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authorcyrus <cyrus@3c298f89-4303-0410-b956-a3cf2f4a3e73>2013-06-06 09:52:00 +0000
committercyrus <cyrus@3c298f89-4303-0410-b956-a3cf2f4a3e73>2013-06-06 09:52:00 +0000
commitecb7a97e94e2828b0769819a5a55a4c30ad95138 (patch)
tree6205dced200ec6aa12308c46aa9e7c3396ef7cd4 /package/base-files/files
parentb9c0e3ae29d212dc361006b698f071ba423c82b3 (diff)
base-files: use less entropy when generating ULAs
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36865 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'package/base-files/files')
-rw-r--r--package/base-files/files/etc/uci-defaults/12_network-generate-ula11
1 files changed, 4 insertions, 7 deletions
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