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Copy pathESP8266mDNS Transfer.cpp
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ESP8266mDNS Transfer.cpp
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/*
* ESP8266mDNS Transfer.cpp
*
* License (MIT license):
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
extern "C" {
#include "user_interface.h"
}
#include "lwip/prot/dns.h" // DNS_RRTYPE_xxx, DNS_MQUERY_PORT
#include "../LEADump/LEADump.h"
#include "ESP8266mDNS Priv.h"
/*
* namespace LEA_MDNSResponder
*/
namespace LEA_MDNSResponder {
/**
* CONST STRINGS
*/
static const char* scpcLocal = "local";
static const char* scpcServices = "services";
static const char* scpcDNSSD = "dns-sd";
static const char* scpcUDP = "udp";
//static const char* scpcTCP = "tcp";
#ifdef MDNS_IP4_SUPPORT
static const char* scpcReverseIP4Domain = "in-addr";
#endif
#ifdef MDNS_IP6_SUPPORT
static const char* scpcReverseIP6Domain = "ip6";
#endif
static const char* scpcReverseTopDomain = "arpa";
/**
* TRANSFER
*/
/**
* SENDING
*/
/*
* MDNSResponder::_sendMDNSMessage
*
* Unicast responses are prepared and sent directly to the querier.
* Multicast responses or queries are transferred to _sendMDNSMessage_Multicast
*
* Any reply flags in installed services are removed at the end!
*
*/
bool MDNSResponder::_sendMDNSMessage(MDNSResponder::stcMDNSSendParameter& p_rSendParameter) {
bool bResult = true;
if (p_rSendParameter.m_bResponse) {
if (p_rSendParameter.m_bUnicast) { // Unicast response -> Send to querier
DEBUG_EX_ERR(if (!m_pUDPContext->getRemoteAddress()) { DEBUG_OUTPUT.printf(F("[MDNSResponder] _sendMDNSMessage: MISSING remote address for response!\n")); });
ip_addr_t ipRemote;
ipRemote.addr = m_pUDPContext->getRemoteAddress();
bResult = ((_prepareMDNSMessage(p_rSendParameter, _getResponseMulticastInterface(SOFTAP_MODE | STATION_MODE))) &&
(m_pUDPContext->send(&ipRemote, m_pUDPContext->getRemotePort())));
}
else { // Multicast response -> Send via the same network interface, that received the query
bResult = _sendMDNSMessage_Multicast(p_rSendParameter, (SOFTAP_MODE | STATION_MODE));
}
}
else { // Multicast query -> Send by all available network interfaces
const int caiWiFiOpModes[2] = { SOFTAP_MODE, STATION_MODE };
for (int iInterfaceId=0; ((bResult) && (iInterfaceId<=1)); ++iInterfaceId) {
if (wifi_get_opmode() & caiWiFiOpModes[iInterfaceId]) {
bResult = _sendMDNSMessage_Multicast(p_rSendParameter, caiWiFiOpModes[iInterfaceId]);
}
}
}
// Finally clear service reply masks
for (stcMDNSService* pService=m_pServices; pService; pService=pService->m_pNext) {
pService->m_u8ReplyMask = 0;
}
DEBUG_EX_ERR(if (!bResult) { DEBUG_OUTPUT.printf(F("[MDNSResponder] _sendMDNSMessage: FAILED!\n")); });
return bResult;
}
/*
* MDNSResponder::_sendMDNSMessage_Multicast
*
* Fills the UDP output buffer (via _prepareMDNSMessage) and sends the buffer
* via the selected WiFi interface (Station or AP)
*/
bool MDNSResponder::_sendMDNSMessage_Multicast(MDNSResponder::stcMDNSSendParameter& p_rSendParameter,
int p_iWiFiOpMode) {
bool bResult = false;
ip_addr_t ifFromAddress;
ifFromAddress.addr = _getResponseMulticastInterface(p_iWiFiOpMode);
IPAddress fromIPAddress(ifFromAddress.addr);
m_pUDPContext->setMulticastInterface(ifFromAddress);
ip_addr_t toMulticastAddress;
#ifdef MDNS_IP4_SUPPORT
toMulticastAddress.addr = DNS_MQUERY_IPV4_GROUP_INIT;
#endif
#ifdef MDNS_IP6_SUPPORT
//TODO: set multicast address
toMulticastAddress.addr = DNS_MQUERY_IPV6_GROUP_INIT;
#endif
DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _sendMDNSMessage_Multicast: Will send to '%s'.\n"), IPAddress(toMulticastAddress.addr).toString().c_str()););
bResult = ((_prepareMDNSMessage(p_rSendParameter, fromIPAddress)) &&
(m_pUDPContext->send(&toMulticastAddress, DNS_MQUERY_PORT)));
DEBUG_EX_ERR(if (!bResult) { DEBUG_OUTPUT.printf(F("[MDNSResponder] _sendMDNSMessage_Multicast: FAILED!\n")); });
return bResult;
}
/*
* MDNSResponder::_prepareMDNSMessage
*
* The MDNS message is composed in a two-step process.
* In the first loop 'only' the header informations (mainly number of answers) are collected,
* while in the seconds loop, the header and all queries and answers are written to the UDP
* output buffer.
*
*/
bool MDNSResponder::_prepareMDNSMessage(MDNSResponder::stcMDNSSendParameter& p_rSendParameter,
IPAddress p_IPAddress) {
DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage\n")););
bool bResult = true;
// Prepare header; count answers
_stcMDNS_MsgHeader msgHeader(0, p_rSendParameter.m_bResponse, 0, p_rSendParameter.m_bAuthorative);
// If this is a response, the answers are anwers,
// else this is a query or probe and the answers go into auth section
uint16_t& ru16Answers = (p_rSendParameter.m_bResponse
? msgHeader.m_u16ANCount
: msgHeader.m_u16NSCount);
/**
* enuSequence
*/
enum enuSequence {
Sequence_Count = 0,
Sequence_Send = 1
};
// Two step sequence: 'Count' and 'Send'
for (uint32_t sequence=Sequence_Count; ((bResult) && (sequence<=Sequence_Send)); ++sequence) {
DEBUG_EX_INFO(
if (Sequence_Send == sequence) {
DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: ID:%u QR:%u OP:%u AA:%u TC:%u RD:%u RA:%u R:%u QD:%u AN:%u NS:%u AR:%u\n"),
(unsigned)msgHeader.m_u16ID,
(unsigned)msgHeader.m_1bQR, (unsigned)msgHeader.m_4bOpcode, (unsigned)msgHeader.m_1bAA, (unsigned)msgHeader.m_1bTC, (unsigned)msgHeader.m_1bRD,
(unsigned)msgHeader.m_1bRA, (unsigned)msgHeader.m_4bRCode,
(unsigned)msgHeader.m_u16QDCount,
(unsigned)msgHeader.m_u16ANCount,
(unsigned)msgHeader.m_u16NSCount,
(unsigned)msgHeader.m_u16ARCount);
}
);
// Count/send
// Header
bResult = ((Sequence_Count == sequence)
? true
: _writeMDNSMsgHeader(msgHeader, p_rSendParameter));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSMsgHeader FAILED!\n")););
// Questions
for (stcMDNS_RRQuestion* pQuestion=p_rSendParameter.m_pQuestions; ((bResult) && (pQuestion)); pQuestion=pQuestion->m_pNext) {
((Sequence_Count == sequence)
? ++msgHeader.m_u16QDCount
: (bResult = _writeMDNSQuestion(*pQuestion, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSQuestion FAILED!\n")););
}
// Answers and authorative answers
#ifdef MDNS_IP4_SUPPORT
if ((bResult) &&
(p_rSendParameter.m_u8HostReplyMask & ContentFlag_A)) {
((Sequence_Count == sequence)
? ++ru16Answers
: (bResult = _writeMDNSAnswer_A(p_IPAddress, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSAnswer_A(A) FAILED!\n")););
}
if ((bResult) &&
(p_rSendParameter.m_u8HostReplyMask & ContentFlag_PTR_IP4)) {
((Sequence_Count == sequence)
? ++ru16Answers
: (bResult = _writeMDNSAnswer_PTR_IP4(p_IPAddress, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSAnswer_PTR_IP4 FAILED!\n")););
}
#endif
#ifdef MDNS_IP6_SUPPORT
if ((bResult) &&
(p_rSendParameter.m_u8HostReplyMask & ContentFlag_AAAA)) {
((Sequence_Count == sequence)
? ++ru16Answers
: (bResult = _writeMDNSAnswer_AAAA(p_IPAddress, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSAnswer_AAAA(A) FAILED!\n")););
}
if ((bResult) &&
(p_rSendParameter.m_u8HostReplyMask & ContentFlag_PTR_IP6)) {
((Sequence_Count == sequence)
? ++ru16Answers
: (bResult = _writeMDNSAnswer_PTR_IP6(p_IPAddress, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSAnswer_PTR_IP6 FAILED!\n")););
}
#endif
for (stcMDNSService* pService=m_pServices; ((bResult) && (pService)); pService=pService->m_pNext) {
if ((bResult) &&
(pService->m_u8ReplyMask & ContentFlag_PTR_TYPE)) {
((Sequence_Count == sequence)
? ++ru16Answers
: (bResult = _writeMDNSAnswer_PTR_TYPE(*pService, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSAnswer_PTR_TYPE FAILED!\n")););
}
if ((bResult) &&
(pService->m_u8ReplyMask & ContentFlag_PTR_NAME)) {
((Sequence_Count == sequence)
? ++ru16Answers
: (bResult = _writeMDNSAnswer_PTR_NAME(*pService, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSAnswer_PTR_NAME FAILED!\n")););
}
if ((bResult) &&
(pService->m_u8ReplyMask & ContentFlag_SRV)) {
((Sequence_Count == sequence)
? ++ru16Answers
: (bResult = _writeMDNSAnswer_SRV(*pService, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSAnswer_SRV(A) FAILED!\n")););
}
if ((bResult) &&
(pService->m_u8ReplyMask & ContentFlag_TXT)) {
((Sequence_Count == sequence)
? ++ru16Answers
: (bResult = _writeMDNSAnswer_TXT(*pService, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSAnswer_TXT(A) FAILED!\n")););
}
} // for services
// Additional answers
#ifdef MDNS_IP4_SUPPORT
bool bNeedsAdditionalAnswerA = false;
#endif
#ifdef MDNS_IP6_SUPPORT
bool bNeedsAdditionalAnswerAAAA = false;
#endif
for (stcMDNSService* pService=m_pServices; ((bResult) && (pService)); pService=pService->m_pNext) {
if ((bResult) &&
(pService->m_u8ReplyMask & ContentFlag_PTR_NAME) && // If PTR_NAME is requested, AND
(!(pService->m_u8ReplyMask & ContentFlag_SRV))) { // NOT SRV -> add SRV as additional answer
((Sequence_Count == sequence)
? ++msgHeader.m_u16ARCount
: (bResult = _writeMDNSAnswer_SRV(*pService, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSAnswer_SRV(B) FAILED!\n")););
}
if ((bResult) &&
(pService->m_u8ReplyMask & ContentFlag_PTR_NAME) && // If PTR_NAME is requested, AND
(!(pService->m_u8ReplyMask & ContentFlag_TXT))) { // NOT TXT -> add TXT as additional answer
((Sequence_Count == sequence)
? ++msgHeader.m_u16ARCount
: (bResult = _writeMDNSAnswer_TXT(*pService, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSAnswer_TXT(B) FAILED!\n")););
}
if ((pService->m_u8ReplyMask & (ContentFlag_PTR_NAME | ContentFlag_SRV)) || // If service instance name or SRV OR
(p_rSendParameter.m_u8HostReplyMask & (ContentFlag_A | ContentFlag_AAAA))) { // any host IP address is requested
#ifdef MDNS_IP4_SUPPORT
if ((bResult) &&
(!(p_rSendParameter.m_u8HostReplyMask & ContentFlag_A))) { // Add IP4 address
bNeedsAdditionalAnswerA = true;
}
#endif
#ifdef MDNS_IP6_SUPPORT
if ((bResult) &&
(!(p_rSendParameter.m_u8HostReplyMask & ContentFlag_AAAA))) { // Add IP6 address
bNeedsAdditionalAnswerAAAA = true;
}
#endif
}
} // for services
// Answer A needed?
#ifdef MDNS_IP4_SUPPORT
if ((bResult) &&
(bNeedsAdditionalAnswerA)) {
((Sequence_Count == sequence)
? ++msgHeader.m_u16ARCount
: (bResult = _writeMDNSAnswer_A(p_IPAddress, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSAnswer_A(B) FAILED!\n")););
}
#endif
#ifdef MDNS_IP6_SUPPORT
// Answer AAAA needed?
if ((bResult) &&
(bNeedsAdditionalAnswerAAAA)) {
((Sequence_Count == sequence)
? ++msgHeader.m_u16ARCount
: (bResult = _writeMDNSAnswer_AAAA(p_IPAddress, p_rSendParameter)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: _writeMDNSAnswer_AAAA(B) FAILED!\n")););
}
#endif
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: Loop %i FAILED!\n"), sequence););
} // for sequence
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _prepareMDNSMessage: FAILED!\n")););
return bResult;
}
/*
* MDNSResponder::_sendMDNSServiceQuery
*
* Creates and sends a PTR query for the given service domain.
*
*/
bool MDNSResponder::_sendMDNSServiceQuery(const MDNSResponder::stcMDNSServiceQuery& p_ServiceQuery) {
return _sendMDNSQuery(p_ServiceQuery.m_ServiceTypeDomain, DNS_RRTYPE_PTR);
}
/*
* MDNSResponder::_sendMDNSQuery
*
* Creates and sends a query for the given domain and query type.
*
*/
bool MDNSResponder::_sendMDNSQuery(const MDNSResponder::stcMDNS_RRDomain& p_QueryDomain,
uint16_t p_u16QueryType) {
bool bResult = false;
stcMDNSSendParameter sendParameter;
if (0 != ((sendParameter.m_pQuestions = new stcMDNS_RRQuestion))) {
sendParameter.m_pQuestions->m_Header.m_Domain = p_QueryDomain;
sendParameter.m_pQuestions->m_bUnicast = true;
sendParameter.m_pQuestions->m_Header.m_Attributes.m_u16Type = p_u16QueryType;
sendParameter.m_pQuestions->m_Header.m_Attributes.m_u16Class = (0x8000 | DNS_RRCLASS_IN); // Unicast & INternet
bResult = _sendMDNSMessage(sendParameter);
} // else: FAILED to alloc question
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _sendMDNSQuery: FAILED to alloc question!\n")););
return bResult;
}
/*
* MDNSResponder::_getResponseMulticastInterface
*
* Selects the appropriate interface for responses.
* If AP mode is enabled and the remote contact is in the APs local net, then the
* AP interface is used to send the response.
* Otherwise the Station interface (if available) is used.
*
*/
IPAddress MDNSResponder::_getResponseMulticastInterface(int p_iWiFiOpModes) const {
ip_info IPInfo_Local;
bool bFoundMatch = false;
if ((p_iWiFiOpModes & SOFTAP_MODE) &&
(wifi_get_opmode() & SOFTAP_MODE)) {
//DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _getResponseMulticastInterface: SOFTAP_MODE\n")););
// Get remote IP address
ip_info IPInfo_Remote;
IPInfo_Remote.ip.addr = m_pUDPContext->getRemoteAddress();
// Get local (AP) IP address
wifi_get_ip_info(SOFTAP_IF, &IPInfo_Local);
if ((IPInfo_Local.ip.addr) && // Has local AP IP address AND
(ip_addr_netcmp(&IPInfo_Remote.ip, &IPInfo_Local.ip, &IPInfo_Local.netmask))) { // Remote address is in the same subnet as the AP
bFoundMatch = true;
}
}
if ((!bFoundMatch) &&
(p_iWiFiOpModes & STATION_MODE) &&
(wifi_get_opmode() & STATION_MODE)) {
//DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _getResponseMulticastInterface: STATION_MODE\n")););
// Get local (STATION) IP address
wifi_get_ip_info(STATION_IF, &IPInfo_Local);
}
//DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _getResponseMulticastInterface(%i): %s\n"), p_iWiFiOpModes, IPAddress(IPInfo_Local.ip.addr).toString().c_str()););
return IPAddress(IPInfo_Local.ip.addr);
}
/**
* HELPERS
*/
/**
* RESOURCE RECORDS
*/
/*
* MDNSResponder::_readRRQuestion
*
* Reads a question (eg. MyESP._http._tcp.local ANY IN) from the UPD input buffer.
*
*/
bool MDNSResponder::_readRRQuestion(MDNSResponder::stcMDNS_RRQuestion& p_rRRQuestion) {
DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRQuestion\n")););
bool bResult = false;
if ((bResult = _readRRHeader(p_rRRQuestion.m_Header))) {
// Extract unicast flag from class field
p_rRRQuestion.m_bUnicast = (p_rRRQuestion.m_Header.m_Attributes.m_u16Class & 0x8000);
p_rRRQuestion.m_Header.m_Attributes.m_u16Class &= (~0x8000);
DEBUG_EX_INFO(
DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRQuestion "));
_printRRDomain(p_rRRQuestion.m_Header.m_Domain);
DEBUG_OUTPUT.printf(F(" Type:0x%04X Class:0x%04X %s\n"), (unsigned)p_rRRQuestion.m_Header.m_Attributes.m_u16Type, (unsigned)p_rRRQuestion.m_Header.m_Attributes.m_u16Class, (p_rRRQuestion.m_bUnicast ? "Unicast" : "Multicast"));
);
}
DEBUG_EX_ERR(if (!bResult) { DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRQuestion: FAILED!\n")); });
return bResult;
}
/*
* MDNSResponder::_readRRAnswer
*
* Reads an answer (eg. _http._tcp.local PTR OP TTL MyESP._http._tcp.local)
* from the UDP input buffer.
* After reading the domain and type info, the further processing of the answer
* is transferred the answer specific reading functions.
* Unknown answer types are processed by the generic answer reader (to remove them
* from the input buffer).
*
*/
bool MDNSResponder::_readRRAnswer(MDNSResponder::stcMDNS_RRAnswer*& p_rpRRAnswer) {
DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswer\n")););
bool bResult = false;
stcMDNS_RRHeader header;
uint32_t u32TTL;
uint16_t u16RDLength;
if ((_readRRHeader(header)) &&
(_udpRead32(u32TTL)) &&
(_udpRead16(u16RDLength))) {
DEBUG_EX_INFO(
DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswer: Reading 0x%04X answer (class:0x%04X, TTL:%u, RDLength:%u) for "), header.m_Attributes.m_u16Type, header.m_Attributes.m_u16Class, u32TTL, u16RDLength);
_printRRDomain(header.m_Domain);
DEBUG_OUTPUT.printf(F("\n"));
);
switch (header.m_Attributes.m_u16Type & (~0x8000)) { // Topmost bit might carry 'cache flush' flag
#ifdef MDNS_IP4_SUPPORT
case DNS_RRTYPE_A:
p_rpRRAnswer = new stcMDNS_RRAnswerA(header, u32TTL);
bResult = _readRRAnswerA(*(stcMDNS_RRAnswerA*&)p_rpRRAnswer, u16RDLength);
break;
#endif
case DNS_RRTYPE_PTR:
p_rpRRAnswer = new stcMDNS_RRAnswerPTR(header, u32TTL);
bResult = _readRRAnswerPTR(*(stcMDNS_RRAnswerPTR*&)p_rpRRAnswer, u16RDLength);
break;
case DNS_RRTYPE_TXT:
p_rpRRAnswer = new stcMDNS_RRAnswerTXT(header, u32TTL);
bResult = _readRRAnswerTXT(*(stcMDNS_RRAnswerTXT*&)p_rpRRAnswer, u16RDLength);
break;
#ifdef MDNS_IP6_SUPPORT
case DNS_RRTYPE_AAAA:
p_rpRRAnswer = new stcMDNS_RRAnswerAAAA(header, u32TTL);
bResult = _readRRAnswerAAAA(*(stcMDNS_RRAnswerAAAA*&)p_rpRRAnswer, u16RDLength);
break;
#endif
case DNS_RRTYPE_SRV:
p_rpRRAnswer = new stcMDNS_RRAnswerSRV(header, u32TTL);
bResult = _readRRAnswerSRV(*(stcMDNS_RRAnswerSRV*&)p_rpRRAnswer, u16RDLength);
break;
default:
p_rpRRAnswer = new stcMDNS_RRAnswerGeneric(header, u32TTL);
bResult = _readRRAnswerGeneric(*(stcMDNS_RRAnswerGeneric*&)p_rpRRAnswer, u16RDLength);
break;
}
DEBUG_EX_INFO(
if ((bResult) &&
(p_rpRRAnswer)) {
DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswer: "));
_printRRDomain(p_rpRRAnswer->m_Header.m_Domain);
DEBUG_OUTPUT.printf(F(" Type:0x%04X Class:0x%04X TTL:%u, RDLength:%u "), p_rpRRAnswer->m_Header.m_Attributes.m_u16Type, p_rpRRAnswer->m_Header.m_Attributes.m_u16Class, p_rpRRAnswer->m_u32TTL, u16RDLength);
switch (header.m_Attributes.m_u16Type & (~0x8000)) { // Topmost bit might carry 'cache flush' flag
#ifdef MDNS_IP4_SUPPORT
case DNS_RRTYPE_A:
DEBUG_OUTPUT.printf(F("A IP:%s"), ((stcMDNS_RRAnswerA*&)p_rpRRAnswer)->m_IPAddress.toString().c_str());
break;
#endif
case DNS_RRTYPE_PTR:
DEBUG_OUTPUT.printf(F("PTR "));
_printRRDomain(((stcMDNS_RRAnswerPTR*&)p_rpRRAnswer)->m_PTRDomain);
break;
case DNS_RRTYPE_TXT: {
size_t stTxtLength = ((stcMDNS_RRAnswerTXT*&)p_rpRRAnswer)->m_Txts.c_strLength();
char* pTxts = new char[stTxtLength];
if (pTxts) {
((stcMDNS_RRAnswerTXT*&)p_rpRRAnswer)->m_Txts.c_str(pTxts);
DEBUG_OUTPUT.printf(F("TXT(%u) %s"), stTxtLength, pTxts);
delete[] pTxts;
}
break;
}
#ifdef MDNS_IP6_SUPPORT
case DNS_RRTYPE_AAAA:
DEBUG_OUTPUT.printf(F("AAAA IP:%s"), ((stcMDNS_RRAnswerA*&)p_rpRRAnswer)->m_IPAddress.toString().c_str());
break;
#endif
case DNS_RRTYPE_SRV:
DEBUG_OUTPUT.printf(F("SRV Port:%u "), ((stcMDNS_RRAnswerSRV*&)p_rpRRAnswer)->m_u16Port);
_printRRDomain(((stcMDNS_RRAnswerSRV*&)p_rpRRAnswer)->m_SRVDomain);
break;
default:
DEBUG_OUTPUT.printf(F("generic "));
break;
}
DEBUG_OUTPUT.printf(F("\n"));
}
else {
DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswer: FAILED to read specific answer of type 0x%04X!\n"), p_rpRRAnswer->m_Header.m_Attributes.m_u16Type);
}
); // DEBUG_EX_INFO
}
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswer: FAILED!\n")););
return bResult;
}
#ifdef MDNS_IP4_SUPPORT
/*
* MDNSResponder::_readRRAnswerA
*/
bool MDNSResponder::_readRRAnswerA(MDNSResponder::stcMDNS_RRAnswerA& p_rRRAnswerA,
uint16_t p_u16RDLength) {
uint32_t u32IP4Address;
bool bResult = ((MDNS_IP4_SIZE == p_u16RDLength) &&
(_udpReadBuffer((unsigned char*)&u32IP4Address, MDNS_IP4_SIZE)) &&
((p_rRRAnswerA.m_IPAddress = IPAddress(u32IP4Address))));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerA: FAILED!\n")););
return bResult;
}
#endif
/*
* MDNSResponder::_readRRAnswerPTR
*/
bool MDNSResponder::_readRRAnswerPTR(MDNSResponder::stcMDNS_RRAnswerPTR& p_rRRAnswerPTR,
uint16_t p_u16RDLength) {
bool bResult = ((p_u16RDLength) &&
(_readRRDomain(p_rRRAnswerPTR.m_PTRDomain)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerPTR: FAILED!\n")););
return bResult;
}
/*
* MDNSResponder::_readRRAnswerTXT
*
* Read TXT items from a buffer like 4c#=15ff=20
*/
bool MDNSResponder::_readRRAnswerTXT(MDNSResponder::stcMDNS_RRAnswerTXT& p_rRRAnswerTXT,
uint16_t p_u16RDLength) {
DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerTXT: RDLength:%u\n"), p_u16RDLength););
bool bResult = true;
p_rRRAnswerTXT.clear();
if (p_u16RDLength) {
bResult = false;
unsigned char* pucBuffer = new unsigned char[p_u16RDLength];
if (pucBuffer) {
if (_udpReadBuffer(pucBuffer, p_u16RDLength)) {
bResult = true;
const unsigned char* pucCursor = pucBuffer;
while ((pucCursor < (pucBuffer + p_u16RDLength)) &&
(bResult)) {
bResult = false;
stcMDNSServiceTxt* pTxt = 0;
unsigned char ucLength = *pucCursor++; // Length of the next txt item
if (ucLength) {
DEBUG_EX_INFO(
static char sacBuffer[64]; *sacBuffer = 0;
uint8_t u8MaxLength = ((ucLength > (sizeof(sacBuffer) - 1)) ? (sizeof(sacBuffer) - 1) : ucLength);
os_strncpy(sacBuffer, (const char*)pucCursor, u8MaxLength); sacBuffer[u8MaxLength] = 0;
DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerTXT: Item(%u): %s\n"), ucLength, sacBuffer);
);
unsigned char* pucEqualSign = (unsigned char*)os_strchr((const char*)pucCursor, '='); // Position of the '=' sign
unsigned char ucKeyLength;
if ((pucEqualSign) &&
((ucKeyLength = (pucEqualSign - pucCursor)))) {
unsigned char ucValueLength = (ucLength - (pucEqualSign - pucCursor + 1));
bResult = (((pTxt = new stcMDNSServiceTxt)) &&
(pTxt->setKey((const char*)pucCursor, ucKeyLength)) &&
(pTxt->setValue((const char*)(pucEqualSign + 1), ucValueLength)));
}
else {
DEBUG_EX_ERR(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerTXT: INVALID TXT format (No '=')!\n")););
}
pucCursor += ucLength;
}
else { // no/zero length TXT
DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerTXT: TXT answer contains no items.\n")););
bResult = true;
}
if ((bResult) &&
(pTxt)) { // Everythings fine so far
// Link TXT item to answer TXTs
pTxt->m_pNext = p_rRRAnswerTXT.m_Txts.m_pTxts;
p_rRRAnswerTXT.m_Txts.m_pTxts = pTxt;
}
else { // At least no TXT (migth be OK, if length was 0) OR an error
if (!bResult) {
DEBUG_EX_ERR(
DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerTXT: FAILED to read TXT item!\n"));
DEBUG_OUTPUT.printf(F("RData dump:\n"));
_udpDump((m_pUDPContext->tell() - p_u16RDLength), p_u16RDLength);
DEBUG_OUTPUT.printf(F("\n"));
);
}
if (pTxt) {
delete pTxt;
pTxt = 0;
}
p_rRRAnswerTXT.clear();
}
} // while
DEBUG_EX_ERR(
if (!bResult) { // Some failure
DEBUG_OUTPUT.printf(F("RData dump:\n"));
_udpDump((m_pUDPContext->tell() - p_u16RDLength), p_u16RDLength);
DEBUG_OUTPUT.printf(F("\n"));
}
);
}
else {
DEBUG_EX_ERR(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerTXT: FAILED to read TXT content!\n")););
}
// Clean up
delete[] pucBuffer;
}
else {
DEBUG_EX_ERR(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerTXT: FAILED to alloc buffer for TXT content!\n")););
}
}
else {
DEBUG_EX_ERR(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerTXT: WARNING! No content!\n")););
}
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerTXT: FAILED!\n")););
return bResult;
}
#ifdef MDNS_IP6_SUPPORT
bool MDNSResponder::_readRRAnswerAAAA(MDNSResponder::stcMDNS_RRAnswerAAAA& p_rRRAnswerAAAA,
uint16_t p_u16RDLength) {
bool bResult = false;
// TODO: Implement
return bResult;
}
#endif
/*
* MDNSResponder::_readRRAnswerSRV
*/
bool MDNSResponder::_readRRAnswerSRV(MDNSResponder::stcMDNS_RRAnswerSRV& p_rRRAnswerSRV,
uint16_t p_u16RDLength) {
bool bResult = (((3 * sizeof(uint16_t)) < p_u16RDLength) &&
(_udpRead16(p_rRRAnswerSRV.m_u16Priority)) &&
(_udpRead16(p_rRRAnswerSRV.m_u16Weight)) &&
(_udpRead16(p_rRRAnswerSRV.m_u16Port)) &&
(_readRRDomain(p_rRRAnswerSRV.m_SRVDomain)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerSRV: FAILED!\n")););
return bResult;
}
/*
* MDNSResponder::_readRRAnswerGeneric
*/
bool MDNSResponder::_readRRAnswerGeneric(MDNSResponder::stcMDNS_RRAnswerGeneric& p_rRRAnswerGeneric,
uint16_t p_u16RDLength) {
bool bResult = (0 == p_u16RDLength);
p_rRRAnswerGeneric.clear();
if (((p_rRRAnswerGeneric.m_u16RDLength = p_u16RDLength)) &&
((p_rRRAnswerGeneric.m_pu8RDData = new unsigned char[p_rRRAnswerGeneric.m_u16RDLength]))) {
bResult = _udpReadBuffer(p_rRRAnswerGeneric.m_pu8RDData, p_rRRAnswerGeneric.m_u16RDLength);
}
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAnswerGeneric: FAILED!\n")););
return bResult;
}
/*
* MDNSResponder::_readRRHeader
*/
bool MDNSResponder::_readRRHeader(MDNSResponder::stcMDNS_RRHeader& p_rRRHeader) {
//DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRHeader\n")););
bool bResult = ((_readRRDomain(p_rRRHeader.m_Domain)) &&
(_readRRAttributes(p_rRRHeader.m_Attributes)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRHeader: FAILED!\n")););
return bResult;
}
/*
* MDNSResponder::_readRRDomain
*
* Reads a (maybe multilevel compressed) domain from the UDP input buffer.
*
*/
bool MDNSResponder::_readRRDomain(MDNSResponder::stcMDNS_RRDomain& p_rRRDomain) {
//DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRDomain\n")););
bool bResult = ((p_rRRDomain.clear()) &&
(_readRRDomain_Loop(p_rRRDomain, 0)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRDomain: FAILED!\n")););
return bResult;
}
/*
* MDNSResponder::_readRRDomain_Loop
*
* Reads a domain from the UDP input buffer. For every compression level, the functions
* calls itself recursively. To avoid endless recursion because of malformed MDNS records,
* the maximum recursion depth is set by MDNS_DOMAIN_MAX_REDIRCTION.
*
*/
bool MDNSResponder::_readRRDomain_Loop(MDNSResponder::stcMDNS_RRDomain& p_rRRDomain,
uint8_t p_u8Depth) {
//DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRDomain_Loop(%u)\n"), p_u8Depth););
bool bResult = false;
if (MDNS_DOMAIN_MAX_REDIRCTION >= p_u8Depth) {
bResult = true;
uint8_t u8Len = 0;
do {
//DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRDomain_Loop(%u): Offset:%u p0:%02x\n"), p_u8Depth, m_pUDPContext->tell(), m_pUDPContext->peek()););
_udpRead8(u8Len);
if (u8Len & MDNS_DOMAIN_COMPRESS_MARK) {
// Compressed label(s)
uint16_t u16Offset = ((u8Len & ~MDNS_DOMAIN_COMPRESS_MARK) << 8); // Implicit BE to LE conversion!
_udpRead8(u8Len);
u16Offset |= u8Len;
if (m_pUDPContext->isValidOffset(u16Offset)) {
size_t stCurrentPosition = m_pUDPContext->tell(); // Prepare return from recursion
//DEBUG_EX_RX(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRDomain_Loop(%u): Redirecting from %u to %u!\n"), p_u8Depth, stCurrentPosition, u16Offset););
m_pUDPContext->seek(u16Offset);
if (_readRRDomain_Loop(p_rRRDomain, p_u8Depth + 1)) { // Do recursion
//DEBUG_EX_RX(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRDomain_Loop(%u): Succeeded to read redirected label! Returning to %u\n"), p_u8Depth, stCurrentPosition););
m_pUDPContext->seek(stCurrentPosition); // Restore after recursion
}
else {
DEBUG_EX_ERR(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRDomain_Loop(%u): FAILED to read redirected label!\n"), p_u8Depth););
bResult = false;
}
}
else {
DEBUG_EX_ERR(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRDomain_Loop(%u): INVALID offset in redirection!\n"), p_u8Depth););
bResult = false;
}
break;
}
else {
// Normal (uncompressed) label (maybe '\0' only)
if (MDNS_DOMAIN_MAXLENGTH > (p_rRRDomain.m_u16NameLength + u8Len)) {
// Add length byte
p_rRRDomain.m_acName[p_rRRDomain.m_u16NameLength] = u8Len;
++(p_rRRDomain.m_u16NameLength);
if (u8Len) { // Add name
if ((bResult = _udpReadBuffer((unsigned char*)&(p_rRRDomain.m_acName[p_rRRDomain.m_u16NameLength]), u8Len))) {
/*DEBUG_EX_INFO(
p_rRRDomain.m_acName[p_rRRDomain.m_u16NameLength + u8Len] = 0; // Closing '\0' for printing
DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRDomain_Loop(%u): Domain label (%u): %s\n"), p_u8Depth, (unsigned)(p_rRRDomain.m_acName[p_rRRDomain.m_u16NameLength - 1]), &(p_rRRDomain.m_acName[p_rRRDomain.m_u16NameLength]));
);*/
p_rRRDomain.m_u16NameLength += u8Len;
}
}
//DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRDomain_Loop(2) offset:%u p0:%x\n"), m_pUDPContext->tell(), m_pUDPContext->peek()););
}
else {
DEBUG_EX_ERR(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRDomain_Loop(%u): ERROR! Domain name too long (%u + %u)!\n"), p_u8Depth, p_rRRDomain.m_u16NameLength, u8Len););
bResult = false;
break;
}
}
} while ((bResult) &&
(0 != u8Len));
}
else {
DEBUG_EX_ERR(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRDomain_Loop(%u): ERROR! Too many redirections!\n"), p_u8Depth););
}
return bResult;
}
/*
* MDNSResponder::_readRRAttributes
*/
bool MDNSResponder::_readRRAttributes(MDNSResponder::stcMDNS_RRAttributes& p_rRRAttributes) {
//DEBUG_EX_INFO(DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAttributes\n")););
bool bResult = ((_udpRead16(p_rRRAttributes.m_u16Type)) &&
(_udpRead16(p_rRRAttributes.m_u16Class)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _readRRAttributes: FAILED!\n")););
return bResult;
}
/*
* DOMAIN NAMES
*/
/*
* MDNSResponder::_buildDomainForHost
*
* Builds a MDNS host domain (eg. esp8266.local) for the given hostname.
*
*/
bool MDNSResponder::_buildDomainForHost(const char* p_pcHostname,
MDNSResponder::stcMDNS_RRDomain& p_rHostDomain) const {
p_rHostDomain.clear();
bool bResult = ((p_pcHostname) &&
(*p_pcHostname) &&
(p_rHostDomain.addLabel(p_pcHostname)) &&
(p_rHostDomain.addLabel(scpcLocal)) &&
(p_rHostDomain.addLabel(0)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _buildDomainForHost: FAILED!\n")););
return bResult;
}
/*
* MDNSResponder::_buildDomainForDNSSD
*
* Builds the '_services._dns-sd._udp.local' domain.
* Used while detecting generic service enum question (DNS-SD) and answering these questions.
*
*/
bool MDNSResponder::_buildDomainForDNSSD(MDNSResponder::stcMDNS_RRDomain& p_rDNSSDDomain) const {
p_rDNSSDDomain.clear();
bool bResult = ((p_rDNSSDDomain.addLabel(scpcServices, true)) &&
(p_rDNSSDDomain.addLabel(scpcDNSSD, true)) &&
(p_rDNSSDDomain.addLabel(scpcUDP, true)) &&
(p_rDNSSDDomain.addLabel(scpcLocal)) &&
(p_rDNSSDDomain.addLabel(0)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _buildDomainForDNSSD: FAILED!\n")););
return bResult;
}
/*
* MDNSResponder::_buildDomainForService
*
* Builds the domain for the given service (eg. _http._tcp.local or
* MyESP._http._tcp.local (if p_bIncludeName is set)).
*
*/
bool MDNSResponder::_buildDomainForService(const MDNSResponder::stcMDNSService& p_Service,
bool p_bIncludeName,
MDNSResponder::stcMDNS_RRDomain& p_rServiceDomain) const {
p_rServiceDomain.clear();
bool bResult = (((!p_bIncludeName) ||
(p_rServiceDomain.addLabel(p_Service.m_pcName))) &&
(p_rServiceDomain.addLabel(p_Service.m_pcService, true)) &&
(p_rServiceDomain.addLabel(p_Service.m_pcProtocol, true)) &&
(p_rServiceDomain.addLabel(scpcLocal)) &&
(p_rServiceDomain.addLabel(0)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _buildDomainForService: FAILED!\n")););
return bResult;
}
/*
* MDNSResponder::_buildDomainForService
*
* Builds the domain for the given service properties (eg. _http._tcp.local).
* The usual prepended '_' are added, if missing in the input strings.
*
*/
bool MDNSResponder::_buildDomainForService(const char* p_pcService,
const char* p_pcProtocol,
MDNSResponder::stcMDNS_RRDomain& p_rServiceDomain) const {
p_rServiceDomain.clear();
bool bResult = ((p_pcService) &&
(p_pcProtocol) &&
(p_rServiceDomain.addLabel(p_pcService, ('_' != *p_pcService))) &&
(p_rServiceDomain.addLabel(p_pcProtocol, ('_' != *p_pcProtocol))) &&
(p_rServiceDomain.addLabel(scpcLocal)) &&
(p_rServiceDomain.addLabel(0)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _buildDomainForService: FAILED for (%s.%s)!\n"), (p_pcService ?: "-"), (p_pcProtocol ?: "-")););
return bResult;
}
#ifdef MDNS_IP4_SUPPORT
/*
* MDNSResponder::_buildDomainForReverseIP4
*
* The IP4 address is stringized by printing the four address bytes into a char buffer in reverse order
* and adding 'in-addr.arpa' (eg. 012.789.456.123.in-addr.arpa).
* Used while detecting reverse IP4 questions and answering these
*/
bool MDNSResponder::_buildDomainForReverseIP4(IPAddress p_IP4Address,
MDNSResponder::stcMDNS_RRDomain& p_rReverseIP4Domain) const {
bool bResult = true;
p_rReverseIP4Domain.clear();
char acBuffer[32];
for (int i=MDNS_IP4_SIZE; ((bResult) && (i>=1)); --i) {
itoa(p_IP4Address[i - 1], acBuffer, 10);
bResult = p_rReverseIP4Domain.addLabel(acBuffer);
}
bResult = ((bResult) &&
(p_rReverseIP4Domain.addLabel(scpcReverseIP4Domain)) &&
(p_rReverseIP4Domain.addLabel(scpcReverseTopDomain)) &&
(p_rReverseIP4Domain.addLabel(0)));
DEBUG_EX_ERR(if (!bResult) DEBUG_OUTPUT.printf(F("[MDNSResponder] _buildDomainForReverseIP4: FAILED!\n")););
return bResult;
}
#endif
#ifdef MDNS_IP6_SUPPORT
/*
* MDNSResponder::_buildDomainForReverseIP6
*
* Used while detecting reverse IP6 questions and answering these
*/
bool MDNSResponder::_buildDomainForReverseIP6(IPAddress p_IP4Address,
MDNSResponder::stcMDNS_RRDomain& p_rReverseIP6Domain) const {
// TODO: Implement
return false;
}
#endif
/*
* UDP
*/
/*
* MDNSResponder::_udpReadBuffer
*/
bool MDNSResponder::_udpReadBuffer(unsigned char* p_pBuffer,
size_t p_stLength) {
bool bResult = ((m_pUDPContext) &&
(true/*m_pUDPContext->getSize() > p_stLength*/) &&
(p_pBuffer) &&
(p_stLength) &&
((p_stLength == m_pUDPContext->read((char*)p_pBuffer, p_stLength))));
DEBUG_EX_ERR(if (!bResult) { DEBUG_OUTPUT.printf(F("[MDNSResponder] _udpReadBuffer: FAILED!\n")); });
return bResult;
}
/*
* MDNSResponder::_udpRead8
*/
bool MDNSResponder::_udpRead8(uint8_t& p_ru8Value) {
return _udpReadBuffer((unsigned char*)&p_ru8Value, sizeof(p_ru8Value));
}
/*
* MDNSResponder::_udpRead16
*/
bool MDNSResponder::_udpRead16(uint16_t& p_ru16Value) {