freebsd-skq/lib/libcapsicum/libcapsicum.c
oshogbo 55d9527633 Let the nv.h and dnv.h includes be only in sys directory.
Change consumers to include those files from sys.
Add duplicated files to ObsoleteFiles.

Approved by:	pjd (mentor)
2015-07-02 21:58:10 +00:00

267 lines
5.7 KiB
C

/*-
* Copyright (c) 2012-2013 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Pawel Jakub Dawidek under sponsorship from
* the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/nv.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "libcapsicum.h"
#include "libcapsicum_impl.h"
/*
* Structure describing communication channel between two separated processes.
*/
#define CAP_CHANNEL_MAGIC 0xcac8a31
struct cap_channel {
/*
* Magic value helps to ensure that a pointer to the right structure is
* passed to our functions.
*/
int cch_magic;
/* Socket descriptor for IPC. */
int cch_sock;
};
bool
fd_is_valid(int fd)
{
return (fcntl(fd, F_GETFL) != -1 || errno != EBADF);
}
cap_channel_t *
cap_init(void)
{
cap_channel_t *chan;
struct sockaddr_un sun;
int serrno, sock;
bzero(&sun, sizeof(sun));
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, CASPER_SOCKPATH, sizeof(sun.sun_path));
sun.sun_len = SUN_LEN(&sun);
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock == -1)
return (NULL);
if (connect(sock, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
serrno = errno;
close(sock);
errno = serrno;
return (NULL);
}
chan = cap_wrap(sock);
if (chan == NULL) {
serrno = errno;
close(sock);
errno = serrno;
return (NULL);
}
return (chan);
}
cap_channel_t *
cap_wrap(int sock)
{
cap_channel_t *chan;
if (!fd_is_valid(sock))
return (NULL);
chan = malloc(sizeof(*chan));
if (chan != NULL) {
chan->cch_sock = sock;
chan->cch_magic = CAP_CHANNEL_MAGIC;
}
return (chan);
}
int
cap_unwrap(cap_channel_t *chan)
{
int sock;
assert(chan != NULL);
assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
sock = chan->cch_sock;
chan->cch_magic = 0;
free(chan);
return (sock);
}
cap_channel_t *
cap_clone(const cap_channel_t *chan)
{
cap_channel_t *newchan;
nvlist_t *nvl;
int newsock;
assert(chan != NULL);
assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
nvl = nvlist_create(0);
nvlist_add_string(nvl, "cmd", "clone");
nvl = cap_xfer_nvlist(chan, nvl, 0);
if (nvl == NULL)
return (NULL);
if (nvlist_get_number(nvl, "error") != 0) {
errno = (int)nvlist_get_number(nvl, "error");
nvlist_destroy(nvl);
return (NULL);
}
newsock = nvlist_take_descriptor(nvl, "sock");
nvlist_destroy(nvl);
newchan = cap_wrap(newsock);
if (newchan == NULL) {
int serrno;
serrno = errno;
close(newsock);
errno = serrno;
}
return (newchan);
}
void
cap_close(cap_channel_t *chan)
{
assert(chan != NULL);
assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
chan->cch_magic = 0;
close(chan->cch_sock);
free(chan);
}
int
cap_sock(const cap_channel_t *chan)
{
assert(chan != NULL);
assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
return (chan->cch_sock);
}
int
cap_limit_set(const cap_channel_t *chan, nvlist_t *limits)
{
nvlist_t *nvlmsg;
int error;
nvlmsg = nvlist_create(0);
nvlist_add_string(nvlmsg, "cmd", "limit_set");
nvlist_add_nvlist(nvlmsg, "limits", limits);
nvlmsg = cap_xfer_nvlist(chan, nvlmsg, 0);
if (nvlmsg == NULL) {
nvlist_destroy(limits);
return (-1);
}
error = (int)nvlist_get_number(nvlmsg, "error");
nvlist_destroy(nvlmsg);
nvlist_destroy(limits);
if (error != 0) {
errno = error;
return (-1);
}
return (0);
}
int
cap_limit_get(const cap_channel_t *chan, nvlist_t **limitsp)
{
nvlist_t *nvlmsg;
int error;
nvlmsg = nvlist_create(0);
nvlist_add_string(nvlmsg, "cmd", "limit_get");
nvlmsg = cap_xfer_nvlist(chan, nvlmsg, 0);
if (nvlmsg == NULL)
return (-1);
error = (int)nvlist_get_number(nvlmsg, "error");
if (error != 0) {
nvlist_destroy(nvlmsg);
errno = error;
return (-1);
}
if (nvlist_exists_null(nvlmsg, "limits"))
*limitsp = NULL;
else
*limitsp = nvlist_take_nvlist(nvlmsg, "limits");
nvlist_destroy(nvlmsg);
return (0);
}
int
cap_send_nvlist(const cap_channel_t *chan, const nvlist_t *nvl)
{
assert(chan != NULL);
assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
return (nvlist_send(chan->cch_sock, nvl));
}
nvlist_t *
cap_recv_nvlist(const cap_channel_t *chan, int flags)
{
assert(chan != NULL);
assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
return (nvlist_recv(chan->cch_sock, flags));
}
nvlist_t *
cap_xfer_nvlist(const cap_channel_t *chan, nvlist_t *nvl, int flags)
{
assert(chan != NULL);
assert(chan->cch_magic == CAP_CHANNEL_MAGIC);
return (nvlist_xfer(chan->cch_sock, nvl, flags));
}