Patch by Robert Scheck <robert@fedoraproject.org> for libnet >= 1.1.4, which backports
capability support instead of explicitly checking for UID 0. Further information can be
found at the following links:

 - https://bugzilla.redhat.com/show_bug.cgi?id=589770
 - http://github.com/sam-github/libnet/commit/671742244c20804c9e935326e3649dac3382f17a

--- libnet-1.1.4/src/libnet_init.c			2009-06-05 02:31:44.000000000 +0200
+++ libnet-1.1.4/src/libnet_init.c.capability		2010-07-09 22:57:10.000000000 +0200
@@ -44,14 +44,7 @@
 {
     libnet_t *l = NULL;
 
-#if !defined(__WIN32__)
-    if (getuid() && geteuid())
-    {
-        snprintf(err_buf, LIBNET_ERRBUF_SIZE,
-                "%s(): UID or EUID of 0 required\n", __func__);
-        goto bad;
-    }
-#else
+#if defined(__WIN32__)
     WSADATA wsaData;
 
     if ((WSAStartup(0x0202, &wsaData)) != 0)
--- libnet-1.1.4/src/libnet_link_linux.c		2009-06-05 02:31:44.000000000 +0200
+++ libnet-1.1.4/src/libnet_link_linux.c.capability	2010-07-09 22:58:33.000000000 +0200
@@ -90,8 +90,15 @@
 
     if (ioctl(l->fd, SIOCGIFHWADDR, &ifr) < 0 )
     {
-        snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
-                "SIOCGIFHWADDR: %s", strerror(errno));
+        if (errno == EPERM) {
+            snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
+                     "%s(): UID/EUID 0 or capability CAP_NET_RAW required",
+                     __func__);
+
+        } else {
+            snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
+                     "socket: %s", strerror(errno));
+        }
         goto bad;
     }