266 lines
9.2 KiB
JavaScript
266 lines
9.2 KiB
JavaScript
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const express = require('express')
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const dns = require('dns');
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const swipl = require('swipl');
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const app = express()
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const PORT = 3000
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swipl.call('assert(ip("_", "_"))');
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swipl.call('assert(nip("_", "_"))');
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swipl.call('assert(all("_", "_"))');
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swipl.call('assert((allowed_to_send_email(Domain, IP) :- (ip(Domain, IP)), once(\\+ all(Domain, "-"); \\+ nip(Domain, IP))))');
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const spf = (req, res) => {
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try {
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const { domain } = req.query;
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console.log(domain)
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let spf = ""
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dns.resolveTxt(domain, (err, address) => {
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if (err) {
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console.error(err)
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return res.status(400).send("ERROR: occur on resolving SPF")
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}
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else {
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console.log(address)
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for (let i = 0; i < address.length; i++) {
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const text = address[i][0];
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console.log(text)
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if (text.indexOf("v=spf") !== -1) {
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spf = text;
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break;
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}
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}
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}
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if (!spf) {
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return res.status(400).send(`ERROR: No SPF record found in ${domain}`)
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}
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const spfArray = spf.split(" ");
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console.log(spfArray)
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return parseSPF(domain, spfArray, swipl, domain, (err) => {
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if (err) {
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console.error(err)
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return res.status(err.code).send(err.message)
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}
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const query = new swipl.Query(`allowed_to_send_email(${domain}, IP)`);
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let ret = null;
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let result = []
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while (ret = query.next()) {
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console.log(`Allowed IP value is: ${ret.IP}`);
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result.push(`${ret.IP}`);
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}
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query.close();
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return res.status(200).send(result)
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})
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})
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}
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catch (e) {
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console.log(e)
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}
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}
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const parseSPF = (domain, spf, swipl, curr, callback) => {
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console.log(domain, spf, curr)
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let err = undefined
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if (spf.length === 0) {
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return callback(err);
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}
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const str = spf[0]
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//ip46
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if (str.match("^[+~?]?ip[46]:(.+)$")) {
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console.log("matched ip[46]!")
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swipl.call(`assert(ip(${domain}, "${str.match("^[+~?]?ip[46]:(.+)")[1]}"))`);
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console.log(`assert(ip(${domain}, "${str.match("^[+~?]?ip[46]:(.+)")[1]}"))`);
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return parseSPF(domain, spf.slice(1), swipl, curr, callback);
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}
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else if (str.match("^-ip4:(.+)$")) {
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console.log("matched -ip[46]!")
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swipl.call(`assert(nip(${domain}, "${str.match("^-ip[46]:(.+)")[1]}"))`);
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console.log(`assert(nip(${domain}, "${str.match("^-ip[46]:(.+)")[1]}"))`);
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return parseSPF(domain, spf.slice(1), swipl, curr, callback);
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}
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//a
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else if (str.match("^[+~?]?a$")) {
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console.log("matched a!")
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return dns.lookup(domain, (err, address, family) => {
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if (err) {
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console.error(err)
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err = { code: 400, message: "ERROR: occur on resolving a" }
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return callback(err);
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}
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swipl.call(`assert(ip(${domain}, "${address}"))`);
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console.log(`assert(ip(${domain}, "${address}"))`);
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return parseSPF(domain, spf.slice(1), swipl, curr, callback);
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});
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}
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else if (str.match("^-a$")) {
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console.log("matched -a!")
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return dns.lookup(domain, (err, address, family) => {
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if (err) {
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console.error(err)
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err = { code: 400, message: "ERROR: occur on resolving a" }
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return callback(err);
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}
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swipl.call(`assert(nip(${domain}, "${address}"))`);
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console.log(`assert(nip(${domain}, "${address}"))`);
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return parseSPF(domain, spf.slice(1), swipl, curr, callback);
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});
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}
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//mx
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else if (str.match("^[+~?]?mx$")) {
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console.log("matched mx!")
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return dns.resolveMx(domain, (err, address) => {
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for (let i = 0; i < address.length; i++) {
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const mx = address[i].exchange;
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dns.lookup(mx, (err, address, family) => {
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if (err) {
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console.error(err)
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err = { code: 400, message: "ERROR: occur on resolving mx" }
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return callback(err);
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}
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swipl.call(`assert(ip(${domain}, "${address}"))`);
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return parseSPF(domain, spf.slice(1), swipl, curr, callback);
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});
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}
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})
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}
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else if (str.match("^-mx$")) {
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console.log("matched -mx!")
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return dns.resolveMx(domain, (err, address) => {
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for (let i = 0; i < address.length; i++) {
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const mx = address[i].exchange;
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dns.lookup(mx, (err, address, family) => {
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if (err) {
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console.error(err)
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err = { code: 400, message: "ERROR: occur on resolving mx" }
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return callback(err);
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}
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swipl.call(`assert(nip(${domain}, "${address}"))`);
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return parseSPF(domain, spf.slice(1), swipl, curr, callback);
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});
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}
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})
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}
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//include
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else if (str.match("^include:(.+)$")) {
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next = str.match("^include:(.+)$")[1]
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console.log("matched include:", next)
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let txt = ""
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dns.resolveTxt(next, (err, address) => {
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console.log("hello")
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if (err) {
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console.error(err)
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err = { code: 400, message: "ERROR: occur on resolving SPF" }
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return callback(err);
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}
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else {
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console.log(address)
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for (let i = 0; i < address.length; i++) {
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const text = address[i][0];
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console.log(text)
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if (text.indexOf("v=spf") !== -1) {
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txt = text;
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break;
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}
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}
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}
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if (!txt) {
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err = { code: 400, message: "ERROR: Fail to find SPF record" }
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return callback(err);
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}
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const spfArray = txt.split(" ");
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console.log(spfArray)
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return parseSPF(domain, spfArray, swipl, next, (err) => {
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if (err) {
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console.error(err)
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return res.status(err.code).send(err.message)
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}
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return parseSPF(domain, spf.slice(1), swipl, curr, callback);
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})
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})
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}
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//redirect
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else if (str.match("^redirect=(.+)$")) {
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next = str.match("^redirect=(.+)$")[1]
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console.log("matched redirect:", next)
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let txt = ""
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dns.resolveTxt(next, (err, address) => {
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if (err) {
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console.error(err)
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err = { code: 400, message: "ERROR: occur on resolving SPF" }
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return callback(err);
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}
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else {
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console.log(address)
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for (let i = 0; i < address.length; i++) {
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const text = address[i][0];
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console.log(text)
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if (text.indexOf("v=spf") !== -1) {
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txt = text;
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break;
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}
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}
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}
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if (!txt) {
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err = { code: 400, message: "ERROR: Fail to find SPF record" }
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return callback(err);
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}
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const spfArray = txt.split(" ");
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console.log(spfArray)
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return parseSPF(domain, spfArray, swipl, domain, (err) => {
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if (err) {
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console.error(err)
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return res.status(err.code).send(err.message)
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}
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else {
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return parseSPF(domain, spf.slice(1), swipl, curr, callback);
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}
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})
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})
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}
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//all
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else if (str.match("^-all$")) {
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console.log("matched -all!")
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swipl.call(`assert(all(${domain}, "-"))`);
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console.log(`assert(all(${domain}, "-"))`);
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return parseSPF(domain, spf.slice(1), swipl, curr, callback);
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}
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//others
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else {
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return parseSPF(domain, spf.slice(1), swipl, curr, callback);
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}
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}
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app.get('/spf', spf)
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app.listen(PORT, (err) => {
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if (err) {
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return console.error(err);
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}
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return console.log(`Server is listening on ${PORT}`);
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});
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//test
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// const spfArray = "v=spf1 include:_netblocks.google.com include:_netblocks2.google.com include:_netblocks3.google.com ~all".split(" ");
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// const domain = "gmail.com"
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// parseSPF(domain, spfArray, swipl, domain, (err) => {
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// if (err) {
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// return res.status(err.code).send(err.message)
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// }
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// const query = new swipl.Query(`allowed_to_send_email(${domain}, IP)`);
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// let ret = null;
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// let result = []
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// while (ret = query.next()) {
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// console.log(`Allowed IP value is: ${ret.IP}`);
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// result.push(`${ret.IP}`);
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// }
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// query.close();
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// // return res.status(200).send(result)
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// });
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