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76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/* Enter a network namespace.
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Copyright (C) 2016-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/namespace.h>
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#include <net/if.h>
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#include <sched.h>
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#include <stdio.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/xsocket.h>
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#include <support/xunistd.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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static bool in_uts_namespace;
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bool
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support_enter_network_namespace (void)
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{
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#ifdef CLONE_NEWUTS
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if (unshare (CLONE_NEWUTS) == 0)
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in_uts_namespace = true;
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else
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printf ("warning: unshare (CLONE_NEWUTS) failed: %m\n");
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#endif
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#ifdef CLONE_NEWNET
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if (unshare (CLONE_NEWNET) == 0)
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{
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/* Bring up the loopback interface. */
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int fd = xsocket (AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
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struct ifreq req;
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strcpy (req.ifr_name, "lo");
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TEST_VERIFY_EXIT (ioctl (fd, SIOCGIFFLAGS, &req) == 0);
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bool already_up = req.ifr_flags & IFF_UP;
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if (already_up)
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/* This means that we likely have not achieved isolation from
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the parent namespace. */
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printf ("warning: loopback interface already exists"
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" in new network namespace\n");
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else
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{
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req.ifr_flags |= IFF_UP | IFF_RUNNING;
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TEST_VERIFY_EXIT (ioctl (fd, SIOCSIFFLAGS, &req) == 0);
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}
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xclose (fd);
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return !already_up;
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}
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#endif
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printf ("warning: could not enter network namespace\n");
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return false;
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}
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bool
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support_in_uts_namespace (void)
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{
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return in_uts_namespace;
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}
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