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: Olliver Schinagl <o.schinagl@ultimaker.com> Signed-off-by: Olliver Schinagl <oliver@schinagl.nl> Acked-by: Joe Hershberger <joe.hershberger@ni.com>

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: Olliver Schinagl <o.schinagl@ultimaker.com> Signed-off-by: Olliver Schinagl <oliver@schinagl.nl> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
oliver@schinagl.nl · Joe Hershberger
1 parent 1d3c539239
Showing 3 changed files with 80 additions and 0 deletions Side-by-side Diff
tools/.gitignore
tools/Makefile
tools/gen_ethaddr_crc.c
@@ -6,6 +6,7 @@
 /fit_check_sign
 /fit_info
 /gen_eth_addr
+/gen_ethaddr_crc
 /ifdtool
 /img2srec
 /kwboot
@@ -43,6 +43,10 @@
 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;
+}
...	...	@@ -6,6 +6,7 @@
6	6	/fit_check_sign
7	7	/fit_info
8	8	/gen_eth_addr
	9	+/gen_ethaddr_crc
9	10	/ifdtool
10	11	/img2srec
11	12	/kwboot
...	...	@@ -43,6 +43,10 @@
43	43	hostprogs-$(CONFIG_CMD_NET) += gen_eth_addr
44	44	HOSTCFLAGS_gen_eth_addr.o := -pedantic
45	45
	46	+hostprogs-$(CONFIG_CMD_NET) += gen_ethaddr_crc
	47	+gen_ethaddr_crc-objs := gen_ethaddr_crc.o lib/crc8.o
	48	+HOSTCFLAGS_gen_ethaddr_crc.o := -pedantic
	49	+
46	50	hostprogs-$(CONFIG_CMD_LOADS) += img2srec
47	51	HOSTCFLAGS_img2srec.o := -pedantic
48	52
	1	+/*
	2	+ * (C) Copyright 2016
	3	+ * Olliver Schinagl <oliver@schinagl.nl>
	4	+ *
	5	+ * SPDX-License-Identifier: GPL-2.0+
	6	+ */
	7	+
	8	+#include <ctype.h>
	9	+#include <stdint.h>
	10	+#include <stdio.h>
	11	+#include <stdlib.h>
	12	+#include <string.h>
	13	+#include <u-boot/crc.h>
	14	+
	15	+#define ARP_HLEN 6 /* Length of hardware address */
	16	+#define ARP_HLEN_ASCII (ARP_HLEN * 2) + (ARP_HLEN - 1) /* with separators */
	17	+#define ARP_HLEN_LAZY (ARP_HLEN * 2) /* separatorless hardware address length */
	18	+
	19	+uint8_t nibble_to_hex(const char *nibble, bool lo)
	20	+{
	21	+ return (strtol(nibble, NULL, 16) << (lo ? 0 : 4)) & (lo ? 0x0f : 0xf0);
	22	+}
	23	+
	24	+int process_mac(const char *mac_address)
	25	+{
	26	+ uint8_t ethaddr[ARP_HLEN + 1] = { 0x00 };
	27	+ uint_fast8_t i = 0;
	28	+
	29	+ while (*mac_address != '\0') {
	30	+ char nibble[2] = { 0x00, '\n' }; /* for strtol */
	31	+
	32	+ nibble[0] = *mac_address++;
	33	+ if (isxdigit(nibble[0])) {
	34	+ if (isupper(nibble[0]))
	35	+ nibble[0] = tolower(nibble[0]);
	36	+ ethaddr[i >> 1] \|= nibble_to_hex(nibble, (i % 2) != 0);
	37	+ i++;
	38	+ }
	39	+ }
	40	+
	41	+ for (i = 0; i < ARP_HLEN; i++)
	42	+ printf("%.2x", ethaddr[i]);
	43	+ printf("%.2x\n", crc8(0, ethaddr, ARP_HLEN));
	44	+
	45	+ return 0;
	46	+}
	47	+
	48	+void print_usage(char *cmdname)
	49	+{
	50	+ printf("Usage: %s <mac_address>\n", cmdname);
	51	+ puts("<mac_address> may be with or without separators.");
	52	+ puts("Valid seperators are ':' and '-'.");
	53	+ puts("<mac_address> digits are in base 16.\n");
	54	+}
	55	+
	56	+int main(int argc, char *argv[])
	57	+{
	58	+ if (argc < 2) {
	59	+ print_usage(argv[0]);
	60	+ return 1;
	61	+ }
	62	+
	63	+ if (!((strlen(argv[1]) == ARP_HLEN_ASCII) \|\| (strlen(argv[1]) == ARP_HLEN_LAZY))) {
	64	+ puts("The MAC address is not valid.\n");
	65	+ print_usage(argv[0]);
	66	+ return 1;
	67	+ }
	68	+
	69	+ if (process_mac(argv[1])) {
	70	+ puts("Failed to calculate the MAC's checksum.");
	71	+ return 1;
	72	+ }
	73	+
	74	+ return 0;
	75	+}