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https://github.com/uselessd/alcove.git
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101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
/* Copyright (c) 2014, Michael Santos <michael.santos@gmail.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifdef __linux__
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#define _GNU_SOURCE
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#include <sched.h>
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#ifndef HAVE_SETNS
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#include <syscall.h>
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#endif
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#endif
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#include "alcove.h"
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#include "alcove_call.h"
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#include "alcove_fork.h"
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#include "alcove_clone_constants.h"
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#ifdef __linux__
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#ifndef HAVE_SETNS
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static int setns(int fd, int nstype);
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#endif
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#endif
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/*
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* setns(2)
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*
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*/
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#ifdef __linux__
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#ifndef HAVE_SETNS
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static int
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setns(int fd, int nstype)
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{
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#ifdef __NR_setns
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return syscall(__NR_setns, fd, nstype);
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#else
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errno = ENOSYS;
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return -1;
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#endif
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}
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#endif
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#endif
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ssize_t
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alcove_sys_setns(alcove_state_t *ap, const char *arg, size_t len,
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char *reply, size_t rlen)
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{
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#ifdef __linux__
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int index = 0;
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char path[PATH_MAX] = {0};
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size_t plen = sizeof(path)-1;
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int fd = -1;
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int nstype = 0;
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int rv = 0;
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int errnum = 0;
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/* path */
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if (alcove_decode_iolist(arg, len, &index, path, &plen) < 0 ||
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plen == 0)
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return -1;
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/* nstype */
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switch (alcove_decode_define(arg, len, &index, &nstype,
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alcove_clone_constants)) {
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case 0:
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break;
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case 1:
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return alcove_mk_error(reply, rlen, "unsupported");
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default:
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return -1;
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}
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return alcove_mk_errno(reply, rlen, errno);
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rv = setns(fd, nstype);
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errnum = errno;
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(void)close(fd);
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if (rv < 0)
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return alcove_mk_errno(reply, rlen, errnum);
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return alcove_mk_atom(reply, rlen, "ok");
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#else
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return alcove_mk_atom(reply, rlen, "undef");
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#endif
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}
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