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| 1 | +import NetworkExtension |
| 2 | +import os |
| 3 | + |
| 4 | +enum NetworkExtensionState: Equatable { |
| 5 | + case unconfigured |
| 6 | + case disbled |
| 7 | + case enabled |
| 8 | + case failed(String) |
| 9 | + |
| 10 | + var description: String { |
| 11 | + switch self { |
| 12 | + case .unconfigured: |
| 13 | + return "Not logged in to Coder" |
| 14 | + case .enabled: |
| 15 | + return "NetworkExtension tunnel enabled" |
| 16 | + case .disbled: |
| 17 | + return "NetworkExtension tunnel disabled" |
| 18 | + case let .failed(error): |
| 19 | + return "NetworkExtension config failed: \(error)" |
| 20 | + } |
| 21 | + } |
| 22 | +} |
| 23 | + |
| 24 | +/// An actor that handles configuring, enabling, and disabling the VPN tunnel via the |
| 25 | +/// NetworkExtension APIs. |
| 26 | +extension CoderVPNService { |
| 27 | + func configureNetworkExtension(proto: NETunnelProviderProtocol) async { |
| 28 | + // removing the old tunnels, rather than reconfiguring ensures that configuration changes |
| 29 | + // are picked up. |
| 30 | + do { |
| 31 | + try await removeNetworkExtension() |
| 32 | + } catch { |
| 33 | + logger.error("remove tunnel failed: \(error)") |
| 34 | + neState = .failed(error.localizedDescription) |
| 35 | + return |
| 36 | + } |
| 37 | + logger.debug("inserting new tunnel") |
| 38 | + |
| 39 | + let tm = NETunnelProviderManager() |
| 40 | + tm.localizedDescription = "CoderVPN" |
| 41 | + tm.protocolConfiguration = proto |
| 42 | + |
| 43 | + logger.debug("saving new tunnel") |
| 44 | + do { |
| 45 | + try await tm.saveToPreferences() |
| 46 | + } catch { |
| 47 | + logger.error("save tunnel failed: \(error)") |
| 48 | + neState = .failed(error.localizedDescription) |
| 49 | + } |
| 50 | + } |
| 51 | + |
| 52 | + func removeNetworkExtension() async throws(VPNServiceError) { |
| 53 | + do { |
| 54 | + let tunnels = try await NETunnelProviderManager.loadAllFromPreferences() |
| 55 | + for tunnel in tunnels { |
| 56 | + try await tunnel.removeFromPreferences() |
| 57 | + } |
| 58 | + } catch { |
| 59 | + throw .internalError("couldn't remove tunnels: \(error)") |
| 60 | + } |
| 61 | + } |
| 62 | + |
| 63 | + func enableNetworkExtension() async { |
| 64 | + do { |
| 65 | + let tm = try await getTunnelManager() |
| 66 | + if !tm.isEnabled { |
| 67 | + tm.isEnabled = true |
| 68 | + try await tm.saveToPreferences() |
| 69 | + logger.debug("saved tunnel with enabled=true") |
| 70 | + } |
| 71 | + try tm.connection.startVPNTunnel() |
| 72 | + } catch { |
| 73 | + logger.error("enable network extension: \(error)") |
| 74 | + neState = .failed(error.localizedDescription) |
| 75 | + return |
| 76 | + } |
| 77 | + logger.debug("enabled and started tunnel") |
| 78 | + neState = .enabled |
| 79 | + } |
| 80 | + |
| 81 | + func disableNetworkExtension() async { |
| 82 | + do { |
| 83 | + let tm = try await getTunnelManager() |
| 84 | + tm.connection.stopVPNTunnel() |
| 85 | + tm.isEnabled = false |
| 86 | + |
| 87 | + try await tm.saveToPreferences() |
| 88 | + } catch { |
| 89 | + logger.error("disable network extension: \(error)") |
| 90 | + neState = .failed(error.localizedDescription) |
| 91 | + return |
| 92 | + } |
| 93 | + logger.debug("saved tunnel with enabled=false") |
| 94 | + neState = .disbled |
| 95 | + } |
| 96 | + |
| 97 | + private func getTunnelManager() async throws(VPNServiceError) -> NETunnelProviderManager { |
| 98 | + var tunnels: [NETunnelProviderManager] = [] |
| 99 | + do { |
| 100 | + tunnels = try await NETunnelProviderManager.loadAllFromPreferences() |
| 101 | + } catch { |
| 102 | + throw .internalError("couldn't load tunnels: \(error)") |
| 103 | + } |
| 104 | + if tunnels.isEmpty { |
| 105 | + throw .internalError("no tunnels found") |
| 106 | + } |
| 107 | + return tunnels.first! |
| 108 | + } |
| 109 | +} |
| 110 | + |
| 111 | +// we're going to mark NETunnelProviderManager as Sendable since there are official APIs that return |
| 112 | +// it async. |
| 113 | +extension NETunnelProviderManager: @unchecked @retroactive Sendable {} |
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