⏯️ dns: limit tcp retry

database64128 · database64128 · commit f25fa1e5a370 · 2025-08-29T01:53:23.000+08:00
diff --git a/dns/dns.go b/dns/dns.go
@@ -550,16 +550,18 @@ func (r *Resolver) sendQueriesTCP(ctx context.Context, nameString string, querie
 	dialer, clientInfo := r.tcpClient.NewStreamDialer()
 
 	// Retry unanswered queries.
-	for !result.isDone() {
+	for range 2 {
 		b := queries
 		switch {
+		case result.v4done && result.v6done:
+			return
 		case result.v4done:
 			b = b[q4PktEnd:]
 		case result.v6done:
 			b = b[:q4PktEnd]
 		}
 		if !r.doTCP(ctx, dialer, clientInfo, nameString, b, result) {
-			break
+			return
 		}
 	}
 }

Original file line number	Diff line number	Diff line change
`@@ -550,16 +550,18 @@ func (r *Resolver) sendQueriesTCP(ctx context.Context, nameString string, querie`
`550`	`550`	`dialer, clientInfo := r.tcpClient.NewStreamDialer()`
`551`	`551`
`552`	`552`	`// Retry unanswered queries.`
`553`		`- for !result.isDone() {`
	`553`	`+ for range 2 {`
`554`	`554`	`b := queries`
`555`	`555`	`switch {`
	`556`	`+ case result.v4done && result.v6done:`
	`557`	`+ return`
`556`	`558`	`case result.v4done:`
`557`	`559`	`b = b[q4PktEnd:]`
`558`	`560`	`case result.v6done:`
`559`	`561`	`b = b[:q4PktEnd]`
`560`	`562`	`}`
`561`	`563`	`if !r.doTCP(ctx, dialer, clientInfo, nameString, b, result) {`
`562`		`- break`
	`564`	`+ return`
`563`	`565`	`}`
`564`	`566`	`}`
`565`	`567`	`}`