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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/security_key/security_key_message.h"
#include <cstdint>
#include <memory>
#include <string>
#include <utility>
#include "base/functional/callback.h"
#include "base/logging.h"
namespace {
// Limit security key messages to 256KB.
const uint32_t kMaxSecurityKeyMessageByteCount = 256 * 1024;
} // namespace
namespace remoting {
const int SecurityKeyMessage::kHeaderSizeBytes = 4;
const int SecurityKeyMessage::kMessageTypeSizeBytes = 1;
SecurityKeyMessage::SecurityKeyMessage() = default;
SecurityKeyMessage::~SecurityKeyMessage() = default;
bool SecurityKeyMessage::IsValidMessageSize(uint32_t message_size) {
return message_size > 0 && message_size <= kMaxSecurityKeyMessageByteCount;
}
SecurityKeyMessageType SecurityKeyMessage::MessageTypeFromValue(int value) {
// Note: The static_cast from enum value to int should be safe since the enum
// type is an unsigned 8bit value.
switch (value) {
case static_cast<int>(SecurityKeyMessageType::CONNECT):
case static_cast<int>(SecurityKeyMessageType::CONNECT_RESPONSE):
case static_cast<int>(SecurityKeyMessageType::CONNECT_ERROR):
case static_cast<int>(SecurityKeyMessageType::REQUEST):
case static_cast<int>(SecurityKeyMessageType::REQUEST_RESPONSE):
case static_cast<int>(SecurityKeyMessageType::REQUEST_ERROR):
case static_cast<int>(SecurityKeyMessageType::UNKNOWN_COMMAND):
case static_cast<int>(SecurityKeyMessageType::UNKNOWN_ERROR):
case static_cast<int>(SecurityKeyMessageType::INVALID):
return static_cast<SecurityKeyMessageType>(value);
default:
LOG(ERROR) << "Unknown message type passed in: " << value;
return SecurityKeyMessageType::INVALID;
}
}
std::unique_ptr<SecurityKeyMessage> SecurityKeyMessage::CreateMessageForTest(
SecurityKeyMessageType type,
const std::string& payload) {
std::unique_ptr<SecurityKeyMessage> message(new SecurityKeyMessage());
message->type_ = type;
message->payload_ = payload;
return message;
}
bool SecurityKeyMessage::ParseMessage(const std::string& message_data) {
if (!IsValidMessageSize(message_data.size())) {
return false;
}
// The first char of the message is the message type.
type_ = MessageTypeFromValue(message_data[0]);
if (type_ == SecurityKeyMessageType::INVALID) {
return false;
}
payload_.clear();
if (message_data.size() > kMessageTypeSizeBytes) {
payload_ = message_data.substr(1);
}
return true;
}
} // namespace remoting
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