wehub-resource-sync
e84fb4a79e
container project - merge build / Invoke build (push) Successful in 1s
65 lines
2.3 KiB
Swift
65 lines
2.3 KiB
Swift
//===----------------------------------------------------------------------===//
|
|
// Copyright © 2025-2026 Apple Inc. and the container project authors.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// https://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// Pass standard queries to a delegate handler.
|
|
public struct StandardQueryValidator: DNSHandler {
|
|
private let handler: DNSHandler
|
|
|
|
/// Create the handler.
|
|
/// - Parameter delegate: the handler that receives valid queries
|
|
public init(handler: DNSHandler) {
|
|
self.handler = handler
|
|
}
|
|
|
|
/// Ensures the query is valid before forwarding it to the delegate.
|
|
/// - Parameter msg: the query message
|
|
/// - Returns: the delegate response if the query is valid, and an
|
|
/// error response otherwise
|
|
public func answer(query: Message) async throws -> Message? {
|
|
// Reject response messages.
|
|
guard query.type == .query else {
|
|
return Message(
|
|
id: query.id,
|
|
type: .response,
|
|
returnCode: .formatError,
|
|
questions: query.questions
|
|
)
|
|
}
|
|
|
|
// Standard DNS servers handle only query operations.
|
|
guard query.operationCode == .query else {
|
|
return Message(
|
|
id: query.id,
|
|
type: .response,
|
|
returnCode: .notImplemented,
|
|
questions: query.questions
|
|
)
|
|
}
|
|
|
|
// Standard DNS servers only handle messages with exactly one question.
|
|
guard query.questions.count == 1 else {
|
|
return Message(
|
|
id: query.id,
|
|
type: .response,
|
|
returnCode: .formatError,
|
|
questions: query.questions
|
|
)
|
|
}
|
|
|
|
return try await handler.answer(query: query)
|
|
}
|
|
}
|