def add_route_table(table_name):
"""
Adds a new routing table by name
Add a new entry in /etc/iproute2/rt_tables
Parameters
----------
table_name : str
name of the new table
Returns
-------
bool
True for success, False for failure
"""
# first , find a free number for the table
tables_num = []
_all_new_lines = []
with open('/etc/iproute2/rt_tables') as f:
for line in f.readlines():
_all_new_lines.append(line)
if len(line.strip()) > 0 and not line.startswith('#'):
# trust the format of that file
tables_num.append(int(line.split()[0]))
_new_table_num_to_use = -1
for n in xrange(255):
if n not in tables_num:
_new_table_num_to_use = n
break
_logger.debug('new table index : %d' % _new_table_num_to_use)
_all_new_lines.append('%d\t%s\n' % (_new_table_num_to_use, table_name))
if sudo_utils.copy_file('/etc/iproute2/rt_tables',
'/etc/iproute2/rt_tables.bck') != 0:
_logger.debug(
'cannot backup file [%s] to %s' %
('/etc/iproute2/rt_tables', '/etc/iproute2/rt_tables.bck'))
return False
if sudo_utils.write_to_file('/etc/iproute2/rt_tables',
''.join(_all_new_lines)) != 0:
_logger.debug('cannot write new content to file [%s]'
'/etc/iproute2/rt_tables')
sudo_utils.copy_file('/etc/iproute2/rt_tables.bck',
'/etc/iproute2/rt_tables')
return False
else:
sudo_utils.delete_file('/etc/iproute2/rt_tables.bck')
return True
def delete_route_table(table_name):
"""
Deletes a routing table by name
remove a entry in /etc/iproute2/rt_tables
Parameters
----------
table_name : str
name of the new table
Returns
-------
bool
True for success, False for failure
"""
_all_new_lines = []
with open('/etc/iproute2/rt_tables') as f:
_all_lines = f.readlines()
for line in _all_lines:
# format is '<index>\t<table name>'
_s_l = line.split()
if len(_s_l) > 1 and _s_l[1] == table_name:
# foudn the table name , skip this line
continue
_all_new_lines.append(line)
if sudo_utils.copy_file('/etc/iproute2/rt_tables',
'/etc/iproute2/rt_tables.bck') != 0:
_logger.debug(
'cannot backup file [%s] to %s' %
('/etc/iproute2/rt_tables', '/etc/iproute2/rt_tables.bck'))
return False
if sudo_utils.write_to_file('/etc/iproute2/rt_tables',
''.join(_all_new_lines)) != 0:
_logger.debug('cannot write new content to file [%s]'
'/etc/iproute2/rt_tables')
sudo_utils.copy_file('/etc/iproute2/rt_tables.bck',
'/etc/iproute2/rt_tables')
return False
else:
sudo_utils.delete_file('/etc/iproute2/rt_tables.bck')
return True
def remove(self):
_logger.debug('removing file %s' % self.path)
return sudo_utils.delete_file(self.path)
def remove(self):
if sudo_utils.call([SYSTEMCTL_CMD, 'disable', '--now', self.name]):
raise StandardError('stop of systend unit has failed')
sudo_utils.delete_file('/etc/systemd/system/%s.service' % self.name)