honor C core's naming of verify_peer_callback arguments

src/csharp/Grpc.Core/ChannelCredentials.cs

@@ -226,7 +226,7 @@ namespace Grpc.Core
                 return VerifyPeerCallbackHandler(arg0, arg1, arg2 != IntPtr.Zero);
             }
 
-            private int VerifyPeerCallbackHandler(IntPtr host, IntPtr pem, bool isDestroy)
+            private int VerifyPeerCallbackHandler(IntPtr targetName, IntPtr peerPem, bool isDestroy)
             {
                 if (isDestroy)
                 {
@@ -236,7 +236,7 @@ namespace Grpc.Core
 
                 try
                 {
-                    var context = new VerifyPeerContext(Marshal.PtrToStringAnsi(host), Marshal.PtrToStringAnsi(pem));
+                    var context = new VerifyPeerContext(Marshal.PtrToStringAnsi(targetName), Marshal.PtrToStringAnsi(peerPem));
 
                     return this.verifyPeerCallback(context) ? 0 : 1;
                 }

src/csharp/Grpc.Core/VerifyPeerContext.cs

@@ -27,22 +27,22 @@ namespace Grpc.Core
         /// <summary>
         /// Initializes a new instance of the <see cref="T:Grpc.Core.VerifyPeerContext"/> class.
         /// </summary>
-        /// <param name="targetHost">string containing the host name of the peer.</param>
-        /// <param name="targetPem">string containing PEM encoded certificate of the peer.</param>
-        internal VerifyPeerContext(string targetHost, string targetPem)
+        /// <param name="targetName">The target name of the peer.</param>
+        /// <param name="peerPem">The PEM encoded certificate of the peer.</param>
+        internal VerifyPeerContext(string targetName, string peerPem)
         {
-            this.TargetHost = targetHost;
-            this.TargetPem = targetPem;
+            this.TargetName = targetName;
+            this.PeerPem = peerPem;
         }
 
         /// <summary>
-        /// String containing the host name of the peer.
+        /// The target name of the peer.
         /// </summary>
-        public string TargetHost { get; }
+        public string TargetName { get; }
 
         /// <summary>
-        /// string containing PEM encoded certificate of the peer.
+        /// The PEM encoded certificate of the peer.
         /// </summary>
-        public string TargetPem { get; }
+        public string PeerPem { get; }
     }
 }

src/csharp/ext/grpc_csharp_ext.c

@@ -948,11 +948,11 @@ static void grpcsharp_verify_peer_destroy_handler(void* userdata) {
                              NULL, NULL);
 }
 
-static int grpcsharp_verify_peer_handler(const char* target_host,
-                                         const char* target_pem,
+static int grpcsharp_verify_peer_handler(const char* target_name,
+                                         const char* peer_pem,
                                          void* userdata) {
-  return native_callback_dispatcher(userdata, (void*)target_host,
-                             (void*)target_pem, (void*)0, NULL,
+  return native_callback_dispatcher(userdata, (void*)target_name,
+                             (void*)peer_pem, (void*)0, NULL,
                              NULL, NULL);
 }