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

Reduce calls and pipes and read from urandom once directly with hexdump
for the necessary 5 bytes of random data to build the 48 bit ULA Prefix.

Fewer calls and forks; finish quicker; less memory used.

Tested on: 23.05.3

Signed-off-by: Paul Donald <newtwen+github@gmail.com>
This commit is contained in:
Paul Donald 2024-03-29 16:04:30 +01:00 committed by Christian Marangi
parent b0422af1b3
commit 27edf28b11
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1 changed files with 1 additions and 5 deletions
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6
package/base-files/files/etc/uci-defaults/12_network-generate-ula
View File

@ -1,11 +1,7 @@
[ "$(uci -q get network.globals.ula_prefix)" != "auto" ] && exit 0
r1=$(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"')
uci -q batch <<-EOF >/dev/null
set network.globals.ula_prefix=fd$r1:$r2:$r3::/48
set network.globals.ula_prefix="$(hexdump -vn 5 -e '"fd" 1/1 "%02x:" 2/2 "%x:"' /dev/urandom):/48"
commit network
EOF