Check NMAP_PRIVILEGED and NMAP_UNPRIVILEGED in Zenmap is_root.

You won't get the "you're not root" dialog if NMAP_PRIVILEGED is set.
Patch by Tyler Wagner.
http://seclists.org/nmap-dev/2013/q1/87

CHANGELOG

@@ -1,5 +1,8 @@
 # Nmap Changelog ($Id$); -*-text-*-
 
+o [Zenmap] Zenmap now understands the NMAP_PRIVILEGED and
+  NMAP_UNPRIVILEGED environment variables. [Tyler Wagner]
+
 o It's now possible to mix IPv4 range notation with CIDR netmasks in
   target specifications. For example, 192.168-170.4-100,200.5/16 is
   effectively the same as 192.168.168-170.0-255.0-255. [David Fifield]

zenmap/zenmapGUI/App.py

@@ -168,6 +168,11 @@ def main_is_frozen():
             or imp.is_frozen("__main__")) # tools/freeze
 
 def is_root():
+    if 'NMAP_PRIVILEGED' in os.environ:
+        return True
+    elif 'NMAP_UNPRIVILEGED' in os.environ:
+        return False
+    else:
         return sys.platform == "win32" or os.getuid() == 0 or is_maemo()
 
 def install_excepthook():