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"""
ddupdate plugin supporting getting ip address from a command.
See: ddupdate(8)
"""
import re
import subprocess
from ddupdate.ddplugin import \
AddressPlugin, AddressError, IpAddr, dict_of_opts
class IpFromCmdPlugin(AddressPlugin):
"""
Use ip4 address obtained from a command.
The command is invoked without parameters, and should return one or
two space-separated words on stdout. Each word must either a valid
ipv4 or ipv6 address. Anything which is not parsed as addresses
is treated as an error message.
Note that when invoked in a systemd context, the environment
for the command is more or less empty.
The command invoked is specified in the cmd option
Options:
cmd=command
netrc:
Nothing
"""
_name = 'ip-from-command'
_oneliner = 'Obtain address from a command'
def get_ip(self, log, options):
"""Implement AddressPlugin.get_ip()."""
opts = dict_of_opts(options)
if 'cmd' not in opts:
raise AddressError('Required option cmd= missing, giving up.')
cmd = opts['cmd']
log.debug('Running: %s', cmd)
addr = IpAddr()
result = subprocess.getoutput(cmd).strip()
log.debug('result: %s', result)
pat = re.compile(r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}')
pat6 = re.compile(r'[:0-9a-f]{12,}(\s|\Z)')
for word in result.split():
if pat.fullmatch(word):
addr.v4 = word
elif pat6.fullmatch(word):
addr.v6 = word
else:
raise AddressError(
'Cannot parse command output: ' + result)
return addr
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