.tsonly checks the type ofrrtypeand passes it to the nativeresolve(). Its record map accepts lowercase names, reports unknown names with a Bun message, and lacksNAPTRalthoughresolveNaptr()exists.dns.promises.Resolver#resolveturns a non-stringrrtypeintonull. Node throwsERR_INVALID_ARG_TYPE.Fix
resolve(hostname, rrtype)(callbackResolver,dns.promises,dns.promises.Resolver) is aswitchonrrtypewhose cases call the concreteresolve*method for that type. The default case throwsERR_INVALID_ARG_VALUEwith Node's message, a non-string throwsERR_INVALID_ARG_TYPE. No helper and no module-level object.resolve()(Background): the valid set is exactly the names with aresolve*method, compared case-sensitively, and inherited names like"constructor"never match a case."NAPTR"works now.TLSAis one case when node:dns: implement resolveTlsa (TLSA records) #36186 addsresolveTlsa().resolve*method validateshostnameitself, as in Node: the callbackresolveCaa(),resolveTxt()andresolveSoa()now usevalidateResolve()like the other nine, and the 24 promises methods callvalidateString(hostname, "hostname"). Soresolve()reportsrrtypebeforehostname, in Node's order, with no check of its own. The old"A"/"AAAA"result mapping is gone,resolve4()andresolve6()do it.test/js/node/dns/node-dns-rrtype.test.js(39 of 109 cases fail on Bun 1.4.0) and the restored assertion in vendoredtest-c-ares.js:70(fails on 1.4.0). The 26 vendoredtest-dns*.jsfiles andnode-dns.test.jsgive the same results before and after.Background
resolveMap, a null-prototype object from rrtype to the function that is alsoResolver.prototype.resolve*(v26.3.0lib/internal/dns/utils.js#L289-L306).resolve()indexes it withrrtypeas given and throws on a miss (callback_resolver.js#L95-L110,promises.js#L347-L362). So"a",""and"constructor"all miss.Bun.dns.resolve()keeps accepting lowercase names (test/js/bun/dns/resolve-dns.test.ts). Onlynode:dnschanges.resolve*method ends in the same c-ares call that the nativeresolve()made for that type (src/runtime/dns_jsc/dns.rs,do_resolve_cares::<T>with the sameT). The dispatch tests pin this: aResolverpointed at a UDP socket on 127.0.0.1 must send the right QTYPE for each of the 12 names.messageline intest-c-ares.jsis Node's text. It was commented out when the file was vendored.Notes
"BOGUS"(commit e37b6ed).NAPTR,TLSApassed the list and failed in native code). Commit 034d199 replaced it with dispatch through null-prototype maps built at module load. @cirospaciari asked whether those long-lived objects were needed. They were not. e296c5b replaced them with a name-lookupswitch, and 6243f24 made eachresolve()its ownswitchthat calls the methods directly, as asked.NAPTRto the nativeresolve()map. That is still useful forBun.dns.resolve(), butnode:dnsno longer needs it. Its test calleddns.promises.Resolver#resolve(name, "naptr")in lowercase, which throws after this PR. Commit e296c5b drops that case and keeps the"NAPTR"one.rrtypebefore the check. Node does not do that, and Bun accepts lower case rrtype values when usingnode:dns#39553 asks for Node's behavior, so this PR is strict. Lenient would be a one-line change on top of this shape.resolve(hostname, "NS" | "SOA")accepts an empty hostname, asresolveNs(""),resolveSoa("")and Node already do.resolveCaa(1, cb),resolveTxt(1, cb),resolveSoa(1, cb)anddns.promises.Resolver#resolve(1)throw the JSERR_INVALID_ARG_TYPEforhostnameinstead of the native one (same code, Node's message shape)."a","","BOGUS","constructor"and"toString"throwERR_INVALID_ARG_VALUEwith the message above on every surface."NAPTR"issues a query.resolve(1, "a")reportsrrtypeon every surface. A non-stringrrtypeindns.promises.Resolver#resolvethrowsERR_INVALID_ARG_TYPE.test/js/node/dns/node-dns.test.js: 29 network tests fail in the sandbox before and after, nothing else changes.bun run lintis clean.tsc -p src/jsreports two diagnostics fewer fordns.tsand no new ones.no test proof · iteration 2 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/node/dns/node-dns.test.js