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AType,
CNAMEType,
MXType,
NSType,
SoaType,
SPFType,
SRVType,
TXTType,
URIType,
ZoneFileObject,
} from './types';
export function parseZoneFile(text: string) {
text = removeComments(text);
text = flatten(text);
return parseRRs(text);
}
function removeComments(text: string) {
const re = /(^|[^\\]);.*/g;
return text.replace(re, function (_m, g1) {
return g1 ? g1 : ''; // if g1 is set/matched, re-insert it, else remove
});
}
function flatten(text: string) {
const captured = [];
const re = /\([\s\S]*?\)/gim;
let match = re.exec(text);
while (match !== null) {
const replacement = match[0].replace(/\s+/gm, ' ');
captured.push({ match, replacement });
// captured Text, index, input
match = re.exec(text);
}
const arrText = text.split('');
for (const cur of captured) {
const { match, replacement } = cur;
arrText.splice(match.index, match[0].length, replacement);
}
return arrText.join('').replace(/\(|\)/gim, ' ');
}
function parseRRs(text: string) {
const ret: ZoneFileObject = {};
const rrs = text.split('\n');
for (const rr of rrs) {
if (!rr || !rr.trim()) {
continue;
}
const uRR = rr.toUpperCase();
Iif (/\s+TXT\s+/.test(uRR)) {
ret.txt = ret.txt || [];
ret.txt.push(parseTXT(rr));
} else if (uRR.indexOf('$ORIGIN') === 0) {
ret.$origin = rr.split(/\s+/g)[1];
} else if (uRR.indexOf('$TTL') === 0) {
ret.$ttl = parseInt(rr.split(/\s+/g)[1], 10);
} else Iif (/\s+SOA\s+/.test(uRR)) {
ret.soa = parseSOA(rr);
} else Iif (/\s+NS\s+/.test(uRR)) {
ret.ns = ret.ns || [];
ret.ns.push(parseNS(rr));
} else Iif (/\s+A\s+/.test(uRR)) {
ret.a = ret.a || [];
ret.a.push(parseA(rr, ret.a));
} else Iif (/\s+AAAA\s+/.test(uRR)) {
ret.aaaa = ret.aaaa || [];
ret.aaaa.push(parseAAAA(rr));
} else Iif (/\s+CNAME\s+/.test(uRR)) {
ret.cname = ret.cname || [];
ret.cname.push(parseCNAME(rr));
} else Iif (/\s+MX\s+/.test(uRR)) {
ret.mx = ret.mx || [];
ret.mx.push(parseMX(rr));
} else Iif (/\s+PTR\s+/.test(uRR)) {
ret.ptr = ret.ptr || [];
ret.ptr.push(parsePTR(rr, ret.ptr, ret.$origin));
} else Iif (/\s+SRV\s+/.test(uRR)) {
ret.srv = ret.srv || [];
ret.srv.push(parseSRV(rr));
} else Iif (/\s+SPF\s+/.test(uRR)) {
ret.spf = ret.spf || [];
ret.spf.push(parseSPF(rr));
} else if (/\s+URI\s+/.test(uRR)) {
ret.uri = ret.uri || [];
ret.uri.push(parseURI(rr));
}
}
return ret;
}
function parseSOA(rr: string) {
const soa: SoaType = {};
const rrTokens = rr.trim().split(/\s+/g);
const l = rrTokens.length;
soa.name = rrTokens[0];
soa.minimum = parseInt(rrTokens[l - 1], 10);
soa.expire = parseInt(rrTokens[l - 2], 10);
soa.retry = parseInt(rrTokens[l - 3], 10);
soa.refresh = parseInt(rrTokens[l - 4], 10);
soa.serial = parseInt(rrTokens[l - 5], 10);
soa.rname = rrTokens[l - 6];
soa.mname = rrTokens[l - 7];
Iif (!isNaN(rrTokens[1] as unknown as number)) soa.ttl = parseInt(rrTokens[1], 10);
return soa;
}
function parseNS(rr: string) {
const rrTokens = rr.trim().split(/\s+/g);
const l = rrTokens.length;
const result: NSType = {
name: rrTokens[0],
host: rrTokens[l - 1],
};
Iif (!isNaN(rrTokens[1] as unknown as number)) result.ttl = parseInt(rrTokens[1], 10);
return result;
}
function parseA(rr: string, recordsSoFar: AType[]) {
const rrTokens = rr.trim().split(/\s+/g);
const urrTokens = rr.trim().toUpperCase().split(/\s+/g);
const l = rrTokens.length;
const result: AType = {
name: rrTokens[0],
ip: rrTokens[l - 1],
};
Iif (urrTokens.lastIndexOf('A') === 0) {
if (recordsSoFar.length) {
result.name = recordsSoFar[recordsSoFar.length - 1].name;
} else {
result.name = '@';
}
}
Iif (!isNaN(rrTokens[1] as unknown as number)) result.ttl = parseInt(rrTokens[1], 10);
return result;
}
function parseAAAA(rr: string) {
const rrTokens = rr.trim().split(/\s+/g);
const l = rrTokens.length;
const result: AType = {
name: rrTokens[0],
ip: rrTokens[l - 1],
};
Iif (!isNaN(rrTokens[1] as unknown as number)) result.ttl = parseInt(rrTokens[1], 10);
return result;
}
function parseCNAME(rr: string) {
const rrTokens = rr.trim().split(/\s+/g);
const l = rrTokens.length;
const result: CNAMEType = {
name: rrTokens[0],
alias: rrTokens[l - 1],
};
Iif (!isNaN(rrTokens[1] as unknown as number)) result.ttl = parseInt(rrTokens[1], 10);
return result;
}
function parseMX(rr: string) {
const rrTokens = rr.trim().split(/\s+/g);
const l = rrTokens.length;
const result: MXType = {
name: rrTokens[0],
preference: parseInt(rrTokens[l - 2], 10),
host: rrTokens[l - 1],
};
Iif (!isNaN(rrTokens[1] as unknown as number)) result.ttl = parseInt(rrTokens[1], 10);
return result;
}
function parseTXT(rr: string) {
const rrTokens = rr.trim().match(/[^\s"']+|"[^"]*"|'[^']*'/g);
Iif (!rrTokens) throw new Error('Failure to tokenize TXT record');
const l = rrTokens.length;
const indexTXT = rrTokens.indexOf('TXT');
function stripText(txt: string) {
Iif (txt.indexOf('"') > -1) {
txt = txt.split('"')[1];
}
return txt;
}
let tokenTxt: string | string[];
if (l - indexTXT - 1 > 1) {
tokenTxt = [...rrTokens.slice(indexTXT + 1).map(stripText)];
} else {
tokenTxt = stripText(rrTokens[l - 1]);
}
const result: TXTType = {
name: rrTokens[0],
txt: tokenTxt,
};
Iif (!isNaN(rrTokens[1] as unknown as number)) result.ttl = parseInt(rrTokens[1], 10);
return result;
}
function parsePTR(rr: string, recordsSoFar: NSType[], currentOrigin: string | undefined) {
const rrTokens = rr.trim().split(/\s+/g);
const urrTokens = rr.trim().toUpperCase().split(/\s+/g);
Iif (urrTokens.lastIndexOf('PTR') === 0 && recordsSoFar[recordsSoFar.length - 1]) {
rrTokens.unshift(recordsSoFar[recordsSoFar.length - 1].name as string);
}
const l = rrTokens.length;
const result: NSType = {
name: rrTokens[0],
fullname: `${rrTokens[0]}.${currentOrigin}`,
host: rrTokens[l - 1],
};
Iif (!isNaN(rrTokens[1] as unknown as number)) result.ttl = parseInt(rrTokens[1], 10);
return result;
}
function parseSRV(rr: string) {
const rrTokens = rr.trim().split(/\s+/g);
const l = rrTokens.length;
const result: SRVType = {
name: rrTokens[0],
target: rrTokens[l - 1],
priority: parseInt(rrTokens[l - 4], 10),
weight: parseInt(rrTokens[l - 3], 10),
port: parseInt(rrTokens[l - 2], 10),
};
Iif (!isNaN(rrTokens[1] as unknown as number)) result.ttl = parseInt(rrTokens[1], 10);
return result;
}
function parseSPF(rr: string) {
const rrTokens = rr.trim().split(/\s+/g);
const result: SPFType = {
name: rrTokens[0],
data: '',
};
let l = rrTokens.length;
while (l-- > 4) {
result.data = rrTokens[l] + ' ' + result.data.trim();
}
Iif (!isNaN(rrTokens[1] as unknown as number)) result.ttl = parseInt(rrTokens[1], 10);
return result;
}
function parseURI(rr: string) {
const rrTokens = rr.trim().split(/\s+/g);
const l = rrTokens.length;
const result: URIType = {
name: rrTokens[0],
target: rrTokens[l - 1].replace(/"/g, ''),
priority: parseInt(rrTokens[l - 3], 10),
weight: parseInt(rrTokens[l - 2], 10),
};
Iif (!isNaN(rrTokens[1] as unknown as number)) result.ttl = parseInt(rrTokens[1], 10);
return result;
}
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