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| author | David Bauer <mail@david-bauer.net> | 2020-07-11 13:48:40 +0200 |
|---|---|---|
| committer | David Bauer <mail@david-bauer.net> | 2020-07-28 15:52:44 +0200 |
| commit | c3e252d08032de80e7c82759cc9763a310a97144 (patch) | |
| tree | 32dda0aced50b6a1feff389d9f72e0c5aa7f61c8 /package/base-files/files/lib | |
| parent | 04f06787f1c0f1d89f6b8c71430d0d0bbb62ffa5 (diff) | |
| download | upstream-c3e252d08032de80e7c82759cc9763a310a97144.tar.gz upstream-c3e252d08032de80e7c82759cc9763a310a97144.tar.bz2 upstream-c3e252d08032de80e7c82759cc9763a310a97144.zip | |
base-files: add function for generating random MAC
This adds a function for generating a valid random MAC address (unset MC
bit / set locally administered bit).
It is necessary for devices which do not have a MAC address programmed
by the manufacturer.
Signed-off-by: David Bauer <mail@david-bauer.net>
Diffstat (limited to 'package/base-files/files/lib')
| -rw-r--r-- | package/base-files/files/lib/functions/system.sh | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/package/base-files/files/lib/functions/system.sh b/package/base-files/files/lib/functions/system.sh index f3c901ff79..80e417182a 100644 --- a/package/base-files/files/lib/functions/system.sh +++ b/package/base-files/files/lib/functions/system.sh @@ -174,6 +174,18 @@ macaddr_setbit_la() { macaddr_setbit $1 7 } +macaddr_unsetbit_mc() { + local mac=$1 + + printf "%02x:%s" $((0x${mac%%:*} & ~0x01)) ${mac#*:} +} + +macaddr_random() { + local randsrc=$(get_mac_binary /dev/urandom 0) + + echo "$(macaddr_unsetbit_mc "$(macaddr_setbit_la "${randsrc}")")" +} + macaddr_2bin() { local mac=$1 |