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test: add DHCPv4 client hostname resend regression test
Signed-off-by: Ejub Sabic <ejub1946@outlook.com>
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‎test/case/dhcp/Readme.adoc‎

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@@ -7,6 +7,7 @@ Tests verifying DHCPv4/DHCPv6 client and server functionality:
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- DHCPv4 client with default gateway assignment
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- DHCPv4 client with static route configuration
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- DHCPv4 client hostname management and priority
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- DHCPv4 client hostname option is resent after system hostname changes
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- Basic DHCPv6 client operation with address assignment
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- DHCPv6 client with prefix delegation (IA_PD)
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- DHCPv6 SLAAC/RA (Stateless)
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<<<
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include::client_hostname_resend/Readme.adoc[]
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<<<
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include::client6_basic/Readme.adoc[]
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‎test/case/dhcp/client_hostname_resend/Readme.adoc‎

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test.adoc

‎test/case/dhcp/client_hostname_resend/test.adoc‎

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=== DHCP Hostname Resend
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ifdef::topdoc[:imagesdir: {topdoc}../../test/case/dhcp/client_hostname_resend]
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==== Description
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Verify that updating the system hostname regenerates the DHCP client
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Finit service file so subsequent DHCP requests advertise the current
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hostname (option 12, RFC 2132).
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Regression test for a bug where the DHCP client callback only reacts
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on diffs in infix-dhcp-client, so a standalone change of
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ietf-system:system/hostname leaves the previously written
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/etc/finit.d/available/dhcp-client-<iface>.conf untouched and the
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running udhcpc keeps announcing the old name.
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==== Topology
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image::topology.svg[DHCP Hostname Resend topology, align=center, scaledwidth=75%]
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==== Sequence
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. Set up topology and attach to target DUT
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. Configure initial hostname '{HOSTNM_A}'
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. Enable DHCP client sending hostname option
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. Verify Finit service carries hostname '{HOSTNM_A}'
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. Update system hostname to '{HOSTNM_B}'
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. Verify Finit service is regenerated with '{HOSTNM_B}'
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‎test/case/dhcp/client_hostname_resend/test.py‎

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#!/usr/bin/env python3
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"""DHCP Hostname Resend
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Verify that updating the system hostname regenerates the DHCP client
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Finit service file so subsequent DHCP requests advertise the current
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hostname (option 12, RFC 2132).
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Regression test for a bug where the DHCP client callback only reacts
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on diffs in infix-dhcp-client, so a standalone change of
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ietf-system:system/hostname leaves the previously written
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/etc/finit.d/available/dhcp-client-<iface>.conf untouched and the
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running udhcpc keeps announcing the old name.
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"""
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import infamy
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from infamy.util import until
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def finit_conf(ssh, ifname):
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"""Return the contents of the generated DHCP client Finit service file."""
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path = f"/etc/finit.d/available/dhcp-client-{ifname}.conf"
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cmd = ssh.runsh(f"cat {path} 2>/dev/null")
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return cmd.stdout
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def udhcpc_cmdline(ssh, ifname):
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"""Return the NUL-separated argv of the running udhcpc for ifname."""
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pidfile = f"/run/dhcp-client-{ifname}.pid"
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cmd = ssh.runsh(
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f"p=$(cat {pidfile} 2>/dev/null); "
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f"[ -n \"$p\" ] && tr '\\0' ' ' < /proc/$p/cmdline"
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)
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return cmd.stdout
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def running_hostname(ssh, ifname):
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"""Extract the hostname udhcpc is currently announcing (-x hostname:<name>)."""
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for tok in udhcpc_cmdline(ssh, ifname).split():
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if tok.startswith("hostname:"):
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return tok.split(":", 1)[1]
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return None
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with infamy.Test() as test:
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HOSTNM_A = "infix-resend-a"
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HOSTNM_B = "infix-resend-b"
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with test.step("Set up topology and attach to target DUT"):
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env = infamy.Env()
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client = env.attach("client", "mgmt")
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clissh = env.attach("client", "mgmt", "ssh")
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_, port = env.ltop.xlate("client", "mgmt")
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with test.step(f"Configure initial hostname '{HOSTNM_A}'"):
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client.put_config_dict("ietf-system", {
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"system": {
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"hostname": HOSTNM_A
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}
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})
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until(lambda: client.get_data("/ietf-system:system")
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.get("system", {}).get("hostname") == HOSTNM_A)
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with test.step("Enable DHCP client sending hostname option"):
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client.put_config_dict("ietf-interfaces", {
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"interfaces": {
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"interface": [{
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"name": port,
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"ipv4": {
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"infix-dhcp-client:dhcp": {
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"option": [
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{"id": "vendor-class", "value": "infamy"},
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{"id": "hostname", "value": "auto"},
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{"id": "netmask"},
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{"id": "router"}
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]
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}
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}
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}]
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}
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})
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with test.step(f"Verify running udhcpc announces hostname '{HOSTNM_A}'"):
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until(lambda: running_hostname(clissh, port) == HOSTNM_A)
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with test.step(f"Update system hostname to '{HOSTNM_B}'"):
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client.put_config_dict("ietf-system", {
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"system": {
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"hostname": HOSTNM_B
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}
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})
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until(lambda: client.get_data("/ietf-system:system")
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.get("system", {}).get("hostname") == HOSTNM_B)
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with test.step(f"Verify running udhcpc announces hostname '{HOSTNM_B}'"):
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try:
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until(lambda: running_hostname(clissh, port) == HOSTNM_B,
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attempts=15)
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except Exception:
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cur = running_hostname(clissh, port)
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print(f"udhcpc still announcing hostname '{cur}', expected '{HOSTNM_B}'")
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test.fail()
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test.succeed()

‎test/case/dhcp/client_hostname_resend/topology.dot‎

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graph "1x1" {
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layout="neato";
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overlap="false";
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esep="+100";
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node [shape=record, fontname="DejaVu Sans Mono, Book"];
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edge [color="cornflowerblue", penwidth="2", fontname="DejaVu Serif, Book"];
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host [
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label="host | { <mgmt> mgmt }",
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pos="0,20!",
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requires="controller",
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];
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client [
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label="{ <mgmt> mgmt } | client",
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pos="200,20!",
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requires="infix",
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];
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host:mgmt -- client:mgmt [requires="mgmt", color=lightgrey]
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}

‎test/case/dhcp/client_hostname_resend/topology.svg‎

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‎test/case/dhcp/dhcp_client.yaml‎

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- name: DHCP Hostname Priority
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case: client_hostname/test.py
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- name: DHCP Hostname Resend
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case: client_hostname_resend/test.py
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- name: DHCPv6 Basic
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case: client6_basic/test.py
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