wehub-resource-sync
415 lines
15 KiB
Swift
415 lines
15 KiB
Swift
//===----------------------------------------------------------------------===//
|
|
// Copyright © 2026 Apple Inc. and the Containerization 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.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#if os(Linux)
|
|
|
|
import ContainerizationIO
|
|
import ContainerizationOS
|
|
import Foundation
|
|
import LCShim
|
|
import Logging
|
|
|
|
actor VsockProxy {
|
|
enum Action {
|
|
case listen
|
|
case dial
|
|
}
|
|
|
|
private enum SocketType {
|
|
case unix
|
|
case vsock
|
|
}
|
|
|
|
let id: String
|
|
|
|
private let path: URL
|
|
private let action: Action
|
|
private let port: UInt32
|
|
private let udsPerms: UInt32?
|
|
private let log: Logger?
|
|
|
|
private var listener: Socket?
|
|
private var task: Task<(), Never>?
|
|
private var connectionTasks: [UUID: Task<(), Never>] = [:]
|
|
|
|
init(
|
|
id: String,
|
|
action: Action,
|
|
port: UInt32,
|
|
path: URL,
|
|
udsPerms: UInt32?,
|
|
log: Logger? = nil
|
|
) {
|
|
self.id = id
|
|
self.action = action
|
|
self.port = port
|
|
self.path = path
|
|
self.udsPerms = udsPerms
|
|
self.log = log
|
|
}
|
|
}
|
|
|
|
extension VsockProxy {
|
|
func start() throws {
|
|
guard listener == nil else {
|
|
return
|
|
}
|
|
|
|
log?.debug(
|
|
"starting proxy",
|
|
metadata: [
|
|
"vport": "\(port)",
|
|
"uds": "\(path)",
|
|
"action": "\(action)",
|
|
])
|
|
|
|
switch action {
|
|
case .dial:
|
|
try dialHost()
|
|
case .listen:
|
|
try dialGuest()
|
|
}
|
|
}
|
|
|
|
func close() throws {
|
|
guard let listener else {
|
|
return
|
|
}
|
|
|
|
log?.debug(
|
|
"stopping proxy",
|
|
metadata: [
|
|
"vport": "\(port)",
|
|
"uds": "\(path)",
|
|
"action": "\(action)",
|
|
])
|
|
|
|
try listener.close()
|
|
|
|
for (_, t) in connectionTasks { t.cancel() }
|
|
connectionTasks.removeAll()
|
|
|
|
if action == .dial {
|
|
let fm = FileManager.default
|
|
if fm.fileExists(atPath: path.path) {
|
|
try fm.removeItem(at: path)
|
|
}
|
|
}
|
|
|
|
task?.cancel()
|
|
self.listener = nil
|
|
}
|
|
|
|
private func dialHost() throws {
|
|
let fm = FileManager.default
|
|
|
|
let parentDir = path.deletingLastPathComponent()
|
|
try fm.createDirectory(
|
|
at: parentDir,
|
|
withIntermediateDirectories: true
|
|
)
|
|
|
|
let type = try UnixType(
|
|
path: path.path,
|
|
perms: udsPerms,
|
|
unlinkExisting: true
|
|
)
|
|
let oldMask = umask(0)
|
|
defer { umask(oldMask) }
|
|
let uds = try Socket(type: type)
|
|
try uds.listen()
|
|
listener = uds
|
|
|
|
try acceptLoop(socketType: .unix)
|
|
}
|
|
|
|
private func dialGuest() throws {
|
|
let type = VsockType(
|
|
port: port,
|
|
cid: VsockType.anyCID
|
|
)
|
|
let vsock = try Socket(type: type)
|
|
try vsock.listen()
|
|
listener = vsock
|
|
|
|
try acceptLoop(socketType: .vsock)
|
|
}
|
|
|
|
private func acceptLoop(socketType: SocketType) throws {
|
|
guard let listener else {
|
|
return
|
|
}
|
|
|
|
let stream = try listener.acceptStream()
|
|
let task = Task {
|
|
do {
|
|
for try await conn in stream {
|
|
let connID = UUID()
|
|
let connTask = Task {
|
|
defer { self.connectionTasks[connID] = nil }
|
|
log?.debug(
|
|
"accepting connection",
|
|
metadata: [
|
|
"vport": "\(port)",
|
|
"uds": "\(path)",
|
|
"action": "\(action)",
|
|
"socketType": "\(socketType)",
|
|
])
|
|
do {
|
|
try await handleConn(
|
|
conn: conn,
|
|
connType: socketType
|
|
)
|
|
} catch {
|
|
self.log?.error("failed to handle connection: \(error)")
|
|
}
|
|
}
|
|
// Safe: actor serialization ensures this runs before connTask can execute its defer.
|
|
connectionTasks[connID] = connTask
|
|
}
|
|
} catch {
|
|
self.log?.error("failed to accept connection: \(error)")
|
|
}
|
|
}
|
|
self.task = task
|
|
}
|
|
|
|
private func handleConn(
|
|
conn: ContainerizationOS.Socket,
|
|
connType: SocketType
|
|
) async throws {
|
|
try await withCheckedThrowingContinuation { (c: CheckedContinuation<Void, Error>) in
|
|
do {
|
|
// `relayTo` isn't used concurrently.
|
|
nonisolated(unsafe) var relayTo: ContainerizationOS.Socket
|
|
|
|
switch connType {
|
|
case .unix:
|
|
let type = VsockType(
|
|
port: port,
|
|
cid: VsockType.hostCID
|
|
)
|
|
relayTo = try Socket(
|
|
type: type,
|
|
closeOnDeinit: false
|
|
)
|
|
case .vsock:
|
|
let type = try UnixType(path: path.path)
|
|
relayTo = try Socket(
|
|
type: type,
|
|
closeOnDeinit: false
|
|
)
|
|
}
|
|
|
|
try relayTo.connect()
|
|
|
|
// `clientFile` isn't used concurrently.
|
|
nonisolated(unsafe) var clientFile = OSFile.SpliceFile(fd: conn.fileDescriptor)
|
|
nonisolated(unsafe) var eofFromClient = false
|
|
// `serverFile` isn't used concurrently.
|
|
nonisolated(unsafe) var serverFile = OSFile.SpliceFile(fd: relayTo.fileDescriptor)
|
|
nonisolated(unsafe) var eofFromServer = false
|
|
|
|
// clean up when any of these conditions apply:
|
|
// - the client has completely hung up or errored
|
|
// - the server has completely hung up or errored
|
|
// - both the client and server have half closed via:
|
|
// - read hangup on epoll
|
|
// - EOF on splice
|
|
let cleanup = { @Sendable [log, port, path, action] in
|
|
log?.debug(
|
|
"cleaning up",
|
|
metadata: [
|
|
"vport": "\(port)",
|
|
"uds": "\(path)",
|
|
"action": "\(action)",
|
|
"eofFromClient": "\(eofFromClient)",
|
|
"eofFromServer": "\(eofFromServer)",
|
|
"clientFd": "\(clientFile.fileDescriptor)",
|
|
"serverFd": "\(serverFile.fileDescriptor)",
|
|
]
|
|
)
|
|
|
|
do {
|
|
try ProcessSupervisor.default.unregisterFd(clientFile.fileDescriptor)
|
|
try ProcessSupervisor.default.unregisterFd(serverFile.fileDescriptor)
|
|
try conn.close()
|
|
try relayTo.close()
|
|
} catch {
|
|
self.log?.error("Failed to clean up vsock proxy: \(error)")
|
|
}
|
|
c.resume()
|
|
}
|
|
|
|
try! ProcessSupervisor.default.registerFd(clientFile.fileDescriptor, mask: [.input, .output]) { mask in
|
|
if mask.readyToRead && !eofFromClient {
|
|
let (fromEof, toEof) = Self.transferData(
|
|
fromFile: &clientFile,
|
|
toFile: &serverFile,
|
|
description: "readyToRead:toServer",
|
|
log: self.log
|
|
)
|
|
eofFromClient = eofFromClient || fromEof
|
|
eofFromServer = eofFromServer || toEof
|
|
}
|
|
|
|
if mask.readyToWrite && !eofFromServer {
|
|
let (fromEof, toEof) = Self.transferData(
|
|
fromFile: &serverFile,
|
|
toFile: &clientFile,
|
|
description: "readyToWrite:toClient",
|
|
log: self.log
|
|
)
|
|
eofFromClient = eofFromClient || toEof
|
|
eofFromServer = eofFromServer || fromEof
|
|
}
|
|
|
|
if mask.isHangup {
|
|
eofFromClient = true
|
|
eofFromServer = true
|
|
} else if mask.isRemoteHangup && !eofFromClient {
|
|
// half close, shut down client to server transfer
|
|
// we should see no more EPOLLIN events on the client fd
|
|
// and no more EPOLLOUT events on the server fd
|
|
eofFromClient = true
|
|
if shutdown(serverFile.fileDescriptor, Int32(SHUT_WR)) != 0 {
|
|
self.log?.warning(
|
|
"failed to shut down client reads",
|
|
metadata: [
|
|
"vport": "\(self.port)",
|
|
"uds": "\(self.path)",
|
|
"errno": "\(errno)",
|
|
"eofFromClient": "\(eofFromClient)",
|
|
"eofFromServer": "\(eofFromServer)",
|
|
"clientFd": "\(clientFile.fileDescriptor)",
|
|
"serverFd": "\(serverFile.fileDescriptor)",
|
|
]
|
|
)
|
|
}
|
|
}
|
|
|
|
if eofFromClient && eofFromServer {
|
|
return cleanup()
|
|
}
|
|
}
|
|
|
|
try! ProcessSupervisor.default.registerFd(serverFile.fileDescriptor, mask: [.input, .output]) { mask in
|
|
if mask.readyToRead && !eofFromServer {
|
|
let (fromEof, toEof) = Self.transferData(
|
|
fromFile: &serverFile,
|
|
toFile: &clientFile,
|
|
description: "readyToRead:toClient",
|
|
log: self.log
|
|
)
|
|
eofFromClient = eofFromClient || toEof
|
|
eofFromServer = eofFromServer || fromEof
|
|
}
|
|
|
|
if mask.readyToWrite && !eofFromClient {
|
|
let (fromEof, toEof) = Self.transferData(
|
|
fromFile: &clientFile,
|
|
toFile: &serverFile,
|
|
description: "readyToWrite:toServer",
|
|
log: self.log
|
|
)
|
|
eofFromClient = eofFromClient || fromEof
|
|
eofFromServer = eofFromServer || toEof
|
|
}
|
|
|
|
if mask.isHangup {
|
|
eofFromClient = true
|
|
eofFromServer = true
|
|
} else if mask.isRemoteHangup && !eofFromServer {
|
|
// half close, shut down server to client transfer
|
|
// we should see no more EPOLLIN events on the server fd
|
|
// and no more EPOLLOUT events on the client fd
|
|
eofFromServer = true
|
|
if shutdown(clientFile.fileDescriptor, Int32(SHUT_WR)) != 0 {
|
|
self.log?.warning(
|
|
"failed to shut down server reads",
|
|
metadata: [
|
|
"vport": "\(self.port)",
|
|
"uds": "\(self.path)",
|
|
"errno": "\(errno)",
|
|
"eofFromClient": "\(eofFromClient)",
|
|
"eofFromServer": "\(eofFromServer)",
|
|
"clientFd": "\(clientFile.fileDescriptor)",
|
|
"serverFd": "\(serverFile.fileDescriptor)",
|
|
]
|
|
)
|
|
}
|
|
}
|
|
|
|
if eofFromClient && eofFromServer {
|
|
return cleanup()
|
|
}
|
|
}
|
|
} catch {
|
|
c.resume(throwing: error)
|
|
}
|
|
}
|
|
}
|
|
|
|
private static func transferData(
|
|
fromFile: inout OSFile.SpliceFile,
|
|
toFile: inout OSFile.SpliceFile,
|
|
description: String,
|
|
log: Logger?
|
|
) -> (Bool, Bool) {
|
|
do {
|
|
let (readBytes, writeBytes, action) = try OSFile.splice(from: &fromFile, to: &toFile)
|
|
log?.trace(
|
|
"transferred data",
|
|
metadata: [
|
|
"description": "\(description)",
|
|
"action": "\(action)",
|
|
"readBytes": "\(readBytes)",
|
|
"writeBytes": "\(writeBytes)",
|
|
"fromFd": "\(fromFile.fileDescriptor)",
|
|
"toFd": "\(toFile.fileDescriptor)",
|
|
]
|
|
)
|
|
if action == .eof {
|
|
// half close, shut down client to server transfer
|
|
// we should see no more EPOLLIN events on the client fd
|
|
// and no more EPOLLOUT events on the server fd
|
|
if shutdown(toFile.fileDescriptor, Int32(SHUT_WR)) != 0 {
|
|
log?.warning(
|
|
"failed to shut down reads",
|
|
metadata: [
|
|
"description": "\(description)",
|
|
"errno": "\(errno)",
|
|
"action": "\(action)",
|
|
"readBytes": "\(readBytes)",
|
|
"writeBytes": "\(writeBytes)",
|
|
"fromFd": "\(fromFile.fileDescriptor)",
|
|
"toFd": "\(toFile.fileDescriptor)",
|
|
]
|
|
)
|
|
}
|
|
return (true, false)
|
|
} else if action == .brokenPipe {
|
|
return (true, true)
|
|
}
|
|
return (false, false)
|
|
} catch {
|
|
return (true, true)
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|