bundles/postfix: use threading in check_spam_blocklist

bundles/postfix/files/check_spam_blocklist

@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 
+from concurrent.futures import ThreadPoolExecutor, as_completed
 from ipaddress import ip_address, IPv6Address
 from sys import argv, exit
 
@@ -9,7 +10,7 @@ from dns.resolver import Resolver, NoAnswer, NXDOMAIN, NoNameservers
 
 BLOCKLISTS = [
     '0spam.fusionzero.com',
-    'bl.mailspike.Dorg',
+    'bl.mailspike.org',
     'bl.spamcop.net',
     'blackholes.brainerd.net',
     'dnsbl-1.uceprotect.net',
@@ -28,53 +29,68 @@ BLOCKLISTS = [
     'ubl.unsubscore.com',
     'unconfirmed.dsbl.org',
     'virbl.dnsbl.bit.nl',
-    'virbl.dnsbl.bit.nl',
     'zen.spamhaus.org',
 ]
 
+def check_list(ip_list, blocklist):
+    resolver = Resolver()
+    resolver.timeout = 5
+    resolver.lifetime = 5
+
+    dns_name = '{}.{}'.format(
+        '.'.join(ip_list),
+        blocklist,
+    )
+
+    returncode = 0
+    msgs = []
+
+    try:
+        result = resolver.query(dns_name)
+        for item in result:
+            msgs.append('{} listed in {} as {}'.format(
+                ip,
+                blocklist,
+                item,
+            ))
+            returncode = 2
+    except (NoAnswer, NXDOMAIN, NoNameservers, Timeout):
+        # Probably fine
+        pass
+    except Exception as e:
+        return [repr(e)], 3
+
+    return msgs, returncode
+
 try:
     ip = ip_address(argv[1])
 except Exception:
     print('usage: {} <ip>'.format(argv[0]))
     exit(3)
 
-found = False
-
-resolver = Resolver()
-resolver.timeout = 5
-resolver.lifetime = 5
-
 if isinstance(ip, IPv6Address):
     ip_list = list(ip.exploded.replace(':', ''))
 else:
     ip_list = ip.exploded.split('.')
 
 ip_list.reverse()
+exitcode = 0
+
+with ThreadPoolExecutor(max_workers=len(BLOCKLISTS)) as executor:
+    futures = set()
 
     for blocklist in BLOCKLISTS:
-    dns_name = '{}.{}'.format(
-        '.'.join(ip_list),
-        blocklist,
-    )
+        futures.add(executor.submit(check_list, ip_list, blocklist))
 
-    try:
-        result = resolver.query(dns_name)
-        for item in result:
-            print('{} listed in {} as {}'.format(
-                ip,
-                blocklist,
-                item,
-            ))
-            found = True
-    except (NoAnswer, NXDOMAIN, NoNameservers, Timeout):
-        # Probably fine
-        pass
-    except Exception as e:
-        print(repr(e))
-        exit(3)
+    for future in as_completed(futures):
+        msgs, this_exitcode = future.result()
 
-if found:
-    exit(2)
-else:
+        for msg in msgs:
+            print(msg)
+
+        exitcode = max(exitcode, this_exitcode)
+
+if exitcode == 0:
     print('OK')
-    exit(0)
+
+exit(exitcode)

bundles/postfix/metadata.py

@@ -105,7 +105,7 @@ def icinga2(metadata):
             if not ip.is_private:
                 services[f'SPAM BLOCKLIST {ip}'] = {
                     'command_on_monitored_host': f'/usr/local/share/icinga/plugins/check_spam_blocklist {ip}',
-                    'vars.sshmon_timeout': 60,
+                    'vars.sshmon_timeout': 15,
                     'check_interval': '15m',
                     'retry_interval': '5m',
                 }