Function ipfw_rule_exists

sshuttle/methods/ipfw.py:29–44

(n)

def ipfw_rule_exists(n):
    argv = ['ipfw', 'list', '%d' % n]
    p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE, env=get_env())

    found = False
    for line in p.stdout:
        if line.startswith(b'%05d ' % n):
            if 'check-state :sshuttle' not in line:
                log('non-sshuttle ipfw rule: %r' % line.strip())
                raise Fatal('non-sshuttle ipfw rule #%d already exists!' % n)
            found = True
            break
    rv = p.wait()
    if rv:
        raise Fatal('%r returned %d' % (argv, rv))
    return found


_oldctls = {}