From c3e252d08032de80e7c82759cc9763a310a97144 Mon Sep 17 00:00:00 2001 From: David Bauer Date: Sat, 11 Jul 2020 13:48:40 +0200 Subject: [PATCH] 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 --- package/base-files/Makefile | 2 +- package/base-files/files/lib/functions/system.sh | 12 ++++++++++++ 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/package/base-files/Makefile b/package/base-files/Makefile index 284899bd69ef..d32bae8635e2 100644 --- a/package/base-files/Makefile +++ b/package/base-files/Makefile @@ -12,7 +12,7 @@ include $(INCLUDE_DIR)/version.mk include $(INCLUDE_DIR)/feeds.mk PKG_NAME:=base-files -PKG_RELEASE:=223 +PKG_RELEASE:=224 PKG_FLAGS:=nonshared PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/ diff --git a/package/base-files/files/lib/functions/system.sh b/package/base-files/files/lib/functions/system.sh index f3c901ff7982..80e417182a26 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 -- 2.30.2