Add MockedBroadcastingEchoServer fuzz target

fuzzing/Makefile

@@ -14,6 +14,7 @@ oss-fuzz:
 	$(CC) $(CFLAGS) -DLIBUS_NO_SSL -c -O3 uSocketsMock.c
 	$(CXX) $(CXXFLAGS) -std=c++17 -O3 -DLIBUS_NO_SSL -I../src -I../uSockets/src MockedHelloWorld.cpp uSocketsMock.o -lz -o $(OUT)/MockedHelloWorld $(LIB_FUZZING_ENGINE)
 	$(CXX) $(CXXFLAGS) -std=c++17 -O3 -DLIBUS_NO_SSL -I../src -I../uSockets/src MockedEchoServer.cpp uSocketsMock.o -lz -o $(OUT)/MockedEchoServer $(LIB_FUZZING_ENGINE)
+	$(CXX) $(CXXFLAGS) -std=c++17 -O3 -DLIBUS_NO_SSL -I../src -I../uSockets/src MockedBroadcastingEchoServer.cpp uSocketsMock.o -lz -o $(OUT)/MockedBroadcastingEchoServer $(LIB_FUZZING_ENGINE)
 
 broken:
 # Too small tests, failing coverage test

fuzzing/MockedBroadcastingEchoServer.cpp

@@ -0,0 +1,71 @@
+#include "App.h"
+
+#include "helpers.h"
+
+/* This function pushes data to the uSockets mock */
+extern "C" void us_loop_read_mocked_data(struct us_loop *loop, char *data, unsigned int size);
+
+uWS::TemplatedApp<false> *app;
+us_listen_socket_t *listenSocket;
+
+extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) {
+
+    /* ws->getUserData returns one of these */
+    struct PerSocketData {
+        int nothing;
+    };
+
+    /* Very simple WebSocket echo server */
+    app = new uWS::TemplatedApp<false>(uWS::App().ws<PerSocketData>("/*", {
+        /* Settings */
+        .compression = uWS::SHARED_COMPRESSOR,
+        /* We want this to be low so that we can hit it, yet bigger than 256 */
+        .maxPayloadLength = 300,
+        .idleTimeout = 10,
+        /* Handlers */
+        .open = [](auto *ws, auto *req) {
+                /* Subscribe to anything */
+                ws->subscribe(req->getHeader("topic"));
+        },
+        .message = [](auto *ws, std::string_view message, uWS::OpCode opCode) {
+            if (message.length() && message[0] == 'C') {
+                ws->close();
+            } else if (message.length() && message[0] == 'E') {
+                ws->end(1006);
+            } else {
+                /* Publish to topic sent by message */
+                ws->publish(message, message, opCode, true);
+
+                if (message.length() && message[0] == 'U') {
+                   ws->unsubscribe(message);
+                }
+            }
+        },
+        .drain = [](auto *ws) {
+            /* Check getBufferedAmount here */
+        },
+        .ping = [](auto *ws) {
+
+        },
+        .pong = [](auto *ws) {
+
+        },
+        .close = [](auto *ws, int code, std::string_view message) {
+
+        }
+    }).listen(9001, [](us_listen_socket_t *listenSocket) {
+        if (listenSocket) {
+            std::cout << "Listening on port " << 9001 << std::endl;
+            ::listenSocket = listenSocket;
+        }
+    }));
+
+    return 0;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+
+    us_loop_read_mocked_data((struct us_loop *) uWS::Loop::get(), (char *) makePadded(data, size), size);
+
+    return 0;
+}