add dnsbl.py

1 files changed, 50 insertions, 0 deletions

diff --git a/modules/dnsbl.py b/modules/dnsbl.py
new file mode 100644
index 00000000..d2e3135d
--- /dev/null
+++ b/modules/dnsbl.py
@@ -0,0 +1,50 @@
+import ipaddress
+from src import ModuleManager, utils
+import dns.resolver
+
+DEFAULT_LISTS = [
+    "rbl.efnetrbl.org",
+    "zen.spamhaus.org"
+]
+
+class Module(ModuleManager.BaseModule):
+    @utils.hook("received.command.dnsbl")
+    def dnsbl(self, event):
+        args = event["args_split"]
+
+        lists = []
+        for i, arg in reversed(list(enumerate(args))):
+            if arg[0] == "@":
+                lists.insert(args.pop(i))
+        lists = lists or DEFAULT_LISTS
+
+        address = args[0]
+        failed = self._check_lists(lists, address)
+        if failed:
+            event["stderr"].write("%s failed for lists: %s" %
+                (address, ", ".join(failed)))
+        else:
+            event["stdout"].write("%s not found in blacklists" % address)
+
+    def _check_lists(self, lists, address):
+        address_obj = ipaddress.ip_address(address)
+
+        if address_obj.version == 6:
+            address = reversed(address_obj.exploded.replace(":", ""))
+        else:
+            address = reversed(address.split("."))
+        address = ".".join(address)
+
+        failed = []
+        for list in lists:
+            if not self._check_list(list, address):
+                failed.append(list)
+        return failed
+
+    def _check_list(self, list, address):
+        list_address = "%s.%s" % (address, list)
+        try:
+            dns.resolver.query(list_address)
+        except dns.resolver.NXDOMAIN:
+            return False
+        return True