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104 lines
2.9 KiB
Bash
104 lines
2.9 KiB
Bash
#!/bin/sh
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# Copyright (c) 2013, 2015-2016 The Linux Foundation. All rights reserved
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# Permission to use, copy, modify, and/or distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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# copyright notice and this permission notice appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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. /lib/functions.sh
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BT_OFFSET=64
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# parse cmdline
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while [ -n "$1" ]; do
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case "$1" in
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-h|--help) HELP=1; break;;
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-n) NUM="$2"; shift;;
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-b) BT_TRIM="$2"; shift;;
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-d) DELETE=1;;
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-*)
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echo "Invalid option: $1"
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ERROR=1
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break
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;;
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*) break;;
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esac
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shift
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done
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SEED="$@"
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[ -z "$SEED" -o -n "$HELP" -o -n "$ERROR" ] && {
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cat <<EOF
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Usage: $0 [-h] [-d] [-n NUM] [-b BT_TRIM] <boardID>
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setmac options:
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-n number of MAC@ to set.
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(default: number of ethX devices in the system)
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-d erase the ART sector before setting the MAC@
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-b Set BT MAC address as well as Trim value @ offset BT_OFFSET
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-h print this help
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boardID is used as a seed and expanded through md5sum to create a
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supposedly unique MAC@ suffix. Please use something that is unique
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for every board.
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Example:
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$ setmac DB149-010-N0001
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EOF
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# If we requested the help flag, then exit normally.
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# Else, it's probably an error so report it as such.
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[ -n "$HELP" ] && exit 0
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exit 1
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}
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# By default, fill-in one MAC@ per ethernet interface found in the system
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[ -z ${NUM} ] && NUM=$(ls -d /sys/class/net/eth*|wc -l)
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# Expend the seed to get pseudo-random MAC@ per device
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md5=$(echo "${SEED}" | md5sum -)
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NUM=$((${NUM}-1))
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# reduce NUM by 1 to start below loop from 0
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for dev in $(seq 0 ${NUM});do
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str="${str}\x00\x03\x7f"
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for byte in 0 2 4;do
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off=$((${byte}+6*${dev}))
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str="${str}\x${md5:${off}:2}"
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done
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done
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if [ -n "${BT_TRIM}" ]; then
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# increaement dev to past last used MAC address from md5
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dev=$((${dev}+1))
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# reset remaining bits to 0 until BT_OFFSET-1
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start=$((${off}+2))
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end=$((${BT_OFFSET}-1))
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for byte in $(seq ${start} ${end}); do
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str="${str}\x00"
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done
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# set BT MAC address
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str="${str}\x00\x03\x7f"
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for byte in 0 2 4;do
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off=$((${byte}+6*${dev}))
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str="${str}\x${md5:${off}:2}"
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done
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# set BT TRIM
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str="${str}\x${BT_TRIM}"
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fi
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echo -n -e ${str} > /tmp/macaddr
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hexdump -C /tmp/macaddr
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# If we set the delete flag, let's start by erasing the ART sector
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[ -n "${DELETE}" ] && mtd erase $(find_mtd_part art | sed 's,block,,')
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art_partition=$(find_mtd_part art)
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[ -z "$art_partition" ] && art_partition=$(find_mmc_part art)
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# Find the partition and set the MAC addresses in the flash
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dd if=/tmp/macaddr of=$art_partition bs=64 conv=sync 2>/dev/null
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rm -f /tmp/macaddr
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