blob: 9e8fd6f4c163695e85d77f1cc85b92d983785910 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/*
* Copyright (c) 2016 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 <bitset>
#include "absl/types/optional.h"
#include "modules/rtp_rtcp/include/rtp_header_extension_map.h"
#include "modules/rtp_rtcp/source/rtp_generic_frame_descriptor_extension.h"
#include "modules/rtp_rtcp/source/rtp_header_extensions.h"
#include "modules/rtp_rtcp/source/rtp_packet_received.h"
#include "modules/rtp_rtcp/source/rtp_video_layers_allocation_extension.h"
namespace webrtc {
// We decide which header extensions to register by reading four bytes
// from the beginning of |data| and interpreting it as a bitmask over
// the RTPExtensionType enum. This assert ensures four bytes are enough.
static_assert(kRtpExtensionNumberOfExtensions <= 32,
"Insufficient bits read to configure all header extensions. Add "
"an extra byte and update the switches.");
void FuzzOneInput(const uint8_t* data, size_t size) {
if (size <= 4)
return;
// Don't use the configuration byte as part of the packet.
std::bitset<32> extensionMask(*reinterpret_cast<const uint32_t*>(data));
data += 4;
size -= 4;
RtpPacketReceived::ExtensionManager extensions(/*extmap_allow_mixed=*/true);
// Start at local_id = 1 since 0 is an invalid extension id.
int local_id = 1;
// Skip i = 0 since it maps to kRtpExtensionNone.
for (int i = 1; i < kRtpExtensionNumberOfExtensions; i++) {
RTPExtensionType extension_type = static_cast<RTPExtensionType>(i);
if (extensionMask[i]) {
// Extensions are registered with an ID, which you signal to the
// peer so they know what to expect. This code only cares about
// parsing so the value of the ID isn't relevant.
extensions.RegisterByType(local_id++, extension_type);
}
}
RtpPacketReceived packet(&extensions);
packet.Parse(data, size);
// Call packet accessors because they have extra checks.
packet.Marker();
packet.PayloadType();
packet.SequenceNumber();
packet.Timestamp();
packet.Ssrc();
packet.Csrcs();
// Each extension has its own getter. It is supported behaviour to
// call GetExtension on an extension which was not registered, so we
// don't check the bitmask here.
for (int i = 0; i < kRtpExtensionNumberOfExtensions; i++) {
switch (static_cast<RTPExtensionType>(i)) {
case kRtpExtensionNone:
case kRtpExtensionNumberOfExtensions:
break;
case kRtpExtensionTransmissionTimeOffset:
int32_t offset;
packet.GetExtension<TransmissionOffset>(&offset);
break;
case kRtpExtensionAudioLevel:
bool voice_activity;
uint8_t audio_level;
packet.GetExtension<AudioLevel>(&voice_activity, &audio_level);
break;
case kRtpExtensionAbsoluteSendTime:
uint32_t sendtime;
packet.GetExtension<AbsoluteSendTime>(&sendtime);
break;
case kRtpExtensionAbsoluteCaptureTime: {
AbsoluteCaptureTime extension;
packet.GetExtension<AbsoluteCaptureTimeExtension>(&extension);
break;
}
case kRtpExtensionVideoRotation:
uint8_t rotation;
packet.GetExtension<VideoOrientation>(&rotation);
break;
case kRtpExtensionTransportSequenceNumber:
uint16_t seqnum;
packet.GetExtension<TransportSequenceNumber>(&seqnum);
break;
case kRtpExtensionTransportSequenceNumber02: {
uint16_t seqnum;
absl::optional<FeedbackRequest> feedback_request;
packet.GetExtension<TransportSequenceNumberV2>(&seqnum,
&feedback_request);
break;
}
case kRtpExtensionPlayoutDelay: {
VideoPlayoutDelay playout;
packet.GetExtension<PlayoutDelayLimits>(&playout);
break;
}
case kRtpExtensionVideoContentType:
VideoContentType content_type;
packet.GetExtension<VideoContentTypeExtension>(&content_type);
break;
case kRtpExtensionVideoTiming:
VideoSendTiming timing;
packet.GetExtension<VideoTimingExtension>(&timing);
break;
case kRtpExtensionRtpStreamId: {
std::string rsid;
packet.GetExtension<RtpStreamId>(&rsid);
break;
}
case kRtpExtensionRepairedRtpStreamId: {
std::string rsid;
packet.GetExtension<RepairedRtpStreamId>(&rsid);
break;
}
case kRtpExtensionMid: {
std::string mid;
packet.GetExtension<RtpMid>(&mid);
break;
}
case kRtpExtensionGenericFrameDescriptor00: {
RtpGenericFrameDescriptor descriptor;
packet.GetExtension<RtpGenericFrameDescriptorExtension00>(&descriptor);
break;
}
case kRtpExtensionColorSpace: {
ColorSpace color_space;
packet.GetExtension<ColorSpaceExtension>(&color_space);
break;
}
case kRtpExtensionInbandComfortNoise: {
absl::optional<uint8_t> noise_level;
packet.GetExtension<InbandComfortNoiseExtension>(&noise_level);
break;
}
case kRtpExtensionVideoLayersAllocation: {
VideoLayersAllocation allocation;
packet.GetExtension<RtpVideoLayersAllocationExtension>(&allocation);
break;
}
case kRtpExtensionVideoFrameTrackingId: {
uint16_t tracking_id;
packet.GetExtension<VideoFrameTrackingIdExtension>(&tracking_id);
break;
}
case kRtpExtensionGenericFrameDescriptor02:
// This extension requires state to read and so complicated that
// deserves own fuzzer.
break;
}
}
// Check that zero-ing mutable extensions wouldn't cause any problems.
packet.ZeroMutableExtensions();
}
} // namespace webrtc
|
