Allow to join the network without email/token

re6st-conf

@@ -30,6 +30,9 @@ def main():
         help="Email address where your token is sent. Use -r option if you"
              " want to show an email in your certificate.")
     _('--token', help="The token you received.")
+    _('--anonymous', action='store_true',
+        help="Request an anonymous certificate. No email is required but the"
+             " registry may deliver a longer prefix.")
     config = parser.parse_args()
     if config.dir:
         os.chdir(config.dir)
@@ -39,7 +42,7 @@ def main():
     dh_path = 'dh2048.pem'
 
     # Establish connection with server
-    s = xmlrpclib.ServerProxy(config.registry)
+    s = xmlrpclib.ServerProxy(config.registry, allow_none=True)
 
     # Get CA
     create(ca_path, s.getCa())
@@ -74,7 +77,10 @@ def main():
 
     cert_fd = token_advice = None
     try:
-        if not config.token:
+        if config.anonymous:
+            if not (config.token is config.email is None):
+                parser.error("--anonymous conflicts with --email/--token")
+        elif not config.token:
             if not config.email:
                 config.email = raw_input('Please enter your email address: ')
             s.requestToken(config.email)

re6st-registry

@@ -72,8 +72,11 @@ class main(object):
         _('--private',
                 help="re6stnet IP of the node on which runs the registry."
                      " Required for normal operation.")
-        _('--prefix-length', default=16,
+        _('--prefix-length', default=16, type=int,
                 help="Default length of allocated prefixes.")
+        _('--anonymous-prefix-length', type=int,
+                help="Length of allocated anonymous prefixes."
+                     " If 0 or unset, registration by email is required")
         _('-l', '--logfile', default='/var/log/re6stnet/registry.log',
                 help="Path to logging file.")
         _('-v', '--verbose', default=1, type=int,
@@ -199,8 +202,16 @@ class main(object):
         try:
             req = crypto.load_certificate_request(crypto.FILETYPE_PEM, cert_req)
             with self.db:
+                if token is None:
+                    prefix_len = self.config.anonymous_prefix_length
+                    if not prefix_len:
+                        return
+                    email = None
+                else:
                     try:
-                    token, email, prefix_len, _ = self.db.execute("SELECT * FROM token WHERE token = ?", (token,)).next()
+                        token, email, prefix_len, _ = self.db.execute(
+                            "SELECT * FROM token WHERE token = ?",
+                            (token,)).next()
                     except StopIteration:
                         return
                     self.db.execute("DELETE FROM token WHERE token = ?", (token,))