From e877c7b0573bc21cb40b1c27151349bed9573612 Mon Sep 17 00:00:00 2001
From: Steven Barth <steven@midlink.org>
Date: Thu, 6 Jun 2013 09:52:00 +0000
Subject: base-files: use less entropy when generating ULAs

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36865 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 .../base-files/files/etc/uci-defaults/12_network-generate-ula | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

(limited to 'package/base-files/files/etc/uci-defaults/12_network-generate-ula')

diff --git a/package/base-files/files/etc/uci-defaults/12_network-generate-ula b/package/base-files/files/etc/uci-defaults/12_network-generate-ula
index f3e493145f..56b7eb3574 100644
--- a/package/base-files/files/etc/uci-defaults/12_network-generate-ula
+++ b/package/base-files/files/etc/uci-defaults/12_network-generate-ula
@@ -1,13 +1,10 @@
 #!/bin/sh
 
 [ "$(uci get network.globals.ula_prefix)" != "auto" ] && exit 0
-# Sometimes results are empty, therefore try until it works...          
-local r1 r2 r3
-while [ -z "$r1" -o -z "$r2" -o -z "$r3" ]; do
-	r1=$(printf "%02x" $(($(</dev/urandom tr -dc 0-9 | dd bs=9 count=1) % 256)))
-	r2=$(printf "%01x" $(($(</dev/urandom tr -dc 0-9 | dd bs=9 count=1) % 65536)))
-	r3=$(printf "%01x" $(($(</dev/urandom tr -dc 0-9 | dd bs=9 count=1) % 65536)))
-done
+
+r1=$(dd if=/dev/urandom bs=1 count=1 |hexdump -e '1/1 "%02x"')
+r2=$(dd if=/dev/urandom bs=2 count=1 |hexdump -e '2/1 "%02x"')
+r3=$(dd if=/dev/urandom bs=2 count=1 |hexdump -e '2/1 "%02x"')
 
 uci -q batch <<-EOF >/dev/null
 	set network.globals.ula_prefix=fd$r1:$r2:$r3::/48
-- 
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