Commit c25f01a6 authored by oliver@schinagl.nl's avatar oliver@schinagl.nl Committed by Joe Hershberger

tools: Add tool to add crc8 to a mac address

This patch adds a little tool that takes a generic MAC address and
generates a CRC byte for it. The output is the full MAC address without
any separators, ready written into an EEPROM.
Signed-off-by: default avatarOlliver Schinagl <o.schinagl@ultimaker.com>
Signed-off-by: default avatarOlliver Schinagl <oliver@schinagl.nl>
Acked-by: default avatarJoe Hershberger <joe.hershberger@ni.com>
parent 1d3c5392
......@@ -6,6 +6,7 @@
/fit_check_sign
/fit_info
/gen_eth_addr
/gen_ethaddr_crc
/ifdtool
/img2srec
/kwboot
......
......@@ -43,6 +43,10 @@ envcrc-objs := envcrc.o lib/crc32.o common/env_embedded.o lib/sha1.o
hostprogs-$(CONFIG_CMD_NET) += gen_eth_addr
HOSTCFLAGS_gen_eth_addr.o := -pedantic
hostprogs-$(CONFIG_CMD_NET) += gen_ethaddr_crc
gen_ethaddr_crc-objs := gen_ethaddr_crc.o lib/crc8.o
HOSTCFLAGS_gen_ethaddr_crc.o := -pedantic
hostprogs-$(CONFIG_CMD_LOADS) += img2srec
HOSTCFLAGS_img2srec.o := -pedantic
......
/*
* (C) Copyright 2016
* Olliver Schinagl <oliver@schinagl.nl>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <u-boot/crc.h>
#define ARP_HLEN 6 /* Length of hardware address */
#define ARP_HLEN_ASCII (ARP_HLEN * 2) + (ARP_HLEN - 1) /* with separators */
#define ARP_HLEN_LAZY (ARP_HLEN * 2) /* separatorless hardware address length */
uint8_t nibble_to_hex(const char *nibble, bool lo)
{
return (strtol(nibble, NULL, 16) << (lo ? 0 : 4)) & (lo ? 0x0f : 0xf0);
}
int process_mac(const char *mac_address)
{
uint8_t ethaddr[ARP_HLEN + 1] = { 0x00 };
uint_fast8_t i = 0;
while (*mac_address != '\0') {
char nibble[2] = { 0x00, '\n' }; /* for strtol */
nibble[0] = *mac_address++;
if (isxdigit(nibble[0])) {
if (isupper(nibble[0]))
nibble[0] = tolower(nibble[0]);
ethaddr[i >> 1] |= nibble_to_hex(nibble, (i % 2) != 0);
i++;
}
}
for (i = 0; i < ARP_HLEN; i++)
printf("%.2x", ethaddr[i]);
printf("%.2x\n", crc8(0, ethaddr, ARP_HLEN));
return 0;
}
void print_usage(char *cmdname)
{
printf("Usage: %s <mac_address>\n", cmdname);
puts("<mac_address> may be with or without separators.");
puts("Valid seperators are ':' and '-'.");
puts("<mac_address> digits are in base 16.\n");
}
int main(int argc, char *argv[])
{
if (argc < 2) {
print_usage(argv[0]);
return 1;
}
if (!((strlen(argv[1]) == ARP_HLEN_ASCII) || (strlen(argv[1]) == ARP_HLEN_LAZY))) {
puts("The MAC address is not valid.\n");
print_usage(argv[0]);
return 1;
}
if (process_mac(argv[1])) {
puts("Failed to calculate the MAC's checksum.");
return 1;
}
return 0;
}
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