+++ /dev/null
-/*
- * MAC address manupulation utility
- *
- * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published
- * by the Free Software Foundation.
- *
- */
-
-#include <errno.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdint.h>
-#include <string.h>
-#include <unistd.h>
-
-#define MAC_ADDRESS_LEN 6
-
-#define ERR_INVALID 1
-#define ERR_IO 2
-
-static void usage(void);
-
-char *maccalc_name;
-
-static int parse_mac(const char *mac_str, unsigned char *buf)
-{
- int t;
-
- t = sscanf(mac_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
- &buf[0], &buf[1], &buf[2], &buf[3], &buf[4], &buf[5]);
-
- if (t != MAC_ADDRESS_LEN)
- return ERR_INVALID;
-
- return 0;
-}
-
-static void print_mac(unsigned char *buf)
-{
- printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
- buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
-}
-
-static int maccalc_do_add(int argc, const char *argv[])
-{
- unsigned char mac[MAC_ADDRESS_LEN];
- uint32_t t;
- int err;
- int i;
-
- if (argc != 2) {
- usage();
- return ERR_INVALID;
- }
-
- err = parse_mac(argv[0], mac);
- if (err)
- return err;
-
- i = atoi(argv[1]);
-
- t = (mac[3] << 16) | (mac[4] << 8) | mac[5];
- t += i;
- mac[3] = (t >> 16) & 0xff;
- mac[4] = (t >> 8) & 0xff;
- mac[5] = t & 0xff;
-
- print_mac(mac);
- return 0;
-}
-
-static int maccalc_do_logical(int argc, const char *argv[],
- unsigned char (*op)(unsigned char n1,
- unsigned char n2))
-{
- unsigned char mac1[MAC_ADDRESS_LEN];
- unsigned char mac2[MAC_ADDRESS_LEN];
- int err;
- int i;
-
- if (argc != 2) {
- usage();
- return ERR_INVALID;
- }
-
- err = parse_mac(argv[0], mac1);
- if (err)
- return err;
-
- err = parse_mac(argv[1], mac2);
- if (err)
- return err;
-
- for (i = 0; i < MAC_ADDRESS_LEN; i++)
- mac1[i] = op(mac1[i],mac2[i]);
-
- print_mac(mac1);
- return 0;
-}
-
-static int maccalc_do_mac2bin(int argc, const char *argv[])
-{
- unsigned char mac[MAC_ADDRESS_LEN];
- ssize_t c;
- int err;
-
- if (argc != 1) {
- usage();
- return ERR_INVALID;
- }
-
- err = parse_mac(argv[0], mac);
- if (err)
- return err;
-
- c = write(STDOUT_FILENO, mac, sizeof(mac));
- if (c != sizeof(mac)) {
- fprintf(stderr, "failed to write to stdout\n");
- return ERR_IO;
- }
-
- return 0;
-}
-
-static ssize_t read_safe(int fd, void *buf, size_t count)
-{
- ssize_t total = 0;
- ssize_t r;
-
- while(count > 0) {
- r = read(fd, buf, count);
- if (r == 0)
- /* EOF */
- break;
- if (r < 0) {
- if (errno == EINTR)
- /* interrupted by a signal, restart */
- continue;
- /* error */
- total = -1;
- break;
- }
-
- /* ok */
- total += r;
- count -= r;
- buf += r;
- }
-
- return total;
-}
-
-static int maccalc_do_bin2mac(int argc, const char *argv[])
-{
- unsigned char mac[MAC_ADDRESS_LEN];
- ssize_t c;
-
- if (argc != 0) {
- usage();
- return ERR_INVALID;
- }
-
- c = read_safe(STDIN_FILENO, mac, sizeof(mac));
- if (c != sizeof(mac)) {
- fprintf(stderr, "failed to read from stdin\n");
- return ERR_IO;
- }
-
- print_mac(mac);
- return 0;
-}
-
-static unsigned char op_or(unsigned char n1, unsigned char n2)
-{
- return n1 | n2;
-}
-
-static int maccalc_do_or(int argc, const char *argv[])
-{
- return maccalc_do_logical(argc, argv, op_or);
-}
-
-static unsigned char op_and(unsigned char n1, unsigned char n2)
-{
- return n1 & n2;
-}
-
-static int maccalc_do_and(int argc, const char *argv[])
-{
- return maccalc_do_logical(argc, argv, op_and);
-}
-
-static unsigned char op_xor(unsigned char n1, unsigned char n2)
-{
- return n1 ^ n2;
-}
-
-static int maccalc_do_xor(int argc, const char *argv[])
-{
- return maccalc_do_logical(argc, argv, op_xor);
-}
-
-static void usage(void)
-{
- fprintf(stderr,
- "Usage: %s <command>\n"
- "valid commands:\n"
- " add <mac> <number>\n"
- " and|or|xor <mac1> <mac2>\n"
- " mac2bin <mac>\n"
- " bin2mac\n",
- maccalc_name);
-}
-
-int main(int argc, const char *argv[])
-{
- int (*op)(int argc, const char *argv[]);
- int ret;
-
- maccalc_name = (char *) argv[0];
-
- if (argc < 2) {
- usage();
- return EXIT_FAILURE;
- }
-
- if (strcmp(argv[1], "add") == 0) {
- op = maccalc_do_add;
- } else if (strcmp(argv[1], "and") == 0) {
- op = maccalc_do_and;
- } else if (strcmp(argv[1], "or") == 0) {
- op = maccalc_do_or;
- } else if (strcmp(argv[1], "xor") == 0) {
- op = maccalc_do_xor;
- } else if (strcmp(argv[1], "mac2bin") == 0) {
- op = maccalc_do_mac2bin;
- } else if (strcmp(argv[1], "bin2mac") == 0) {
- op = maccalc_do_bin2mac;
- } else {
- fprintf(stderr, "unknown command '%s'\n", argv[1]);
- usage();
- return EXIT_FAILURE;
- }
-
- argc -= 2;
- argv += 2;
-
- ret = op(argc, argv);
- if (ret)
- return EXIT_FAILURE;
-
- return EXIT_SUCCESS;
-}
projects / openwrt / svn-archive / archive.git / blobdiff