CSE505/Project/index.js
2024-04-17 18:32:38 -04:00

266 lines
9.2 KiB
JavaScript

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