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"""
ddupdate plugin to obtain ip address.
See: ddupdate(8)
"""
import subprocess
from ddupdate.ddplugin import AddressPlugin, AddressError, IpAddr
def find_device(words):
"""Return first word following 'dev' or None."""
found = False
for word in words:
if word == "dev":
found = True
elif found:
return word
return None
class DefaultIfPLugin(AddressPlugin):
"""
Locates the default interface.
Digs in the routing tables and returns it's address using linux-specific
code based on the ip utility which must be in $PATH
Options used: none
"""
_name = 'default-if'
_oneliner = 'Get ip address from default interface (linux)'
def get_ip(self, log, options):
"""
Get default interface using ip route and address using ifconfig.
"""
if_ = None
for line in subprocess.getoutput('ip route').split('\n'):
words = line.split()
if words[0] == 'default':
if_ = find_device(words)
break
if if_ is None:
raise AddressError("Cannot find default interface, giving up")
address = IpAddr()
output = subprocess.getoutput('ip address show dev ' + if_)
address.parse_ifconfig_output(output)
return address
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