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dns: fix crash on setServers with port 0 #65009

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Merged
nodejs-github-bot merged 2 commits into from
Aug 6, 2026
Merged

dns: fix crash on setServers with port 0 #65009

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948d758
dns: fix crash on setServers with port 0
lazerg Aug 4, 2026
42c89ee
dns: keep type assertions in SetServers
lazerg Aug 4, 2026
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dns: fix crash on setServers with port 0 
Signed-off-by: Lazizbek Ergashev <lazerg2@gmail.com>
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@lazerg
lazerg committed Aug 4, 2026
commit 948d7580ab467b143ba0d92bbe60b2dd4305175c
8 changes: 4 additions & 4 deletions src/cares_wrap.cc
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Expand Up @@ -2251,13 +2251,13 @@ void SetServers(const FunctionCallbackInfo<Value>& args) {
if (!elm->Get(env->context(), 1).ToLocal(&ipValue)) return;
if (!elm->Get(env->context(), 2).ToLocal(&portValue)) return;

CHECK(familyValue->Int32Value(env->context()).FromJust());
CHECK(ipValue->IsString());
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CHECK(portValue->Int32Value(env->context()).FromJust());

int fam = familyValue->Int32Value(env->context()).FromJust();
int32_t fam;
if (!familyValue->Int32Value(env->context()).To(&fam)) return;
node::Utf8Value ip(env->isolate(), ipValue);
int port = portValue->Int32Value(env->context()).FromJust();
int32_t port;
if (!portValue->Int32Value(env->context()).To(&port)) return;

if (!csv.empty()) csv += ',';

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4 changes: 4 additions & 0 deletions test/parallel/test-dns.js
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Expand Up @@ -134,6 +134,10 @@ const portsExpected = [
dns.setServers(ports);
assert.deepStrictEqual(dns.getServers(), portsExpected);

// Port 0 means "use the default port" for c-ares.
dns.setServers(['4.4.4.4:0', '[2001:4860:4860::8888]:0']);
assert.deepStrictEqual(dns.getServers(), ['4.4.4.4', '2001:4860:4860::8888']);

// Link-local IPv6 addresses require a zone index (scope id) to be usable;
// c-ares drops link-local servers configured without one.
dns.setServers(['[fe80::483a:5aff:fee6:1f04]%eth0']);
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