1 /*-
2 * Copyright (c) 2013 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Pawel Jakub Dawidek under sponsorship from
6 * the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/nv.h>
34
35 #include <errno.h>
36 #include <string.h>
37
38 #include "libcapsicum.h"
39 #include "libcapsicum_sysctl.h"
40
41 int
cap_sysctlbyname(cap_channel_t * chan,const char * name,void * oldp,size_t * oldlenp,const void * newp,size_t newlen)42 cap_sysctlbyname(cap_channel_t *chan, const char *name, void *oldp,
43 size_t *oldlenp, const void *newp, size_t newlen)
44 {
45 nvlist_t *nvl;
46 const uint8_t *retoldp;
47 uint8_t operation;
48 size_t oldlen;
49
50 operation = 0;
51 if (oldp != NULL)
52 operation |= CAP_SYSCTL_READ;
53 if (newp != NULL)
54 operation |= CAP_SYSCTL_WRITE;
55
56 nvl = nvlist_create(0);
57 nvlist_add_string(nvl, "cmd", "sysctl");
58 nvlist_add_string(nvl, "name", name);
59 nvlist_add_number(nvl, "operation", (uint64_t)operation);
60 if (oldp == NULL && oldlenp != NULL)
61 nvlist_add_null(nvl, "justsize");
62 else if (oldlenp != NULL)
63 nvlist_add_number(nvl, "oldlen", (uint64_t)*oldlenp);
64 if (newp != NULL)
65 nvlist_add_binary(nvl, "newp", newp, newlen);
66 nvl = cap_xfer_nvlist(chan, nvl, 0);
67 if (nvl == NULL)
68 return (-1);
69 if (nvlist_get_number(nvl, "error") != 0) {
70 errno = (int)nvlist_get_number(nvl, "error");
71 nvlist_destroy(nvl);
72 return (-1);
73 }
74
75 if (oldp == NULL && oldlenp != NULL) {
76 *oldlenp = (size_t)nvlist_get_number(nvl, "oldlen");
77 } else if (oldp != NULL) {
78 retoldp = nvlist_get_binary(nvl, "oldp", &oldlen);
79 memcpy(oldp, retoldp, oldlen);
80 if (oldlenp != NULL)
81 *oldlenp = oldlen;
82 }
83 nvlist_destroy(nvl);
84
85 return (0);
86 }
87