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mail: dnsbl can give empty records

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This commit is contained in:
Girish Ramakrishnan
2025-06-28 16:52:37 +02:00
parent a7aec70bc1
commit 0427d08ede
2 changed files with 5 additions and 6 deletions
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10
src/mail.js
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@@ -501,6 +501,7 @@ const RBL_LIST = [
}
];
// https://tools.ietf.org/html/rfc5782
async function checkRbl(type, mailDomain) {
assert.strictEqual(typeof type, 'string');
assert.strictEqual(typeof mailDomain, 'object');
@@ -516,22 +517,21 @@ async function checkRbl(type, mailDomain) {
const flippedIp = type === 'ipv4' ? ip.split('.').reverse().join('.') : reverseIPv6(ip);
// https://tools.ietf.org/html/rfc5782
const blockedServers = [];
for (const rblServer of RBL_LIST) {
if (type === 'ipv6' && rblServer[type] !== true) continue; // all support ipv4
const [error, records] = await safe(dig.resolve(`${flippedIp}.${rblServer.dns}`, 'A', DNS_OPTIONS));
if (error || !records) continue; // not listed
if (error || records.length === 0) continue; // not listed
debug(`checkRbl: ${domain} flippedIp: ${flippedIp} is in the blocklist of ${rblServer.dns}`);
debug(`checkRbl (${domain}) flippedIp: ${flippedIp} is in the blocklist of ${rblServer.dns}: ${JSON.stringify(records)}`);
const result = Object.assign({}, rblServer);
const [error2, txtRecords] = await safe(dig.resolve(`${flippedIp}.${rblServer.dns}`, 'TXT', DNS_OPTIONS));
result.txtRecords = error2 || !txtRecords ? 'No TXT record' : txtRecords.map(x => x.join(''));
debug(`checkRbl: ${domain} error: ${error2?.message || null} txtRecords: ${JSON.stringify(txtRecords)}`);
debug(`checkRbl (${domain}) error: ${error2?.message || null} txtRecords: ${JSON.stringify(txtRecords)}`);
blockedServers.push(result);
}
@@ -540,7 +540,7 @@ async function checkRbl(type, mailDomain) {
status: blockedServers.length === 0 ? 'passed' : 'failed',
ip,
servers: blockedServers,
message: `Check using "host ${flippedIp} 127.0.0.150"`
message: ''
};
}