[patch] 4. Enable loopback after unshare()

0004-Enable-the-loopback-interface-after-unsharing-networ.patch (text/plain), 1.37 KB, created by Michał Górny on 2013-08-17 20:17:10 UTC

From d399f691bdad19723cbfa2d5f1e5d6979ed2bc11 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20G=C3=B3rny?= <[e-mail]>
Date: Sat, 17 Aug 2013 22:05:52 +0200
Subject: [PATCH 4/4] Enable the loopback interface after unsharing network.

---
 pym/portage/process.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/pym/portage/process.py b/pym/portage/process.py
index 0cebba7..a7464c7 100644
--- a/pym/portage/process.py
+++ b/pym/portage/process.py
@@ -5,8 +5,11 @@
 
 import atexit
 import errno
+import fcntl
 import platform
 import signal
+import socket
+import struct
 import sys
 import traceback
 import os as _os
@@ -439,6 +442,19 @@ def _exec(binary, mycommand, opt_name, fd_pipes, env, gid, groups, uid, umask,
 						writemsg("Unable to unshare network: %s\n" % (
 							errno.errorcode.get(ctypes.get_errno(), '?')),
 							noiselevel=-1)
+					else:
+						# 'up' the loopback
+						IFF_UP = 0x1
+						ifreq = struct.pack('16sh', b'lo', IFF_UP)
+						SIOCSIFFLAGS = 0x8914
+
+						sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, 0)
+						try:
+							fcntl.ioctl(sock, SIOCSIFFLAGS, ifreq)
+						except IOError as e:
+							writemsg("Unable to enable loopback interface: %s\n" % (
+								errno.errorcode.get(e.errno, '?')),
+								noiselevel=-1)
 				except AttributeError:
 					# unshare() not supported by libc
 					pass
-- 
1.8.3.2