Validate hostnames by querying to see if the name exists in DNS, and

[invirt/packages/invirt-web.git] / code / validation.py

diff --git a/code/validation.py b/code/validation.py
index 860bac3..2f64f9a 100644 (file)
--- a/code/validation.py
+++ b/code/validation.py
@@ -4,6 +4,7 @@ import cache_acls
 import getafsgroups
 import re
 import string
+import dns.resolver
 from invirt.database import Machine, NIC, Type, Disk, CDROM, Autoinstall
 from invirt.config import structs as config
 from webcommon import InvalidInput
@@ -270,11 +271,21 @@ def testName(user, name, machine=None):
     name = name.lower()
     if machine is not None and name == machine.name:
         return None
-    if not Machine.query().filter_by(name=name).count():
+    try:
+        f = open('/tmp/log', 'a')
+        dns.resolver.query('%s.%s.' % (name, config.dns.domains[0]), 'A')
+        # If the hostname didn't exist, it would have thrown an
+        # exception by now - error out
+        raise InvalidInput('name', name, 'Name is already taken.')
+    except dns.resolver.NXDOMAIN, e:
         if not validMachineName(name):
             raise InvalidInput('name', name, 'You must provide a machine name.  Max 63 chars, alnum plus \'-\', does not begin or end with \'-\'.')
         return name
-    raise InvalidInput('name', name, "Name is already taken.")
+    except InvalidInput:
+        raise
+    except:
+        # Any other error is a validation failure
+        raise InvalidInput('name', name, 'We were unable to verify that this name is available. If you believe this is in error, please contact us at %s' % config.dns.contact)
 
 def testDescription(user, description, machine=None):
     if description is None or description.strip() == '':