dhcp-client: T5760: add CLI option to pass user-class parameter

Example:
set interfaces ethernet eth0 dhcp-options user-class VyOS
or
set interfaces ethernet eth0 dhcp-options user-class 56:79:4f:53

(cherry picked from commit 260645d0c6ff078cc89601f3a586195902f9c18e)

3 files changed, 24 insertions, 0 deletions

diff --git a/data/templates/dhcp-client/ipv4.j2 b/data/templates/dhcp-client/ipv4.j2
index 4a5d5e54d..77905e054 100644
--- a/data/templates/dhcp-client/ipv4.j2
+++ b/data/templates/dhcp-client/ipv4.j2
@@ -25,6 +25,15 @@ interface "{{ ifname }}" {
 {%     endif %}
     send vendor-class-identifier {{ vendor_class_id }};
 {% endif %}
+{% if dhcp_options.user_class is vyos_defined %}
+{%     set user_class = dhcp_options.user_class %}
+{#   Use HEX representation of client-id as it is send in MAC-address style using hex characters. #}
+{#   If not HEX, use double quotes ASCII format #}
+{%     if not user_class.split(':') | length >= 3 %}
+{%         set user_class = '"' ~ dhcp_options.user_class ~ '"' %}
+{%     endif %}
+    send user-class {{ user_class }};
+{% endif %}
     # The request statement causes the client to request that any server responding to the
     # client send the client its values for the specified options.
     request subnet-mask, broadcast-address,{{ " routers," if dhcp_options.no_default_route is not vyos_defined }} domain-name-servers,
diff --git a/interface-definitions/include/interface/dhcp-options.xml.i b/interface-definitions/include/interface/dhcp-options.xml.i
index fff83fd5c..733512a98 100644
--- a/interface-definitions/include/interface/dhcp-options.xml.i
+++ b/interface-definitions/include/interface/dhcp-options.xml.i
@@ -43,6 +43,18 @@
         </constraint>
       </properties>
     </leafNode>
+    <leafNode name="user-class">
+      <properties>
+        <help>Identify to the DHCP server, user configurable option</help>
+        <valueHelp>
+          <format>txt</format>
+          <description>DHCP option string</description>
+        </valueHelp>
+        <constraint>
+          #include <include/constraint/dhcp-client-string-option.xml.i>
+        </constraint>
+      </properties>
+    </leafNode>
     #include <include/interface/no-default-route.xml.i>
     #include <include/interface/default-route-distance.xml.i>
     <leafNode name="reject">
diff --git a/smoketest/scripts/cli/base_interfaces_test.py b/smoketest/scripts/cli/base_interfaces_test.py
index 81240f78b..6862207e3 100644
--- a/smoketest/scripts/cli/base_interfaces_test.py
+++ b/smoketest/scripts/cli/base_interfaces_test.py
@@ -162,6 +162,7 @@ class BasicInterfaceTest:
             distance = '100'
             hostname = 'vyos'
             vendor_class_id = 'vyos-vendor'
+            user_class = 'vyos'
 
             for interface in self._interfaces:
                 for option in self._options.get(interface, []):
@@ -172,6 +173,7 @@ class BasicInterfaceTest:
                 self.cli_set(self._base_path + [interface, 'dhcp-options', 'default-route-distance', distance])
                 self.cli_set(self._base_path + [interface, 'dhcp-options', 'host-name', hostname])
                 self.cli_set(self._base_path + [interface, 'dhcp-options', 'vendor-class-id', vendor_class_id])
+                self.cli_set(self._base_path + [interface, 'dhcp-options', 'user-class', user_class])
 
             self.cli_commit()
 
@@ -186,6 +188,7 @@ class BasicInterfaceTest:
                 self.assertIn(f'send host-name "{hostname}";', dhclient_config)
                 self.assertIn(f'send dhcp-client-identifier "{client_id}";', dhclient_config)
                 self.assertIn(f'send vendor-class-identifier "{vendor_class_id}";', dhclient_config)
+                self.assertIn(f'send user-class "{user_class}";', dhclient_config)
 
                 # and the commandline has the appropriate options
                 cmdline = read_file(f'/proc/{dhclient_pid}/cmdline')