Don't explicitly check for UID 0, we may have capabilities even if not root.

Author: ThomasHabets

libnet/src/libnet_init.c

@@ -44,14 +44,7 @@ libnet_init(int injection_type, const char *device, char *err_buf)
 {
     libnet_t *l = NULL;
 
-#if !defined(__WIN32__)
-    if ((injection_type != LIBNET_NONE) && getuid() && geteuid())
-    {
-        snprintf(err_buf, LIBNET_ERRBUF_SIZE,
-                "%s(): UID or EUID of 0 required", __func__);
-        goto bad;
-    }
-#else
+#if defined(__WIN32__)
     WSADATA wsaData;
 
     if ((WSAStartup(0x0202, &wsaData)) != 0)

libnet/src/libnet_link_linux.c

@@ -87,8 +87,15 @@ libnet_open_link(libnet_t *l)
 #endif
     if (l->fd == -1)
     {
-        snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
-                "socket: %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;
     }
 
@@ -299,5 +306,11 @@ libnet_get_hwaddr(libnet_t *l)
     return (NULL);
 }
 
+/* ---- Emacs Variables ----
+ * Local Variables:
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
 
 /* EOF */