fuzz: added fuzz test for listener filter original_dst

test/extensions/filters/listener/original_dst/BUILD

@@ -1,6 +1,8 @@
 load(
     "//bazel:envoy_build_system.bzl",
+    "envoy_cc_fuzz_test",
     "envoy_package",
+    "envoy_proto_library",
 )
 load(
     "//test/extensions:extensions_build_system.bzl",
@@ -20,3 +22,23 @@ envoy_extension_cc_test(
         "//test/test_common:utility_lib",
     ],
 )
+
+envoy_proto_library(
+    name = "original_dst_fuzz_test_proto",
+    srcs = ["original_dst_fuzz_test.proto"],
+    deps = [
+        "@envoy_api//envoy/extensions/filters/listener/original_dst/v3:pkg",
+    ],
+)
+
+envoy_cc_fuzz_test(
+    name = "original_dst_fuzz_test",
+    srcs = ["original_dst_fuzz_test.cc"],
+    corpus = "original_dst_corpus",
+    deps = [
+        ":original_dst_fuzz_test_proto_cc_proto",
+        "//source/extensions/filters/listener/original_dst:original_dst_lib",
+        "//test/mocks/network:network_mocks",
+        "@envoy_api//envoy/extensions/filters/listener/original_dst/v3:pkg_cc_proto",
+    ],
+)

test/extensions/filters/listener/original_dst/original_dst_fuzz_test.cc

@@ -0,0 +1,69 @@
+#include "envoy/extensions/filters/listener/original_dst/v3/original_dst.pb.h"
+
+#include "common/network/utility.h"
+
+#include "extensions/filters/listener/original_dst/original_dst.h"
+
+#include "test/extensions/filters/listener/original_dst/original_dst_fuzz_test.pb.validate.h"
+#include "test/fuzz/fuzz_runner.h"
+#include "test/mocks/network/mocks.h"
+
+#include "gmock/gmock.h"
+
+namespace Envoy {
+namespace Extensions {
+namespace ListenerFilters {
+namespace OriginalDst {
+
+DEFINE_PROTO_FUZZER(
+    const envoy::extensions::filters::listener::original_dst::v3::OriginalDstTestCase& input) {
+
+  try {
+    TestUtility::validate(input);
+  } catch (const ProtoValidationException& e) {
+    ENVOY_LOG_MISC(debug, "ProtoValidationException: {}", e.what());
+    return;
+  }
+
+  NiceMock<Network::MockListenerFilterCallbacks> callbacks_;
+  NiceMock<Network::MockConnectionSocket> socket_;
+
+  try {
+    auto address_ = Network::Utility::resolveUrl(input.address());
+    ON_CALL(socket_, localAddress()).WillByDefault(testing::ReturnRef(address_));
+    ON_CALL(callbacks_, socket()).WillByDefault(testing::ReturnRef(socket_));
+    if (address_ != nullptr)
+      ON_CALL(socket_, addressType()).WillByDefault(testing::Return(address_->type()));
+    if (socket_.addressType() == Network::Address::Type::Ip)
+      ON_CALL(socket_, ipVersion()).WillByDefault(testing::Return(address_->ip()->version()));
+
+    auto filter = std::make_unique<OriginalDstFilter>();
+
+    // Set address family of mock socket so that it routes correctly thru addressFromSockAddr
+    ON_CALL(socket_, getSocketOption(_, _, _, _))
+        .WillByDefault(testing::WithArgs<0, 2>(Invoke([](int level, void *optval) {
+      switch (level) {
+        case SOL_IPV6:
+          static_cast<sockaddr_storage*>(optval)->ss_family = AF_INET6;
+          break;
+        case SOL_IP:
+          static_cast<sockaddr_storage*>(optval)->ss_family = AF_INET;
+          break;
+        default:
+          NOT_REACHED_GCOVR_EXCL_LINE;
+      }
+
+      return Api::SysCallIntResult{0, 0};
+    })));
+
+    filter->onAccept(callbacks_);
+  } catch(const EnvoyException& e) {
+    ENVOY_LOG_MISC(debug, "EnvoyException: {}", e.what());
+    return;
+  }
+}
+
+} // namespace OriginalDst
+} // namespace ListenerFilters
+} // namespace Extensions
+} // namespace Envoy

test/extensions/filters/listener/original_dst/original_dst_fuzz_test.proto

@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+package envoy.extensions.filters.listener.original_dst.v3;
+
+import "envoy/extensions/filters/listener/original_dst/v3/original_dst.proto";
+import "google/protobuf/empty.proto";
+import "validate/validate.proto";
+
+message OriginalDstTestCase {
+  envoy.extensions.filters.listener.original_dst.v3.OriginalDst config = 1;
+  string address = 2;
+}