我尝试用netty编写一个简单的DNS服务器。当我使用dig命令时，它将返回正确的结果，但是当我将DNS服务器更改为我的服务器并使用浏览器访问域时，它将失败。我认为浏览器无法从DNS服务器获取IP地址。
我的IP为const a = [1,2]
const b = [3,4]
const c = [5,6]
a.push(...b, ...c)
console.log(a) // return [1,2,3,4,5,6]
。我在端口80上打开了一个Web服务器，并尝试使用我的浏览器访问192.168.43.245（返回aaa.1.tqtqtq.aaa的测试域），但无法连接。
192.168.43.245这是我的挖掘结果
public void channelRead0(ChannelHandlerContext ctx, DatagramDnsQuery query){
ByteBuf answerIP;
int logID;
DatagramDnsResponse response = new DatagramDnsResponse(query.recipient(), query.sender(), query.id());
DefaultDnsQuestion dnsQuestion = query.recordAt(DnsSection.QUESTION);
String connectIP = query.sender().getHostName();
String domainRegex = "\\.\\d+\\."+domain.replace(".","\\.")+"\\.$";
String subDomain = dnsQuestion.name().replaceAll(domainRegex,"");
String[] hd = dnsQuestion.name().replace('.'+domain+'.',"").split("\\.");
try{
logID = Integer.parseInt(hd[hd.length-1]);
}catch (NumberFormatException n){
return;
}
String ipRegex = "^((2(5[0-5]|[0-4]\\d))|[0-1]?\\d{1,2})(\\.((2(5[0-5]|[0-4]\\d))|[0-1]?\\d{1,2})){3}$";
String rebindRegex = "^((2(5[0-5]|[0-4]\\d))|[0-1]?\\d{1,2})(\\.((2(5[0-5]|[0-4]\\d))|[0-1]?\\d{1,2})){3}\\.((2(5[0-5]|[0-4]\\d))|[0-1]?\\d{1,2})(\\.((2(5[0-5]|[0-4]\\d))|[0-1]?\\d{1,2})){3}$";
if(Pattern.compile(rebindRegex).matcher(subDomain).matches()) {
String[] s = subDomain.split("\\.");
byte[] ip = new byte[4];
byte[] rebindIP = new byte[4];
for (int i = 0; i < s.length; i++) {
if (i < 4) {
ip[i] = (byte) Integer.parseInt(s[i]);
} else {
rebindIP[i - 4] = (byte) Integer.parseInt(s[i]);
}
}
if (questionDomainMap.containsKey(dnsQuestion.name())) {
answerIP = Unpooled.wrappedBuffer(questionDomainMap.get(dnsQuestion.name()));
questionDomainMap.remove(dnsQuestion.name());
} else {
answerIP = Unpooled.wrappedBuffer(ip);
questionDomainMap.put(dnsQuestion.name(), rebindIP);
}
}else if(Pattern.compile(ipRegex).matcher(subDomain).matches()){
String[] s = subDomain.split("\\.");
byte[] ip = new byte[s.length];
for(int i=0; i < s.length; i++){
ip[i] = (byte)Integer.parseInt(s[i]);
}
answerIP = Unpooled.wrappedBuffer(ip);
}else{
answerIP = Unpooled.wrappedBuffer(new byte[] {(byte) 192, (byte) 168, 43, (byte)245});
System.out.println(dnsQuestion.name());
System.out.println(1);
}
DnsLog dnslog = new DnsLog(UUID.randomUUID().toString(),dnsQuestion.name().substring(0,dnsQuestion.name().length()-1),new Timestamp(System.currentTimeMillis()),connectIP,dnsQuestion.type().toString(),logID);
dnsLogService.addDnsLog(dnslog);
response.addRecord(DnsSection.QUESTION, dnsQuestion);
DefaultDnsRawRecord queryAnswer = new DefaultDnsRawRecord(dnsQuestion.name(), DnsRecordType.A, 0, answerIP);
response.addRecord(DnsSection.ANSWER, queryAnswer);
ctx.writeAndFlush(response);
我尝试在dig aaa.1.tqtqtq.aaa @127.0.0.1
; <<>> DiG 9.10.6 <<>> aaa.1.tqtqtq.aaa @127.0.0.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57548
;; flags: qr; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;aaa.1.tqtqtq.aaa. IN A
;; ANSWER SECTION:
aaa.1.tqtqtq.aaa. 0 IN A 192.168.43.245
;; Query time: 5 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Jul 18 21:24:32 CST 2019
;; MSG SIZE rcvd: 66
上使用浏览器连接，DNS服务器向浏览器返回了一条消息，但浏览器连接错误。
当我使用nslookup时，它给了我这个：
aaa.1.tqtqtq.aaa我的代码可能有错误，但我不知道。