blob: c850fec996a6ce5c747d62b39ff2ed60d478519d [file] [log] [blame]
/*
* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <algorithm>
#include "modules/rtp_rtcp/include/ulpfec_receiver.h"
#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
#include "modules/rtp_rtcp/source/byte_io.h"
#include "modules/rtp_rtcp/source/rtp_packet_received.h"
#include "rtc_base/basictypes.h"
namespace webrtc {
namespace {
class DummyCallback : public RecoveredPacketReceiver {
void OnRecoveredPacket(const uint8_t* packet, size_t length) override {}
};
} // namespace
void FuzzOneInput(const uint8_t* data, size_t size) {
constexpr size_t kMinDataNeeded = 12;
if (size < kMinDataNeeded) {
return;
}
uint32_t ulpfec_ssrc = ByteReader<uint32_t>::ReadLittleEndian(data + 0);
uint16_t ulpfec_seq_num = ByteReader<uint16_t>::ReadLittleEndian(data + 4);
uint32_t media_ssrc = ByteReader<uint32_t>::ReadLittleEndian(data + 6);
uint16_t media_seq_num = ByteReader<uint16_t>::ReadLittleEndian(data + 10);
DummyCallback callback;
std::unique_ptr<UlpfecReceiver> receiver(
UlpfecReceiver::Create(ulpfec_ssrc, &callback));
std::unique_ptr<uint8_t[]> packet;
size_t packet_length;
size_t i = kMinDataNeeded;
while (i < size) {
packet_length = kRtpHeaderSize + data[i++];
packet = std::unique_ptr<uint8_t[]>(new uint8_t[packet_length]);
if (i + packet_length >= size) {
break;
}
memcpy(packet.get(), data + i, packet_length);
i += packet_length;
// Overwrite the RTPHeader fields for the sequence number and SSRC with
// consistent values for either a received UlpFEC packet or received media
// packet. (We're still relying on libfuzzer to manage to generate packet
// headers that interact together; this just ensures that we have two
// consistent streams).
if (i < size && data[i++] % 2 == 0) {
// Simulate UlpFEC packet.
ByteWriter<uint16_t>::WriteBigEndian(packet.get() + 2, ulpfec_seq_num++);
ByteWriter<uint32_t>::WriteBigEndian(packet.get() + 8, ulpfec_ssrc);
} else {
// Simulate media packet.
ByteWriter<uint16_t>::WriteBigEndian(packet.get() + 2, media_seq_num++);
ByteWriter<uint32_t>::WriteBigEndian(packet.get() + 8, media_ssrc);
}
RtpPacketReceived parsed_packet;
RTPHeader parsed_header;
if (parsed_packet.Parse(packet.get(), packet_length)) {
parsed_packet.GetHeader(&parsed_header);
receiver->AddReceivedRedPacket(parsed_header, packet.get(),
packet_length, 0);
}
}
receiver->ProcessReceivedFec();
}
} // namespace webrtc