/*
* Copyright 2018 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 "p2p/base/mdns_message.h"
#include <map>
#include <set>
#include <string>
#include "rtc_base/byte_buffer.h"
#include "rtc_base/gunit.h"
#include "rtc_base/ip_address.h"
#include "rtc_base/socket_address.h"
#include "test/gmock.h"
#define ReadMdnsMessage(X, Y) ReadMdnsMessageTestCase(X, Y, sizeof(Y))
#define WriteMdnsMessageAndCompare(X, Y) \
WriteMdnsMessageAndCompareWithTestCast(X, Y, sizeof(Y))
using ::testing::ElementsAre;
using ::testing::Pair;
using ::testing::UnorderedElementsAre;
namespace webrtc {
namespace {
const uint8_t kSingleQuestionForIPv4AddrWithUnicastResponse[] = {
0x12, 0x34, // ID
0x00, 0x00, // flags
0x00, 0x01, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x06, 0x77, 0x65, 0x62, 0x72, 0x74, 0x63, // webrtc
0x03, 0x6f, 0x72, 0x67, // org
0x00, // null label
0x00, 0x01, // type A Record
0x80, 0x01, // class IN, unicast response
};
const uint8_t kTwoQuestionsForIPv4AndIPv6AddrWithMulticastResponse[] = {
0x12, 0x34, // ID
0x00, 0x00, // flags
0x00, 0x02, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x07, 0x77, 0x65, 0x62, 0x72, 0x74, 0x63, 0x34, // webrtc4
0x03, 0x6f, 0x72, 0x67, // org
0x00, // null label
0x00, 0x01, // type A Record
0x00, 0x01, // class IN, multicast response
0x07, 0x77, 0x65, 0x62, 0x72, 0x74, 0x63, 0x36, // webrtc6
0x03, 0x6f, 0x72, 0x67, // org
0x00, // null label
0x00, 0x1C, // type AAAA Record
0x00, 0x01, // class IN, multicast response
};
const uint8_t
kTwoQuestionsForIPv4AndIPv6AddrWithMulticastResponseAndNameCompression[] = {
0x12, 0x34, // ID
0x00, 0x00, // flags
0x00, 0x02, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x03, 0x77, 0x77, 0x77, // www
0x06, 0x77, 0x65, 0x62, 0x72, 0x74, 0x63, // webrtc
0x03, 0x6f, 0x72, 0x67, // org
0x00, // null label
0x00, 0x01, // type A Record
0x00, 0x01, // class IN, multicast response
0x04, 0x6d, 0x64, 0x6e, 0x73, // mdns
0xc0, 0x10, // offset 16, webrtc.org.
0x00, 0x1C, // type AAAA Record
0x00, 0x01, // class IN, multicast response
};
const uint8_t kThreeQuestionsWithTwoPointersToTheSameNameSuffix[] = {
0x12, 0x34, // ID
0x00, 0x00, // flags
0x00, 0x03, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x03, 0x77, 0x77, 0x77, // www
0x06, 0x77, 0x65, 0x62, 0x72, 0x74, 0x63, // webrtc
0x03, 0x6f, 0x72, 0x67, // org
0x00, // null label
0x00, 0x01, // type A Record
0x00, 0x01, // class IN, multicast response
0x04, 0x6d, 0x64, 0x6e, 0x73, // mdns
0xc0, 0x10, // offset 16, webrtc.org.
0x00, 0x1C, // type AAAA Record
0x00, 0x01, // class IN, multicast response
0xc0, 0x10, // offset 16, webrtc.org.
0x00, 0x01, // type A Record
0x00, 0x01, // class IN, multicast response
};
const uint8_t kThreeQuestionsWithPointerToNameSuffixContainingAnotherPointer[] =
{
0x12, 0x34, // ID
0x00, 0x00, // flags
0x00, 0x03, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x03, 0x77, 0x77, 0x77, // www
0x06, 0x77, 0x65, 0x62, 0x72, 0x74, 0x63, // webrtc
0x03, 0x6f, 0x72, 0x67, // org
0x00, // null label
0x00, 0x01, // type A Record
0x00, 0x01, // class IN, multicast response
0x04, 0x6d, 0x64, 0x6e, 0x73, // mdns
0xc0, 0x10, // offset 16, webrtc.org.
0x00, 0x1C, // type AAAA Record
0x00, 0x01, // class IN, multicast response
0x03, 0x77, 0x77, 0x77, // www
0xc0, 0x20, // offset 32, mdns.webrtc.org.
0x00, 0x01, // type A Record
0x00, 0x01, // class IN, multicast response
};
const uint8_t kCorruptedQuestionWithNameCompression1[] = {
0x12, 0x34, // ID
0x84, 0x00, // flags
0x00, 0x01, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0xc0, 0x0c, // offset 12,
0x00, 0x01, // type A Record
0x00, 0x01, // class IN
};
const uint8_t kCorruptedQuestionWithNameCompression2[] = {
0x12, 0x34, // ID
0x84, 0x00, // flags
0x00, 0x01, // number of questions
0x00, 0x00, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x01, 0x77, // w
0xc0, 0x0c, // offset 12,
0x00, 0x01, // type A Record
0x00, 0x01, // class IN
};
const uint8_t kSingleAuthoritativeAnswerWithIPv4Addr[] = {
0x12, 0x34, // ID
0x84, 0x00, // flags
0x00, 0x00, // number of questions
0x00, 0x01, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x06, 0x77, 0x65, 0x62, 0x72, 0x74, 0x63, // webrtc
0x03, 0x6f, 0x72, 0x67, // org
0x00, // null label
0x00, 0x01, // type A Record
0x00, 0x01, // class IN
0x00, 0x00, 0x00, 0x78, // TTL, 120 seconds
0x00, 0x04, // rdlength, 32 bits
0xC0, 0xA8, 0x00, 0x01, // 192.168.0.1
};
const uint8_t kTwoAuthoritativeAnswersWithIPv4AndIPv6Addr[] = {
0x12, 0x34, // ID
0x84, 0x00, // flags
0x00, 0x00, // number of questions
0x00, 0x02, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x07, 0x77, 0x65, 0x62, 0x72, 0x74, 0x63, 0x34, // webrtc4
0x03, 0x6f, 0x72, 0x67, // org
0x00, // null label
0x00, 0x01, // type A Record
0x00, 0x01, // class IN
0x00, 0x00, 0x00, 0x3c, // TTL, 60 seconds
0x00, 0x04, // rdlength, 32 bits
0xC0, 0xA8, 0x00, 0x01, // 192.168.0.1
0x07, 0x77, 0x65, 0x62, 0x72, 0x74, 0x63, 0x36, // webrtc6
0x03, 0x6f, 0x72, 0x67, // org
0x00, // null label
0x00, 0x1C, // type AAAA Record
0x00, 0x01, // class IN
0x00, 0x00, 0x00, 0x78, // TTL, 120 seconds
0x00, 0x10, // rdlength, 128 bits
0xfd, 0x12, 0x34, 0x56, 0x78, 0x9a, 0x00, 0x01, // fd12:3456:789a:1::1
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
};
const uint8_t kTwoAuthoritativeAnswersWithIPv4AndIPv6AddrWithNameCompression[] =
{
0x12, 0x34, // ID
0x84, 0x00, // flags
0x00, 0x00, // number of questions
0x00, 0x02, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x03, 0x77, 0x77, 0x77, // www
0x06, 0x77, 0x65, 0x62, 0x72, 0x74, 0x63, // webrtc
0x03, 0x6f, 0x72, 0x67, // org
0x00, // null label
0x00, 0x01, // type A Record
0x00, 0x01, // class IN
0x00, 0x00, 0x00, 0x3c, // TTL, 60 seconds
0x00, 0x04, // rdlength, 32 bits
0xc0, 0xA8, 0x00, 0x01, // 192.168.0.1
0xc0, 0x10, // offset 16, webrtc.org.
0x00, 0x1C, // type AAAA Record
0x00, 0x01, // class IN
0x00, 0x00, 0x00, 0x78, // TTL, 120 seconds
0x00, 0x10, // rdlength, 128 bits
0xfd, 0x12, 0x34, 0x56, 0x78, 0x9a, 0x00, 0x01, // fd12:3456:789a:1::1
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
};
const uint8_t kCorruptedAnswerWithNameCompression1[] = {
0x12, 0x34, // ID
0x84, 0x00, // flags
0x00, 0x00, // number of questions
0x00, 0x01, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0xc0, 0x0c, // offset 12,
0x00, 0x01, // type A Record
0x00, 0x01, // class IN
0x00, 0x00, 0x00, 0x3c, // TTL, 60 seconds
0x00, 0x04, // rdlength, 32 bits
0xc0, 0xA8, 0x00, 0x01, // 192.168.0.1
};
const uint8_t kCorruptedAnswerWithNameCompression2[] = {
0x12, 0x34, // ID
0x84, 0x00, // flags
0x00, 0x00, // number of questions
0x00, 0x01, // number of answer rr
0x00, 0x00, // number of name server rr
0x00, 0x00, // number of additional rr
0x01, 0x77, // w
0xc0, 0x0c, // offset 12,
0x00, 0x01, // type A Record
0x00, 0x01, // class IN
0x00, 0x00, 0x00, 0x3c, // TTL, 60 seconds
0x00, 0x04, // rdlength, 32 bits
0xc0, 0xA8, 0x00, 0x01, // 192.168.0.1
};
bool ReadMdnsMessageTestCase(MdnsMessage* msg,
const uint8_t* testcase,
size_t size) {
MessageBufferReader buf(reinterpret_cast<const char*>(testcase), size);
return msg->Read(&buf);
}
void WriteMdnsMessageAndCompareWithTestCast(MdnsMessage* msg,
const uint8_t* testcase,
size_t size) {
rtc::ByteBufferWriter out;
EXPECT_TRUE(msg->Write(&out));
EXPECT_EQ(size, out.Length());
int len = static_cast<int>(out.Length());
rtc::ByteBufferReader read_buf(out);
std::string bytes;
read_buf.ReadString(&bytes, len);
std::string testcase_bytes(reinterpret_cast<const char*>(testcase), size);
EXPECT_EQ(testcase_bytes, bytes);
}
bool GetQueriedNames(MdnsMessage* msg, std::set<std::string>* names) {
if (!msg->IsQuery() || msg->question_section().empty()) {
return false;
}
for (const auto& question : msg->question_section()) {
names->insert(question.GetName());
}
return true;
}
bool GetResolution(MdnsMessage* msg,
std::map<std::string, rtc::IPAddress>* names) {
if (msg->IsQuery() || msg->answer_section().empty()) {
return false;
}
for (const auto& answer : msg->answer_section()) {
rtc::IPAddress resolved_addr;
if (!answer.GetIPAddressFromRecordData(&resolved_addr)) {
return false;
}
(*names)[answer.GetName()] = resolved_addr;
}
return true;
}
} // namespace
TEST(MdnsMessageTest, ReadSingleQuestionForIPv4Address) {
MdnsMessage msg;
ASSERT_TRUE(
ReadMdnsMessage(&msg, kSingleQuestionForIPv4AddrWithUnicastResponse));
EXPECT_TRUE(msg.IsQuery());
EXPECT_EQ(0x1234, msg.GetId());
ASSERT_EQ(1u, msg.question_section().size());
EXPECT_EQ(0u, msg.answer_section().size());
EXPECT_EQ(0u, msg.authority_section().size());
EXPECT_EQ(0u, msg.additional_section().size());
EXPECT_TRUE(msg.ShouldUnicastResponse());
const auto& question = msg.question_section()[0];
EXPECT_EQ(SectionEntryType::kA, question.GetType());
std::set<std::string> queried_names;
EXPECT_TRUE(GetQueriedNames(&msg, &queried_names));
EXPECT_THAT(queried_names, ElementsAre("webrtc.org."));
}
TEST(MdnsMessageTest, ReadTwoQuestionsForIPv4AndIPv6Addr) {
MdnsMessage msg;
ASSERT_TRUE(ReadMdnsMessage(
&msg, kTwoQuestionsForIPv4AndIPv6AddrWithMulticastResponse));
EXPECT_TRUE(msg.IsQuery());
EXPECT_EQ(0x1234, msg.GetId());
ASSERT_EQ(2u, msg.question_section().size());
EXPECT_EQ(0u, msg.answer_section().size());
EXPECT_EQ(0u, msg.authority_section().size());
EXPECT_EQ(0u, msg.additional_section().size());
const auto& question1 = msg.question_section()[0];
const auto& question2 = msg.question_section()[1];
EXPECT_EQ(SectionEntryType::kA, question1.GetType());
EXPECT_EQ(SectionEntryType::kAAAA, question2.GetType());
std::set<std::string> queried_names;
EXPECT_TRUE(GetQueriedNames(&msg, &queried_names));
EXPECT_THAT(queried_names,
UnorderedElementsAre("webrtc4.org.", "webrtc6.org."));
}
TEST(MdnsMessageTest, ReadTwoQuestionsForIPv4AndIPv6AddrWithNameCompression) {
MdnsMessage msg;
ASSERT_TRUE(ReadMdnsMessage(
&msg,
kTwoQuestionsForIPv4AndIPv6AddrWithMulticastResponseAndNameCompression));
ASSERT_EQ(2u, msg.question_section().size());
const auto& question1 = msg.question_section()[0];
const auto& question2 = msg.question_section()[1];
EXPECT_EQ(SectionEntryType::kA, question1.GetType());
EXPECT_EQ(SectionEntryType::kAAAA, question2.GetType());
std::set<std::string> queried_names;
EXPECT_TRUE(GetQueriedNames(&msg, &queried_names));
EXPECT_THAT(queried_names,
UnorderedElementsAre("www.webrtc.org.", "mdns.webrtc.org."));
}
TEST(MdnsMessageTest, ReadThreeQuestionsWithTwoPointersToTheSameNameSuffix) {
MdnsMessage msg;
ASSERT_TRUE(
ReadMdnsMessage(&msg, kThreeQuestionsWithTwoPointersToTheSameNameSuffix));
ASSERT_EQ(3u, msg.question_section().size());
const auto& question1 = msg.question_section()[0];
const auto& question2 = msg.question_section()[1];
const auto& question3 = msg.question_section()[2];
EXPECT_EQ(SectionEntryType::kA, question1.GetType());
EXPECT_EQ(SectionEntryType::kAAAA, question2.GetType());
EXPECT_EQ(SectionEntryType::kA, question3.GetType());
std::set<std::string> queried_names;
EXPECT_TRUE(GetQueriedNames(&msg, &queried_names));
EXPECT_THAT(queried_names,
UnorderedElementsAre("www.webrtc.org.", "mdns.webrtc.org.",
"webrtc.org."));
}
TEST(MdnsMessageTest,
ReadThreeQuestionsWithPointerToNameSuffixContainingAnotherPointer) {
MdnsMessage msg;
ASSERT_TRUE(ReadMdnsMessage(
&msg, kThreeQuestionsWithPointerToNameSuffixContainingAnotherPointer));
ASSERT_EQ(3u, msg.question_section().size());
const auto& question1 = msg.question_section()[0];
const auto& question2 = msg.question_section()[1];
const auto& question3 = msg.question_section()[2];
EXPECT_EQ(SectionEntryType::kA, question1.GetType());
EXPECT_EQ(SectionEntryType::kAAAA, question2.GetType());
EXPECT_EQ(SectionEntryType::kA, question3.GetType());
std::set<std::string> queried_names;
EXPECT_TRUE(GetQueriedNames(&msg, &queried_names));
EXPECT_THAT(queried_names,
UnorderedElementsAre("www.webrtc.org.", "mdns.webrtc.org.",
"www.mdns.webrtc.org."));
}
TEST(MdnsMessageTest,
ReadQuestionWithCorruptedPointerInNameCompressionShouldFail) {
MdnsMessage msg;
EXPECT_FALSE(ReadMdnsMessage(&msg, kCorruptedQuestionWithNameCompression1));
EXPECT_FALSE(ReadMdnsMessage(&msg, kCorruptedQuestionWithNameCompression2));
}
TEST(MdnsMessageTest, ReadSingleAnswerForIPv4Addr) {
MdnsMessage msg;
ASSERT_TRUE(ReadMdnsMessage(&msg, kSingleAuthoritativeAnswerWithIPv4Addr));
EXPECT_FALSE(msg.IsQuery());
EXPECT_TRUE(msg.IsAuthoritative());
EXPECT_EQ(0x1234, msg.GetId());
EXPECT_EQ(0u, msg.question_section().size());
ASSERT_EQ(1u, msg.answer_section().size());
EXPECT_EQ(0u, msg.authority_section().size());
EXPECT_EQ(0u, msg.additional_section().size());
const auto& answer = msg.answer_section()[0];
EXPECT_EQ(SectionEntryType::kA, answer.GetType());
EXPECT_EQ(120u, answer.GetTtlSeconds());
std::map<std::string, rtc::IPAddress> resolution;
EXPECT_TRUE(GetResolution(&msg, &resolution));
rtc::IPAddress expected_addr(rtc::SocketAddress("192.168.0.1", 0).ipaddr());
EXPECT_THAT(resolution, ElementsAre(Pair("webrtc.org.", expected_addr)));
}
TEST(MdnsMessageTest, ReadTwoAnswersForIPv4AndIPv6Addr) {
MdnsMessage msg;
ASSERT_TRUE(
ReadMdnsMessage(&msg, kTwoAuthoritativeAnswersWithIPv4AndIPv6Addr));
EXPECT_FALSE(msg.IsQuery());
EXPECT_TRUE(msg.IsAuthoritative());
EXPECT_EQ(0x1234, msg.GetId());
EXPECT_EQ(0u, msg.question_section().size());
ASSERT_EQ(2u, msg.answer_section().size());
EXPECT_EQ(0u, msg.authority_section().size());
EXPECT_EQ(0u, msg.additional_section().size());
const auto& answer1 = msg.answer_section()[0];
const auto& answer2 = msg.answer_section()[1];
EXPECT_EQ(SectionEntryType::kA, answer1.GetType());
EXPECT_EQ(SectionEntryType::kAAAA, answer2.GetType());
EXPECT_EQ(60u, answer1.GetTtlSeconds());
EXPECT_EQ(120u, answer2.GetTtlSeconds());
std::map<std::string, rtc::IPAddress> resolution;
EXPECT_TRUE(GetResolution(&msg, &resolution));
rtc::IPAddress expected_addr_ipv4(
rtc::SocketAddress("192.168.0.1", 0).ipaddr());
rtc::IPAddress expected_addr_ipv6(
rtc::SocketAddress("fd12:3456:789a:1::1", 0).ipaddr());
EXPECT_THAT(resolution,
UnorderedElementsAre(Pair("webrtc4.org.", expected_addr_ipv4),
Pair("webrtc6.org.", expected_addr_ipv6)));
}
TEST(MdnsMessageTest, ReadTwoAnswersForIPv4AndIPv6AddrWithNameCompression) {
MdnsMessage msg;
ASSERT_TRUE(ReadMdnsMessage(
&msg, kTwoAuthoritativeAnswersWithIPv4AndIPv6AddrWithNameCompression));
std::map<std::string, rtc::IPAddress> resolution;
EXPECT_TRUE(GetResolution(&msg, &resolution));
rtc::IPAddress expected_addr_ipv4(
rtc::SocketAddress("192.168.0.1", 0).ipaddr());
rtc::IPAddress expected_addr_ipv6(
rtc::SocketAddress("fd12:3456:789a:1::1", 0).ipaddr());
EXPECT_THAT(resolution,
UnorderedElementsAre(Pair("www.webrtc.org.", expected_addr_ipv4),
Pair("webrtc.org.", expected_addr_ipv6)));
}
TEST(MdnsMessageTest,
ReadAnswerWithCorruptedPointerInNameCompressionShouldFail) {
MdnsMessage msg;
EXPECT_FALSE(ReadMdnsMessage(&msg, kCorruptedAnswerWithNameCompression1));
EXPECT_FALSE(ReadMdnsMessage(&msg, kCorruptedAnswerWithNameCompression2));
}
TEST(MdnsMessageTest, WriteSingleQuestionForIPv4Addr) {
MdnsMessage msg;
msg.SetId(0x1234);
msg.SetQueryOrResponse(true);
MdnsQuestion question;
question.SetName("webrtc.org.");
question.SetType(SectionEntryType::kA);
question.SetClass(SectionEntryClass::kIN);
question.SetUnicastResponse(true);
msg.AddQuestion(question);
WriteMdnsMessageAndCompare(&msg,
kSingleQuestionForIPv4AddrWithUnicastResponse);
}
TEST(MdnsMessageTest, WriteTwoQuestionsForIPv4AndIPv6Addr) {
MdnsMessage msg;
msg.SetId(0x1234);
msg.SetQueryOrResponse(true);
MdnsQuestion question1;
question1.SetName("webrtc4.org.");
question1.SetType(SectionEntryType::kA);
question1.SetClass(SectionEntryClass::kIN);
msg.AddQuestion(question1);
MdnsQuestion question2;
question2.SetName("webrtc6.org.");
question2.SetType(SectionEntryType::kAAAA);
question2.SetClass(SectionEntryClass::kIN);
msg.AddQuestion(question2);
WriteMdnsMessageAndCompare(
&msg, kTwoQuestionsForIPv4AndIPv6AddrWithMulticastResponse);
}
TEST(MdnsMessageTest, WriteSingleAnswerToIPv4Addr) {
MdnsMessage msg;
msg.SetId(0x1234);
msg.SetQueryOrResponse(false);
msg.SetAuthoritative(true);
MdnsResourceRecord answer;
answer.SetName("webrtc.org.");
answer.SetType(SectionEntryType::kA);
answer.SetClass(SectionEntryClass::kIN);
EXPECT_TRUE(answer.SetIPAddressInRecordData(
rtc::SocketAddress("192.168.0.1", 0).ipaddr()));
answer.SetTtlSeconds(120);
msg.AddAnswerRecord(answer);
WriteMdnsMessageAndCompare(&msg, kSingleAuthoritativeAnswerWithIPv4Addr);
}
TEST(MdnsMessageTest, WriteTwoAnswersToIPv4AndIPv6Addr) {
MdnsMessage msg;
msg.SetId(0x1234);
msg.SetQueryOrResponse(false);
msg.SetAuthoritative(true);
MdnsResourceRecord answer1;
answer1.SetName("webrtc4.org.");
answer1.SetType(SectionEntryType::kA);
answer1.SetClass(SectionEntryClass::kIN);
answer1.SetIPAddressInRecordData(
rtc::SocketAddress("192.168.0.1", 0).ipaddr());
answer1.SetTtlSeconds(60);
msg.AddAnswerRecord(answer1);
MdnsResourceRecord answer2;
answer2.SetName("webrtc6.org.");
answer2.SetType(SectionEntryType::kAAAA);
answer2.SetClass(SectionEntryClass::kIN);
answer2.SetIPAddressInRecordData(
rtc::SocketAddress("fd12:3456:789a:1::1", 0).ipaddr());
answer2.SetTtlSeconds(120);
msg.AddAnswerRecord(answer2);
WriteMdnsMessageAndCompare(&msg, kTwoAuthoritativeAnswersWithIPv4AndIPv6Addr);
}
} // namespace webrtc