Make sure that values are IP addresses/ranges

This commit adds safeguarding for invalid IP address/range values.

jandd/sphinxext/ip.py

@@ -52,6 +52,17 @@ class IPXRefRole(XRefRole):
         super(IPXRefRole, self).__init__(
             innernodeclass=innernodeclass, **kwargs)
 
+    def __call__(self, typ, rawtext, text, lineno, inliner,
+                 options={}, content=[]):
+        try:
+            Network(text)
+        except ValueError as e:
+            env = inliner.document.settings.env
+            env.warn(env.docname, "invalid ip address/range %s" % text, lineno)
+            return [nodes.literal(text, text), []]
+        return super(IPXRefRole, self).__call__(
+            typ, rawtext, text, lineno, inliner, options, content)
+
     def process_link(self, env, refnode, has_explicit_title, title, target):
         domaindata = env.domaindata['ip']
         domaindata[self.method][target] = (target, refnode)