| /* Enter a network namespace. |
| Copyright (C) 2016-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <support/namespace.h> |
| |
| #include <net/if.h> |
| #include <sched.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <support/check.h> |
| #include <support/xsocket.h> |
| #include <support/xunistd.h> |
| #include <sys/ioctl.h> |
| #include <unistd.h> |
| |
| static bool in_uts_namespace; |
| |
| bool |
| support_enter_network_namespace (void) |
| { |
| #ifdef CLONE_NEWUTS |
| if (unshare (CLONE_NEWUTS) == 0) |
| in_uts_namespace = true; |
| else |
| printf ("warning: unshare (CLONE_NEWUTS) failed: %m\n"); |
| #endif |
| |
| #ifdef CLONE_NEWNET |
| if (unshare (CLONE_NEWNET) == 0) |
| { |
| /* Bring up the loopback interface. */ |
| int fd = xsocket (AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0); |
| struct ifreq req; |
| strcpy (req.ifr_name, "lo"); |
| TEST_VERIFY_EXIT (ioctl (fd, SIOCGIFFLAGS, &req) == 0); |
| bool already_up = req.ifr_flags & IFF_UP; |
| if (already_up) |
| /* This means that we likely have not achieved isolation from |
| the parent namespace. */ |
| printf ("warning: loopback interface already exists" |
| " in new network namespace\n"); |
| else |
| { |
| req.ifr_flags |= IFF_UP | IFF_RUNNING; |
| TEST_VERIFY_EXIT (ioctl (fd, SIOCSIFFLAGS, &req) == 0); |
| } |
| xclose (fd); |
| |
| return !already_up; |
| } |
| #endif |
| printf ("warning: could not enter network namespace\n"); |
| return false; |
| } |
| |
| bool |
| support_in_uts_namespace (void) |
| { |
| return in_uts_namespace; |
| } |