fix: Handle DNS TXT array result (#15)

* Add test for facebookmail.com
* Fix command-line tool, was using callback and not await
* Silence skipping unknown modifier: v error
* Switch to promise.then.catch for CLI util

---------

Co-authored-by: Steve Freegard <steve.freegard@abusix.com>

bin/spf

@@ -34,15 +34,14 @@ if (parsed.domain) {
   }
 }
 
-spf.check_host(parsed.ip, (domain ? domain : parsed.helo), null, function (err, result) {
-  if (err) {
-    console.log(`Error: ${err.message}`);
-    process.exit(1);
-  }
+spf.check_host(parsed.ip, (domain ? domain : parsed.helo)).then((result) => {
   console.log([
     `ip=${parsed.ip}`,
     `helo="${(parsed.helo ? parsed.helo : '')}"`,
     `domain="${(domain ? domain : '')}"`,
     `result=${spf.result(result)}`
   ].join(' '));
-})
+}).catch((err) => {
+  console.error(`Error: ${err.message}`);
+  process.exit(1);
+});

lib/spf.js

@@ -193,7 +193,11 @@ class SPF {
 
     let spf_record;
     let match;
-    for (const txt_rr of txt_rrs) {
+    for (let txt_rr of txt_rrs) {
+      // txt_rr might be an array, so handle that case
+      if (Array.isArray(txt_rr)) {
+        txt_rr = txt_rr.join('');
+      }
 
       match = /^(v=spf1(?:$|\s.+$))/i.exec(txt_rr);
       if (!match) {
@@ -653,6 +657,10 @@ class SPF {
     // NOT IMPLEMENTED
     return this.SPF_NONE
   }
+
+  async mod_v (str) {
+    return this.SPF_NONE
+  }
 }
 
 exports.SPF = SPF;

test/spf.js

@@ -78,6 +78,13 @@ describe('SPF', function () {
     }
   })
 
+  it('check_host, facebook.com, pass', async function () {
+    this.timeout = 3000;
+    this.SPF.count = 0;
+    const rc = await this.SPF.check_host('69.171.232.145', 'facebookmail.com');
+    assert.equal(rc, this.SPF.SPF_PASS, "pass");
+  })
+
   it('valid_ip, true', function (done) {
     assert.equal(this.SPF.valid_ip(':212.70.129.94'), true);
     done()