This CL adds methods to manipulate RTP header extension, particularly

content/browser/renderer_host/p2p/socket_host_unittest.cc

+// Copyright (c) 2014 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 "content/browser/renderer_host/p2p/socket_host.h"
+
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "content/browser/renderer_host/p2p/socket_host_test_utils.h"
+#include "net/base/ip_endpoint.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+// Rtp message with invalid length.
+static unsigned char kRtpMsgWithInvalidLength[] = {
+  0x94, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00,
+  0xAA, 0xBB, 0xCC, 0XDD,  // SSRC
+  0xDD, 0xCC, 0xBB, 0xAA   // Only 1 CSRC, but CC count is 4.
+};
+
+// Rtp message with single byte header extension, invalid extension length.
+static unsigned char kRtpMessageWithInvalidExtnLength[] = {
+  0x90, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00,
+  0xBE, 0xDE, 0x0A, 0x00   // Extn length - 0x0A00
+};
+
+// Valid rtp Message with 2 byte header extension.
+static unsigned char kRtpMsgWith2ByteExtnHeader[] = {
+  0x90, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00,
+  0xAA, 0xBB, 0xCC, 0XDD,  // SSRC
+  0x10, 0x00, 0x00, 0x01,  // 2 Byte header extension
+  0x01, 0x00, 0x00, 0x00
+};
+
+// Stun Indication message with Zero length
+static unsigned char kTurnSendIndicationMsgWithNoAttributes[] = {
+  0x00, 0x16, 0x00, 0x00,  // Zero length
+  0x21, 0x12, 0xA4, 0x42,  // magic cookie
+  '0', '1', '2', '3',      // transaction id
+  '4', '5', '6', '7',
+  '8', '9', 'a', 'b',
+};
+
+// Stun Send Indication message with invalid length in stun header.
+static unsigned char kTurnSendIndicationMsgWithInvalidLength[] = {
+  0x00, 0x16, 0xFF, 0x00,  // length of 0xFF00
+  0x21, 0x12, 0xA4, 0x42,  // magic cookie
+  '0', '1', '2', '3',      // transaction id
+  '4', '5', '6', '7',
+  '8', '9', 'a', 'b',
+};
+
+// Stun Send Indication message with no DATA attribute in message.
+static unsigned char kTurnSendIndicatinMsgWithNoDataAttribute[] = {
+  0x00, 0x16, 0x00, 0x08,  // length of
+  0x21, 0x12, 0xA4, 0x42,  // magic cookie
+  '0', '1', '2', '3',      // transaction id
+  '4', '5', '6', '7',
+  '8', '9', 'a', 'b',
+  0x00, 0x20, 0x00, 0x04,  // Mapped address.
+  0x00, 0x00, 0x00, 0x00
+};
+
+// A valid STUN indication message with a valid RTP header in data attribute
+// payload field and no extension bit set.
+static unsigned char kTurnSendIndicationMsgWithoutRtpExtension[] = {
+  0x00, 0x16, 0x00, 0x18,  // length of
+  0x21, 0x12, 0xA4, 0x42,  // magic cookie
+  '0', '1', '2', '3',      // transaction id
+  '4', '5', '6', '7',
+  '8', '9', 'a', 'b',
+  0x00, 0x20, 0x00, 0x04,  // Mapped address.
+  0x00, 0x00, 0x00, 0x00,
+  0x00, 0x13, 0x00, 0x0C,  // Data attribute.
+  0x80, 0x00, 0x00, 0x00,  // RTP packet.
+  0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00,
+};
+
+// A valid STUN indication message with a valid RTP header and a extension
+// header.
+static unsigned char kTurnSendIndicationMsgWithSendTimeExtension[] = {
+  0x00, 0x16, 0x00, 0x20,  // length of
+  0x21, 0x12, 0xA4, 0x42,  // magic cookie
+  '0', '1', '2', '3',      // transaction id
+  '4', '5', '6', '7',
+  '8', '9', 'a', 'b',
+  0x00, 0x20, 0x00, 0x04,  // Mapped address.
+  0x00, 0x00, 0x00, 0x00,
+  0x00, 0x13, 0x00, 0x14,  // Data attribute.
+  0x90, 0x00, 0x00, 0x00,  // RTP packet.
+  0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00,
+  0xBE, 0xDE, 0x00, 0x01,
+  0x32, 0xaa, 0xbb, 0xcc,
+};
+
+// A valid TURN channel header, but not RTP packet.
+static unsigned char kTurnChannelMessage[] = {
+  0x40, 0x00, 0x00, 0x04,
+  0xaa, 0xbb, 0xcc, 0xdd,
+};
+
+// Turn ChannelMessage with zero length of payload.
+static unsigned char kTurnChannelMessageWithZeroLength[] = {
+  0x40, 0x00, 0x00, 0x00
+};
+
+// RTP packet with single byte extension header of length 4 bytes.
+// Extension id = 3 and length = 3
+static unsigned char kRtpPacketWithSendTimeExtension[] = {
+  0x90, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00,
+  0xBE, 0xDE, 0x00, 0x01,
+  0x32, 0xaa, 0xbb, 0xcc,
+};
+
+namespace content {
+
+// This test verifies parsing of all invalid packets.
+TEST(P2PSocketHostTest, TestInvalidRtpMessages) {

[Solis, 2014/02/27 09:36:10]

Consider breaking this multi-test into several small test cases.

[Mallinath (Gone from Chromium), 2014/02/27 19:43:10]

Done.

+  int start_pos, rtp_length;
+  EXPECT_FALSE(GetRtpPacketStartPositionAndLength(
+      reinterpret_cast<char*>(kRtpMsgWithInvalidLength),

[Solis, 2014/02/27 09:36:10]

Why not change the interface of GetRtpPacketStartPositionAndLength() to take an
unsigned char, or even uint8_t, to avoid the need for this cast?

[Mallinath (Gone from Chromium), 2014/02/27 19:43:10]

The reason i kept char* because whole pipeline from renderer to browser
processing is using char* for packet. So I think it's better to cast in
unittests than changing whole pipe.

On 2014/02/27 09:36:10, Solis wrote:

+      sizeof(kRtpMsgWithInvalidLength),
+      &start_pos, &rtp_length));

[Solis, 2014/02/27 09:36:10]

You should initialize start_pos and rtp_length to something unlikely (negative
in this case) and verify that they're untouched at this point.

[Mallinath (Gone from Chromium), 2014/02/27 19:43:10]

Done.

+
+  EXPECT_FALSE(GetRtpPacketStartPositionAndLength(
+      reinterpret_cast<char*>(kRtpMessageWithInvalidExtnLength),
+      sizeof(kRtpMessageWithInvalidExtnLength),
+      &start_pos, &rtp_length));
+
+  EXPECT_FALSE(GetRtpPacketStartPositionAndLength(
+      reinterpret_cast<char*>(kTurnSendIndicationMsgWithNoAttributes),
+      sizeof(kTurnSendIndicationMsgWithNoAttributes),
+      &start_pos, &rtp_length));
+
+  EXPECT_FALSE(GetRtpPacketStartPositionAndLength(
+      reinterpret_cast<char*>(kTurnSendIndicationMsgWithInvalidLength),
+      sizeof(kTurnSendIndicationMsgWithInvalidLength),
+      &start_pos, &rtp_length));
+
+  EXPECT_FALSE(GetRtpPacketStartPositionAndLength(
+      reinterpret_cast<char*>(kTurnSendIndicatinMsgWithNoDataAttribute),
+      sizeof(kTurnSendIndicatinMsgWithNoDataAttribute),
+      &start_pos, &rtp_length));
+
+  EXPECT_FALSE(GetRtpPacketStartPositionAndLength(
+      reinterpret_cast<char*>(kTurnChannelMessage),
+      sizeof(kTurnChannelMessage),
+      &start_pos, &rtp_length));
+
+  EXPECT_FALSE(GetRtpPacketStartPositionAndLength(
+      reinterpret_cast<char*>(kTurnChannelMessageWithZeroLength),
+      sizeof(kTurnChannelMessageWithZeroLength),
+      &start_pos, &rtp_length));
+}
+
+// This test verifies seraching of RTP exension ID supplied as input in a
+// RTP packet. If it finds it will be update the the timestamp.
+TEST(P2PSocketHostTest, TestUpdateRtpAbsSendTimeExtension) {

[Solis, 2014/02/27 09:36:10]

Likewise, consider splitting up.

+  int start_pos, rtp_length;

[Solis, 2014/02/27 09:36:10]

initialize these

+  EXPECT_TRUE(GetRtpPacketStartPositionAndLength(
+      reinterpret_cast<char*>(kRtpMsgWith2ByteExtnHeader),
+      sizeof(kRtpMsgWith2ByteExtnHeader),
+      &start_pos, &rtp_length));
+  EXPECT_EQ(20, rtp_length);
+  EXPECT_EQ(0, start_pos);
+
+  EXPECT_FALSE(MaybeUpdateRtpAbsSendTimeExtn(
+    reinterpret_cast<char*>(kRtpMsgWith2ByteExtnHeader),
+    sizeof(kRtpMsgWith2ByteExtnHeader), 3));
+
+  EXPECT_TRUE(GetRtpPacketStartPositionAndLength(
+      reinterpret_cast<char*>(kTurnSendIndicationMsgWithoutRtpExtension),
+      sizeof(kTurnSendIndicationMsgWithoutRtpExtension),
+      &start_pos, &rtp_length));
+  EXPECT_EQ(12, rtp_length);
+  EXPECT_EQ(32, start_pos);
+
+  EXPECT_TRUE(MaybeUpdateRtpAbsSendTimeExtn(
+      reinterpret_cast<char*>(kTurnSendIndicationMsgWithoutRtpExtension),
+      sizeof(kTurnSendIndicationMsgWithoutRtpExtension), 3));
+
+  EXPECT_TRUE(GetRtpPacketStartPositionAndLength(
+      reinterpret_cast<char*>(kTurnSendIndicationMsgWithSendTimeExtension),
+      sizeof(kTurnSendIndicationMsgWithSendTimeExtension),
+      &start_pos, &rtp_length));
+  EXPECT_EQ(20, rtp_length);
+  EXPECT_EQ(32, start_pos);
+
+  EXPECT_TRUE(MaybeUpdateRtpAbsSendTimeExtn(
+      reinterpret_cast<char*>(kTurnSendIndicationMsgWithSendTimeExtension),
+      sizeof(kTurnSendIndicationMsgWithSendTimeExtension), 3));
+
+  EXPECT_TRUE(GetRtpPacketStartPositionAndLength(
+      reinterpret_cast<char*>(kRtpPacketWithSendTimeExtension),
+      sizeof(kRtpPacketWithSendTimeExtension),
+      &start_pos, &rtp_length));
+  EXPECT_EQ(20, rtp_length);
+  EXPECT_EQ(0, start_pos);
+
+  EXPECT_TRUE(MaybeUpdateRtpAbsSendTimeExtn(
+      reinterpret_cast<char*>(kRtpPacketWithSendTimeExtension),
+      sizeof(kRtpPacketWithSendTimeExtension), 3));
+}
+
+}  // namespace content