1/*	$NetBSD: accessors.c,v 1.3 2016/01/26 23:12:17 pooka Exp $	*/
2
3/*
4 * Copyright (c) 2007-2011 Antti Kantee.  All Rights Reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28/*
29 * This file contains various data structure accessor routines.
30 * They are meant to help clients that make calls into the depths
31 * of the kernel (e.g. at vfs layer) bypassing the syscall layer.
32 */
33
34#include <sys/cdefs.h>
35__KERNEL_RCSID(0, "$NetBSD: accessors.c,v 1.3 2016/01/26 23:12:17 pooka Exp $");
36
37#include <sys/param.h>
38#include <sys/kauth.h>
39#include <sys/kmem.h>
40#include <sys/uio.h>
41
42#include <rump-sys/kern.h>
43
44struct uio *
45rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
46{
47	struct uio *uio;
48	enum uio_rw uiorw;
49
50	switch (rw) {
51	case RUMPUIO_READ:
52		uiorw = UIO_READ;
53		break;
54	case RUMPUIO_WRITE:
55		uiorw = UIO_WRITE;
56		break;
57	default:
58		panic("%s: invalid rw %d", __func__, rw);
59	}
60
61	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
62	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
63
64	uio->uio_iov->iov_base = buf;
65	uio->uio_iov->iov_len = bufsize;
66
67	uio->uio_iovcnt = 1;
68	uio->uio_offset = offset;
69	uio->uio_resid = bufsize;
70	uio->uio_rw = uiorw;
71	uio->uio_vmspace = curproc->p_vmspace;
72
73	return uio;
74}
75
76size_t
77rump_uio_getresid(struct uio *uio)
78{
79
80	return uio->uio_resid;
81}
82
83off_t
84rump_uio_getoff(struct uio *uio)
85{
86
87	return uio->uio_offset;
88}
89
90size_t
91rump_uio_free(struct uio *uio)
92{
93	size_t resid;
94
95	resid = uio->uio_resid;
96	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
97	kmem_free(uio, sizeof(*uio));
98
99	return resid;
100}
101
102kauth_cred_t
103rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
104{
105	kauth_cred_t cred;
106	int rv;
107
108	cred = kauth_cred_alloc();
109	kauth_cred_setuid(cred, uid);
110	kauth_cred_seteuid(cred, uid);
111	kauth_cred_setsvuid(cred, uid);
112	kauth_cred_setgid(cred, gid);
113	kauth_cred_setgid(cred, gid);
114	kauth_cred_setegid(cred, gid);
115	kauth_cred_setsvgid(cred, gid);
116	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
117	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
118	assert(rv == 0);
119
120	return cred;
121}
122
123void
124rump_cred_put(kauth_cred_t cred)
125{
126
127	kauth_cred_free(cred);
128}
129