[WIP] began dns server
This commit is contained in:
AJ ONeal
parent
51daf2378d
commit
01e753996a
388
bin/digd.js
388
bin/digd.js
|
|
@ -1,267 +1,42 @@
|
|||
#!/usr/bin/env node
|
||||
'use strict';
|
||||
|
||||
var dnsjs = require('dns-suite');
|
||||
var cli = require('cli');
|
||||
var dgram = require('dgram');
|
||||
var dnsjs = require('dns-suite');
|
||||
var hexdump = require('../hexdump');
|
||||
var crypto = require('crypto');
|
||||
var common = require('../common');
|
||||
|
||||
cli.parse({
|
||||
// 'b': [ false, 'set source IP address (defaults to 0.0.0.0)', 'string' ]
|
||||
'debug': [ false, 'more verbose output', 'boolean', false ]
|
||||
'class': [ 'c', 'class (defaults to IN)', 'string', 'IN' ]
|
||||
, 'debug': [ false, 'more verbose output', 'boolean', false ]
|
||||
//, 'insecure': [ false, 'turn off RaNDOm cAPS required for securing queries']
|
||||
//, 'ipv4': [ '4', 'use ipv4 exclusively (defaults to false)', 'boolean', false ]
|
||||
//, 'ipv6': [ '6', 'use ipv6 exclusively (defaults to false)', 'boolean', false ]
|
||||
//, 'json': [ false, 'output results as json', 'string' ]
|
||||
//, 'lint': [ false, 'attack (in the metaphorical sense) a nameserver with all sorts of queries to test for correct responses', 'string', false ]
|
||||
, 'mdns': [ false, "Alias for setting defaults to -p 5353 @224.0.0.251 -t PTR -q _services._dns-sd._udp.local and waiting for multiple responses", 'boolean', false ]
|
||||
, 'timeout': [ false, "How long, in milliseconds, to wait for a response. Alias of +time=", 'int', false ]
|
||||
, 'output': [ 'o', 'output prefix to use for writing query and response(s) to disk', 'file' ]
|
||||
, 'address': [ false, 'ip address(es) to listen on (defaults to 0.0.0.0,::0)', 'string' ]
|
||||
, 'port': [ 'p', 'port (defaults to 53 for dns and 5353 for mdns)', 'int' ]
|
||||
//, 'serve': [ 's', 'path to json file with array of responses to issue for given queries', 'string' ]
|
||||
, 'type': [ 't', 'type (defaults to ANY for dns and PTR for mdns)', 'string' ]
|
||||
, 'query': [ 'q', 'a superfluous explicit option to set the query as a command line flag' ]
|
||||
});
|
||||
|
||||
var fs = require('fs');
|
||||
var dgram = require('dgram');
|
||||
var commonTypes = [ 'A', 'AAAA', 'CNAME', 'MX', 'NS', 'PTR', 'SOA', 'SRV', 'TXT' ];
|
||||
var commonPrinters = {
|
||||
'ANY': function (q) {
|
||||
console.log(';' + q.name + '.', q.ttl, q.className, q.typeName, q.data || q.rdata || 'unknown record type');
|
||||
}
|
||||
|
||||
, 'A': function (q) {
|
||||
console.log(';' + q.name + '.', q.ttl, q.className, q.typeName, q.address);
|
||||
}
|
||||
, 'AAAA': function (q) {
|
||||
console.log(';' + q.name + '.', q.ttl, q.className, q.typeName, q.address);
|
||||
}
|
||||
, 'CNAME': function (q) {
|
||||
console.log(';' + q.name + '.', q.ttl, q.className, q.typeName, q.data + '.');
|
||||
}
|
||||
, 'MX': function (q) {
|
||||
console.log(';' + q.name + '.', q.ttl, q.className, q.typeName, q.priority + ' ' + q.exchange + '.');
|
||||
}
|
||||
, 'NS': function (q) {
|
||||
console.log(';' + q.name + '.', q.ttl, q.className, q.typeName, q.data);
|
||||
}
|
||||
, 'PTR': function (q) {
|
||||
console.log(';' + q.name + '.', q.ttl, q.className, q.typeName, q.data);
|
||||
}
|
||||
/*
|
||||
, 'SOA': function (q) {
|
||||
console.log(';' + q.name + '.', q.ttl, q.className, q.typeName, q.data);
|
||||
}
|
||||
*/
|
||||
, 'SRV': function (q) {
|
||||
console.log(';' + q.name + '.', q.ttl, q.className, q.typeName, q.priority + ' ' + q.weight + ' ' + q.port + ' ' + q.target);
|
||||
}
|
||||
, 'TXT': function (q) {
|
||||
console.log(';' + q.name + '.', q.ttl, q.className, q.typeName, '"' + q.data.join('" "') + '"');
|
||||
}
|
||||
};
|
||||
|
||||
function writeQuery(opts, query, queryAb) {
|
||||
var path = require('path');
|
||||
var binname = query.question[0].name + '.' + query.question[0].typeName.toLowerCase() + '.query.bin';
|
||||
var jsonname = query.question[0].name + '.' + query.question[0].typeName.toLowerCase() + '.query.json';
|
||||
var binpath = opts.output + '.' + binname;
|
||||
var jsonpath = opts.output + '.' + jsonname;
|
||||
var json = JSON.stringify(query, null, 2);
|
||||
if (-1 !== ['.', '/', '\\' ].indexOf(opts.output[opts.output.length -1])) {
|
||||
binpath = path.join(opts.output, binname);
|
||||
jsonpath = path.join(opts.output, jsonname);
|
||||
}
|
||||
|
||||
fs.writeFile(binpath, Buffer.from(queryAb), null, function () {
|
||||
console.log('wrote ' + queryAb.byteLength + ' bytes to ' + binpath);
|
||||
});
|
||||
fs.writeFile(jsonpath, json, null, function () {
|
||||
console.log('wrote ' + json.length + ' bytes to ' + jsonpath);
|
||||
});
|
||||
}
|
||||
|
||||
var count = 0;
|
||||
function writeResponse(opts, query, nb, packet) {
|
||||
var path = require('path');
|
||||
var binname = query.question[0].name + '.' + query.question[0].typeName.toLowerCase() + '.' + count + '.bin';
|
||||
var jsonname = query.question[0].name + '.' + query.question[0].typeName.toLowerCase() + '.' + count + '.json';
|
||||
var binpath = opts.output + '.' + binname;
|
||||
var jsonpath = opts.output + '.' + jsonname;
|
||||
var json = JSON.stringify(packet, null, 2);
|
||||
if (-1 !== ['.', '/', '\\' ].indexOf(opts.output[opts.output.length -1])) {
|
||||
binpath = path.join(opts.output, binname);
|
||||
jsonpath = path.join(opts.output, jsonname);
|
||||
}
|
||||
|
||||
count += 1;
|
||||
|
||||
fs.writeFile(binpath, nb, null, function () {
|
||||
console.log('wrote ' + nb.byteLength + ' bytes to ' + binpath);
|
||||
});
|
||||
fs.writeFile(jsonpath, json, null, function () {
|
||||
console.log('wrote ' + json.length + ' bytes to ' + jsonpath);
|
||||
});
|
||||
}
|
||||
|
||||
function request(query, opts) {
|
||||
var queryAb = dnsjs.DNSPacket.write(query);
|
||||
|
||||
if (opts.debug) {
|
||||
console.log('');
|
||||
console.log('DNS Question:');
|
||||
console.log('');
|
||||
console.log(query);
|
||||
console.log('');
|
||||
console.log(hexdump(queryAb));
|
||||
console.log('');
|
||||
console.log(dnsjs.DNSPacket.parse(queryAb));
|
||||
console.log('');
|
||||
}
|
||||
|
||||
var handlers = {};
|
||||
var server = dgram.createSocket({
|
||||
type: 'udp4'
|
||||
, reuseAddr: true
|
||||
});
|
||||
|
||||
handlers.onError = function (err) {
|
||||
console.error("error:", err.stack);
|
||||
server.close();
|
||||
};
|
||||
handlers.onMessage = function (nb) {
|
||||
console.log("YOYOYO GOT MESSAGE");
|
||||
var packet = dnsjs.DNSPacket.parse(nb.buffer.slice(nb.byteOffset, nb.byteOffset + nb.byteLength));
|
||||
|
||||
if (opts.debug) {
|
||||
console.log('');
|
||||
console.log('DNS Request:');
|
||||
console.log(packet);
|
||||
}
|
||||
|
||||
console.log('');
|
||||
console.log('; <<>> dig.js ' + 'v0.0.0' + ' <<>> ' + query.question[0].name);
|
||||
console.log(';; Got answer:');
|
||||
console.log(';; ->>HEADER<<-');
|
||||
console.log(JSON.stringify(packet.header));
|
||||
console.log('');
|
||||
console.log(';; QUESTION SECTION:');
|
||||
packet.question.forEach(function (q) {
|
||||
console.log(';' + q.name + '.', ' ', q.className, q.typeName);
|
||||
});
|
||||
/*
|
||||
function print(q) {
|
||||
var printer = commonPrinters[q.typeName] || commonPrinters.ANY;
|
||||
printer(q);
|
||||
}
|
||||
if (packet.answer.length) {
|
||||
console.log('');
|
||||
console.log(';; ANSWER SECTION:');
|
||||
packet.answer.forEach(print);
|
||||
}
|
||||
if (packet.authority.length) {
|
||||
console.log('');
|
||||
console.log(';; AUTHORITY SECTION:');
|
||||
packet.authority.forEach(print);
|
||||
}
|
||||
if (packet.additional.length) {
|
||||
console.log('');
|
||||
console.log(';; ADDITIONAL SECTION:');
|
||||
packet.additional.forEach(print);
|
||||
}
|
||||
console.log('');
|
||||
console.log(';; MSG SIZE rcvd: ' + nb.byteLength);
|
||||
console.log('');
|
||||
*/
|
||||
|
||||
if (opts.output) {
|
||||
console.log('');
|
||||
writeQuery(opts, query, queryAb);
|
||||
//writeResponse(opts, query, nb, packet);
|
||||
}
|
||||
};
|
||||
handlers.onListening = function () {
|
||||
console.log("YOYOYO ON LISTENING");
|
||||
/*jshint validthis:true*/
|
||||
var server = this;
|
||||
var nameserver = opts.nameserver;
|
||||
var nameservers;
|
||||
var index;
|
||||
|
||||
if (!nameserver) {
|
||||
nameservers = require('dns').getServers();
|
||||
index = crypto.randomBytes(2).readUInt16BE(0) % nameservers.length;
|
||||
nameserver = nameservers[index];
|
||||
if (opts.debug) {
|
||||
console.log(index, nameservers);
|
||||
}
|
||||
}
|
||||
|
||||
if (opts.mdns || '224.0.0.251' === opts.nameserver) {
|
||||
server.setBroadcast(true);
|
||||
server.addMembership(opts.nameserver);
|
||||
}
|
||||
|
||||
if (opts.debug) {
|
||||
console.log('');
|
||||
console.log('Bound and Listening:');
|
||||
console.log(server.address());
|
||||
}
|
||||
|
||||
if (opts.debug) {
|
||||
console.log('querying ' + nameserver + ':' + opts.port);
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
server.on('error', handlers.onError);
|
||||
server.on('message', handlers.onMessage);
|
||||
server.on('listening', handlers.onListening);
|
||||
|
||||
// 53 dns server
|
||||
// 5353 mdns
|
||||
console.log("YOYOYO BINDING ON", opts.port);
|
||||
server.bind(opts.port);
|
||||
}
|
||||
|
||||
cli.main(function (args, cli) {
|
||||
args.forEach(function (arg) {
|
||||
if (-1 !== commonTypes.indexOf(arg.toUpperCase())) {
|
||||
if (cli.type) {
|
||||
console.error("'type' was specified more than once");
|
||||
if (arg === '+norecurse') {
|
||||
if (cli.norecurse) {
|
||||
console.error("'+norecurse' was specified more than once");
|
||||
process.exit(1);
|
||||
return;
|
||||
}
|
||||
cli.type = cli.t = arg.toUpperCase();
|
||||
cli.norecurse = true;
|
||||
return;
|
||||
}
|
||||
|
||||
if (/^\+time=/.test(arg)) {
|
||||
if (cli.timeout) {
|
||||
console.error("'+time=' was specified more than once");
|
||||
process.exit(1);
|
||||
return;
|
||||
}
|
||||
cli.timeout = Math.round(parseInt(arg.replace(/\+time=/, ''), 10) * 1000);
|
||||
return;
|
||||
}
|
||||
|
||||
if (/^@/.test(arg)) {
|
||||
if (cli.nameserver) {
|
||||
console.error("'@server' was specified more than once");
|
||||
process.exit(1);
|
||||
return;
|
||||
}
|
||||
cli.nameserver = cli.n = arg.substr(1);
|
||||
return;
|
||||
}
|
||||
|
||||
if (cli.query) {
|
||||
console.error("'query' was specified more than once");
|
||||
process.exit(1);
|
||||
return;
|
||||
}
|
||||
cli.query = cli.q = arg;
|
||||
|
||||
});
|
||||
|
||||
if (cli.mdns) {
|
||||
|
|
@ -277,55 +52,116 @@ cli.main(function (args, cli) {
|
|||
if (!cli.query) {
|
||||
cli.query = '_services._dns-sd._udp.local';
|
||||
}
|
||||
if (!cli.timeout) {
|
||||
if (!('timeout' in cli)) {
|
||||
cli.timeout = 3000;
|
||||
}
|
||||
}
|
||||
|
||||
if (!cli.type) {
|
||||
cli.type = cli.t = 'A';
|
||||
}
|
||||
} else {
|
||||
if (!cli.port) {
|
||||
cli.port = cli.p = 53;
|
||||
}
|
||||
if (!cli.class) {
|
||||
cli.class = cli.c = 'IN';
|
||||
}
|
||||
if (!cli.query) {
|
||||
cli.query = 'example.com';
|
||||
/*
|
||||
console.error('');
|
||||
console.error('Usage:');
|
||||
console.error('digd.js [@server] [TYPE] [domain]');
|
||||
console.error('');
|
||||
console.error('Example:');
|
||||
console.error('digd.js daplie.com');
|
||||
console.error('');
|
||||
process.exit(1);
|
||||
*/
|
||||
}
|
||||
|
||||
var query = {
|
||||
header: {
|
||||
id: crypto.randomBytes(2).readUInt16BE(0)
|
||||
, qr: 0
|
||||
, opcode: 0
|
||||
, aa: 0 // NA
|
||||
, tc: 0 // NA
|
||||
, rd: 1
|
||||
, ra: 0 // NA
|
||||
, rcode: 0 // NA
|
||||
var handlers = {};
|
||||
var server = dgram.createSocket({
|
||||
type: cli.udp6 ? 'udp6' : 'udp4'
|
||||
//, reuseAddr: true
|
||||
});
|
||||
server.bind({
|
||||
port: cli.port
|
||||
, address: cli.address
|
||||
});
|
||||
|
||||
handlers.onError = function (err) {
|
||||
console.error("error:", err.stack);
|
||||
server.close();
|
||||
};
|
||||
handlers.onMessage = function (nb) {
|
||||
var queryAb = nb.buffer.slice(nb.byteOffset, nb.byteOffset + nb.byteLength);
|
||||
var query = dnsjs.DNSPacket.parse(queryAb);
|
||||
|
||||
if (cli.debug) {
|
||||
console.log('');
|
||||
console.log('DNS Question:');
|
||||
console.log('');
|
||||
console.log(query);
|
||||
console.log('');
|
||||
console.log(hexdump(queryAb));
|
||||
console.log('');
|
||||
}
|
||||
, question: [
|
||||
{ name: cli.query
|
||||
, typeName: cli.type
|
||||
, className: cli.class
|
||||
|
||||
console.log(';; Got question:');
|
||||
console.log(';; ->>HEADER<<-');
|
||||
console.log(JSON.stringify(query.header));
|
||||
console.log('');
|
||||
console.log(';; QUESTION SECTION:');
|
||||
query.question.forEach(function (q) {
|
||||
console.log(';' + q.name + '.', ' ', q.className, q.typeName);
|
||||
});
|
||||
|
||||
function print(q) {
|
||||
var printer = common.printers[q.typeName] || common.printers.ANY;
|
||||
printer(q);
|
||||
}
|
||||
]
|
||||
if (query.answer.length) {
|
||||
console.error('[ERROR] Query contains an answer section:');
|
||||
console.log(';; ANSWER SECTION:');
|
||||
query.answer.forEach(print);
|
||||
}
|
||||
if (query.authority.length) {
|
||||
console.log('');
|
||||
console.error('[ERROR] Query contains an authority section:');
|
||||
console.log(';; AUTHORITY SECTION:');
|
||||
query.authority.forEach(print);
|
||||
}
|
||||
if (query.additional.length) {
|
||||
console.log('');
|
||||
console.error('[ERROR] Query contains an additional section:');
|
||||
console.log(';; ADDITIONAL SECTION:');
|
||||
query.additional.forEach(print);
|
||||
}
|
||||
console.log('');
|
||||
console.log(';; MSG SIZE rcvd: ' + nb.byteLength);
|
||||
console.log('');
|
||||
|
||||
if (cli.output) {
|
||||
console.log('');
|
||||
common.writeQuery(cli, query, queryAb);
|
||||
//common.writeResponse(opts, query, nb, packet);
|
||||
}
|
||||
};
|
||||
handlers.onListening = function () {
|
||||
/*jshint validthis:true*/
|
||||
var server = this;
|
||||
var nameserver = cli.nameserver;
|
||||
var nameservers;
|
||||
var index;
|
||||
|
||||
if (!nameserver) {
|
||||
nameservers = require('dns').getServers();
|
||||
index = crypto.randomBytes(2).readUInt16BE(0) % nameservers.length;
|
||||
nameserver = nameservers[index];
|
||||
if (cli.debug) {
|
||||
console.log(index, nameservers);
|
||||
}
|
||||
}
|
||||
|
||||
if (cli.mdns || '224.0.0.251' === cli.nameserver) {
|
||||
server.setBroadcast(true);
|
||||
server.addMembership(cli.nameserver);
|
||||
}
|
||||
|
||||
console.log('');
|
||||
console.log('Bound and Listening:');
|
||||
console.log(server.address().address + '#' + server.address().port);
|
||||
};
|
||||
|
||||
if (!cli.daemon) {
|
||||
request(query, cli);
|
||||
return;
|
||||
console.log('');
|
||||
if (!cli.nocmd) {
|
||||
console.log('; <<>> dig.js ' + 'v0.0.0' + ' <<>> ' + process.argv.slice(2));
|
||||
console.log(';; global options: +cmd');
|
||||
}
|
||||
|
||||
server.on('error', handlers.onError);
|
||||
server.on('message', handlers.onMessage);
|
||||
server.on('listening', handlers.onListening);
|
||||
});
|
||||
|
|
|
|||
Loading…
Reference in New Issue