1 files changed, 157 insertions, 0 deletions
diff --git a/test/core/end2end/fuzzers/client_fuzzer.cc b/test/core/end2end/fuzzers/client_fuzzer.cc
new file mode 100644
index 0000000000..d90ec40a27
--- /dev/null
+++ b/test/core/end2end/fuzzers/client_fuzzer.cc
@@ -0,0 +1,157 @@
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <string.h>
+
+#include <grpc/grpc.h>
+#include <grpc/support/alloc.h>
+
+#include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
+#include "src/core/lib/iomgr/executor.h"
+#include "src/core/lib/slice/slice_internal.h"
+#include "src/core/lib/surface/channel.h"
+#include "test/core/util/memory_counters.h"
+#include "test/core/util/mock_endpoint.h"
+
+bool squelch = true;
+bool leak_check = true;
+
+static void discard_write(grpc_slice slice) {}
+
+static void* tag(int n) { return (void*)(uintptr_t)n; }
+
+static void dont_log(gpr_log_func_args* args) {}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  grpc_test_only_set_slice_hash_seed(0);
+  struct grpc_memory_counters counters;
+  if (squelch) gpr_set_log_function(dont_log);
+  if (leak_check) grpc_memory_counters_init();
+  grpc_init();
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_executor_set_threading(&exec_ctx, false);
+
+  grpc_resource_quota* resource_quota =
+      grpc_resource_quota_create("client_fuzzer");
+  grpc_endpoint* mock_endpoint =
+      grpc_mock_endpoint_create(discard_write, resource_quota);
+  grpc_resource_quota_unref_internal(&exec_ctx, resource_quota);
+
+  grpc_completion_queue* cq = grpc_completion_queue_create_for_next(NULL);
+  grpc_transport* transport =
+      grpc_create_chttp2_transport(&exec_ctx, NULL, mock_endpoint, 1);
+  grpc_chttp2_transport_start_reading(&exec_ctx, transport, NULL);
+
+  grpc_channel* channel = grpc_channel_create(
+      &exec_ctx, "test-target", NULL, GRPC_CLIENT_DIRECT_CHANNEL, transport);
+  grpc_slice host = grpc_slice_from_static_string("localhost");
+  grpc_call* call = grpc_channel_create_call(
+      channel, NULL, 0, cq, grpc_slice_from_static_string("/foo"), &host,
+      gpr_inf_future(GPR_CLOCK_REALTIME), NULL);
+
+  grpc_metadata_array initial_metadata_recv;
+  grpc_metadata_array_init(&initial_metadata_recv);
+  grpc_byte_buffer* response_payload_recv = NULL;
+  grpc_metadata_array trailing_metadata_recv;
+  grpc_metadata_array_init(&trailing_metadata_recv);
+  grpc_status_code status;
+  grpc_slice details = grpc_empty_slice();
+
+  grpc_op ops[6];
+  memset(ops, 0, sizeof(ops));
+  grpc_op* op = ops;
+  op->op = GRPC_OP_SEND_INITIAL_METADATA;
+  op->data.send_initial_metadata.count = 0;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_RECV_INITIAL_METADATA;
+  op->data.recv_initial_metadata.recv_initial_metadata = &initial_metadata_recv;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_RECV_MESSAGE;
+  op->data.recv_message.recv_message = &response_payload_recv;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
+  op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv;
+  op->data.recv_status_on_client.status = &status;
+  op->data.recv_status_on_client.status_details = &details;
+  op->flags = 0;
+  op->reserved = NULL;
+  op++;
+  grpc_call_error error =
+      grpc_call_start_batch(call, ops, (size_t)(op - ops), tag(1), NULL);
+  int requested_calls = 1;
+  GPR_ASSERT(GRPC_CALL_OK == error);
+
+  grpc_mock_endpoint_put_read(
+      &exec_ctx, mock_endpoint,
+      grpc_slice_from_copied_buffer((const char*)data, size));
+
+  grpc_event ev;
+  while (1) {
+    grpc_exec_ctx_flush(&exec_ctx);
+    ev = grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
+    switch (ev.type) {
+      case GRPC_QUEUE_TIMEOUT:
+        goto done;
+      case GRPC_QUEUE_SHUTDOWN:
+        break;
+      case GRPC_OP_COMPLETE:
+        requested_calls--;
+        break;
+    }
+  }
+
+done:
+  if (requested_calls) {
+    grpc_call_cancel(call, NULL);
+  }
+  for (int i = 0; i < requested_calls; i++) {
+    ev = grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
+    GPR_ASSERT(ev.type == GRPC_OP_COMPLETE);
+  }
+  grpc_completion_queue_shutdown(cq);
+  for (int i = 0; i < requested_calls; i++) {
+    ev = grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
+    GPR_ASSERT(ev.type == GRPC_QUEUE_SHUTDOWN);
+  }
+  grpc_call_unref(call);
+  grpc_completion_queue_destroy(cq);
+  grpc_metadata_array_destroy(&initial_metadata_recv);
+  grpc_metadata_array_destroy(&trailing_metadata_recv);
+  grpc_slice_unref(details);
+  grpc_channel_destroy(channel);
+  if (response_payload_recv != NULL) {
+    grpc_byte_buffer_destroy(response_payload_recv);
+  }
+  grpc_shutdown();
+  if (leak_check) {
+    counters = grpc_memory_counters_snapshot();
+    grpc_memory_counters_destroy();
+    GPR_ASSERT(counters.total_size_relative == 0);
+  }
+  return 0;
+}