win: Crash handler server

util/win/registration_protocol_win.cc

+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// 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 "util/win/registration_protocol_win.h"
+
+#include <windows.h>
+
+#include "base/logging.h"
+
+namespace crashpad {
+
+bool SendToCrashHandlerServer(const base::string16& pipe_name,
+                              const crashpad::ClientToServerMessage& message,
+                              crashpad::ServerToClientMessage* response) {
+  int tries = 5;
+  while (tries > 0) {
+    HANDLE pipe = CreateFile(pipe_name.c_str(),
+                             GENERIC_READ | GENERIC_WRITE,
+                             0,
+                             nullptr,
+                             OPEN_EXISTING,
+                             SECURITY_SQOS_PRESENT | SECURITY_IDENTIFICATION,
+                             nullptr);
+    if (pipe == INVALID_HANDLE_VALUE) {
+      Sleep(10);
+      --tries;
+      continue;
+    }
+    DWORD mode = PIPE_READMODE_MESSAGE;
+    if (!SetNamedPipeHandleState(pipe, &mode, nullptr, nullptr)) {
+      PLOG(ERROR) << "SetNamedPipeHandleState";
+      return false;
+    }
+    DWORD bytes_read = 0;
+    BOOL result = TransactNamedPipe(
+        pipe,
+        // This is [in], but is incorrectly declared non-const.
+        const_cast<crashpad::ClientToServerMessage*>(&message),
+        sizeof(message),
+        response,
+        sizeof(*response),
+        &bytes_read,
+        nullptr);
+    if (!result) {
+      PLOG(ERROR) << "TransactNamedPipe";
+      return false;
+    }
+    if (bytes_read != sizeof(*response)) {
+      LOG(ERROR) << "TransactNamedPipe read incorrect number of bytes";
+      return false;
+    }
+    return true;
+  }
+
+  LOG(ERROR) << "failed to connect after retrying";
+  return false;
+}
+
+}  // namespace crashpad