diff -rupN orig/uuid.c patched/uuid.c
--- orig/uuid.c	2008-03-07 11:49:59.000000000 +0100
+++ patched/uuid.c	2019-11-05 17:51:43.000000000 +0100
@@ -135,7 +135,7 @@ uuid_rc_t uuid_create(uuid_t **uuid)
     /* resolve MAC address for insertion into node field of UUIDs */
     if (!mac_address((unsigned char *)(obj->mac), sizeof(obj->mac))) {
         memset(obj->mac, 0, sizeof(obj->mac));
-        obj->mac[0] = BM_OCTET(1,0,0,0,0,0,0,0);
+        obj->mac[0] = IEEE_MAC_MCBIT;
     }
 
     /* initialize time attributes */
@@ -967,7 +967,7 @@ static uuid_rc_t uuid_make_v1(uuid_t *uu
      *  GENERATE NODE
      */
 
-    if ((mode & UUID_MAKE_MC) || (uuid->mac[0] & BM_OCTET(1,0,0,0,0,0,0,0))) {
+    if ((mode & UUID_MAKE_MC) || (uuid->mac[0] & IEEE_MAC_MCBIT)) {
         /* generate random IEEE 802 local multicast MAC address */
         if (prng_data(uuid->prng, (void *)&(uuid->obj.node), sizeof(uuid->obj.node)) != PRNG_RC_OK)
             return UUID_RC_INT;
@@ -1214,4 +1214,3 @@ unsigned long uuid_version(void)
 {
     return (unsigned long)(_UUID_VERSION);
 }
-
diff -rupN orig/uuid_mac.c patched/uuid_mac.c
--- orig/uuid_mac.c	2008-03-07 11:49:59.000000000 +0100
+++ patched/uuid_mac.c	2019-11-07 14:09:09.000000000 +0100
@@ -122,26 +122,40 @@ int mac_address(unsigned char *data_ptr,
     }
 #endif
 
-#if defined(HAVE_NET_IF_H) && defined(SIOCGIFHWADDR)
+#if defined(HAVE_NET_IF_H) && defined(SIOCGIFCONF) && defined(SIOCGIFHWADDR)
     /* use SIOCGIFHWADDR ioctl(2) on Linux class platforms */
     {
-        struct ifreq ifr;
+        struct ifreq ifrs[16];
+        struct ifconf ifc;
         struct sockaddr *sa;
         int s;
-        int i;
+        int i, j;
+        int empty;
 
         if ((s = socket(PF_INET, SOCK_DGRAM, 0)) < 0)
             return FALSE;
-        sprintf(ifr.ifr_name, "eth0");
-        if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0) {
+        ifc.ifc_len = sizeof(ifrs);
+        ifc.ifc_req = ifrs;
+        if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
             close(s);
             return FALSE;
         }
-        sa = (struct sockaddr *)&ifr.ifr_addr;
-        for (i = 0; i < MAC_LEN; i++)
-            data_ptr[i] = (unsigned char)(sa->sa_data[i] & 0xff);
+        for (i = 0; i < ifc.ifc_len / sizeof(ifrs[0]); i++) {
+            if (ioctl(s, SIOCGIFHWADDR, &ifrs[i]) < 0)
+                continue;
+            sa = (struct sockaddr *)&(ifrs[i].ifr_hwaddr);
+            empty = TRUE;
+            for (j = 0; j < MAC_LEN; j++) {
+                empty &= (sa->sa_data[j] & 0xff) == 0x00;
+                data_ptr[j] = (unsigned char)(sa->sa_data[j] & 0xff);
+            }
+            if (empty)
+                continue;
+            close(s);
+            return TRUE;
+        }
         close(s);
-        return TRUE;
+        return FALSE;
     }
 #endif
 
@@ -180,4 +194,3 @@ int mac_address(unsigned char *data_ptr,
 
     return FALSE;
 }
-