diff options
Diffstat (limited to 'node-admin/scripts/pyroute2/netns/__init__.py')
-rw-r--r-- | node-admin/scripts/pyroute2/netns/__init__.py | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/node-admin/scripts/pyroute2/netns/__init__.py b/node-admin/scripts/pyroute2/netns/__init__.py deleted file mode 100644 index 696ff3a14a6..00000000000 --- a/node-admin/scripts/pyroute2/netns/__init__.py +++ /dev/null @@ -1,123 +0,0 @@ -# By Peter V. Saveliev https://pypi.python.org/pypi/pyroute2. Dual licensed under the Apache 2 and GPLv2+ see https://github.com/svinota/pyroute2 for License details. -''' -Network namespaces management -============================= - -Pyroute2 provides basic namespaces management support. The -`netns` module contains several tools for that. - -Please be aware, that in order to run system calls the -library uses `ctypes` module. It can fail on platforms -where SELinux is enforced. If the Python interpreter, -loading this module, dumps the core, one can check the -SELinux state with `getenforce` command. - -''' - -import os -import errno -import ctypes -import sys - -if sys.maxsize > 2**32: - __NR_setns = 308 -else: - __NR_setns = 346 - -CLONE_NEWNET = 0x40000000 -MNT_DETACH = 0x00000002 -MS_BIND = 4096 -MS_REC = 16384 -MS_SHARED = 1 << 20 -NETNS_RUN_DIR = '/var/run/netns' - - -def listnetns(): - ''' - List available network namespaces. - ''' - try: - return os.listdir(NETNS_RUN_DIR) - except OSError as e: - if e.errno == errno.ENOENT: - return [] - else: - raise - - -def create(netns, libc=None): - ''' - Create a network namespace. - ''' - libc = libc or ctypes.CDLL('libc.so.6', use_errno=True) - # FIXME validate and prepare NETNS_RUN_DIR - - netnspath = '%s/%s' % (NETNS_RUN_DIR, netns) - netnspath = netnspath.encode('ascii') - netnsdir = NETNS_RUN_DIR.encode('ascii') - - # init netnsdir - try: - os.mkdir(netnsdir) - except OSError as e: - if e.errno != errno.EEXIST: - raise - - # this code is ported from iproute2 - done = False - while libc.mount(b'', netnsdir, b'none', MS_SHARED | MS_REC, None) != 0: - if done: - raise OSError(ctypes.get_errno(), 'share rundir failed', netns) - if libc.mount(netnsdir, netnsdir, b'none', MS_BIND, None) != 0: - raise OSError(ctypes.get_errno(), 'mount rundir failed', netns) - done = True - - # create mountpoint - os.close(os.open(netnspath, os.O_RDONLY | os.O_CREAT | os.O_EXCL, 0)) - - # unshare - if libc.unshare(CLONE_NEWNET) < 0: - raise OSError(ctypes.get_errno(), 'unshare failed', netns) - - # bind the namespace - if libc.mount(b'/proc/self/ns/net', netnspath, b'none', MS_BIND, None) < 0: - raise OSError(ctypes.get_errno(), 'mount failed', netns) - - -def remove(netns, libc=None): - ''' - Remove a network namespace. - ''' - libc = libc or ctypes.CDLL('libc.so.6', use_errno=True) - netnspath = '%s/%s' % (NETNS_RUN_DIR, netns) - netnspath = netnspath.encode('ascii') - libc.umount2(netnspath, MNT_DETACH) - os.unlink(netnspath) - - -def setns(netns, flags=os.O_CREAT, libc=None): - ''' - Set netns for the current process. - - The flags semantics is the same as for the `open(2)` - call: - - - O_CREAT -- create netns, if doesn't exist - - O_CREAT | O_EXCL -- create only if doesn't exist - ''' - libc = libc or ctypes.CDLL('libc.so.6', use_errno=True) - netnspath = '%s/%s' % (NETNS_RUN_DIR, netns) - netnspath = netnspath.encode('ascii') - - if netns in listnetns(): - if flags & (os.O_CREAT | os.O_EXCL) == (os.O_CREAT | os.O_EXCL): - raise OSError(errno.EEXIST, 'netns exists', netns) - else: - if flags & os.O_CREAT: - create(netns, libc=libc) - - nsfd = os.open(netnspath, os.O_RDONLY) - ret = libc.syscall(__NR_setns, nsfd, CLONE_NEWNET) - if ret != 0: - raise OSError(ctypes.get_errno(), 'failed to open netns', netns) - return nsfd |