The current JUCE code only finds the active network interface MAC address.
The following code finds every network interface and gives its MAC:
#include <stdio.h> //printf
#include <string.h> //strncpy
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h> //ifreq
#include <ifaddrs.h> //ifreq
#include <unistd.h> //close
void findAllAddresses (Array<MACAddress>& result)
{
struct ifreq ifr;
struct ifaddrs * addrs = 0;
if (getifaddrs(&addrs) == -1) return;
const int s = socket (AF_INET, SOCK_DGRAM, 0);
if (s == -1)
{
freeifaddrs(addrs);
return;
}
struct ifaddrs * thisaddr = addrs;
while (thisaddr)
{
ifr.ifr_addr.sa_family = AF_INET;
strcpy(ifr.ifr_name, thisaddr->ifa_name);
if (0 == ioctl(s, SIOCGIFHWADDR, &ifr))
{
MACAddress ma ((const uint8*) ifr.ifr_hwaddr.sa_data);
if (! ma.isNull())
result.addIfNotAlreadyThere (ma);
}
thisaddr = thisaddr->ifa_next;
}
freeifaddrs(addrs);
close(s);
}