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base-files: use less entropy when generating ULAs

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SVN-Revision: 36865
This commit is contained in:
Steven Barth
2013-06-06 09:52:00 +00:00
parent 2befaa2f0d
commit 3f67360012
2 changed files with 5 additions and 8 deletions
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11
package/base-files/files/etc/uci-defaults/12_network-generate-ula
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@@ -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