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74 lines
2.4 KiB
Python
74 lines
2.4 KiB
Python
from enum import Enum
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import ipaddress
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from os import path
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import threading
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import subprocess
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import logging
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from pyroute2.netns.process.proxy import NSPopen
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INFO_PREFIX = '__info'
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HANDLER_SCRIPT = path.join(path.dirname(__file__), 'udhcpc_handler.py')
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class EventType(Enum):
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BOUND = 'bound'
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RENEW = 'renew'
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logger = logging.getLogger('gunicorn.error')
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class DHCPClientError(Exception):
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pass
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def _nspopen_wrapper(netns):
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return lambda *args, **kwargs: NSPopen(netns, *args, **kwargs)
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class DHCPClient:
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def __init__(self, iface, netns=None, once=False, event_listener=lambda t, ip, gw, dom: None):
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self.netns = netns
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self.iface = iface
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self.once = once
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self.event_listener = event_listener
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Popen = _nspopen_wrapper(netns) if netns else subprocess.Popen
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cmdline = ['/sbin/udhcpc', '-s', HANDLER_SCRIPT, '-i', iface, '-f']
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cmdline.append('-q' if once else '-R')
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self.proc = Popen(cmdline, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, encoding='utf-8')
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self.ip = None
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self.gateway = None
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self.domain = None
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self._event_thread = threading.Thread(target=self._read_events)
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self._event_thread.start()
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def _read_events(self):
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while True:
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line = self.proc.stdout.readline()
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if not line:
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break
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if not line.startswith(INFO_PREFIX):
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logger.debug('[udhcpc] %s', line)
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continue
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args = line.split(' ')[1:]
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try:
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event_type = EventType(args[0])
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except ValueError:
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logger.warning('udhcpc unknown event "%s"', ' '.join(args))
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continue
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self.ip = ipaddress.ip_interface(args[1])
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self.gateway = ipaddress.ip_address(args[2])
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self.domain = args[3]
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logger.debug('[udhcp event] %s %s %s %s', event_type, self.ip, self.gateway, self.domain)
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self.event_listener(event_type, self.ip, self.gateway, self.domain)
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def finish(self):
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if not self.once:
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self.proc.terminate()
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if self.proc.wait(timeout=10) != 0:
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raise DHCPClientError(f'udhcpc exited with non-zero exit code {self.proc.returncode}')
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self._event_thread.join()
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if self.once and not self.ip:
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raise DHCPClientError(f'failed to obtain lease')
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