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bitbake: utils: Add enable_loopback_networking()

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It can be used to enable the loopback interface, typically after calling
disable_network().

Also correct a typo in a debug message.

(Bitbake rev: 0d317209d4234c5f05a9fcdc13c52f502f104018)

Signed-off-by: Mattias Jernberg <mattias.jernberg@axis.com>
Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Mattias Jernberg
2022-09-29 18:37:13 +02:00
committed by Richard Purdie
parent 764bbf2a9b
commit 74877d2dc2
1 changed files with 41 additions and 1 deletions
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42
bitbake/lib/bb/utils.py
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@@ -29,6 +29,8 @@ import collections
import copy
import ctypes
import random
import socket
import struct
import tempfile
from subprocess import getstatusoutput
from contextlib import contextmanager
@@ -1603,6 +1605,44 @@ def set_process_name(name):
except:
pass
def enable_loopback_networking():
# From bits/ioctls.h
SIOCGIFFLAGS = 0x8913
SIOCSIFFLAGS = 0x8914
SIOCSIFADDR = 0x8916
SIOCSIFNETMASK = 0x891C
# if.h
IFF_UP = 0x1
IFF_RUNNING = 0x40
# bits/socket.h
AF_INET = 2
# char ifr_name[IFNAMSIZ=16]
ifr_name = struct.pack("@16s", b"lo")
def netdev_req(fd, req, data = b""):
# Pad and add interface name
data = ifr_name + data + (b'\x00' * (16 - len(data)))
# Return all data after interface name
return fcntl.ioctl(fd, req, data)[16:]
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_IP) as sock:
fd = sock.fileno()
# struct sockaddr_in ifr_addr { unsigned short family; uint16_t sin_port ; uint32_t in_addr; }
req = struct.pack("@H", AF_INET) + struct.pack("=H4B", 0, 127, 0, 0, 1)
netdev_req(fd, SIOCSIFADDR, req)
# short ifr_flags
flags = struct.unpack_from('@h', netdev_req(fd, SIOCGIFFLAGS))[0]
flags |= IFF_UP | IFF_RUNNING
netdev_req(fd, SIOCSIFFLAGS, struct.pack('@h', flags))
# struct sockaddr_in ifr_netmask
req = struct.pack("@H", AF_INET) + struct.pack("=H4B", 0, 255, 0, 0, 0)
netdev_req(fd, SIOCSIFNETMASK, req)
def disable_network(uid=None, gid=None):
"""
Disable networking in the current process if the kernel supports it, else
@@ -1624,7 +1664,7 @@ def disable_network(uid=None, gid=None):
ret = libc.unshare(CLONE_NEWNET | CLONE_NEWUSER)
if ret != 0:
logger.debug("System doesn't suport disabling network without admin privs")
logger.debug("System doesn't support disabling network without admin privs")
return
with open("/proc/self/uid_map", "w") as f:
f.write("%s %s 1" % (uid, uid))