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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2018, Joyent, Inc.
*/
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <stddef.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <thread.h>
#include <synch.h>
#include <libilb_impl.h>
#include <libilb.h>
/* Assertion: the calling thread has a hold on the handle */
static void
i_ilb_socket_set_err(ilb_handle_t h, ilb_status_t err)
{
ilb_handle_impl_t *hi = (ilb_handle_impl_t *)h;
if (h == ILB_INVALID_HANDLE)
return;
hi->h_valid = B_FALSE;
hi->h_error = err;
}
ilb_status_t
ilb_open(ilb_handle_t *hp)
{
ilb_handle_impl_t *hi = NULL;
int s = -1;
struct sockaddr_un sa = {AF_UNIX, SOCKET_PATH};
ilb_status_t rc = ILB_STATUS_OK;
int sobufsz;
if (hp == NULL)
return (ILB_STATUS_EINVAL);
hi = calloc(1, sizeof (*hi));
if (hi == NULL)
return (ILB_STATUS_ENOMEM);
if (cond_init(&hi->h_cv, USYNC_THREAD, NULL) != 0) {
rc = ILB_STATUS_INTERNAL;
goto out;
}
if (mutex_init(&hi->h_lock, USYNC_THREAD | LOCK_ERRORCHECK, NULL)
!= 0) {
rc = ILB_STATUS_INTERNAL;
goto out;
}
hi->h_busy = B_FALSE;
if ((s = socket(PF_UNIX, SOCK_SEQPACKET, 0)) == -1 ||
connect(s, (struct sockaddr *)&sa, sizeof (sa.sun_path))
== -1) {
rc = ILB_STATUS_SOCKET;
goto out;
}
/* The socket buffer must be at least the max size of a message */
sobufsz = ILBD_MSG_SIZE;
if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &sobufsz,
sizeof (sobufsz)) != 0) {
rc = ILB_STATUS_SOCKET;
(void) close(s);
goto out;
}
if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, &sobufsz,
sizeof (sobufsz)) != 0) {
rc = ILB_STATUS_SOCKET;
(void) close(s);
goto out;
}
hi->h_socket = s;
hi->h_valid = B_TRUE;
out:
if (rc != ILB_STATUS_OK && s != -1)
(void) close(s);
if (rc == ILB_STATUS_OK) {
*hp = (ilb_handle_t)hi;
} else {
free(hi);
*hp = ILB_INVALID_HANDLE;
}
return (rc);
}
ilb_status_t
ilb_close(ilb_handle_t h)
{
ilb_handle_impl_t *hi = (ilb_handle_impl_t *)h;
if (h == ILB_INVALID_HANDLE)
return (ILB_STATUS_EINVAL);
if (mutex_lock(&hi->h_lock) != 0)
return (ILB_STATUS_INTERNAL);
/* Somebody has done a close, no need to do anything. */
if (hi->h_closing) {
return (ILB_STATUS_OK);
} else {
hi->h_closing = B_TRUE;
hi->h_error = ILB_STATUS_HANDLE_CLOSING;
}
/* Wait until there is nobody waiting. */
while (hi->h_waiter > 0) {
if (cond_wait(&hi->h_cv, &hi->h_lock) != 0) {
(void) mutex_unlock(&hi->h_lock);
return (ILB_STATUS_INTERNAL);
}
}
/* No one is waiting, proceed to free the handle. */
(void) close(hi->h_socket);
(void) mutex_destroy(&hi->h_lock);
(void) cond_destroy(&hi->h_cv);
free(hi);
return (ILB_STATUS_OK);
}
/*
* Unified routine to communicate with ilbd.
*
* If ic is non-NULL, it means that the caller wants to send something
* to ilbd and expects a reply. If ic is NULL, it means that the caller
* only expects to receive from ilbd.
*
* The rbuf is the buffer supplied by the caller for receiving. If it
* is NULL, it means that there is no reply expected.
*
* This function will not close() the socket to kernel unless there is
* an error. If the transaction only consists of one exchange, the caller
* can use i_ilb_close_comm() to close() the socket when done.
*/
ilb_status_t
i_ilb_do_comm(ilb_handle_t h, ilb_comm_t *ic, size_t ic_sz, ilb_comm_t *rbuf,
size_t *rbufsz)
{
ilb_status_t rc = ILB_STATUS_OK;
int r, s;
ilb_handle_impl_t *hi = (ilb_handle_impl_t *)h;
assert(rbuf != NULL);
if (h == ILB_INVALID_HANDLE)
return (ILB_STATUS_EINVAL);
if (mutex_lock(&hi->h_lock) != 0)
return (ILB_STATUS_INTERNAL);
hi->h_waiter++;
while (hi->h_busy) {
if (cond_wait(&hi->h_cv, &hi->h_lock) != 0) {
hi->h_waiter--;
(void) cond_signal(&hi->h_cv);
(void) mutex_unlock(&hi->h_lock);
return (ILB_STATUS_INTERNAL);
}
}
if (!hi->h_valid || hi->h_closing) {
hi->h_waiter--;
(void) cond_signal(&hi->h_cv);
(void) mutex_unlock(&hi->h_lock);
return (hi->h_error);
}
hi->h_busy = B_TRUE;
(void) mutex_unlock(&hi->h_lock);
s = hi->h_socket;
r = send(s, ic, ic_sz, 0);
if (r < ic_sz) {
rc = ILB_STATUS_WRITE;
goto socket_error;
}
rc = ILB_STATUS_OK;
if ((r = recv(s, rbuf, *rbufsz, 0)) <= 0) {
rc = ILB_STATUS_READ;
} else {
*rbufsz = r;
goto out;
}
socket_error:
i_ilb_socket_set_err(h, rc);
out:
(void) mutex_lock(&hi->h_lock);
hi->h_busy = B_FALSE;
hi->h_waiter--;
(void) cond_signal(&hi->h_cv);
(void) mutex_unlock(&hi->h_lock);
return (rc);
}
void
i_ilb_close_comm(ilb_handle_t h)
{
(void) ilb_close(h);
}
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