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| 1 | +import Foundation |
| 2 | +import os |
| 3 | + |
| 4 | +let startSymbol = "OpenTunnel" |
| 5 | + |
| 6 | +actor TunnelHandle { |
| 7 | + private let logger = Logger(subsystem: Bundle.main.bundleIdentifier!, category: "tunnel-handle") |
| 8 | + |
| 9 | + private let tunnelWritePipe: Pipe |
| 10 | + private let tunnelReadPipe: Pipe |
| 11 | + private let dylibHandle: UnsafeMutableRawPointer |
| 12 | + |
| 13 | + var writeHandle: FileHandle { tunnelReadPipe.fileHandleForWriting } |
| 14 | + var readHandle: FileHandle { tunnelWritePipe.fileHandleForReading } |
| 15 | + |
| 16 | + init(dylibPath: URL) throws(TunnelHandleError) { |
| 17 | + guard let dylibHandle = dlopen(dylibPath.path, RTLD_NOW | RTLD_LOCAL) else { |
| 18 | + throw .dylib(dlerror().flatMap { String(cString: $0) } ?? "UNKNOWN") |
| 19 | + } |
| 20 | + self.dylibHandle = dylibHandle |
| 21 | + |
| 22 | + guard let startSym = dlsym(dylibHandle, startSymbol) else { |
| 23 | + throw .symbol(startSymbol, dlerror().flatMap { String(cString: $0) } ?? "UNKNOWN") |
| 24 | + } |
| 25 | + let openTunnelFn = unsafeBitCast(startSym, to: OpenTunnel.self) |
| 26 | + tunnelReadPipe = Pipe() |
| 27 | + tunnelWritePipe = Pipe() |
| 28 | + let res = openTunnelFn(tunnelReadPipe.fileHandleForReading.fileDescriptor, |
| 29 | + tunnelWritePipe.fileHandleForWriting.fileDescriptor) |
| 30 | + guard res == 0 else { |
| 31 | + throw .openTunnel(OpenTunnelError(rawValue: res) ?? .unknown) |
| 32 | + } |
| 33 | + } |
| 34 | + |
| 35 | + // This could be an isolated deinit in Swift 6.1 |
| 36 | + func close() throws(TunnelHandleError) { |
| 37 | + var errs: [Error] = [] |
| 38 | + if dlclose(dylibHandle) == 0 { |
| 39 | + errs.append(TunnelHandleError.dylib(dlerror().flatMap { String(cString: $0) } ?? "UNKNOWN")) |
| 40 | + } |
| 41 | + do { |
| 42 | + try writeHandle.close() |
| 43 | + } catch { |
| 44 | + errs.append(error) |
| 45 | + } |
| 46 | + do { |
| 47 | + try readHandle.close() |
| 48 | + } catch { |
| 49 | + errs.append(error) |
| 50 | + } |
| 51 | + if !errs.isEmpty { |
| 52 | + throw .close(errs) |
| 53 | + } |
| 54 | + } |
| 55 | +} |
| 56 | + |
| 57 | +enum TunnelHandleError: Error { |
| 58 | + case dylib(String) |
| 59 | + case symbol(String, String) |
| 60 | + case openTunnel(OpenTunnelError) |
| 61 | + case pipe(any Error) |
| 62 | + case close([any Error]) |
| 63 | + |
| 64 | + var description: String { |
| 65 | + switch self { |
| 66 | + case let .pipe(err): return "pipe error: \(err)" |
| 67 | + case let .dylib(d): return d |
| 68 | + case let .symbol(symbol, message): return "\(symbol): \(message)" |
| 69 | + case let .openTunnel(error): return "OpenTunnel: \(error.message)" |
| 70 | + case let .close(errs): return "close tunnel: \(errs.map(\.localizedDescription).joined(separator: ", "))" |
| 71 | + } |
| 72 | + } |
| 73 | +} |
| 74 | + |
| 75 | +enum OpenTunnelError: Int32 { |
| 76 | + case errDupReadFD = -2 |
| 77 | + case errDupWriteFD = -3 |
| 78 | + case errOpenPipe = -4 |
| 79 | + case errNewTunnel = -5 |
| 80 | + case unknown = -99 |
| 81 | + |
| 82 | + var message: String { |
| 83 | + switch self { |
| 84 | + case .errDupReadFD: return "Failed to duplicate read file descriptor" |
| 85 | + case .errDupWriteFD: return "Failed to duplicate write file descriptor" |
| 86 | + case .errOpenPipe: return "Failed to open the pipe" |
| 87 | + case .errNewTunnel: return "Failed to create a new tunnel" |
| 88 | + case .unknown: return "Unknown error code" |
| 89 | + } |
| 90 | + } |
| 91 | +} |
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