fix(dns): detect disabled IPv6 support in DNS pinning

Signed-off-by: Benjamin Gaussorgues <benjamin.gaussorgues@nextcloud.com>
nextcloud · Mar 26, 2024 · 559ff57 · 559ff57
1 parent 47ac907
commit 559ff57
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/lib/private/Http/Client/DnsPinMiddleware.php b/lib/private/Http/Client/DnsPinMiddleware.php
@@ -75,7 +75,10 @@ private function dnsResolve(string $target, int $recursionCount) : array {
 		$soaDnsEntry = $this->soaRecord($target);
 		$dnsNegativeTtl = $soaDnsEntry['minimum-ttl'] ?? null;
 
-		$dnsTypes = [DNS_A, DNS_AAAA, DNS_CNAME];
+		// Detect IPv6 support without dependency to php-sockets
+		$dnsTypes = inet_pton('::1') === false
+			? [DNS_A, DNS_CNAME]
+			: [DNS_A, DNS_AAAA, DNS_CNAME];
 		foreach ($dnsTypes as $dnsType) {
 			if ($this->negativeDnsCache->isNegativeCached($target, $dnsType)) {
 				continue;