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Get MAC address under io-pkt
 
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Applicable Environment
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  • Topic: Get MAC address under io-pkt
  • SDP: 6.4.1, 6.5.0
  • Target: Any supported target
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Recommendation
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#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if_dl.h>
#include <ifaddrs.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char ** argv)
{
struct ifaddrs *ifaphead;
unsigned char * if_mac;
int found = 0;
struct ifaddrs *ifap;
struct sockaddr_dl *sdl = NULL;

if (argc < 2)
{
fprintf(stderr,"usage:\n");
fprintf(stderr,"\t %s <interface name>\n",argv[0]);
exit(1);
}

if (getifaddrs(&ifaphead) != 0)
{
perror("get_if_name: getifaddrs() failed");
exit(1);
}

for (ifap = ifaphead; ifap && !found; ifap = ifap->ifa_next)
{
if ((ifap->ifa_addr->sa_family == AF_LINK))
{
if (strlen(ifap->ifa_name) == strlen(argv[1]))
if (strcmp(ifap->ifa_name,argv[1]) == 0)
{
found = 1;
sdl = (struct sockaddr_dl *)ifap->ifa_addr;
if (sdl)
{
/* I was returning this from a function before converting
* this snippet, which is why I make a copy here on the heap */
if_mac = malloc(sdl->sdl_alen);
memcpy(if_mac, LLADDR(sdl), sdl->sdl_alen);
}
}
}
}
if (!found)
{
fprintf (stderr,"Can't find interface %s.\n",argv[1]);
if(ifaphead)
freeifaddrs(ifaphead);
exit(1);
}

fprintf (stdout, "%02X%02X%02X%02X%02X%02X\n",
if_mac[0] , if_mac[1] , if_mac[2] ,
if_mac[3] , if_mac[4] , if_mac[5] );

if(ifaphead)
freeifaddrs(ifaphead);

exit(0);
}

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NOTE: This entry has been validated against the SDP version listed above. Use caution when considering this advice for any other SDP version. For supported releases, please reach out to QNX Technical Support if you have any questions/concerns.
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