test/core/end2end/fuzzers/server_fuzzer.cc

   1 /*
   2  *
   3  * Copyright 2016 gRPC authors.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  *
  17  */
  18
  19 #include <grpc/grpc.h>
  20
  21 #include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
  22 #include "src/core/lib/iomgr/executor.h"
  23 #include "src/core/lib/slice/slice_internal.h"
  24 #include "src/core/lib/surface/server.h"
  25 #include "test/core/util/mock_endpoint.h"
  26
  27 bool squelch = true;
  28 bool leak_check = true;
  29
  30 static void discard_write(grpc_slice /*slice*/) {}
  31
  32 static void* tag(int n) { return (void*)static_cast<uintptr_t>(n); }
  33 static int detag(void* p) { return static_cast<int>((uintptr_t)p); }
  34
  35 static void dont_log(gpr_log_func_args* /*args*/) {}
  36
  37 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  38   grpc_test_only_set_slice_hash_seed(0);
  39   if (squelch) gpr_set_log_function(dont_log);
  40   grpc_init();
  41   {
  42     grpc_core::ExecCtx exec_ctx;
  43     grpc_core::Executor::SetThreadingAll(false);
  44
  45     grpc_resource_quota* resource_quota =
  46         grpc_resource_quota_create("server_fuzzer");
  47     grpc_endpoint* mock_endpoint =
  48         grpc_mock_endpoint_create(discard_write, resource_quota);
  49     grpc_resource_quota_unref_internal(resource_quota);
  50     grpc_mock_endpoint_put_read(
  51         mock_endpoint, grpc_slice_from_copied_buffer((const char*)data, size));
  52
  53     grpc_server* server = grpc_server_create(nullptr, nullptr);
  54     grpc_completion_queue* cq = grpc_completion_queue_create_for_next(nullptr);
  55     grpc_server_register_completion_queue(server, cq, nullptr);
  56     // TODO(ctiller): add more registered methods (one for POST, one for PUT)
  57     grpc_server_register_method(server, "/reg", nullptr, {}, 0);
  58     grpc_server_start(server);
  59     grpc_transport* transport =
  60         grpc_create_chttp2_transport(nullptr, mock_endpoint, false);
  61     server->core_server->SetupTransport(transport, nullptr, nullptr, nullptr);
  62     grpc_chttp2_transport_start_reading(transport, nullptr, nullptr);
  63
  64     grpc_call* call1 = nullptr;
  65     grpc_call_details call_details1;
  66     grpc_metadata_array request_metadata1;
  67     grpc_call_details_init(&call_details1);
  68     grpc_metadata_array_init(&request_metadata1);
  69     int requested_calls = 0;
  70
  71     GPR_ASSERT(GRPC_CALL_OK ==
  72                grpc_server_request_call(server, &call1, &call_details1,
  73                                         &request_metadata1, cq, cq, tag(1)));
  74     requested_calls++;
  75
  76     grpc_event ev;
  77     while (true) {
  78       grpc_core::ExecCtx::Get()->Flush();
  79       ev = grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME),
  80                                       nullptr);
  81       switch (ev.type) {
  82         case GRPC_QUEUE_TIMEOUT:
  83           goto done;
  84         case GRPC_QUEUE_SHUTDOWN:
  85           break;
  86         case GRPC_OP_COMPLETE:
  87           switch (detag(ev.tag)) {
  88             case 1:
  89               requested_calls--;
  90               // TODO(ctiller): keep reading that call!
  91               break;
  92           }
  93       }
  94     }
  95
  96   done:
  97     if (call1 != nullptr) grpc_call_unref(call1);
  98     grpc_call_details_destroy(&call_details1);
  99     grpc_metadata_array_destroy(&request_metadata1);
 100     grpc_server_shutdown_and_notify(server, cq, tag(0xdead));
 101     grpc_server_cancel_all_calls(server);
 102     grpc_millis deadline = grpc_core::ExecCtx::Get()->Now() + 5000;
 103     for (int i = 0; i <= requested_calls; i++) {
 104       // A single grpc_completion_queue_next might not be sufficient for getting
 105       // the tag from shutdown, because we might potentially get blocked by
 106       // an operation happening on the timer thread.
 107       // For example, the deadline timer might expire, leading to the timer
 108       // thread trying to cancel the RPC and thereby acquiring a few references
 109       // to the call. This will prevent the shutdown to complete till the timer
 110       // thread releases those references.
 111       // As a solution, we are going to keep performing a cq_next for a
 112       // liberal period of 5 seconds for the timer thread to complete its work.
 113       do {
 114         ev = grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME),
 115                                         nullptr);
 116         grpc_core::ExecCtx::Get()->InvalidateNow();
 117       } while (ev.type != GRPC_OP_COMPLETE &&
 118                grpc_core::ExecCtx::Get()->Now() < deadline);
 119       GPR_ASSERT(ev.type == GRPC_OP_COMPLETE);
 120     }
 121     grpc_completion_queue_shutdown(cq);
 122     for (int i = 0; i <= requested_calls; i++) {
 123       do {
 124         ev = grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME),
 125                                         nullptr);
 126         grpc_core::ExecCtx::Get()->InvalidateNow();
 127       } while (ev.type != GRPC_QUEUE_SHUTDOWN &&
 128                grpc_core::ExecCtx::Get()->Now() < deadline);
 129       GPR_ASSERT(ev.type == GRPC_QUEUE_SHUTDOWN);
 130     }
 131     grpc_server_destroy(server);
 132     grpc_completion_queue_destroy(cq);
 133   }
 134   grpc_shutdown();
 135   return 0;
 136 }