src/basic/ether-addr-util.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2014 Tom Gundersen
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <net/ethernet.h>
  21 #include <stdio.h>
  22 #include <sys/types.h>
  23
  24 #include "ether-addr-util.h"
  25 #include "macro.h"
  26
  27 char* ether_addr_to_string(const struct ether_addr *addr, char buffer[ETHER_ADDR_TO_STRING_MAX]) {
  28         assert(addr);
  29         assert(buffer);
  30
  31         /* Like ether_ntoa() but uses %02x instead of %x to print
  32          * ethernet addresses, which makes them look less funny. Also,
  33          * doesn't use a static buffer. */
  34
  35         sprintf(buffer, "%02x:%02x:%02x:%02x:%02x:%02x",
  36                 addr->ether_addr_octet[0],
  37                 addr->ether_addr_octet[1],
  38                 addr->ether_addr_octet[2],
  39                 addr->ether_addr_octet[3],
  40                 addr->ether_addr_octet[4],
  41                 addr->ether_addr_octet[5]);
  42
  43         return buffer;
  44 }
  45
  46 bool ether_addr_is_null(const struct ether_addr *addr) {
  47         assert(addr);
  48
  49         return  addr->ether_addr_octet[0] == 0 &&
  50                 addr->ether_addr_octet[1] == 0 &&
  51                 addr->ether_addr_octet[2] == 0 &&
  52                 addr->ether_addr_octet[3] == 0 &&
  53                 addr->ether_addr_octet[4] == 0 &&
  54                 addr->ether_addr_octet[5] == 0;
  55 }
  56
  57 bool ether_addr_equal(const struct ether_addr *a, const struct ether_addr *b) {
  58         assert(a);
  59         assert(b);
  60
  61         return  a->ether_addr_octet[0] == b->ether_addr_octet[0] &&
  62                 a->ether_addr_octet[1] == b->ether_addr_octet[1] &&
  63                 a->ether_addr_octet[2] == b->ether_addr_octet[2] &&
  64                 a->ether_addr_octet[3] == b->ether_addr_octet[3] &&
  65                 a->ether_addr_octet[4] == b->ether_addr_octet[4] &&
  66                 a->ether_addr_octet[5] == b->ether_addr_octet[5];
  67 }