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import sys, os, socket, errno
logprefix = ''
verbose = 0
def log(s):
try:
sys.stdout.flush()
sys.stderr.write(logprefix + s)
sys.stderr.flush()
except IOError:
# this could happen if stderr gets forcibly disconnected, eg. because
# our tty closes. That sucks, but it's no reason to abort the program.
pass
def debug1(s):
if verbose >= 1:
log(s)
def debug2(s):
if verbose >= 2:
log(s)
def debug3(s):
if verbose >= 3:
log(s)
class Fatal(Exception):
pass
EXITCODE_NEEDS_REBOOT = 111
class FatalNeedsReboot(Fatal):
pass
def list_contains_any(l, sub):
for i in sub:
if i in l:
return True
return False
def resolvconf_nameservers():
l = []
for line in open('/etc/resolv.conf'):
words = line.lower().split()
if len(words) >= 2 and words[0] == 'nameserver':
l.append(words[1])
return l
def resolvconf_random_nameserver():
l = resolvconf_nameservers()
if l:
if len(l) > 1:
# don't import this unless we really need it
import random
random.shuffle(l)
return l[0]
else:
return '127.0.0.1'
def islocal(ip):
sock = socket.socket()
try:
try:
sock.bind((ip, 0))
except socket.error, e:
if e.args[0] == errno.EADDRNOTAVAIL:
return False # not a local IP
else:
raise
finally:
sock.close()
return True # it's a local IP, or there would have been an error
def shl(n, bits):
# we use our own implementation of left-shift because
# results may be different between older and newer versions
# of python for numbers like 1<<32. We use long() because
# int(2**32) doesn't work in older python, which has limited
# int sizes.
return n * long(2**bits)
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