Convert casperd(8) daemon to the libcasper.

After calling the cap_init(3) function Casper will fork from it's original
process, using pdfork(2). Forking from a process has a lot of advantages:
1. We have the same cwd as the original process.
2. The same uid, gid and groups.
3. The same MAC labels.
4. The same descriptor table.
5. The same routing table.
6. The same umask.
7. The same cpuset(1).
From now services are also in form of libraries.
We also removed libcapsicum at all and converts existing program using Casper
to new architecture.

Discussed with:		pjd, jonathan, ed, drysdale@google.com, emaste
Partially reviewed by:	drysdale@google.com, bdrewery
Approved by:		pjd (mentor)
Differential Revision:	https://reviews.freebsd.org/D4277

1 files changed, 0 insertions, 266 deletions

diff --git a/lib/libcapsicum/libcapsicum.c b/lib/libcapsicum/libcapsicum.c
deleted file mode 100644
index 8c4d04d..0000000
--- a/lib/libcapsicum/libcapsicum.c
+++ /dev/null
@@ -1,266 +0,0 @@
-/*-
- * 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));
-}