| 1 |
douglas |
1411 |
#!/usr/bin/env python |
| 2 |
|
|
# DHCP Client Exit Hooks Installer |
| 3 |
|
|
# |
| 4 |
|
|
# Douglas Thrift |
| 5 |
|
|
# |
| 6 |
|
|
# $Id$ |
| 7 |
|
|
|
| 8 |
|
|
import optparse |
| 9 |
|
|
import os |
| 10 |
|
|
import re |
| 11 |
|
|
import sys |
| 12 |
|
|
import tempfile |
| 13 |
|
|
|
| 14 |
|
|
HOOKS = 'dhclient-exit-hooks' |
| 15 |
|
|
VARIABLES = { |
| 16 |
|
|
'tunnelbroker': { |
| 17 |
|
|
'pass': None, |
| 18 |
|
|
'user_id': None, |
| 19 |
|
|
'tunnel_id': None, |
| 20 |
|
|
}, |
| 21 |
|
|
'dns': { |
| 22 |
|
|
'key': None, |
| 23 |
|
|
'secret': None, |
| 24 |
|
|
}, |
| 25 |
|
|
} |
| 26 |
|
|
|
| 27 |
|
|
def parse(hooks, callback): |
| 28 |
|
|
functions = re.compile(r'^(%s)\(\)$' % '|'.join(VARIABLES.iterkeys())) |
| 29 |
|
|
function = None |
| 30 |
|
|
|
| 31 |
|
|
with open(hooks, 'rb') as hooks: |
| 32 |
|
|
for line in hooks: |
| 33 |
|
|
if line == '}\n': |
| 34 |
|
|
function = None |
| 35 |
|
|
else: |
| 36 |
|
|
match = functions.match(line) |
| 37 |
|
|
|
| 38 |
|
|
if match is not None: |
| 39 |
|
|
function = match.group(1) |
| 40 |
|
|
|
| 41 |
|
|
callback(line, function, VARIABLES.get(function)) |
| 42 |
|
|
|
| 43 |
|
|
if __name__ == '__main__': |
| 44 |
|
|
import readline |
| 45 |
|
|
|
| 46 |
|
|
parser = optparse.OptionParser(usage = '%prog [options] [DIRECTORY]') |
| 47 |
|
|
|
| 48 |
|
|
def variables(option, opt, value, parser, *args, **kwargs): |
| 49 |
|
|
variables = VARIABLES.get(value[0]) |
| 50 |
|
|
|
| 51 |
|
|
if variables is None: |
| 52 |
|
|
raise optparse.OptionValueError, '%s unknown function "%s"' % (opt, value[0]) |
| 53 |
|
|
|
| 54 |
|
|
if value[1] not in variables: |
| 55 |
|
|
raise optparse.OptionValueError, '%s unknown variable "%s"' % (opt, value[1]) |
| 56 |
|
|
|
| 57 |
|
|
parser.values.ensure_value(option.dest, set()).add(value) |
| 58 |
|
|
|
| 59 |
|
|
parser.add_option('-f', '--force', action = 'callback', type = 'string', dest = 'force', default = set(), nargs = 2, callback = variables, metavar = 'FUNCTION VARIABLE') |
| 60 |
|
|
|
| 61 |
|
|
options, args = parser.parse_args() |
| 62 |
|
|
|
| 63 |
|
|
if len(args) != 1: |
| 64 |
|
|
parser.error('no directory specified') |
| 65 |
|
|
|
| 66 |
|
|
os.umask(077) |
| 67 |
|
|
|
| 68 |
|
|
hooks = os.path.join(args[0], HOOKS) |
| 69 |
|
|
|
| 70 |
|
|
if os.path.exists(hooks): |
| 71 |
|
|
def read(line, function, variables): |
| 72 |
|
|
if function is not None: |
| 73 |
|
|
match = re.match(r"^\tlocal (%s)='(.*)'$" % '|'.join(variables.iterkeys()), line) |
| 74 |
|
|
|
| 75 |
|
|
if match is not None: |
| 76 |
|
|
variable, value = match.group(1, 2) |
| 77 |
|
|
|
| 78 |
|
|
if (function, variable) not in options.force: |
| 79 |
|
|
variables[variable] = value |
| 80 |
|
|
|
| 81 |
|
|
parse(hooks, read) |
| 82 |
|
|
|
| 83 |
|
|
with tempfile.NamedTemporaryFile('wb', prefix = HOOKS + '.', dir = args[0]) as temp: |
| 84 |
|
|
def write(line, function, variables): |
| 85 |
|
|
if function is not None: |
| 86 |
|
|
match = re.match(r'''^\t(?:read -p '{0} ({1}): ' -r \1|local ({1})=`python -c "(import .+); print (.*'{0} \2: '.*)"`)$'''.format(function, '|'.join(variables.iterkeys())), line) |
| 87 |
|
|
|
| 88 |
|
|
if match is not None: |
| 89 |
|
|
variable = match.group(1) |
| 90 |
|
|
|
| 91 |
|
|
if variable is None: |
| 92 |
|
|
variable, imports, python = match.group(2, 3, 4) |
| 93 |
|
|
else: |
| 94 |
|
|
imports, python = None, None |
| 95 |
|
|
|
| 96 |
|
|
value = variables[variable] |
| 97 |
|
|
|
| 98 |
|
|
if value is None: |
| 99 |
|
|
if python is not None: |
| 100 |
|
|
exec imports |
| 101 |
|
|
|
| 102 |
|
|
value = eval(python) |
| 103 |
|
|
else: |
| 104 |
|
|
value = raw_input('%s %s: ' % (function, variable)) |
| 105 |
|
|
|
| 106 |
|
|
line = "\tlocal %s='%s'\n" % (variable, value) |
| 107 |
|
|
|
| 108 |
|
|
temp.write(line) |
| 109 |
|
|
|
| 110 |
|
|
parse(HOOKS, write) |
| 111 |
|
|
|
| 112 |
|
|
temp.delete = False |
| 113 |
|
|
|
| 114 |
|
|
os.rename(temp.name, hooks) |
