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base-files: add function for generating random MAC

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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>
This commit is contained in:
David Bauer 2020-07-11 13:48:40 +02:00
parent 04f06787f1
commit c3e252d080
2 changed files with 13 additions and 1 deletions
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2
package/base-files/Makefile
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@ -12,7 +12,7 @@ include $(INCLUDE_DIR)/version.mk
include $(INCLUDE_DIR)/feeds.mk include $(INCLUDE_DIR)/feeds.mk
PKG_NAME:=base-files PKG_NAME:=base-files
PKG_RELEASE:=223 PKG_RELEASE:=224
PKG_FLAGS:=nonshared PKG_FLAGS:=nonshared
PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/ PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/

12
package/base-files/files/lib/functions/system.sh
View File

@ -174,6 +174,18 @@ macaddr_setbit_la() {
macaddr_setbit $1 7 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() { macaddr_2bin() {
local mac=$1 local mac=$1