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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| #include <ESP8266WiFi.h> | ||
| #include <DNSServer.h> | ||
|
|
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| const byte DNS_PORT = 53; | ||
| IPAddress apIP(192, 168, 1, 1); | ||
| DNSServer dnsServer; | ||
|
|
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| void setup() { | ||
| WiFi.mode(WIFI_AP); | ||
| WiFi.softAPConfig(apIP, apIP, IPAddress(255, 255, 255, 0)); | ||
| WiFi.softAP("DNSServer example"); | ||
|
|
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| // modify TTL associated with the domain name (in seconds) | ||
| // default is 60 seconds | ||
| dnsServer.setTTL(300); | ||
| // set which return code will be used for all other domains (e.g. sending | ||
| // ServerFailure instead of NonExistentDomain will reduce number of queries | ||
| // sent by clients) | ||
| // default is DNSReplyCode::NonExistentDomain | ||
| dnsServer.setErrorReplyCode(DNSReplyCode::ServerFailure); | ||
|
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| //start DNS server for a specific domain name | ||
| dnsServer.start(DNS_PORT, "www.example.com", apIP); | ||
| } | ||
|
|
||
| void loop() { | ||
| dnsServer.processNextRequest(); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| name=DNSServer | ||
| version=1.0.0 | ||
| author=Kristijan Novoselić | ||
| maintainer=Kristijan Novoselić, <kristijan.novoselic@gmail.com> | ||
| sentence=A simple DNS server for ESP8266. | ||
| paragraph=This library implements a simple DNS server. | ||
| category=Communication | ||
| url= | ||
| architectures=esp8266 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| #include "DNSServer.h" | ||
| #include <lwip/def.h> | ||
| #include <Arduino.h> | ||
|
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| DNSServer::DNSServer() | ||
| { | ||
| _ttl = htonl(60); | ||
| _errorReplyCode = DNSReplyCode::NonExistentDomain; | ||
| } | ||
|
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| bool DNSServer::start(const uint16_t &port, const String &domainName, | ||
| const IPAddress &resolvedIP) | ||
| { | ||
| _port = port; | ||
| _domainName = domainName; | ||
| _resolvedIP[0] = resolvedIP[0]; | ||
| _resolvedIP[1] = resolvedIP[1]; | ||
| _resolvedIP[2] = resolvedIP[2]; | ||
| _resolvedIP[3] = resolvedIP[3]; | ||
| downcaseAndRemoveWwwPrefix(_domainName); | ||
| return _udp.begin(_port) == 1; | ||
| } | ||
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| void DNSServer::setErrorReplyCode(const DNSReplyCode &replyCode) | ||
| { | ||
| _errorReplyCode = replyCode; | ||
| } | ||
|
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| void DNSServer::setTTL(const uint32_t &ttl) | ||
| { | ||
| _ttl = htonl(ttl); | ||
| } | ||
|
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| void DNSServer::stop() | ||
| { | ||
| _udp.stop(); | ||
| } | ||
|
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| void DNSServer::downcaseAndRemoveWwwPrefix(String &domainName) | ||
| { | ||
| domainName.toLowerCase(); | ||
| domainName.replace("www.", ""); | ||
| } | ||
|
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| void DNSServer::processNextRequest() | ||
| { | ||
| _currentPacketSize = _udp.parsePacket(); | ||
| if (_currentPacketSize) | ||
| { | ||
| _buffer = (unsigned char*)malloc(_currentPacketSize * sizeof(char)); | ||
| _udp.read(_buffer, _currentPacketSize); | ||
| _dnsHeader = (DNSHeader*) _buffer; | ||
|
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| if (_dnsHeader->QR == DNS_QR_QUERY && | ||
| _dnsHeader->OPCode == DNS_OPCODE_QUERY && | ||
| requestIncludesOnlyOneQuestion() && | ||
| getDomainNameWithoutWwwPrefix() == _domainName) | ||
| { | ||
| replyWithIP(); | ||
| } | ||
| else if (_dnsHeader->QR == DNS_QR_QUERY) | ||
| { | ||
| replyWithCustomCode(); | ||
| } | ||
|
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| free(_buffer); | ||
| } | ||
| } | ||
|
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| bool DNSServer::requestIncludesOnlyOneQuestion() | ||
| { | ||
| return ntohs(_dnsHeader->QDCount) == 1 && | ||
| _dnsHeader->ANCount == 0 && | ||
| _dnsHeader->NSCount == 0 && | ||
| _dnsHeader->ARCount == 0; | ||
| } | ||
|
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| String DNSServer::getDomainNameWithoutWwwPrefix() | ||
| { | ||
| String parsedDomainName = ""; | ||
| unsigned char *start = _buffer + 12; | ||
| if (*start == 0) | ||
| { | ||
| return parsedDomainName; | ||
| } | ||
| int pos = 0; | ||
| while(true) | ||
| { | ||
| unsigned char labelLength = *(start + pos); | ||
| for(int i = 0; i < labelLength; i++) | ||
| { | ||
| pos++; | ||
| parsedDomainName += (char)*(start + pos); | ||
| } | ||
| pos++; | ||
| if (*(start + pos) == 0) | ||
| { | ||
| downcaseAndRemoveWwwPrefix(parsedDomainName); | ||
| return parsedDomainName; | ||
| } | ||
| else | ||
| { | ||
| parsedDomainName += "."; | ||
| } | ||
| } | ||
| } | ||
|
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| void DNSServer::replyWithIP() | ||
| { | ||
| _dnsHeader->QR = DNS_QR_RESPONSE; | ||
| _dnsHeader->ANCount = _dnsHeader->QDCount; | ||
| _dnsHeader->QDCount = 0; | ||
|
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| _udp.beginPacket(_udp.remoteIP(), _udp.remotePort()); | ||
| _udp.write(_buffer, _currentPacketSize); | ||
| _udp.write((unsigned char*)&_ttl, 4); | ||
| // Length of RData is 4 bytes (because, in this case, RData is IPv4) | ||
| _udp.write((uint8_t)0); | ||
| _udp.write((uint8_t)4); | ||
| _udp.write(_resolvedIP, sizeof(_resolvedIP)); | ||
| _udp.endPacket(); | ||
| } | ||
|
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| void DNSServer::replyWithCustomCode() | ||
| { | ||
| _dnsHeader->QR = DNS_QR_RESPONSE; | ||
| _dnsHeader->RCode = (unsigned char)_errorReplyCode; | ||
| _dnsHeader->QDCount = 0; | ||
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| _udp.beginPacket(_udp.remoteIP(), _udp.remotePort()); | ||
| _udp.write(_buffer, sizeof(DNSHeader)); | ||
| _udp.endPacket(); | ||
| } |
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