[PATCH] base-files: reduce IPv6 ULA prefix generation to a single call

[Paul Donald]

Tested on: 23.05.3

Signed-off-by: Paul Donald <newtwen+github at gmail.com>
---
 .../files/etc/uci-defaults/12_network-generate-ula          | 6 ++----
 1 file changed, 2 insertions(+), 4 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 19d7ed7f2e..20b3237ec7 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
@@ -1,11 +1,9 @@
 [ "$(uci -q get network.globals.ula_prefix)" != "auto" ] && exit 0
 
-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=$(dd if=/dev/urandom bs=2 count=1 |hexdump -e '2/1 "%02x"')
+r1=$(hexdump -vn 5 -e '5/1 "%02x"' /dev/urandom)
 
 uci -q batch <<-EOF >/dev/null
-	set network.globals.ula_prefix=fd$r1:$r2:$r3::/48
+	set network.globals.ula_prefix=fd${r1:0:2}:${r1:2:4}:${r1:6:4}::/48
 	commit network
 EOF
 
-- 
2.44.0