Faster mapping of CIDRs to IPs

Author: James Hebden

Interlace/lib/core/input.py

@@ -1,18 +1,15 @@
 import functools
 import itertools
 import os.path
+import socket
+import struct
 import sys
-from io import TextIOWrapper
 from argparse import ArgumentParser
+from io import TextIOWrapper
 from random import choice
 
-from netaddr import (
-    IPRange,
-    IPSet,
-    glob_to_iprange,
-)
-
 from Interlace.lib.threader import Task
+from netaddr import IPGlob, IPRange, IPSet, glob_to_iprange
 
 
 class InputHelper(object):
@@ -34,7 +31,7 @@ def check_positive(parser, arg):
             ivalue = int(arg)
             if ivalue <= 0:
                 raise parser.ArgumentTypeError("%s is not a valid positive integer!" % arg)
-        except ValueError as e:
+        except ValueError:
             raise parser.ArgumentValueError("%s is not a a number!" % arg)
 
         return arg
@@ -50,6 +47,42 @@ def _get_files_from_directory(arg):
 
         return files
 
+    @staticmethod
+    def _get_ips_from_range(ip_range):
+        ips = set()
+        ip_range = ip_range.split("-")
+
+        # parsing the above structure into an array and then making into an IP address with the end value
+        end_ip = ".".join(ip_range[0].split(".")[0:-1]) + "." + ip_range[1]
+
+        # creating an IPRange object to get all IPs in between
+        range_obj = IPRange(ip_range[0], end_ip)
+
+        for ip in range_obj:
+            ips.add(str(ip))
+
+        return ips
+
+    @staticmethod
+    def _get_ips_from_glob(glob_ips):
+        ip_glob = IPGlob(glob_ips)
+
+        ips = set()
+
+        for ip in ip_glob:
+            ips.add(str(ip))
+
+        return ips
+
+    @staticmethod
+    def _get_cidr_to_ips(cidr_range):
+        (ip, cidr) = cidr_range.split("/")
+        mask = 32 - int(cidr)
+        first_ip = struct.unpack(">I", socket.inet_aton(ip))[0]
+        last_ip = first_ip | ((1 << mask) - 1)
+        ips = frozenset([socket.inet_ntoa(struct.pack('>I', x)) for x in range(first_ip, last_ip)])
+        return ips
+
     @staticmethod
     def _process_port(port_type):
         if "," in port_type:
@@ -492,7 +525,7 @@ def setup_parser():
             '--repeat', dest='repeat',
             help='repeat the given command x number of times.'
         )
-        
+
         output_types = parser.add_mutually_exclusive_group()
         output_types.add_argument(
             '-v', '--verbose', dest='verbose', action='store_true', default=False,