Added function to get the MAC address of the Wifi network interface

getMacAddress.h

@@ -0,0 +1,2 @@
+
+NSString* getMacAddress();

getMacAddress.m

@@ -0,0 +1,60 @@
+/* Stolen from: https://gist.github.com/1409855/ */
+/* Original source code courtesy John from iOSDeveloperTips.com */
+
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+#include <net/if.h>
+#include <net/if_dl.h>
+
+NSString* getMacAddress()
+{
+    NSString    *macAddressString = NULL;
+    int         mgmtInfoBase[6];
+    char        *msgBuffer = NULL;
+    size_t      length = 0;
+
+    // Setup the management Information Base (mib)
+    mgmtInfoBase[0] = CTL_NET;        // Request network subsystem
+    mgmtInfoBase[1] = AF_ROUTE;       // Routing table info
+    mgmtInfoBase[2] = 0;              
+    mgmtInfoBase[3] = AF_LINK;        // Request link layer information
+    mgmtInfoBase[4] = NET_RT_IFLIST;  // Request all configured interfaces
+
+    // With all configured interfaces requested, get handle index
+    if ((mgmtInfoBase[5] = if_nametoindex("en0")) == 0) 
+        NSLog(@"if_nametoindex failure");
+    // Get the size of the data available (store in len)
+    else if (sysctl(mgmtInfoBase, 6, NULL, &length, NULL, 0) < 0) 
+        NSLog(@"sysctl mgmtInfoBase failure");
+    // Alloc memory based on above call
+    else if ((msgBuffer = malloc(length)) == NULL)
+        NSLog(@"buffer allocation failure");
+    // Get system information, store in buffer
+    else if (sysctl(mgmtInfoBase, 6, msgBuffer, &length, NULL, 0) < 0)
+    {
+        free(msgBuffer);
+        NSLog(@"sysctl msgBuffer failure");
+    }
+    else
+    {
+        // Map msgbuffer to interface message structure
+        struct if_msghdr *interfaceMsgStruct = (struct if_msghdr *) msgBuffer;
+
+        // Map to link-level socket structure
+        struct sockaddr_dl *socketStruct = (struct sockaddr_dl *) (interfaceMsgStruct + 1);
+
+        // Copy link layer address data in socket structure to an array
+        unsigned char macAddress[6];
+        memcpy(&macAddress, socketStruct->sdl_data + socketStruct->sdl_nlen, 6);
+
+        // Read from char array into a string object, into traditional Mac address format
+        macAddressString = [NSString stringWithFormat:@"%02X%02X%02X%02X%02X%02X",
+							macAddress[0], macAddress[1], macAddress[2],
+							macAddress[3], macAddress[4], macAddress[5]];
+
+        // Release the buffer memory
+        free(msgBuffer);
+    }
+
+    return macAddressString;
+}