[dart:io] Parse scoped IPv6 in constructor of InternetAddress

Bug: #41663
Change-Id: Ic7a140bc335e56550e39bb30390247db668c6101
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/147060
Commit-Queue: Zichang Guo <zichangguo@google.com>
Reviewed-by: Jonas Termansen <sortie@google.com>
Reviewed-by: Zach Anderson <zra@google.com>

Author: zichangg

runtime/bin/io_natives.cc

@@ -82,6 +82,7 @@ namespace bin {
   V(Filter_Process, 4)                                                         \
   V(Filter_Processed, 3)                                                       \
   V(InternetAddress_Parse, 1)                                                  \
+  V(InternetAddress_ParseScopedLinkLocalAddress, 1)                            \
   V(InternetAddress_RawAddrToString, 1)                                        \
   V(IOService_NewServicePort, 0)                                               \
   V(Namespace_Create, 2)                                                       \

runtime/bin/socket_base.cc

@@ -243,6 +243,31 @@ void FUNCTION_NAME(InternetAddress_Parse)(Dart_NativeArguments args) {
   }
 }
 
+void FUNCTION_NAME(InternetAddress_ParseScopedLinkLocalAddress)(
+    Dart_NativeArguments args) {
+  const char* address =
+      DartUtils::GetStringValue(Dart_GetNativeArgument(args, 0));
+  // This must be an IPv6 address.
+  intptr_t type = 1;
+  ASSERT(address != NULL);
+  OSError* os_error = NULL;
+  AddressList<SocketAddress>* addresses =
+      SocketBase::LookupAddress(address, type, &os_error);
+  if (addresses != NULL) {
+    Dart_Handle list = Dart_NewList(addresses->count());
+    for (intptr_t i = 0; i < addresses->count(); i++) {
+      SocketAddress* addr = addresses->GetAt(i);
+      Dart_ListSetAt(
+          list, i, Dart_NewInteger(SocketAddress::GetAddrScope(addr->addr())));
+    }
+    delete addresses;
+    Dart_SetReturnValue(args, list);
+  } else {
+    Dart_SetReturnValue(args, DartUtils::NewDartOSError(os_error));
+    delete os_error;
+  }
+}
+
 void FUNCTION_NAME(InternetAddress_RawAddrToString)(Dart_NativeArguments args) {
   RawAddr addr;
   SocketAddress::GetSockAddr(Dart_GetNativeArgument(args, 0), &addr);

sdk/lib/_internal/vm/bin/socket_patch.dart

@@ -226,14 +226,36 @@ class _InternetAddress implements InternetAddress {
       return _InternetAddress(
           InternetAddressType.unix, address, null, rawAddress);
     } else {
-      var in_addr = _parse(address);
-      if (in_addr == null) {
-        throw ArgumentError("Invalid internet address $address");
+      int index = address.indexOf('%');
+      String originalAddress = address;
+      String? scopeID;
+      if (index > 0) {
+        scopeID = address.substring(index, address.length);
+        address = address.substring(0, index);
       }
-      InternetAddressType type = in_addr.length == _IPv4AddrLength
+      var inAddr = _parse(address);
+      if (inAddr == null) {
+        throw ArgumentError.value("Invalid internet address $address");
+      }
+      InternetAddressType type = inAddr.length == _IPv4AddrLength
           ? InternetAddressType.IPv4
           : InternetAddressType.IPv6;
-      return _InternetAddress(type, address, null, in_addr);
+      if (scopeID != null && scopeID.length > 0) {
+        if (type != InternetAddressType.IPv6) {
+          throw ArgumentError.value("IPv4 addresses cannot have a scope id");
+        }
+        // This is an IPv6 address with scope id.
+        var list = _parseScopedLinkLocalAddress(originalAddress);
+
+        if (list is! OSError && (list as List).isNotEmpty) {
+          return _InternetAddress(InternetAddressType.IPv6, originalAddress,
+              null, inAddr, list.first);
+        } else {
+          throw ArgumentError.value(
+              "Invalid IPv6 address $address with scope ID");
+        }
+      }
+      return _InternetAddress(type, originalAddress, null, inAddr, 0);
     }
   }
 
@@ -262,12 +284,11 @@ class _InternetAddress implements InternetAddress {
 
   static _InternetAddress? tryParse(String address) {
     checkNotNullable(address, "address");
-    var addressBytes = _parse(address);
-    if (addressBytes == null) return null;
-    var type = addressBytes.length == _IPv4AddrLength
-        ? InternetAddressType.IPv4
-        : InternetAddressType.IPv6;
-    return _InternetAddress(type, address, null, addressBytes);
+    try {
+      return _InternetAddress.fromString(address);
+    } catch (e) {
+      return null;
+    }
   }
 
   factory _InternetAddress.fixed(int id) {
@@ -297,7 +318,8 @@ class _InternetAddress implements InternetAddress {
 
   // Create a clone of this _InternetAddress replacing the host.
   _InternetAddress _cloneWithNewHost(String host) {
-    return _InternetAddress(type, address, host, Uint8List.fromList(_in_addr));
+    return _InternetAddress(
+        type, address, host, Uint8List.fromList(_in_addr), _scope_id);
   }
 
   bool operator ==(other) {
@@ -330,7 +352,8 @@ class _InternetAddress implements InternetAddress {
 
   static String _rawAddrToString(Uint8List address)
       native "InternetAddress_RawAddrToString";
-
+  static List _parseScopedLinkLocalAddress(String address)
+      native "InternetAddress_ParseScopedLinkLocalAddress";
   static Uint8List? _parse(String address) native "InternetAddress_Parse";
 }
 

tests/standalone/io/http_linklocal_ipv6_test.dart

@@ -16,8 +16,13 @@ void main() {
   //    ip address show
   asyncStart();
   try {
-    // Make sure the address here is the same as what it shows in "ip address show"
-    var ipv6 = 'fe80:1::10%tap0';
+    // Make sure the address here is the same as what it shows in
+    // "ip address show"
+    var ipv6 = 'fe80:1::1%tap0';
+
+    // Parses a Link-local address on Linux and Windows will throw an exception.
+    InternetAddress(ipv6);
+
     HttpServer.bind(ipv6, 0).then((server) {
       server.listen((request) {
         var timer = new Timer.periodic(const Duration(milliseconds: 0), (_) {

tests/standalone_2/io/http_linklocal_ipv6_test.dart

@@ -16,8 +16,13 @@ void main() {
   //    ip address show
   asyncStart();
   try {
-    // Make sure the address here is the same as what it shows in "ip address show"
-    var ipv6 = 'fe80:1::10%tap0';
+    // Make sure the address here is the same as what it shows in
+    // "ip address show"
+    var ipv6 = 'fe80:1::1%tap0';
+
+    // Parses a Link-local address on Linux and Windows will throw an exception.
+    InternetAddress(ipv6);
+
     HttpServer.bind(ipv6, 0).then((server) {
       server.listen((request) {
         var timer = new Timer.periodic(const Duration(milliseconds: 0), (_) {