From 3bce03ad8dad4ce85dfad1095cb8a14a55eee451 Mon Sep 17 00:00:00 2001
From: bmenrigh <bmenrigh@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Wed, 2 Sep 2009 02:03:22 +0000
Subject: [PATCH] This commit adds a new routine to nbase_rnd.c that generates
 32bit numbers in a collision-free way for a full 2^32 cycle.  This allows
 Nmap to generate random IPs with -iR that don't have duplicates.

See:
http://seclists.org/nmap-dev/2009/q3/0695.html

How this is done is documented in the code.
---
 nmap.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nmap.cc b/nmap.cc
index 2ab5b4677..4cac84af2 100644
--- a/nmap.cc
+++ b/nmap.cc
@@ -425,7 +425,7 @@ static char *grab_next_host_spec(FILE *inputfd, int argc, char **fakeargv) {
 
   if (o.generate_random_ips) {
     do {
-      ip.s_addr = get_random_u32();
+      ip.s_addr = get_random_unique_u32();
     } while (ip_is_reserved(&ip));
     Strncpy(host_spec, inet_ntoa(ip), sizeof(host_spec));
   } else if (!inputfd) {