112 lines
4.0 KiB
Python
112 lines
4.0 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright (c) 2022, The OpenThread Authors.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. Neither the name of the copyright holder nor the
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# names of its contributors may be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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import ipaddress
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import sys
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import time
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from zeroconf import IPVersion, ServiceBrowser, ServiceStateChange, Zeroconf, DNSAddress, DNSService, DNSText
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def on_service_state_change(zeroconf, service_type, name, state_change):
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if state_change is ServiceStateChange.Added:
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zeroconf.get_service_info(service_type, name)
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class BorderAgent(object):
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alias = None
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server_name = None
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addr = None
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port = None
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thread_status = None
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def __init__(self, alias):
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self.alias = alias
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def __repr__(self):
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return str([self.alias, self.addr, self.port, self.thread_status])
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def get_ipaddr_priority(addr: ipaddress.IPv6Address):
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# calculate the priority of IPv6 addresses in order: Global > non Global > Link local
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if addr.is_link_local:
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return 0
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if not addr.is_global:
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return 1
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return 2
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def parse_cache(cache):
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border_agents = []
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# Find all border routers
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for ptr in cache.get('_meshcop._udp.local.', []):
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border_agents.append(BorderAgent(ptr.alias))
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# Find server name, port and Thread Interface status for each border router
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for ba in border_agents:
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for record in cache.get(ba.alias.lower(), []):
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if isinstance(record, DNSService):
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ba.server_name = record.server
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ba.port = record.port
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elif isinstance(record, DNSText):
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text = bytearray(record.text)
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sb = text.split(b'sb=')[1][0:4]
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ba.thread_status = (sb[3] & 0x18) >> 3
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# Find IPv6 address for each border router
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for ba in border_agents:
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for record in cache.get(ba.server_name.lower(), []):
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if isinstance(record, DNSAddress):
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addr = ipaddress.ip_address(record.address)
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if not isinstance(addr, ipaddress.IPv6Address) or addr.is_multicast or addr.is_loopback:
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continue
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if not ba.addr or get_ipaddr_priority(addr) > get_ipaddr_priority(ipaddress.IPv6Address(ba.addr)):
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ba.addr = str(addr)
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return border_agents
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def main():
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# Browse border agents
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zeroconf = Zeroconf(ip_version=IPVersion.V6Only)
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ServiceBrowser(zeroconf, "_meshcop._udp.local.", handlers=[on_service_state_change])
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time.sleep(2)
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cache = zeroconf.cache.cache
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zeroconf.close()
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border_agents = parse_cache(cache)
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for ba in border_agents:
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print(ba)
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if __name__ == '__main__':
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main()
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