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/*
** OSSP uuid - Universally Unique Identifier
** Copyright (c) 2004-2008 Ralf S. Engelschall <rse@engelschall.com>
** Copyright (c) 2004-2008 The OSSP Project <http://www.ossp.org/>
**
** This file is part of OSSP uuid, a library for the generation
** of UUIDs which can found at http://www.ossp.org/pkg/lib/uuid/
**
** Permission to use, copy, modify, and distribute this software for
** any purpose with or without fee is hereby granted, provided that
** the above copyright notice and this permission notice appear in all
** copies.
**
** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
** USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
** OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
** SUCH DAMAGE.
**
** uuid_mac.c: Media Access Control (MAC) resolver implementation
*/
/* own headers (part (1/2) */
#include "config.h"
#define __EXTENSIONS__ // illumos
/* system headers */
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#ifdef HAVE_NET_IF_DL_H
#include <net/if_dl.h>
#endif
#ifdef HAVE_NET_IF_ARP_H
#include <net/if_arp.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_IFADDRS_H
#include <ifaddrs.h>
#endif
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#define NOMINMAX
#include <Windows.h>
#include <winsock2.h>
#include <iphlpapi.h>
#endif
/* own headers (part (1/2) */
#include "uuid_mac.h"
/* IEEE 802 MAC address encoding/decoding bit fields */
#define IEEE_MAC_MCBIT 0b00000001
#define min(a, b) ((a) < (b) ? (a) : (b))
/* return the Media Access Control (MAC) address of the first network interface card (NIC) with a non-multicast address */
bool mac_address(uint8_t * data_ptr) {
#ifdef HAVE_IFADDRS_H
struct ifaddrs *alloc = NULL, addr = {.ifa_name = "eth0", .ifa_flags = IFF_UP | IFF_BROADCAST}, *itr = &addr;
if(getifaddrs(&alloc) == -1)
alloc = NULL;
else
itr = alloc;
bool ret = false;
#if defined(HAVE_NET_IF_DL_H) // BSD class platforms (xxxBSD, MacOS X, etc)
for(; itr; itr = itr->ifa_next)
if(itr->ifa_addr != NULL && itr->ifa_addr->sa_family == AF_LINK) {
struct sockaddr_dl * sdl = (void *)itr->ifa_addr;
uint8_t * mac = (void *)(sdl->sdl_data + sdl->sdl_nlen);
if(sdl->sdl_alen && !(mac[0] & IEEE_MAC_MCBIT)) {
memcpy(data_ptr, mac, min(MAC_LEN, sdl->sdl_alen));
ret = true;
break;
}
}
#endif
#if defined(HAVE_NET_IF_H) && defined(SIOCGIFHWADDR) // Linux and the illumos gate
int s = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
if(s == -1)
return false;
for(; itr; itr = itr->ifa_next)
if((itr->ifa_flags & IFF_UP) && (itr->ifa_flags & IFF_BROADCAST)) {
struct ifreq ifr;
strncpy(ifr.ifr_name, itr->ifa_name, sizeof(ifr.ifr_name));
if(ioctl(s, SIOCGIFHWADDR, &ifr) == -1)
continue;
if(ifr.ifr_addr.sa_data[0] & IEEE_MAC_MCBIT)
continue;
memcpy(data_ptr, ifr.ifr_addr.sa_data, MAC_LEN);
ret = true;
goto ret;
}
ret:
close(s);
#endif
if(alloc)
freeifaddrs(alloc);
return ret;
#elif defined(_WIN32)
IP_ADAPTER_ADDRESSES * alloc = NULL;
ULONG itr_size = 0;
bool ret = false;
for(;;)
switch(GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_INCLUDE_ALL_COMPARTMENTS, NULL, alloc, &itr_size)) {
case ERROR_SUCCESS:
for(IP_ADAPTER_ADDRESSES * itr = alloc; itr; itr = itr->Next)
if(itr->IfType == IF_TYPE_ETHERNET_CSMACD && !(itr->PhysicalAddress[0] & IEEE_MAC_MCBIT)) {
memcpy(data_ptr, itr->PhysicalAddress, min(MAC_LEN, itr->PhysicalAddressLength));
ret = true;
goto ret;
}
break;
case ERROR_BUFFER_OVERFLOW: {
void * new = realloc(alloc, itr_size);
if(!new)
goto ret;
alloc = new;
} break;
default:
goto ret;
}
ret:
free(alloc);
return ret;
#endif
return false;
}
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