Add provider configuration generation.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

WireGuard/Models/Tunnel+Extension.swift

@@ -10,7 +10,90 @@ import Foundation
 
 extension Tunnel {
     public func generateProviderConfiguration() -> [String: Any] {
-        //TODO: generate ProviderConfiguration from tunnel with WireGuard config.
-        return [:]
+        var providerConfiguration = [String: Any]()
+
+        providerConfiguration["title"] = self.title
+        var settingsString = "replace_peers=true\n"
+        if let interface = interface {
+            settingsString += generateInterfaceProviderConfiguration(interface)
+        }
+
+        if let peers = peers?.array as? [Peer] {
+            peers.forEach {
+                settingsString += generatePeerProviderConfiguration($0)
+            }
+
+        }
+
+        providerConfiguration["settings"] = settingsString
+
+        return providerConfiguration
+    }
+
+    private func  generateInterfaceProviderConfiguration(_ interface: Interface) -> String {
+        var settingsString = "replace_peers=true\n"
+
+        if let hexPrivateKey = base64KeyToHex(interface.privateKey) {
+            settingsString += "private_key=\(hexPrivateKey)\n"
+        }
+        if interface.listenPort > 0 {
+            settingsString += "listen_port=\(interface.listenPort)\n"
+        }
+        if let dns = interface.dns {
+            settingsString += "dns=\(dns)\n"
+        }
+        if interface.mtu > 0 {
+            settingsString += "mtu=\(interface.mtu)\n"
+        }
+
+        return settingsString
+    }
+
+    private func  generatePeerProviderConfiguration(_ peer: Peer) -> String {
+        var settingsString = ""
+
+        if let hexPublicKey = base64KeyToHex(peer.publicKey) {
+            settingsString += "public_key=\(hexPublicKey)"
+        }
+        if let presharedKey = peer.presharedKey {
+            settingsString += "preshared_key=\(presharedKey)"
+        }
+        if let endpoint = peer.endpoint {
+            settingsString += "endpoint=\(endpoint)"
+        }
+        if peer.persistentKeepalive > 0 {
+            settingsString += "persistent_keepalive_interval=\(peer.persistentKeepalive)"
+        }
+        if let allowedIPs = peer.allowedIPs {
+            settingsString += "allowed_ip=\(allowedIPs)" // TODO: split on ,
+        }
+
+        return settingsString
     }
 }
+
+private func base64KeyToHex(_ base64: String?) -> String? {
+    guard let base64 = base64 else {
+        return nil
+    }
+
+    guard base64.count == 44 else {
+        return nil
+    }
+
+    guard base64.last == "=" else {
+        return nil
+    }
+
+    guard let keyData = Data(base64Encoded: base64) else {
+        return nil
+    }
+
+    guard keyData.count == 32 else {
+        return nil
+    }
+
+    let hexKey = keyData.reduce("") {$0 + String(format: "%02x", $1)}
+
+    return hexKey
+}

WireGuard/Models/WireGuard.xcdatamodeld/WireGuard.xcdatamodel/contents

@@ -1,18 +1,10 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="14135" systemVersion="17E202" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
-    <entity name="Address" representedClassName="Address" syncable="YES">
-        <attribute name="address" optional="YES" attributeType="String" syncable="YES"/>
-        <relationship name="interface" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Interface" inverseName="adresses" inverseEntity="Interface" syncable="YES"/>
-    </entity>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="14135" systemVersion="17G65" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
     <entity name="Interface" representedClassName="Interface" syncable="YES">
         <attribute name="dns" optional="YES" attributeType="String" syncable="YES"/>
-        <attribute name="fwMark" optional="YES" attributeType="Integer 32" defaultValueString="0" usesScalarValueType="YES" syncable="YES"/>
         <attribute name="listenPort" optional="YES" attributeType="Integer 16" defaultValueString="0" usesScalarValueType="YES" syncable="YES"/>
         <attribute name="mtu" optional="YES" attributeType="Integer 32" defaultValueString="0" usesScalarValueType="YES" syncable="YES"/>
         <attribute name="privateKey" attributeType="String" syncable="YES"/>
-        <attribute name="publicKey" attributeType="String" syncable="YES"/>
-        <attribute name="table" optional="YES" attributeType="String" syncable="YES"/>
-        <relationship name="adresses" toMany="YES" deletionRule="Cascade" destinationEntity="Address" inverseName="interface" inverseEntity="Address" syncable="YES"/>
         <relationship name="tunnel" maxCount="1" deletionRule="Nullify" destinationEntity="Tunnel" inverseName="interface" inverseEntity="Tunnel" syncable="YES"/>
     </entity>
     <entity name="Peer" representedClassName="Peer" syncable="YES">
@@ -29,8 +21,7 @@
         <relationship name="peers" toMany="YES" deletionRule="Cascade" ordered="YES" destinationEntity="Peer" inverseName="tunnel" inverseEntity="Peer" syncable="YES"/>
     </entity>
     <elements>
-        <element name="Address" positionX="-54" positionY="45" width="128" height="75"/>
-        <element name="Interface" positionX="-54" positionY="-9" width="128" height="180"/>
+        <element name="Interface" positionX="-54" positionY="-9" width="128" height="120"/>
         <element name="Peer" positionX="-36" positionY="9" width="128" height="135"/>
         <element name="Tunnel" positionX="160" positionY="192" width="128" height="90"/>
     </elements>

WireGuardNetworkExtension/PacketTunnelProvider.swift

@@ -21,12 +21,6 @@ class PacketTunnelProvider: NEPacketTunnelProvider {
     /// A reference to the WireGuard wrapper object.
     let wireGuardWrapper = WireGuardGoWrapper()
 
-    /// The completion handler to call when the tunnel is fully established.
-    var pendingStartCompletion: ((Error?) -> Void)?
-
-    /// The completion handler to call when the tunnel is fully disconnected.
-    var pendingStopCompletion: (() -> Void)?
-
     // MARK: NEPacketTunnelProvider
 
     /// Begin the process of establishing the tunnel.