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153 lines
3.6 KiB
153 lines
3.6 KiB
#!/usr/bin/env node
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'use strict';
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// EXAMPLE:
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// node bin/dns-parse.js samples/a-0.mdns.bin
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var path = require('path');
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// pass a terminal arg
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var filename = process.argv[2];
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var outname = process.argv[3];
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if (!filename || /(-h)|(--help)/.test(process.argv.join(' '))) {
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console.error('');
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console.error(
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'Accepts a DNS packet (binary or json), converts it, and then converts it back to verify the function of the parser and packer'
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);
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console.error('');
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console.error(
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'Usage: node bin/dns-test.js <path/to/sample.json|.bin> <path/to/sample.bin|.json>'
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);
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console.error(
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'Example: node bin/dns-test.js ./samples/services-0.mdns.json ./samples/services-0.mdns.bin'
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);
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process.exit(1);
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return;
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}
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var PromiseA = require('bluebird');
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var fs = PromiseA.promisifyAll(require('fs'));
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var dnsjs = require('../').DNSPacket;
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var extname = path
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.extname(filename)
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.substr(1)
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.toLowerCase();
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if ('json' !== extname && 'bin' !== extname) {
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console.error(
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'The file extension must end in .json or .bin (raw DNS packet)'
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);
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process.exit(3);
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return;
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}
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var hexdump = require('@root/hexdump');
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function testJsonAsync(nb) {
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var packet = dnsjs.write(JSON.parse(nb.toString('ascii')));
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var str = hexdump(packet);
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console.info(str);
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var json = dnsjs.parse(packet);
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if (json.error) {
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console.error(json);
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process.exit(37);
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return;
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}
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console.info('[OK] JSON -> binary -> JSON');
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if (!outname) {
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console.warn('');
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console.warn(
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"Usage: node bin/dns-test.js '" +
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filename +
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"' './" +
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path
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.basename(filename)
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.replace(path.extname(filename), '.bin') +
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"'"
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);
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console.warn('');
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return;
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}
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fs.writeFileSync(outname, packet, null);
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}
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function testBinAsync(nb) {
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var bin = nb.buffer.slice(nb.byteOffset, nb.byteOffset + nb.byteLength);
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var json = dnsjs.parse(bin);
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if (json.error) {
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console.error(json);
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process.exit(38);
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return;
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}
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var bin2 = dnsjs.write(json);
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//var debugname = outname || path.basename(filename);
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//fs.writeFileSync(debugname.replace(path.extname(debugname), '.bin'), bin2, null);
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var json2 = dnsjs.parse(bin2);
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if (json2.error) {
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console.error(json2);
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process.exit(37);
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return;
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}
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var assert = require('assert');
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// EXPLANATION:
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// The strategy used for compression pointers has not yet been proven
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// as deterministic... and we don't implement them anyway, so this may not be the same
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json = JSON.parse(
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JSON.stringify(json)
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.replace(/,"labels":.*?\]/, '')
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.replace(/,"cpcount":\d+/, '')
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);
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json2 = JSON.parse(
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JSON.stringify(json2)
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.replace(/,"labels":.*?\]/, '')
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.replace(/,"cpcount":\d+/, '')
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);
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//json2 = JSON.parse(JSON.stringify(json2));
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try {
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assert.deepEqual(json, json2);
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} catch (e) {
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console.error('');
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console.error('Original');
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console.error(JSON.stringify(json, null, 2));
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console.error('');
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console.error('Converted');
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console.error(JSON.stringify(json2, null, 2));
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console.error('');
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process.exit(422);
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return;
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}
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console.info('[OK] binary -> JSON -> binary -> JSON');
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console.warn(
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'(compression pointer support needs to be improved in order to support direct bin -> JSON -> bin testing)'
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);
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if (!outname) {
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console.warn('');
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console.warn(
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"Usage: node bin/dns-test.js '" +
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filename +
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"' './" +
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path
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.basename(filename)
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.replace(path.extname(filename), '.json') +
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"'"
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);
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console.warn('');
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return;
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}
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fs.writeFileSync(outname, JSON.stringify(json, null, 2), null);
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}
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if ('json' === extname) {
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return fs.readFileAsync(filename, null).then(testJsonAsync);
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}
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if ('bin' === extname) {
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return fs.readFileAsync(filename, null).then(testBinAsync);
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}
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