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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 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdlib.h>
#include <sys/types.h>
#include <dhcpmsg.h>
#include <dhcpagent_ipc.h>
#include "agent.h"
#include "states.h"
#include "interface.h"
#include "ipc_action.h"
#include "util.h"
static iu_tq_callback_t ipc_action_timeout;
/*
* ipc_action_init(): initializes the ipc_action structure
*
* input: ipc_action_t *: the structure to initialize
* output: void
*/
void
ipc_action_init(ipc_action_t *ia)
{
ia->ia_cmd = 0;
ia->ia_fd = -1;
ia->ia_tid = -1;
ia->ia_eid = -1;
ia->ia_request = NULL;
}
/*
* ipc_action_start(): starts an ipc_action request on a DHCP state machine
*
* input: dhcp_smach_t *: the state machine to start the action on
* ipc_action_t *: request structure
* output: B_TRUE if the request is started successfully, B_FALSE otherwise
* original request is still valid on failure, consumed otherwise.
*/
boolean_t
ipc_action_start(dhcp_smach_t *dsmp, ipc_action_t *iareq)
{
struct ipc_action *ia = &dsmp->dsm_ia;
if (ia->ia_fd != -1 || ia->ia_tid != -1 || iareq->ia_fd == -1) {
dhcpmsg(MSG_CRIT, "ipc_action_start: attempted restart on %s",
dsmp->dsm_name);
return (B_FALSE);
}
if (!async_cancel(dsmp)) {
dhcpmsg(MSG_WARNING, "ipc_action_start: unable to cancel "
"action on %s", dsmp->dsm_name);
return (B_FALSE);
}
if (iareq->ia_request->timeout == DHCP_IPC_WAIT_DEFAULT)
iareq->ia_request->timeout = DHCP_IPC_DEFAULT_WAIT;
if (iareq->ia_request->timeout == DHCP_IPC_WAIT_FOREVER) {
iareq->ia_tid = -1;
} else {
iareq->ia_tid = iu_schedule_timer(tq,
iareq->ia_request->timeout, ipc_action_timeout, dsmp);
if (iareq->ia_tid == -1) {
dhcpmsg(MSG_ERROR, "ipc_action_start: failed to set "
"timer for %s on %s",
dhcp_ipc_type_to_string(iareq->ia_cmd),
dsmp->dsm_name);
return (B_FALSE);
}
hold_smach(dsmp);
}
*ia = *iareq;
/* We've taken ownership, so the input request is now invalid */
ipc_action_init(iareq);
dhcpmsg(MSG_DEBUG, "ipc_action_start: started %s (command %d) on %s",
dhcp_ipc_type_to_string(ia->ia_cmd), ia->ia_cmd, dsmp->dsm_name);
dsmp->dsm_dflags |= DHCP_IF_BUSY;
/* This cannot fail due to the async_cancel above */
(void) async_start(dsmp, ia->ia_cmd, B_TRUE);
return (B_TRUE);
}
/*
* ipc_action_finish(): completes an ipc_action request on an interface
*
* input: dhcp_smach_t *: the state machine to complete the action on
* int: the reason why the action finished (nonzero on error)
* output: void
*/
void
ipc_action_finish(dhcp_smach_t *dsmp, int reason)
{
struct ipc_action *ia = &dsmp->dsm_ia;
dsmp->dsm_dflags &= ~DHCP_IF_BUSY;
if (dsmp->dsm_ia.ia_fd == -1) {
dhcpmsg(MSG_ERROR,
"ipc_action_finish: attempted to finish unknown action "
"on %s", dsmp->dsm_name);
return;
}
dhcpmsg(MSG_DEBUG,
"ipc_action_finish: finished %s (command %d) on %s: %d",
dhcp_ipc_type_to_string(ia->ia_cmd), (int)ia->ia_cmd,
dsmp->dsm_name, reason);
/*
* if we can't cancel this timer, we're really in the
* twilight zone. however, as long as we don't drop the
* reference to the state machine, it shouldn't hurt us
*/
if (dsmp->dsm_ia.ia_tid != -1 &&
iu_cancel_timer(tq, dsmp->dsm_ia.ia_tid, NULL) == 1) {
dsmp->dsm_ia.ia_tid = -1;
release_smach(dsmp);
}
if (reason == 0)
send_ok_reply(ia);
else
send_error_reply(ia, reason);
async_finish(dsmp);
}
/*
* ipc_action_timeout(): times out an ipc_action on a state machine (the
* request continues asynchronously, however)
*
* input: iu_tq_t *: unused
* void *: the dhcp_smach_t * the ipc_action was pending on
* output: void
*/
/* ARGSUSED */
static void
ipc_action_timeout(iu_tq_t *tq, void *arg)
{
dhcp_smach_t *dsmp = arg;
struct ipc_action *ia = &dsmp->dsm_ia;
dsmp->dsm_dflags &= ~DHCP_IF_BUSY;
ia->ia_tid = -1;
dhcpmsg(MSG_VERBOSE, "ipc timeout waiting for agent to complete "
"%s (command %d) for %s", dhcp_ipc_type_to_string(ia->ia_cmd),
ia->ia_cmd, dsmp->dsm_name);
send_error_reply(ia, DHCP_IPC_E_TIMEOUT);
async_finish(dsmp);
release_smach(dsmp);
}
/*
* send_ok_reply(): sends an "ok" reply to a request and closes the ipc
* connection
*
* input: ipc_action_t *: the request to reply to
* output: void
* note: the request is freed (thus the request must be on the heap).
*/
void
send_ok_reply(ipc_action_t *ia)
{
send_error_reply(ia, 0);
}
/*
* send_error_reply(): sends an "error" reply to a request and closes the ipc
* connection
*
* input: ipc_action_t *: the request to reply to
* int: the error to send back on the ipc connection
* output: void
* note: the request is freed (thus the request must be on the heap).
*/
void
send_error_reply(ipc_action_t *ia, int error)
{
send_data_reply(ia, error, DHCP_TYPE_NONE, NULL, 0);
}
/*
* send_data_reply(): sends a reply to a request and closes the ipc connection
*
* input: ipc_action_t *: the request to reply to
* int: the status to send back on the ipc connection (zero for
* success, DHCP_IPC_E_* otherwise).
* dhcp_data_type_t: the type of the payload in the reply
* const void *: the payload for the reply, or NULL if there is no
* payload
* size_t: the size of the payload
* output: void
* note: the request is freed (thus the request must be on the heap).
*/
void
send_data_reply(ipc_action_t *ia, int error, dhcp_data_type_t type,
const void *buffer, size_t size)
{
dhcp_ipc_reply_t *reply;
int retval;
if (ia->ia_fd == -1 || ia->ia_request == NULL)
return;
reply = dhcp_ipc_alloc_reply(ia->ia_request, error, buffer, size,
type);
if (reply == NULL) {
dhcpmsg(MSG_ERR, "send_data_reply: cannot allocate reply");
} else if ((retval = dhcp_ipc_send_reply(ia->ia_fd, reply)) != 0) {
dhcpmsg(MSG_ERROR, "send_data_reply: dhcp_ipc_send_reply: %s",
dhcp_ipc_strerror(retval));
}
/*
* free the request since we've now used it to send our reply.
* we can also close the socket since the reply has been sent.
*/
free(reply);
free(ia->ia_request);
if (ia->ia_eid != -1)
(void) iu_unregister_event(eh, ia->ia_eid, NULL);
(void) dhcp_ipc_close(ia->ia_fd);
ia->ia_request = NULL;
ia->ia_fd = -1;
ia->ia_eid = -1;
}
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