policy: Import zeek-community-id scripts into protocols/conn frameworks/notice

Slightly adapted for indentation.

scripts/policy/protocols/conn/community-id-logging.zeek

@@ -0,0 +1,26 @@
+##! Adds community hash IDs to conn.log.
+@load base/protocols/conn
+
+module CommunityID;
+
+export {
+	# An unsigned 16-bit number to seed our hashing
+	option seed: count = 0;
+
+	# Whether to add a base64 pass over the hash digest.
+	# Enabled by default, since it shortens the output.
+	option do_base64: bool = T;
+
+	# Add the ID string field to the connection log record.
+	redef record Conn::Info += {
+		community_id: string &optional &log;
+	};
+}
+
+module Conn;
+
+event new_connection(c: connection)
+	{
+	Conn::set_conn(c, F);  # likely first to access :-/
+	c$conn$community_id = community_id_v1(c$id, CommunityID::seed, CommunityID::do_base64);
+	}