diff options
| -rw-r--r-- | tools/.gitignore | 1 | ||||
| -rw-r--r-- | tools/Makefile | 4 | ||||
| -rw-r--r-- | tools/gen_ethaddr_crc.c | 75 |
3 files changed, 80 insertions, 0 deletions
diff --git a/tools/.gitignore b/tools/.gitignore index cb1e722..0d1f076 100644 --- a/tools/.gitignore +++ b/tools/.gitignore @@ -6,6 +6,7 @@ /fit_check_sign /fit_info /gen_eth_addr +/gen_ethaddr_crc /ifdtool /img2srec /kwboot diff --git a/tools/Makefile b/tools/Makefile index 5e089c9..eca8ecc 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -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 diff --git a/tools/gen_ethaddr_crc.c b/tools/gen_ethaddr_crc.c new file mode 100644 index 0000000..fe9896d --- /dev/null +++ b/tools/gen_ethaddr_crc.c @@ -0,0 +1,75 @@ +/* + * (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; +} |