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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_NET_PROBE_MESSAGE_H_
#define CHROME_BROWSER_NET_PROBE_MESSAGE_H_
#include <stdint.h>
#include <array>
#include <string>
#include "base/gtest_prod_util.h"
#include "chrome/browser/net/probe_message.pb.h"
namespace chrome_browser_net {
// Packet format between client and server is defined in probe_message.proto.
class ProbeMessage {
public:
ProbeMessage();
ProbeMessage(const ProbeMessage&) = delete;
ProbeMessage& operator=(const ProbeMessage&) = delete;
// Generate a ProbeRequest packet.
void GenerateProbeRequest(const ProbePacket_Token& received_token,
uint32_t group_id,
uint32_t probe_size,
uint32_t pacing_interval_micros,
uint32_t number_probe_packets,
ProbePacket* output);
// Make an encoded packet (string) from a ProbePacket object.
std::string MakeEncodedPacket(const ProbePacket& packet) const;
// Fill some common fields in the packet header.
void SetPacketHeader(ProbePacket_Type packet_type,
ProbePacket* probe_packet) const;
// Parse the input string (which is an encoded packet) and save the result to
// packet. Return true if there is no error and false otherwise.
bool ParseInput(const std::string& input, ProbePacket* packet) const;
static constexpr uint32_t kMaxProbePacketBytes = 1500;
private:
// For unittest.
friend class ProbeMessageTest;
FRIEND_TEST_ALL_PREFIXES(ProbeMessageTest, TestChecksum);
FRIEND_TEST_ALL_PREFIXES(ProbeMessageTest, TestEncode);
FRIEND_TEST_ALL_PREFIXES(ProbeMessageTest, TestGenerateProbeRequest);
FRIEND_TEST_ALL_PREFIXES(ProbeMessageTest, TestSetPacketHeader);
// Compute the checksum of the padding string.
uint32_t Checksum(const std::string& str) const;
// Encode the packet with kEncodingString. This is also used for decoding.
std::string Encode(const std::string& input) const;
static constexpr uint32_t kVersion = 2;
static constexpr uint32_t kMaxNumberProbePackets = 21;
// Maximum pacing interval is 300 seconds (for testing NAT binding).
static constexpr uint32_t kMaxPacingIntervalMicros = 300000000;
static constexpr auto kEncodingString = std::to_array<const uint8_t>({
'T', 0xd3, '?', 0xa5, 'h', '2', 0x9c, 0x8e, 'n', 0xf1, 'Q', '6',
0xbc, '{', 0xc6, '-', '4', 0xfa, '$', 'f', 0xb9, '[', 0xa6, 0xcd,
'@', '6', ',', 0xdf, 0xb3, 'i', '-', 0xe6, 'v', 0x9e, 'V', 0x8d,
'X', 'd', 0xd9, 'k', 'E', 0xf6, '=', 0xbe, 'O',
});
};
} // namespace chrome_browser_net
#endif // CHROME_BROWSER_NET_PROBE_MESSAGE_H_
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