controld_fencing.c
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controld_fencing.c
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	/*
	* Copyright 2004-2023 the Pacemaker project contributors
	*
	* The version control history for this file may have further details.
	*
	* This source code is licensed under the GNU General Public License version 2
	* or later (GPLv2+) WITHOUT ANY WARRANTY.
	*/

	#include <crm_internal.h>
	#include <crm/crm.h>
	#include <crm/msg_xml.h>
	#include <crm/common/xml.h>
	#include <crm/stonith-ng.h>
	#include <crm/fencing/internal.h>

	#include <pacemaker-controld.h>

	static void
	tengine_stonith_history_synced(stonith_t st, stonith_event_t st_event);

	/*
	* stonith failure counting
	*
	* We don't want to get stuck in a permanent fencing loop. Keep track of the
	* number of fencing failures for each target node, and the most we'll restart a
	* transition for.
	*/

	struct st_fail_rec {
	int count;
	};

	static bool fence_reaction_panic = false;
	static unsigned long int stonith_max_attempts = 10;
	static GHashTable *stonith_failures = NULL;

	/*!
	* \internal
	* \brief Update max fencing attempts before giving up
	*
	* \param[in] value New max fencing attempts
	*/
	static void
	update_stonith_max_attempts(const char *value)
	{
	stonith_max_attempts = char2score(value);
	if (stonith_max_attempts < 1UL) {
	stonith_max_attempts = 10UL;
	}
	}

	/*!
	* \internal
	* \brief Configure reaction to notification of local node being fenced
	*
	* \param[in] reaction_s Reaction type
	*/
	static void
	set_fence_reaction(const char *reaction_s)
	{
	if (pcmk__str_eq(reaction_s, "panic", pcmk__str_casei)) {
	fence_reaction_panic = true;

	} else {
	if (!pcmk__str_eq(reaction_s, "stop", pcmk__str_casei)) {
	crm_warn("Invalid value '%s' for %s, using 'stop'",
	reaction_s, XML_CONFIG_ATTR_FENCE_REACTION);
	}
	fence_reaction_panic = false;
	}
	}

	/*!
	* \internal
	* \brief Configure fencing options based on the CIB
	*
	* \param[in,out] options Name/value pairs for configured options
	*/
	void
	controld_configure_fencing(GHashTable *options)
	{
	const char *value = NULL;

	value = g_hash_table_lookup(options, XML_CONFIG_ATTR_FENCE_REACTION);
	set_fence_reaction(value);

	value = g_hash_table_lookup(options, "stonith-max-attempts");
	update_stonith_max_attempts(value);
	}

	static gboolean
	too_many_st_failures(const char *target)
	{
	GHashTableIter iter;
	const char *key = NULL;
	struct st_fail_rec *value = NULL;

	if (stonith_failures == NULL) {
	return FALSE;
	}

	if (target == NULL) {
	g_hash_table_iter_init(&iter, stonith_failures);
	while (g_hash_table_iter_next(&iter, (gpointer *) &key,
	(gpointer *) &value)) {

	if (value->count >= stonith_max_attempts) {
	target = (const char*)key;
	goto too_many;
	}
	}
	} else {
	value = g_hash_table_lookup(stonith_failures, target);
	if ((value != NULL) && (value->count >= stonith_max_attempts)) {
	goto too_many;
	}
	}
	return FALSE;

	too_many:
	crm_warn("Too many failures (%d) to fence %s, giving up",
	value->count, target);
	return TRUE;
	}

	/*!
	* \internal
	* \brief Reset a stonith fail count
	*
	* \param[in] target Name of node to reset, or NULL for all
	*/
	void
	st_fail_count_reset(const char *target)
	{
	if (stonith_failures == NULL) {
	return;
	}

	if (target) {
	struct st_fail_rec *rec = NULL;

	rec = g_hash_table_lookup(stonith_failures, target);
	if (rec) {
	rec->count = 0;
	}
	} else {
	GHashTableIter iter;
	const char *key = NULL;
	struct st_fail_rec *rec = NULL;

	g_hash_table_iter_init(&iter, stonith_failures);
	while (g_hash_table_iter_next(&iter, (gpointer *) &key,
	(gpointer *) &rec)) {
	rec->count = 0;
	}
	}
	}

	static void
	st_fail_count_increment(const char *target)
	{
	struct st_fail_rec *rec = NULL;

	if (stonith_failures == NULL) {
	stonith_failures = pcmk__strkey_table(free, free);
	}

	rec = g_hash_table_lookup(stonith_failures, target);
	if (rec) {
	rec->count++;
	} else {
	rec = malloc(sizeof(struct st_fail_rec));
	if(rec == NULL) {
	return;
	}

	rec->count = 1;
	g_hash_table_insert(stonith_failures, strdup(target), rec);
	}
	}

	/* end stonith fail count functions */


	static void
	cib_fencing_updated(xmlNode msg, int call_id, int rc, xmlNode output,
	void *user_data)
	{
	if (rc < pcmk_ok) {
	crm_err("Fencing update %d for %s: failed - %s (%d)",
	call_id, (char *)user_data, pcmk_strerror(rc), rc);
	crm_log_xml_warn(msg, "Failed update");
	abort_transition(INFINITY, pcmk__graph_shutdown, "CIB update failed",
	NULL);

	} else {
	crm_info("Fencing update %d for %s: complete", call_id, (char *)user_data);
	}
	}

	static void
	send_stonith_update(pcmk__graph_action_t action, const char target,
	const char *uuid)
	{
	int rc = pcmk_ok;
	crm_node_t *peer = NULL;

	/* We (usually) rely on the membership layer to do node_update_cluster,
	* and the peer status callback to do node_update_peer, because the node
	* might have already rejoined before we get the stonith result here.
	*/
	int flags = node_update_join \| node_update_expected;

	/* zero out the node-status & remove all LRM status info */
	xmlNode *node_state = NULL;

	CRM_CHECK(target != NULL, return);
	CRM_CHECK(uuid != NULL, return);

	/* Make sure the membership and join caches are accurate.
	* Try getting any existing node cache entry also by node uuid in case it
	* doesn't have an uname yet.
	*/
	peer = pcmk__get_peer_full(0, target, uuid, CRM_GET_PEER_ANY);

	CRM_CHECK(peer != NULL, return);

	if (peer->state == NULL) {
	/* Usually, we rely on the membership layer to update the cluster state
	* in the CIB. However, if the node has never been seen, do it here, so
	* the node is not considered unclean.
	*/
	flags \|= node_update_cluster;
	}

	if (peer->uuid == NULL) {
	crm_info("Recording uuid '%s' for node '%s'", uuid, target);
	peer->uuid = strdup(uuid);
	}

	crmd_peer_down(peer, TRUE);

	/* Generate a node state update for the CIB */
	node_state = create_node_state_update(peer, flags, NULL, __func__);

	/* we have to mark whether or not remote nodes have already been fenced */
	if (peer->flags & crm_remote_node) {
	char *now_s = pcmk__ttoa(time(NULL));

	crm_xml_add(node_state, XML_NODE_IS_FENCED, now_s);
	free(now_s);
	}

	/* Force our known ID */
	crm_xml_add(node_state, XML_ATTR_ID, uuid);

	rc = controld_globals.cib_conn->cmds->modify(controld_globals.cib_conn,
	XML_CIB_TAG_STATUS, node_state,
	cib_scope_local
	\|cib_can_create);

	/* Delay processing the trigger until the update completes */
	crm_debug("Sending fencing update %d for %s", rc, target);
	fsa_register_cib_callback(rc, strdup(target), cib_fencing_updated);

	// Make sure it sticks
	/* controld_globals.cib_conn->cmds->bump_epoch(controld_globals.cib_conn,
	* cib_scope_local);
	*/

	controld_delete_node_state(peer->uname, controld_section_all,
	cib_scope_local);
	free_xml(node_state);
	return;
	}

	/*!
	* \internal
	* \brief Abort transition due to stonith failure
	*
	* \param[in] abort_action Whether to restart or stop transition
	* \param[in] target Don't restart if this (NULL for any) has too many failures
	* \param[in] reason Log this stonith action XML as abort reason (or NULL)
	*/
	static void
	abort_for_stonith_failure(enum pcmk__graph_next abort_action,
	const char target, const xmlNode reason)
	{
	/* If stonith repeatedly fails, we eventually give up on starting a new
	* transition for that reason.
	*/
	if ((abort_action != pcmk__graph_wait) && too_many_st_failures(target)) {
	abort_action = pcmk__graph_wait;
	}
	abort_transition(INFINITY, abort_action, "Stonith failed", reason);
	}


	/*
	* stonith cleanup list
	*
	* If the DC is shot, proper notifications might not go out.
	* The stonith cleanup list allows the cluster to (re-)send
	* notifications once a new DC is elected.
	*/

	static GList *stonith_cleanup_list = NULL;

	/*!
	* \internal
	* \brief Add a node to the stonith cleanup list
	*
	* \param[in] target Name of node to add
	*/
	void
	add_stonith_cleanup(const char *target) {
	stonith_cleanup_list = g_list_append(stonith_cleanup_list, strdup(target));
	}

	/*!
	* \internal
	* \brief Remove a node from the stonith cleanup list
	*
	* \param[in] Name of node to remove
	*/
	void
	remove_stonith_cleanup(const char *target)
	{
	GList *iter = stonith_cleanup_list;

	while (iter != NULL) {
	GList *tmp = iter;
	char *iter_name = tmp->data;

	iter = iter->next;
	if (pcmk__str_eq(target, iter_name, pcmk__str_casei)) {
	crm_trace("Removing %s from the cleanup list", iter_name);
	stonith_cleanup_list = g_list_delete_link(stonith_cleanup_list, tmp);
	free(iter_name);
	}
	}
	}

	/*!
	* \internal
	* \brief Purge all entries from the stonith cleanup list
	*/
	void
	purge_stonith_cleanup(void)
	{
	if (stonith_cleanup_list) {
	GList *iter = NULL;

	for (iter = stonith_cleanup_list; iter != NULL; iter = iter->next) {
	char *target = iter->data;

	crm_info("Purging %s from stonith cleanup list", target);
	free(target);
	}
	g_list_free(stonith_cleanup_list);
	stonith_cleanup_list = NULL;
	}
	}

	/*!
	* \internal
	* \brief Send stonith updates for all entries in cleanup list, then purge it
	*/
	void
	execute_stonith_cleanup(void)
	{
	GList *iter;

	for (iter = stonith_cleanup_list; iter != NULL; iter = iter->next) {
	char *target = iter->data;
	crm_node_t *target_node = crm_get_peer(0, target);
	const char *uuid = crm_peer_uuid(target_node);

	crm_notice("Marking %s, target of a previous stonith action, as clean", target);
	send_stonith_update(NULL, target, uuid);
	free(target);
	}
	g_list_free(stonith_cleanup_list);
	stonith_cleanup_list = NULL;
	}

	/* end stonith cleanup list functions */


	/* stonith API client
	*
	* Functions that need to interact directly with the fencer via its API
	*/

	static stonith_t *stonith_api = NULL;
	static mainloop_timer_t *controld_fencer_connect_timer = NULL;
	static char *te_client_id = NULL;

	static gboolean
	fail_incompletable_stonith(pcmk__graph_t *graph)
	{
	GList *lpc = NULL;
	const char *task = NULL;
	xmlNode *last_action = NULL;

	if (graph == NULL) {
	return FALSE;
	}

	for (lpc = graph->synapses; lpc != NULL; lpc = lpc->next) {
	GList *lpc2 = NULL;
	pcmk__graph_synapse_t synapse = (pcmk__graph_synapse_t ) lpc->data;

	if (pcmk_is_set(synapse->flags, pcmk__synapse_confirmed)) {
	continue;
	}

	for (lpc2 = synapse->actions; lpc2 != NULL; lpc2 = lpc2->next) {
	pcmk__graph_action_t action = (pcmk__graph_action_t ) lpc2->data;

	if ((action->type != pcmk__cluster_graph_action)
	\|\| pcmk_is_set(action->flags, pcmk__graph_action_confirmed)) {
	continue;
	}

	task = crm_element_value(action->xml, XML_LRM_ATTR_TASK);
	if (pcmk__str_eq(task, PCMK_ACTION_STONITH, pcmk__str_casei)) {
	pcmk__set_graph_action_flags(action, pcmk__graph_action_failed);
	last_action = action->xml;
	pcmk__update_graph(graph, action);
	crm_notice("Failing action %d (%s): fencer terminated",
	action->id, ID(action->xml));
	}
	}
	}

	if (last_action != NULL) {
	crm_warn("Fencer failure resulted in unrunnable actions");
	abort_for_stonith_failure(pcmk__graph_restart, NULL, last_action);
	return TRUE;
	}

	return FALSE;
	}

	static void
	tengine_stonith_connection_destroy(stonith_t st, stonith_event_t e)
	{
	te_cleanup_stonith_history_sync(st, FALSE);

	if (pcmk_is_set(controld_globals.fsa_input_register, R_ST_REQUIRED)) {
	crm_err("Lost fencer connection (will attempt to reconnect)");
	if (!mainloop_timer_running(controld_fencer_connect_timer)) {
	mainloop_timer_start(controld_fencer_connect_timer);
	}
	} else {
	crm_info("Disconnected from fencer");
	}

	if (stonith_api) {
	/* the client API won't properly reconnect notifications
	* if they are still in the table - so remove them
	*/
	if (stonith_api->state != stonith_disconnected) {
	stonith_api->cmds->disconnect(st);
	}
	stonith_api->cmds->remove_notification(stonith_api, NULL);
	}

	if (AM_I_DC) {
	fail_incompletable_stonith(controld_globals.transition_graph);
	trigger_graph();
	}
	}

	/*!
	* \internal
	* \brief Handle an event notification from the fencing API
	*
	* \param[in] st Fencing API connection (ignored)
	* \param[in] event Fencing API event notification
	*/
	static void
	handle_fence_notification(stonith_t st, stonith_event_t event)
	{
	bool succeeded = true;
	const char *executioner = "the cluster";
	const char *client = "a client";
	const char *reason = NULL;
	int exec_status;

	if (te_client_id == NULL) {
	te_client_id = crm_strdup_printf("%s.%lu", crm_system_name,
	(unsigned long) getpid());
	}

	if (event == NULL) {
	crm_err("Notify data not found");
	return;
	}

	if (event->executioner != NULL) {
	executioner = event->executioner;
	}
	if (event->client_origin != NULL) {
	client = event->client_origin;
	}

	exec_status = stonith__event_execution_status(event);
	if ((stonith__event_exit_status(event) != CRM_EX_OK)
	\|\| (exec_status != PCMK_EXEC_DONE)) {
	succeeded = false;
	if (exec_status == PCMK_EXEC_DONE) {
	exec_status = PCMK_EXEC_ERROR;
	}
	}
	reason = stonith__event_exit_reason(event);

	crmd_alert_fencing_op(event);

	if (pcmk__str_eq(PCMK_ACTION_ON, event->action, pcmk__str_none)) {
	// Unfencing doesn't need special handling, just a log message
	if (succeeded) {
	crm_notice("%s was unfenced by %s at the request of %s@%s",
	event->target, executioner, client, event->origin);
	} else {
	crm_err("Unfencing of %s by %s failed (%s%s%s) with exit status %d",
	event->target, executioner,
	pcmk_exec_status_str(exec_status),
	((reason == NULL)? "" : ": "),
	((reason == NULL)? "" : reason),
	stonith__event_exit_status(event));
	}
	return;
	}

	if (succeeded
	&& pcmk__str_eq(event->target, controld_globals.our_nodename,
	pcmk__str_casei)) {
	/* We were notified of our own fencing. Most likely, either fencing was
	* misconfigured, or fabric fencing that doesn't cut cluster
	* communication is in use.
	*
	* Either way, shutting down the local host is a good idea, to require
	* administrator intervention. Also, other nodes would otherwise likely
	* set our status to lost because of the fencing callback and discard
	* our subsequent election votes as "not part of our cluster".
	*/
	crm_crit("We were allegedly just fenced by %s for %s!",
	executioner, event->origin); // Dumps blackbox if enabled
	if (fence_reaction_panic) {
	pcmk__panic(__func__);
	} else {
	crm_exit(CRM_EX_FATAL);
	}
	return; // Should never get here
	}

	/* Update the count of fencing failures for this target, in case we become
	* DC later. The current DC has already updated its fail count in
	* tengine_stonith_callback().
	*/
	if (!AM_I_DC) {
	if (succeeded) {
	st_fail_count_reset(event->target);
	} else {
	st_fail_count_increment(event->target);
	}
	}

	crm_notice("Peer %s was%s terminated (%s) by %s on behalf of %s@%s: "
	"%s%s%s%s " CRM_XS " event=%s",
	event->target, (succeeded? "" : " not"),
	event->action, executioner, client, event->origin,
	(succeeded? "OK" : pcmk_exec_status_str(exec_status)),
	((reason == NULL)? "" : " ("),
	((reason == NULL)? "" : reason),
	((reason == NULL)? "" : ")"),
	event->id);

	if (succeeded) {
	crm_node_t *peer = pcmk__search_known_node_cache(0, event->target,
	CRM_GET_PEER_ANY);
	const char *uuid = NULL;

	if (peer == NULL) {
	return;
	}

	uuid = crm_peer_uuid(peer);

	if (AM_I_DC) {
	/* The DC always sends updates */
	send_stonith_update(NULL, event->target, uuid);

	/* @TODO Ideally, at this point, we'd check whether the fenced node
	* hosted any guest nodes, and call remote_node_down() for them.
	* Unfortunately, the controller doesn't have a simple, reliable way
	* to map hosts to guests. It might be possible to track this in the
	* peer cache via crm_remote_peer_cache_refresh(). For now, we rely
	* on the scheduler creating fence pseudo-events for the guests.
	*/

	if (!pcmk__str_eq(client, te_client_id, pcmk__str_casei)) {
	/* Abort the current transition if it wasn't the cluster that
	* initiated fencing.
	*/
	crm_info("External fencing operation from %s fenced %s",
	client, event->target);
	abort_transition(INFINITY, pcmk__graph_restart,
	"External Fencing Operation", NULL);
	}

	} else if (pcmk__str_eq(controld_globals.dc_name, event->target,
	pcmk__str_null_matches\|pcmk__str_casei)
	&& !pcmk_is_set(peer->flags, crm_remote_node)) {
	// Assume the target was our DC if we don't currently have one

	if (controld_globals.dc_name != NULL) {
	crm_notice("Fencing target %s was our DC", event->target);
	} else {
	crm_notice("Fencing target %s may have been our DC",
	event->target);
	}

	/* Given the CIB resyncing that occurs around elections,
	* have one node update the CIB now and, if the new DC is different,
	* have them do so too after the election
	*/
	if (pcmk__str_eq(event->executioner, controld_globals.our_nodename,
	pcmk__str_casei)) {
	send_stonith_update(NULL, event->target, uuid);
	}
	add_stonith_cleanup(event->target);
	}

	/* If the target is a remote node, and we host its connection,
	* immediately fail all monitors so it can be recovered quickly.
	* The connection won't necessarily drop when a remote node is fenced,
	* so the failure might not otherwise be detected until the next poke.
	*/
	if (pcmk_is_set(peer->flags, crm_remote_node)) {
	remote_ra_fail(event->target);
	}

	crmd_peer_down(peer, TRUE);
	}
	}

	/*!
	* \brief Connect to fencer
	*
	* \param[in] user_data If NULL, retry failures now, otherwise retry in mainloop timer
	*
	* \return G_SOURCE_REMOVE on success, G_SOURCE_CONTINUE to retry
	* \note If user_data is NULL, this will wait 2s between attempts, for up to
	* 30 attempts, meaning the controller could be blocked as long as 58s.
	*/
	gboolean
	controld_timer_fencer_connect(gpointer user_data)
	{
	int rc = pcmk_ok;

	if (stonith_api == NULL) {
	stonith_api = stonith_api_new();
	if (stonith_api == NULL) {
	crm_err("Could not connect to fencer: API memory allocation failed");
	return G_SOURCE_REMOVE;
	}
	}

	if (stonith_api->state != stonith_disconnected) {
	crm_trace("Already connected to fencer, no need to retry");
	return G_SOURCE_REMOVE;
	}

	if (user_data == NULL) {
	// Blocking (retry failures now until successful)
	rc = stonith_api_connect_retry(stonith_api, crm_system_name, 30);
	if (rc != pcmk_ok) {
	crm_err("Could not connect to fencer in 30 attempts: %s "
	CRM_XS " rc=%d", pcmk_strerror(rc), rc);
	}
	} else {
	// Non-blocking (retry failures later in main loop)
	rc = stonith_api->cmds->connect(stonith_api, crm_system_name, NULL);

	if (controld_fencer_connect_timer == NULL) {
	controld_fencer_connect_timer =
	mainloop_timer_add("controld_fencer_connect", 1000,
	TRUE, controld_timer_fencer_connect,
	GINT_TO_POINTER(TRUE));
	}

	if (rc != pcmk_ok) {
	if (pcmk_is_set(controld_globals.fsa_input_register,
	R_ST_REQUIRED)) {
	crm_notice("Fencer connection failed (will retry): %s "
	CRM_XS " rc=%d", pcmk_strerror(rc), rc);

	if (!mainloop_timer_running(controld_fencer_connect_timer)) {
	mainloop_timer_start(controld_fencer_connect_timer);
	}

	return G_SOURCE_CONTINUE;
	} else {
	crm_info("Fencer connection failed (ignoring because no longer required): %s "
	CRM_XS " rc=%d", pcmk_strerror(rc), rc);
	}
	return G_SOURCE_REMOVE;
	}
	}

	if (rc == pcmk_ok) {
	stonith_api->cmds->register_notification(stonith_api,
	T_STONITH_NOTIFY_DISCONNECT,
	tengine_stonith_connection_destroy);
	stonith_api->cmds->register_notification(stonith_api,
	T_STONITH_NOTIFY_FENCE,
	handle_fence_notification);
	stonith_api->cmds->register_notification(stonith_api,
	T_STONITH_NOTIFY_HISTORY_SYNCED,
	tengine_stonith_history_synced);
	te_trigger_stonith_history_sync(TRUE);
	crm_notice("Fencer successfully connected");
	}

	return G_SOURCE_REMOVE;
	}

	void
	controld_disconnect_fencer(bool destroy)
	{
	if (stonith_api) {
	// Prevent fencer connection from coming up again
	controld_clear_fsa_input_flags(R_ST_REQUIRED);

	if (stonith_api->state != stonith_disconnected) {
	stonith_api->cmds->disconnect(stonith_api);
	}
	stonith_api->cmds->remove_notification(stonith_api, NULL);
	}
	if (destroy) {
	if (stonith_api) {
	stonith_api->cmds->free(stonith_api);
	stonith_api = NULL;
	}
	if (controld_fencer_connect_timer) {
	mainloop_timer_del(controld_fencer_connect_timer);
	controld_fencer_connect_timer = NULL;
	}
	if (te_client_id) {
	free(te_client_id);
	te_client_id = NULL;
	}
	}
	}

	static gboolean
	do_stonith_history_sync(gpointer user_data)
	{
	if (stonith_api && (stonith_api->state != stonith_disconnected)) {
	stonith_history_t *history = NULL;

	te_cleanup_stonith_history_sync(stonith_api, FALSE);
	stonith_api->cmds->history(stonith_api,
	st_opt_sync_call \| st_opt_broadcast,
	NULL, &history, 5);
	stonith_history_free(history);
	return TRUE;
	} else {
	crm_info("Skip triggering stonith history-sync as stonith is disconnected");
	return FALSE;
	}
	}

	static void
	tengine_stonith_callback(stonith_t stonith, stonith_callback_data_t data)
	{
	char *uuid = NULL;
	int stonith_id = -1;
	int transition_id = -1;
	pcmk__graph_action_t *action = NULL;
	const char *target = NULL;

	if ((data == NULL) \|\| (data->userdata == NULL)) {
	crm_err("Ignoring fence operation %d result: "
	"No transition key given (bug?)",
	((data == NULL)? -1 : data->call_id));
	return;
	}

	if (!AM_I_DC) {
	const char *reason = stonith__exit_reason(data);

	if (reason == NULL) {
	reason = pcmk_exec_status_str(stonith__execution_status(data));
	}
	crm_notice("Result of fence operation %d: %d (%s) " CRM_XS " key=%s",
	data->call_id, stonith__exit_status(data), reason,
	(const char *) data->userdata);
	return;
	}

	CRM_CHECK(decode_transition_key(data->userdata, &uuid, &transition_id,
	&stonith_id, NULL),
	goto bail);

	if (controld_globals.transition_graph->complete \|\| (stonith_id < 0)
	\|\| !pcmk__str_eq(uuid, controld_globals.te_uuid, pcmk__str_none)
	\|\| (controld_globals.transition_graph->id != transition_id)) {
	crm_info("Ignoring fence operation %d result: "
	"Not from current transition " CRM_XS
	" complete=%s action=%d uuid=%s (vs %s) transition=%d (vs %d)",
	data->call_id,
	pcmk__btoa(controld_globals.transition_graph->complete),
	stonith_id, uuid, controld_globals.te_uuid, transition_id,
	controld_globals.transition_graph->id);
	goto bail;
	}

	action = controld_get_action(stonith_id);
	if (action == NULL) {
	crm_err("Ignoring fence operation %d result: "
	"Action %d not found in transition graph (bug?) "
	CRM_XS " uuid=%s transition=%d",
	data->call_id, stonith_id, uuid, transition_id);
	goto bail;
	}

	target = crm_element_value(action->xml, XML_LRM_ATTR_TARGET);
	if (target == NULL) {
	crm_err("Ignoring fence operation %d result: No target given (bug?)",
	data->call_id);
	goto bail;
	}

	stop_te_timer(action);
	if (stonith__exit_status(data) == CRM_EX_OK) {
	const char *uuid = crm_element_value(action->xml, XML_LRM_ATTR_TARGET_UUID);
	const char *op = crm_meta_value(action->params, "stonith_action");

	crm_info("Fence operation %d for %s succeeded", data->call_id, target);
	if (!(pcmk_is_set(action->flags, pcmk__graph_action_confirmed))) {
	te_action_confirmed(action, NULL);
	if (pcmk__str_eq(PCMK_ACTION_ON, op, pcmk__str_casei)) {
	const char *value = NULL;
	char *now = pcmk__ttoa(time(NULL));
	gboolean is_remote_node = FALSE;

	/* This check is not 100% reliable, since this node is not
	* guaranteed to have the remote node cached. However, it
	* doesn't have to be reliable, since the attribute manager can
	* learn a node's "remoteness" by other means sooner or later.
	* This allows it to learn more quickly if this node does have
	* the information.
	*/
	if (g_hash_table_lookup(crm_remote_peer_cache, uuid) != NULL) {
	is_remote_node = TRUE;
	}

	update_attrd(target, CRM_ATTR_UNFENCED, now, NULL,
	is_remote_node);
	free(now);

	value = crm_meta_value(action->params, XML_OP_ATTR_DIGESTS_ALL);
	update_attrd(target, CRM_ATTR_DIGESTS_ALL, value, NULL,
	is_remote_node);

	value = crm_meta_value(action->params, XML_OP_ATTR_DIGESTS_SECURE);
	update_attrd(target, CRM_ATTR_DIGESTS_SECURE, value, NULL,
	is_remote_node);

	} else if (!(pcmk_is_set(action->flags, pcmk__graph_action_sent_update))) {
	send_stonith_update(action, target, uuid);
	pcmk__set_graph_action_flags(action,
	pcmk__graph_action_sent_update);
	}
	}
	st_fail_count_reset(target);

	} else {
	enum pcmk__graph_next abort_action = pcmk__graph_restart;
	int status = stonith__execution_status(data);
	const char *reason = stonith__exit_reason(data);

	if (reason == NULL) {
	if (status == PCMK_EXEC_DONE) {
	reason = "Agent returned error";
	} else {
	reason = pcmk_exec_status_str(status);
	}
	}
	pcmk__set_graph_action_flags(action, pcmk__graph_action_failed);

	/* If no fence devices were available, there's no use in immediately
	* checking again, so don't start a new transition in that case.
	*/
	if (status == PCMK_EXEC_NO_FENCE_DEVICE) {
	crm_warn("Fence operation %d for %s failed: %s "
	"(aborting transition and giving up for now)",
	data->call_id, target, reason);
	abort_action = pcmk__graph_wait;
	} else {
	crm_notice("Fence operation %d for %s failed: %s "
	"(aborting transition)", data->call_id, target, reason);
	}

	/* Increment the fail count now, so abort_for_stonith_failure() can
	* check it. Non-DC nodes will increment it in
	* handle_fence_notification().
	*/
	st_fail_count_increment(target);
	abort_for_stonith_failure(abort_action, target, NULL);
	}

	pcmk__update_graph(controld_globals.transition_graph, action);
	trigger_graph();

	bail:
	free(data->userdata);
	free(uuid);
	return;
	}

	static int
	fence_with_delay(const char target, const char type, int delay)
	{
	uint32_t options = st_opt_none; // Group of enum stonith_call_options
	int timeout_sec = (int) (controld_globals.transition_graph->stonith_timeout
	/ 1000);

	if (crmd_join_phase_count(crm_join_confirmed) == 1) {
	stonith__set_call_options(options, target, st_opt_allow_suicide);
	}
	return stonith_api->cmds->fence_with_delay(stonith_api, options, target,
	type, timeout_sec, 0, delay);
	}

	/*!
	* \internal
	* \brief Execute a fencing action from a transition graph
	*
	* \param[in] graph Transition graph being executed (ignored)
	* \param[in] action Fencing action to execute
	*
	* \return Standard Pacemaker return code
	*/
	int
	controld_execute_fence_action(pcmk__graph_t *graph,
	pcmk__graph_action_t *action)
	{
	int rc = 0;
	const char *id = ID(action->xml);
	const char *uuid = crm_element_value(action->xml, XML_LRM_ATTR_TARGET_UUID);
	const char *target = crm_element_value(action->xml, XML_LRM_ATTR_TARGET);
	const char *type = crm_meta_value(action->params, "stonith_action");
	char *transition_key = NULL;
	const char *priority_delay = NULL;
	int delay_i = 0;
	gboolean invalid_action = FALSE;
	int stonith_timeout = (int) (controld_globals.transition_graph->stonith_timeout
	/ 1000);

	CRM_CHECK(id != NULL, invalid_action = TRUE);
	CRM_CHECK(uuid != NULL, invalid_action = TRUE);
	CRM_CHECK(type != NULL, invalid_action = TRUE);
	CRM_CHECK(target != NULL, invalid_action = TRUE);

	if (invalid_action) {
	crm_log_xml_warn(action->xml, "BadAction");
	return EPROTO;
	}

	priority_delay = crm_meta_value(action->params, XML_CONFIG_ATTR_PRIORITY_FENCING_DELAY);

	crm_notice("Requesting fencing (%s) targeting node %s "
	CRM_XS " action=%s timeout=%i%s%s",
	type, target, id, stonith_timeout,
	priority_delay ? " priority_delay=" : "",
	priority_delay ? priority_delay : "");

	/* Passing NULL means block until we can connect... */
	controld_timer_fencer_connect(NULL);

	pcmk__scan_min_int(priority_delay, &delay_i, 0);
	rc = fence_with_delay(target, type, delay_i);
	transition_key = pcmk__transition_key(controld_globals.transition_graph->id,
	action->id, 0,
	controld_globals.te_uuid),
	stonith_api->cmds->register_callback(stonith_api, rc,
	(stonith_timeout
	+ (delay_i > 0 ? delay_i : 0)),
	st_opt_timeout_updates, transition_key,
	"tengine_stonith_callback",
	tengine_stonith_callback);
	return pcmk_rc_ok;
	}

	bool
	controld_verify_stonith_watchdog_timeout(const char *value)
	{
	long st_timeout = value? crm_get_msec(value) : 0;
	const char *our_nodename = controld_globals.our_nodename;
	gboolean rv = TRUE;

	if (st_timeout == 0
	\|\| (stonith_api && (stonith_api->state != stonith_disconnected) &&
	stonith__watchdog_fencing_enabled_for_node_api(stonith_api,
	our_nodename))) {
	rv = pcmk__valid_sbd_timeout(value);
	}
	return rv;
	}

	/* end stonith API client functions */


	/*
	* stonith history synchronization
	*
	* Each node's fencer keeps track of a cluster-wide fencing history. When a node
	* joins or leaves, we need to synchronize the history across all nodes.
	*/

	static crm_trigger_t *stonith_history_sync_trigger = NULL;
	static mainloop_timer_t *stonith_history_sync_timer_short = NULL;
	static mainloop_timer_t *stonith_history_sync_timer_long = NULL;

	void
	te_cleanup_stonith_history_sync(stonith_t *st, bool free_timers)
	{
	if (free_timers) {
	mainloop_timer_del(stonith_history_sync_timer_short);
	stonith_history_sync_timer_short = NULL;
	mainloop_timer_del(stonith_history_sync_timer_long);
	stonith_history_sync_timer_long = NULL;
	} else {
	mainloop_timer_stop(stonith_history_sync_timer_short);
	mainloop_timer_stop(stonith_history_sync_timer_long);
	}

	if (st) {
	st->cmds->remove_notification(st, T_STONITH_NOTIFY_HISTORY_SYNCED);
	}
	}

	static void
	tengine_stonith_history_synced(stonith_t st, stonith_event_t st_event)
	{
	te_cleanup_stonith_history_sync(st, FALSE);
	crm_debug("Fence-history synced - cancel all timers");
	}

	static gboolean
	stonith_history_sync_set_trigger(gpointer user_data)
	{
	mainloop_set_trigger(stonith_history_sync_trigger);
	return FALSE;
	}

	void
	te_trigger_stonith_history_sync(bool long_timeout)
	{
	/* trigger a sync in 5s to give more nodes the
	* chance to show up so that we don't create
	* unnecessary stonith-history-sync traffic
	*
	* the long timeout of 30s is there as a fallback
	* so that after a successful connection to fenced
	* we will wait for 30s for the DC to trigger a
	* history-sync
	* if this doesn't happen we trigger a sync locally
	* (e.g. fenced segfaults and is restarted by pacemakerd)
	*/

	/* as we are finally checking the stonith-connection
	* in do_stonith_history_sync we should be fine
	* leaving stonith_history_sync_time & stonith_history_sync_trigger
	* around
	*/
	if (stonith_history_sync_trigger == NULL) {
	stonith_history_sync_trigger =
	mainloop_add_trigger(G_PRIORITY_LOW,
	do_stonith_history_sync, NULL);
	}

	if (long_timeout) {
	if(stonith_history_sync_timer_long == NULL) {
	stonith_history_sync_timer_long =
	mainloop_timer_add("history_sync_long", 30000,
	FALSE, stonith_history_sync_set_trigger,
	NULL);
	}
	crm_info("Fence history will be synchronized cluster-wide within 30 seconds");
	mainloop_timer_start(stonith_history_sync_timer_long);
	} else {
	if(stonith_history_sync_timer_short == NULL) {
	stonith_history_sync_timer_short =
	mainloop_timer_add("history_sync_short", 5000,
	FALSE, stonith_history_sync_set_trigger,
	NULL);
	}
	crm_info("Fence history will be synchronized cluster-wide within 5 seconds");
	mainloop_timer_start(stonith_history_sync_timer_short);
	}

	}

	/* end stonith history synchronization functions */

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