wehub-resource-sync
e84fb4a79e
container project - merge build / Invoke build (push) Successful in 1s
104 lines
3.8 KiB
Swift
104 lines
3.8 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2026 Apple Inc. and the container project authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//===----------------------------------------------------------------------===//
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import Foundation
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/// Protocol for DNS resource records.
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public protocol ResourceRecord: Sendable {
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/// The domain name this record applies to.
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var name: String { get }
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/// The record type.
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var type: ResourceRecordType { get }
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/// The record class.
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var recordClass: ResourceRecordClass { get }
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/// Time to live in seconds.
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var ttl: UInt32 { get }
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/// Serialize this record into the buffer.
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func appendBuffer(_ buffer: inout [UInt8], offset: Int) throws -> Int
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}
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/// A host record (A or AAAA) containing an IP address.
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public struct HostRecord<T: IPAddressProtocol>: ResourceRecord {
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public let name: String
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public let type: ResourceRecordType
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public let recordClass: ResourceRecordClass
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public let ttl: UInt32
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public let ip: T
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public init(
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name: String,
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ttl: UInt32 = 300,
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ip: T,
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recordClass: ResourceRecordClass = .internet
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) {
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self.name = name
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self.type = T.recordType
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self.recordClass = recordClass
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self.ttl = ttl
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self.ip = ip
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}
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public func appendBuffer(_ buffer: inout [UInt8], offset: Int) throws -> Int {
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let startOffset = offset
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var offset = offset
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// Write name
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let normalized = name.hasSuffix(".") ? String(name.dropLast()) : name
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let dnsName = try DNSName(labels: normalized.isEmpty ? [] : normalized.split(separator: ".", omittingEmptySubsequences: false).map(String.init))
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offset = try dnsName.appendBuffer(&buffer, offset: offset)
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// Write type (big-endian)
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guard let newOffset = buffer.copyIn(as: UInt16.self, value: type.rawValue.bigEndian, offset: offset) else {
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throw DNSBindError.marshalFailure(type: "HostRecord", field: "type")
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}
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offset = newOffset
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// Write class (big-endian)
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guard let newOffset = buffer.copyIn(as: UInt16.self, value: recordClass.rawValue.bigEndian, offset: offset) else {
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throw DNSBindError.marshalFailure(type: "HostRecord", field: "class")
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}
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offset = newOffset
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// Write TTL (big-endian)
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guard let newOffset = buffer.copyIn(as: UInt32.self, value: ttl.bigEndian, offset: offset) else {
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throw DNSBindError.marshalFailure(type: "HostRecord", field: "ttl")
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}
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offset = newOffset
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// Write rdlength (big-endian)
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let rdlength = UInt16(T.size)
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guard let newOffset = buffer.copyIn(as: UInt16.self, value: rdlength.bigEndian, offset: offset) else {
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throw DNSBindError.marshalFailure(type: "HostRecord", field: "rdlength")
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}
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offset = newOffset
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// Write IP address bytes
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guard let newOffset = buffer.copyIn(buffer: ip.bytes, offset: offset) else {
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throw DNSBindError.marshalFailure(type: "HostRecord", field: "rdata")
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}
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let expectedOffset = startOffset + dnsName.size + 10 + T.size
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guard newOffset == expectedOffset else {
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throw DNSBindError.unexpectedOffset(type: "HostRecord", expected: expectedOffset, actual: newOffset)
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}
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return newOffset
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}
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}
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