Modify subdomain sorting

sublist3r.py

@@ -17,6 +17,7 @@ import multiprocessing
 import threading
 import dns.resolver
 import socket
+import functools
 from subbrute import subbrute
 from collections import Counter
 from Queue import Queue
@@ -78,6 +79,45 @@ def write_file(filename, subdomains):
         for subdomain in subdomains:
             f.write(subdomain+"\r\n")
 
+def subdomain_cmp(d1, d2):
+    """cmp function for subdomains d1 and d2.
+
+    This cmp function orders subdomains from the top-level domain at the right
+    reading left, then moving '^' and 'www' to the top of their group. For
+    example, the following list is sorted correctly:
+
+    [
+        'example.com',
+        'www.example.com',
+        'a.example.com',
+        'www.a.example.com',
+        'b.a.example.com',
+        'b.example.com',
+        'example.net',
+        'www.example.net',
+        'a.example.net',
+    ]
+
+    """
+    d1 = d1.split('.')[::-1]
+    d2 = d2.split('.')[::-1]
+
+    val = 1 if d1>d2 else (-1 if d1<d2 else 0)
+    if ((len(d1) < len(d2)) and
+        (d1[-1] == 'www') and
+        (d1[:-1] == d2[:len(d1)-1])):
+        val = -1
+    elif ((len(d1) > len(d2)) and
+          (d2[-1] == 'www') and
+          (d1[:len(d2)-1] == d2[:-1])):
+        val = 1
+    elif d1[:-1] == d2[:-1]:
+        if d1[-1] == 'www':
+            val = -1
+        elif d2[-1] == 'www':
+            val = 1
+    return val
+
 class enumratorBase(object):
     def __init__(self, base_url, engine_name, domain, subdomains=None):
         subdomains = subdomains or []
@@ -1033,7 +1073,10 @@ def main():
     subdomains = search_list.union(bruteforce_list)
 
     if subdomains:
-        subdomains = sorted(subdomains)
+        subdomains = sorted(
+            subdomains,
+            key=functools.cmp_to_key(subdomain_cmp),
+        )
         if savefile:
             write_file(savefile, subdomains)