// Copyright (c) 2012 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "ipc/ipc_channel.h" #include #include #include #include "base/atomic_sequence_num.h" #include "base/rand_util.h" #include "base/strings/stringprintf.h" #include "build/build_config.h" namespace { // Global atomic used to guarantee channel IDs are unique. base::AtomicSequenceNumber g_last_id; } // namespace namespace IPC { // static constexpr size_t Channel::kMaximumMessageSize; // static std::string Channel::GenerateUniqueRandomChannelID() { // Note: the string must start with the current process id, this is how // some child processes determine the pid of the parent. // // This is composed of a unique incremental identifier, the process ID of // the creator, an identifier for the child instance, and a strong random // component. The strong random component prevents other processes from // hijacking or squatting on predictable channel names. int process_id = base::GetCurrentProcId(); return base::StringPrintf("%d.%u.%d", process_id, g_last_id.GetNext(), base::RandInt(0, std::numeric_limits::max())); } } // namespace IPC