Make DHCP discovery aware of the network integration (#144767)

Co-authored-by: J. Nick Koston <nick@koston.org>

homeassistant/components/dhcp/__init__.py

@@ -7,6 +7,7 @@ from collections.abc import Callable
 from datetime import timedelta
 from fnmatch import translate
 from functools import lru_cache, partial
+from ipaddress import IPv4Address
 import itertools
 import logging
 import re
@@ -22,6 +23,7 @@ from aiodiscover.discovery import (
 from cached_ipaddress import cached_ip_addresses
 
 from homeassistant import config_entries
+from homeassistant.components import network
 from homeassistant.components.device_tracker import (
     ATTR_HOST_NAME,
     ATTR_IP,
@@ -421,9 +423,33 @@ class DHCPWatcher(WatcherBase):
             response.ip_address, response.hostname, response.mac_address
         )
 
+    async def async_get_adapter_indexes(self) -> list[int] | None:
+        """Get the adapter indexes."""
+        adapters = await network.async_get_adapters(self.hass)
+        if network.async_only_default_interface_enabled(adapters):
+            return None
+        return [
+            adapter["index"]
+            for adapter in adapters
+            if (
+                adapter["enabled"]
+                and adapter["index"] is not None
+                and adapter["ipv4"]
+                and (
+                    addresses := [IPv4Address(ip["address"]) for ip in adapter["ipv4"]]
+                )
+                and any(
+                    ip for ip in addresses if not ip.is_loopback and not ip.is_global
+                )
+            )
+        ]
+
     async def async_start(self) -> None:
         """Start watching for dhcp packets."""
-        self._unsub = await aiodhcpwatcher.async_start(self._async_process_dhcp_request)
+        self._unsub = await aiodhcpwatcher.async_start(
+            self._async_process_dhcp_request,
+            await self.async_get_adapter_indexes(),
+        )
 
 
 class RediscoveryWatcher(WatcherBase):

homeassistant/components/dhcp/manifest.json

@@ -2,6 +2,7 @@
   "domain": "dhcp",
   "name": "DHCP Discovery",
   "codeowners": ["@bdraco"],
+  "dependencies": ["network"],
   "documentation": "https://www.home-assistant.io/integrations/dhcp",
   "integration_type": "system",
   "iot_class": "local_push",

tests/components/dhcp/test_init.py

@@ -157,6 +157,7 @@ async def _async_get_handle_dhcp_packet(
         hass,
         DHCPData(integration_matchers, set(), address_data),
     )
+
     with patch("aiodhcpwatcher.async_start"):
         await dhcp_watcher.async_start()
 
@@ -171,6 +172,53 @@ async def _async_get_handle_dhcp_packet(
     return cast("Callable[[Any], Awaitable[None]]", _async_handle_dhcp_packet)
 
 
+async def test_dhcp_start_using_multiple_interfaces(
+    hass: HomeAssistant,
+) -> None:
+    """Test start using multiple interfaces."""
+
+    def _generate_mock_adapters():
+        return [
+            {
+                "index": 1,
+                "auto": False,
+                "default": False,
+                "enabled": True,
+                "ipv4": [{"address": "192.168.0.1", "network_prefix": 24}],
+                "ipv6": [],
+                "name": "eth0",
+            },
+            {
+                "index": 2,
+                "auto": True,
+                "default": True,
+                "enabled": True,
+                "ipv4": [{"address": "192.168.1.1", "network_prefix": 24}],
+                "ipv6": [],
+                "name": "eth1",
+            },
+        ]
+
+    integration_matchers = dhcp.async_index_integration_matchers(
+        [{"domain": "mock-domain", "hostname": "connect", "macaddress": "B8B7F1*"}]
+    )
+    dhcp_watcher = dhcp.DHCPWatcher(
+        hass,
+        DHCPData(integration_matchers, set(), {}),
+    )
+
+    with (
+        patch("aiodhcpwatcher.async_start") as mock_start,
+        patch(
+            "homeassistant.components.dhcp.network.async_get_adapters",
+            return_value=_generate_mock_adapters(),
+        ),
+    ):
+        await dhcp_watcher.async_start()
+
+    mock_start.assert_called_with(dhcp_watcher._async_process_dhcp_request, [1, 2])
+
+
 async def test_dhcp_match_hostname_and_macaddress(hass: HomeAssistant) -> None:
     """Test matching based on hostname and macaddress."""
     integration_matchers = dhcp.async_index_integration_matchers(

tests/components/dhcp/test_websocket_api.py

@@ -22,6 +22,7 @@ async def test_subscribe_discovery(
 
     async def mock_start(
         callback: Callable[[aiodhcpwatcher.DHCPRequest], None],
+        if_indexes: list[int] | None = None,
     ) -> None:
         """Mock start."""
         nonlocal saved_callback

tests/test_requirements.py

@@ -655,5 +655,5 @@ async def test_discovery_requirements_dhcp(hass: HomeAssistant) -> None:
     ) as mock_process:
         await async_get_integration_with_requirements(hass, "comp")
 
-    assert len(mock_process.mock_calls) == 1  # dhcp does not depend on http
+    assert len(mock_process.mock_calls) == 2  # dhcp does not depend on http
     assert mock_process.mock_calls[0][1][1] == dhcp.requirements