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6b4e705b26
Regarding: https://misterfpga.org/viewtopic.php?t=3661 1. The reason hexdump fails is because of not using the hexdump "-v" parameter -v Cause hexdump to display all input data. Without the -v option, any number of groups of output lines, which would be identical to the immediately preceding group of output lines (except for the input offsets), are replaced with a line comprised of a single asterisk. and therefor the c-style $(( )) arithmetic would fail if a group is replaced with a single asterisk 2. & 0xFEFFFFFFFFFF | 0x020000000000 should be replaced by & 0xFCFFFFFFFFFF as you want to zero the last two bits, namely Universal vs local (U/L bit) and the Unicast vs multicast (I/G bit), otherwise you will not generate a valid MAC address. 3. write MAC address in uppercase with the ^^
51 lines
1.9 KiB
Bash
51 lines
1.9 KiB
Bash
#!/bin/bash
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Copyright 2019 Alessandro "Locutus73" Miele
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# You can download the latest version of this script from:
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# https://github.com/MiSTer-devel/Scripts_MiSTer
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# Version 1.0 - 2019-05-13 - First commit
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# ========= OPTIONS ==================
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MAC_ADDRESS=""
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# ========= CODE STARTS HERE =========
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# get the name of the script, or of the parent script if called through a 'curl ... | bash -'
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ORIGINAL_SCRIPT_PATH="${0}"
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[[ "${ORIGINAL_SCRIPT_PATH}" == "bash" ]] && \
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ORIGINAL_SCRIPT_PATH="$(ps -o comm,pid | awk -v PPID=${PPID} '$2 == PPID {print $1}')"
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# ini file can contain user defined variables (as bash commands)
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# Load and execute the content of the ini file, if there is one
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INI_PATH="${ORIGINAL_SCRIPT_PATH%.*}.ini"
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if [[ -f "${INI_PATH}" ]] ; then
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TMP=$(mktemp)
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# preventively eliminate DOS-specific format and exit command
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dos2unix < "${INI_PATH}" 2> /dev/null | grep -v "^exit" > ${TMP}
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source ${TMP}
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rm -f ${TMP}
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fi
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# generate new MAC address
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MAC_ADDRESS="$(printf "%012x" $(( 0x$(hexdump -n6 -ve '/1 "%02X"' /dev/urandom) & 0xFCFFFFFFFFFF )) | sed 's/../:&/2g;s/^://')"
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echo "ethaddr=${MAC_ADDRESS^^}" > /media/fat/linux/u-boot.txt
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echo -e "The new MAC address is:\n${MAC_ADDRESS^^}\nit will become effective\non next reboot.\n"
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exit 0
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