248 lines
7.6 KiB
Python
248 lines
7.6 KiB
Python
"""Support for OpenWRT (ubus) routers."""
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import json
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import logging
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import re
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import requests
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import voluptuous as vol
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from homeassistant.components.device_tracker import (
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DOMAIN,
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PLATFORM_SCHEMA,
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DeviceScanner,
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)
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from homeassistant.const import CONF_HOST, CONF_PASSWORD, CONF_USERNAME
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from homeassistant.exceptions import HomeAssistantError
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import homeassistant.helpers.config_validation as cv
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_LOGGER = logging.getLogger(__name__)
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CONF_DHCP_SOFTWARE = "dhcp_software"
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DEFAULT_DHCP_SOFTWARE = "dnsmasq"
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DHCP_SOFTWARES = ["dnsmasq", "odhcpd", "none"]
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
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{
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vol.Required(CONF_HOST): cv.string,
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vol.Required(CONF_PASSWORD): cv.string,
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vol.Required(CONF_USERNAME): cv.string,
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vol.Optional(CONF_DHCP_SOFTWARE, default=DEFAULT_DHCP_SOFTWARE): vol.In(
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DHCP_SOFTWARES
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),
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}
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)
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def get_scanner(hass, config):
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"""Validate the configuration and return an ubus scanner."""
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dhcp_sw = config[DOMAIN][CONF_DHCP_SOFTWARE]
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if dhcp_sw == "dnsmasq":
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scanner = DnsmasqUbusDeviceScanner(config[DOMAIN])
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elif dhcp_sw == "odhcpd":
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scanner = OdhcpdUbusDeviceScanner(config[DOMAIN])
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else:
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scanner = UbusDeviceScanner(config[DOMAIN])
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return scanner if scanner.success_init else None
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def _refresh_on_access_denied(func):
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"""If remove rebooted, it lost our session so rebuild one and try again."""
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def decorator(self, *args, **kwargs):
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"""Wrap the function to refresh session_id on PermissionError."""
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try:
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return func(self, *args, **kwargs)
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except PermissionError:
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_LOGGER.warning(
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"Invalid session detected."
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" Trying to refresh session_id and re-run RPC"
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)
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self.session_id = _get_session_id(self.url, self.username, self.password)
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return func(self, *args, **kwargs)
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return decorator
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class UbusDeviceScanner(DeviceScanner):
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"""
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This class queries a wireless router running OpenWrt firmware.
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Adapted from Tomato scanner.
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"""
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def __init__(self, config):
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"""Initialize the scanner."""
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host = config[CONF_HOST]
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self.username = config[CONF_USERNAME]
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self.password = config[CONF_PASSWORD]
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self.parse_api_pattern = re.compile(r"(?P<param>\w*) = (?P<value>.*);")
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self.last_results = {}
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self.url = f"http://{host}/ubus"
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self.session_id = _get_session_id(self.url, self.username, self.password)
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self.hostapd = []
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self.mac2name = None
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self.success_init = self.session_id is not None
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def scan_devices(self):
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"""Scan for new devices and return a list with found device IDs."""
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self._update_info()
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return self.last_results
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def _generate_mac2name(self):
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"""Return empty MAC to name dict. Overridden if DHCP server is set."""
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self.mac2name = dict()
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@_refresh_on_access_denied
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def get_device_name(self, device):
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"""Return the name of the given device or None if we don't know."""
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if self.mac2name is None:
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self._generate_mac2name()
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if self.mac2name is None:
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# Generation of mac2name dictionary failed
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return None
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name = self.mac2name.get(device.upper(), None)
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return name
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@_refresh_on_access_denied
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def _update_info(self):
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"""Ensure the information from the router is up to date.
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Returns boolean if scanning successful.
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"""
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if not self.success_init:
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return False
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_LOGGER.info("Checking hostapd")
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if not self.hostapd:
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hostapd = _req_json_rpc(self.url, self.session_id, "list", "hostapd.*", "")
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self.hostapd.extend(hostapd.keys())
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self.last_results = []
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results = 0
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# for each access point
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for hostapd in self.hostapd:
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result = _req_json_rpc(
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self.url, self.session_id, "call", hostapd, "get_clients"
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)
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if result:
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results = results + 1
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# Check for each device is authorized (valid wpa key)
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for key in result["clients"].keys():
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device = result["clients"][key]
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if device["authorized"]:
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self.last_results.append(key)
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return bool(results)
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class DnsmasqUbusDeviceScanner(UbusDeviceScanner):
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"""Implement the Ubus device scanning for the dnsmasq DHCP server."""
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def __init__(self, config):
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"""Initialize the scanner."""
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super().__init__(config)
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self.leasefile = None
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def _generate_mac2name(self):
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if self.leasefile is None:
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result = _req_json_rpc(
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self.url,
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self.session_id,
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"call",
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"uci",
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"get",
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config="dhcp",
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type="dnsmasq",
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)
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if result:
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values = result["values"].values()
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self.leasefile = next(iter(values))["leasefile"]
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else:
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return
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result = _req_json_rpc(
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self.url, self.session_id, "call", "file", "read", path=self.leasefile
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)
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if result:
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self.mac2name = dict()
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for line in result["data"].splitlines():
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hosts = line.split(" ")
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self.mac2name[hosts[1].upper()] = hosts[3]
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else:
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# Error, handled in the _req_json_rpc
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return
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class OdhcpdUbusDeviceScanner(UbusDeviceScanner):
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"""Implement the Ubus device scanning for the odhcp DHCP server."""
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def _generate_mac2name(self):
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result = _req_json_rpc(self.url, self.session_id, "call", "dhcp", "ipv4leases")
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if result:
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self.mac2name = dict()
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for device in result["device"].values():
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for lease in device["leases"]:
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mac = lease["mac"] # mac = aabbccddeeff
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# Convert it to expected format with colon
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mac = ":".join(mac[i : i + 2] for i in range(0, len(mac), 2))
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self.mac2name[mac.upper()] = lease["hostname"]
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else:
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# Error, handled in the _req_json_rpc
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return
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def _req_json_rpc(url, session_id, rpcmethod, subsystem, method, **params):
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"""Perform one JSON RPC operation."""
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data = json.dumps(
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{
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"jsonrpc": "2.0",
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"id": 1,
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"method": rpcmethod,
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"params": [session_id, subsystem, method, params],
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}
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)
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try:
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res = requests.post(url, data=data, timeout=5)
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except (requests.exceptions.ConnectionError, requests.exceptions.Timeout):
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return
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if res.status_code == 200:
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response = res.json()
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if "error" in response:
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if (
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"message" in response["error"]
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and response["error"]["message"] == "Access denied"
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):
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raise PermissionError(response["error"]["message"])
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raise HomeAssistantError(response["error"]["message"])
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if rpcmethod == "call":
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try:
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return response["result"][1]
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except IndexError:
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return
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else:
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return response["result"]
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def _get_session_id(url, username, password):
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"""Get the authentication token for the given host+username+password."""
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res = _req_json_rpc(
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url,
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"00000000000000000000000000000000",
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"call",
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"session",
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"login",
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username=username,
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password=password,
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)
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return res["ubus_rpc_session"]
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