Add DHCP Client libs and VPP sends DHCPv4 Discover test

[csit.git] / resources / libraries / python / Dhcp.py

diff --git a/resources/libraries/python/Dhcp.py b/resources/libraries/python/Dhcp.py
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+++ b/resources/libraries/python/Dhcp.py
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+# Copyright (c) 2016 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""DHCP utilities for VPP."""
+
+
+from resources.libraries.python.VatExecutor import VatExecutor
+from resources.libraries.python.topology import Topology
+
+
+class DhcpClient(object):
+    """DHCP Client utilities."""
+
+    @staticmethod
+    def set_dhcp_client_on_interface(vpp_node, interface, hostname=None):
+        """Set DHCP client on interface.
+
+        :param vpp_node: VPP node to set DHCP client on.
+        :param interface: Interface name to set DHCP client on.
+        :param hostname: Hostname used in DHCP DISCOVER.
+        :type vpp_node: dict
+        :type interface: str
+        :type hostname: str
+        :raises RuntimeError: If unable to set DHCP client on interface.
+        """
+        sw_if_index = Topology.get_interface_sw_index(vpp_node, interface)
+        interface = 'sw_if_index {}'.format(sw_if_index)
+        hostname = 'hostname {}'.format(hostname) if hostname else ''
+        output = VatExecutor.cmd_from_template(vpp_node,
+                                               "dhcp_client.vat",
+                                               interface=interface,
+                                               hostname=hostname)
+        output = output[0]
+
+        if output["retval"] != 0:
+            raise RuntimeError('Unable to set DHCP client on node {} and'
+                               ' interface {}.'
+                               .format(vpp_node, interface))