test: read proper inspector message size

Fix a bug when messages bigger than 64kb where incorrectly parsed by the inspector-helper. PR-URL: nodejs#14596 Fixes: nodejs#14507 Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Eugene Ostroukhov <[email protected]> Reviewed-By: Refael Ackermann <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: James M Snell <[email protected]>
Trott · Aug 4, 2017 · 2dc09f6 · 2dc09f6
1 parent 211df3f
commit 2dc09f6
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/test/inspector/inspector-helper.js b/test/inspector/inspector-helper.js
@@ -53,6 +53,7 @@ function sendEnd(socket) {
 }
 
 function parseWSFrame(buffer, handler) {
+  // Protocol described in https://tools.ietf.org/html/rfc6455#section-5
   if (buffer.length < 2)
     return 0;
   if (buffer[0] === 0x88 && buffer[1] === 0x00) {
@@ -68,7 +69,8 @@ function parseWSFrame(buffer, handler) {
     dataLen = buffer.readUInt16BE(2);
     bodyOffset = 4;
   } else if (dataLen === 127) {
-    dataLen = buffer.readUInt32BE(2);
+    assert(buffer[2] === 0 && buffer[3] === 0, 'Inspector message too big');
+    dataLen = buffer.readUIntBE(4, 6);
     bodyOffset = 10;
   }
   if (buffer.length < bodyOffset + dataLen)