awl/lib/response.ts
Sam Therapy 6f4ae7de65
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Signed-off-by: Sam Therapy <sam@samtherapy.net>
2022-06-18 20:11:46 +02:00

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3.2 KiB
TypeScript

// SPDX-License-Identifier: MIT
import {
isCAA,
isMX,
isNAPTR,
isSOA,
isSRV,
isTXT,
QueryResponse,
} from "./utils.ts";
/**
* @param res A DNS {@link QueryResponse}
* @param domain The domain (or IP, if doing it in reverse) queried
* @param query The DNS query that was queried
* @returns {string} The DNS response, put in canonical form
*/
export function parseResponse(
res: QueryResponse,
domain: string,
query: string,
short: boolean,
): string[] {
const answer: string[] = [];
switch (query) {
case "A":
case "AAAA":
case "CNAME":
case "NS":
case "PTR":
res.dnsResponse.forEach((ip) => {
let dnsQuery = "";
if (!short) dnsQuery += `${domain} IN ${query} `;
dnsQuery += `${ip}`;
answer.push(dnsQuery);
});
break;
case "MX":
if (isMX(res.dnsResponse)) {
res.dnsResponse.forEach((record) => {
let dnsQuery = "";
if (!short) {
dnsQuery += `${domain} IN ${query} `;
}
dnsQuery += `${record.preference} ${record.exchange}`;
answer.push(dnsQuery);
});
}
break;
case "CAA":
if (isCAA(res.dnsResponse)) {
res.dnsResponse.forEach((record) => {
let dnsQuery = "";
if (!short) {
dnsQuery += `${domain} IN ${query} `;
}
dnsQuery += `${
record.critical ? "1" : "0"
} ${record.tag} "${record.value}"`;
answer.push(dnsQuery);
});
}
break;
case "NAPTR":
if (isNAPTR(res.dnsResponse)) {
res.dnsResponse.forEach((record) => {
let dnsQuery = "";
if (!short) dnsQuery += `${domain} IN ${query} `;
dnsQuery +=
`${record.order} ${record.preference} "${record.flags}" "${record.services}" ${record.regexp} ${record.replacement}`;
answer.push(dnsQuery);
});
}
break;
case "SOA":
if (isSOA(res.dnsResponse)) {
res.dnsResponse.forEach((record) => {
let dnsQuery = "";
if (!short) dnsQuery += `${domain} IN ${query} `;
dnsQuery +=
`${record.mname} ${record.rname} ${record.serial} ${record.refresh} ${record.retry} ${record.expire} ${record.minimum}`;
answer.push(dnsQuery);
});
}
break;
case "SRV":
if (isSRV(res.dnsResponse)) {
res.dnsResponse.forEach((record) => {
let dnsQuery = "";
if (!short) dnsQuery += `${domain} IN ${query} `;
dnsQuery +=
`${record.priority} ${record.weight} ${record.port} ${record.target}`;
answer.push(dnsQuery);
});
}
break;
case "TXT":
if (isTXT(res.dnsResponse)) {
res.dnsResponse.forEach((record) => {
let dnsQuery = "";
let txt = "";
record.forEach((value) => {
txt += `"${value}"`;
});
if (!short) {
dnsQuery += `${domain} IN ${query} `;
}
dnsQuery += `${txt}`;
answer.push(dnsQuery);
});
}
break;
default:
throw new Error("Not yet implemented");
}
return answer;
}