async-ify, handle vanity ns, bugfix some ns logic
This commit is contained in:
AJ ONeal
parent
717fb1fe3e
commit
691f5a4a15
215
lib/dns-store.js
215
lib/dns-store.js
@ -9,9 +9,8 @@ module.exports.ask = function (query, cb) {
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var NOERROR = 0;
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var NXDOMAIN = 3;
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var REFUSED = 5;
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var primaryNameservers = [ 'localhost' ];
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function getRecords(db, qname) {
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function getRecords(db, qname, cb) {
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var myRecords = db.records.filter(function (r) {
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if ('string' !== typeof r.domain) {
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return false;
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@ -24,7 +23,9 @@ function getRecords(db, qname) {
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}
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});
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return myRecords;
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process.nextTick(function () {
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cb(null, myRecords);
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});
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}
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function dbToResourceRecord(r) {
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@ -70,52 +71,62 @@ function getNs(db, ds, results, cb) {
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var d = ds.shift();
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if (!d) {
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results.rcode = NXDOMAIN;
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results.header.rcode = NXDOMAIN;
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cb(null, results);
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return;
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}
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var qn = d.id.toLowerCase();
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getRecords(db, qn).forEach(function (r) {
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if ('NS' !== r.type) {
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return;
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return getRecords(db, qn, function (err, records) {
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if (err) { cb(err); return; }
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records.forEach(function (r) {
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if ('NS' !== r.type) {
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return;
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}
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var ns = {
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name: r.domain
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, typeName: r.type // NS
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, className: 'IN'
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, ttl: r.ttl || 300
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, data: r.address || r.value || r.data
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};
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console.log('got NS record:');
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console.log(r);
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console.log(ns);
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// TODO what if this NS is one of the NS?
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// return SOA record instead
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results.authority.push(ns);
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});
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if (!results.authority.length) {
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return getNs(db, ds, results, cb);
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}
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var ns = {
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name: r.domain
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, typeName: r.type // NS
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, className: 'IN'
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, ttl: r.ttl || 300
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, data: r.address || r.value || r.data
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};
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console.log('got NS record:');
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console.log(r);
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console.log(ns);
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// TODO what if this NS is one of the NS?
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// return SOA record instead
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results.authority.push(ns);
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});
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if (results.authority.length) {
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// d.vanityNs should only be vanity nameservers (pointing to this same server)
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if (d.vanityNs || results.authority.some(function (ns) {
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console.log('[debug] ns', ns);
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return -1 !== db.primaryNameservers.indexOf(ns.data.toLowerCase());
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})) {
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results.authority.length = 0;
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results.authority.push(domainToSoa(db, d));
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results.header.rcode = NXDOMAIN;
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}
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cb(null, results);
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return;
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}
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results.header.rcode = NXDOMAIN;
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cb(null, results);
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});
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}
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function getSoa(db, domain, results, cb) {
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console.log('[DEV] getSoa entered');
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var nameservers = domain.nameservers || primaryNameservers;
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function domainToSoa(db, domain) {
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var nameservers = domain.vanityNs || db.primaryNameservers;
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var index = Math.floor(Math.random() * nameservers.length) % nameservers.length;
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var nameserver = nameservers[index];
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results.authority.push({
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return {
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name: domain.id
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, typeName: 'SOA'
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, className: 'IN'
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@ -148,7 +159,13 @@ function getSoa(db, domain, results, cb) {
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// minimum -- how long to cache a non-existent domain (also the default ttl for BIND)
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, minimum: domain.minimum || 5
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, nx: domain.minimum || 5
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});
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};
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}
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function getSoa(db, domain, results, cb) {
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console.log('[DEV] getSoa entered');
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results.authority.push(domainToSoa(db, domain));
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cb(null, results);
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return;
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@ -205,84 +222,82 @@ module.exports.query = function (input, query, cb) {
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, question: [ query.question[0] ], answer: [], authority: [], additional: []
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};
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var myRecords = getRecords(db, qname);
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return getRecords(db, qname, function (err, myRecords) {
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if (err) { cb(err); return; }
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if (myRecords.length) {
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myRecords.forEach(function (r) {
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results.answer.push(dbToResourceRecord(r));
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});
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results.header.rcode = NOERROR;
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console.log('[DEV] results', results);
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cb(null, results);
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return;
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}
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if (!myRecords.length) {
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// If the query is www.foo.delegated.example.com
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// and we have been delegated delegated.example.com
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// and delegated.example.com exists
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// but foo.delegated.example.com does not exist
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// what's the best strategy for returning the record?
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//
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// What does PowerDNS do in these situations?
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// https://doc.powerdns.com/md/authoritative/backend-generic-mysql/
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// How to optimize:
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// Assume that if a record is being requested, it probably exists
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// (someone has probably published it somewhere)
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// If the record doesn't exist, then see if any of the domains are managed
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// [ 'www.john.smithfam.net', 'john.smithfam.net', 'smithfam.net', 'net' ]
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// Then if one of those exists, return the SOA record with NXDOMAIN
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var qarr = qname.split('.');
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var qnames = [];
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while (qarr.length) {
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qnames.push(qarr.join('.').toLowerCase());
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qarr.shift(); // first
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}
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var myDomains = db.domains.filter(function (d) {
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return -1 !== qnames.indexOf(d.id.toLowerCase());
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});
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// this should result in a REFUSED status
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if (!myDomains.length) {
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// REFUSED will have no records, so we could still recursion, if enabled
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results.header.rcode = REFUSED;
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if (myRecords.length) {
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myRecords.forEach(function (r) {
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results.answer.push(dbToResourceRecord(r));
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});
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results.header.rcode = NOERROR;
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console.log('[DEV] results', results);
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cb(null, results);
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return;
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}
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myDomains.sort(function (d1, d2) {
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if (d1.id.length > d2.id.length) {
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return -1;
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if (!myRecords.length) {
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// If the query is www.foo.delegated.example.com
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// and we have been delegated delegated.example.com
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// and delegated.example.com exists
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// but foo.delegated.example.com does not exist
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// what's the best strategy for returning the record?
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//
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// What does PowerDNS do in these situations?
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// https://doc.powerdns.com/md/authoritative/backend-generic-mysql/
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// How to optimize:
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// Assume that if a record is being requested, it probably exists
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// (someone has probably published it somewhere)
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// If the record doesn't exist, then see if any of the domains are managed
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// [ 'www.john.smithfam.net', 'john.smithfam.net', 'smithfam.net', 'net' ]
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// Then if one of those exists, return the SOA record with NXDOMAIN
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var qarr = qname.split('.');
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var qnames = [];
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while (qarr.length) {
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qnames.push(qarr.join('.').toLowerCase());
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qarr.shift(); // first
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}
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if (d1.id.length < d2.id.length) {
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return 1;
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var myDomains = db.domains.filter(function (d) {
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return -1 !== qnames.indexOf(d.id.toLowerCase());
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});
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// this should result in a REFUSED status
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if (!myDomains.length) {
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// REFUSED will have no records, so we could still recursion, if enabled
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results.header.rcode = REFUSED;
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cb(null, results);
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return;
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}
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return 0;
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});
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console.log('sorted domains', myDomains);
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return getNs(db, myDomains.slice(0), results, function (err, results) {
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console.log('[DEV] getNs complete');
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myDomains.sort(function (d1, d2) {
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if (d1.id.length > d2.id.length) {
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return -1;
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}
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if (d1.id.length < d2.id.length) {
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return 1;
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}
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return 0;
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});
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console.log('sorted domains', myDomains);
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if (err) { cb(err, results); return; }
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return getNs(db, myDomains.slice(0), results, function (err, results) {
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console.log('[DEV] getNs complete');
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// has NS records
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if (NXDOMAIN !== results.header.rcode) { console.log(results); cb(null, results); return; }
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if (err) { cb(err, results); return; }
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// myDomains was sorted such that the longest was first
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getSoa(db, myDomains[0], results, cb);
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// has NS records (or SOA record if NS records match the server itself)
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if (results.authority.length) {
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console.log(results); cb(null, results); return;
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}
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});
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}
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// myDomains was sorted such that the longest was first
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getSoa(db, myDomains[0], results, cb);
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/*
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query.question.forEach(function (q) {
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module.exports.ask(q);
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});
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}
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});
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*/
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};
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}());
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@ -1,10 +1,11 @@
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'use strict';
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module.exports = {
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"domains": [
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"primaryNameservers": [ 'localhost' ] // 'ns1.redirect-www.org'
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, "domains": [
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{ "id": "daplie.me", "revokedAt": 0 }
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, { "id": "oneal.daplie.me", "revokedAt": 0 }
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, { "id": "aj.oneal.daplie.me", "revokedAt": 0 }
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, { "id": "aj.oneal.daplie.me", "revokedAt": 0, "vanityNs": [ 'ns1.daplie.me', 'ns2.daplie.me' ] }
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]
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, "records": [
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// zone daplie.me should be able to have some records on its own
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