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	diff --git a/daemons/fenced/fenced_commands.c b/daemons/fenced/fenced_commands.c
	index 34c956f5cd..6f325b9e83 100644
	--- a/daemons/fenced/fenced_commands.c
	+++ b/daemons/fenced/fenced_commands.c
	@@ -1,3231 +1,3235 @@
	/*
	* Copyright 2009-2021 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 <sys/param.h>
	#include <stdio.h>
	#include <sys/types.h>
	#include <sys/wait.h>
	#include <sys/stat.h>
	#include <unistd.h>
	#include <sys/utsname.h>

	#include <stdlib.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <ctype.h>

	#include <crm/crm.h>
	#include <crm/msg_xml.h>
	#include <crm/common/ipc.h>
	#include <crm/common/ipc_internal.h>
	#include <crm/cluster/internal.h>
	#include <crm/common/mainloop.h>

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

	#include <pacemaker-fenced.h>

	GHashTable *device_list = NULL;
	GHashTable *topology = NULL;
	GList *cmd_list = NULL;

	struct device_search_s {
	/* target of fence action */
	char *host;
	/* requested fence action */
	char *action;
	/* timeout to use if a device is queried dynamically for possible targets */
	int per_device_timeout;
	/* number of registered fencing devices at time of request */
	int replies_needed;
	/* number of device replies received so far */
	int replies_received;
	/* whether the target is eligible to perform requested action (or off) */
	bool allow_suicide;

	/* private data to pass to search callback function */
	void *user_data;
	/* function to call when all replies have been received */
	void (callback) (GList devices, void *user_data);
	/* devices capable of performing requested action (or off if remapping) */
	GList *capable;
	};

	static gboolean stonith_device_dispatch(gpointer user_data);
	static void st_child_done(int pid, const pcmk__action_result_t *result,
	void *user_data);
	static void stonith_send_reply(xmlNode * reply, int call_options, const char *remote_peer,
	const char *client_id);

	static void search_devices_record_result(struct device_search_s search, const char device,
	gboolean can_fence);

	static int get_agent_metadata(const char agent, xmlNode *metadata);
	static void read_action_metadata(stonith_device_t *device);

	typedef struct async_command_s {

	int id;
	int pid;
	int fd_stdout;
	int options;
	int default_timeout; /* seconds */
	int timeout; /* seconds */

	int start_delay; /* seconds */
	int delay_id;

	char *op;
	char *origin;
	char *client;
	char *client_name;
	char *remote_op_id;

	char *victim;
	uint32_t victim_nodeid;
	char *action;
	char *device;

	GList *device_list;
	GList *device_next;

	void *internal_user_data;
	void (done_cb) (int pid, const pcmk__action_result_t result,
	void *user_data);
	guint timer_sigterm;
	guint timer_sigkill;
	/*! If the operation timed out, this is the last signal
	* we sent to the process to get it to terminate */
	int last_timeout_signo;

	stonith_device_t *active_on;
	stonith_device_t *activating_on;
	} async_command_t;

	static xmlNode construct_async_reply(async_command_t cmd,
	const pcmk__action_result_t *result);

	static gboolean
	is_action_required(const char action, stonith_device_t device)
	{
	return device && device->automatic_unfencing && pcmk__str_eq(action, "on",
	pcmk__str_casei);
	}

	static int
	get_action_delay_max(stonith_device_t * device, const char * action)
	{
	const char *value = NULL;
	int delay_max = 0;

	if (!pcmk__is_fencing_action(action)) {
	return 0;
	}

	value = g_hash_table_lookup(device->params, PCMK_STONITH_DELAY_MAX);
	if (value) {
	delay_max = crm_parse_interval_spec(value) / 1000;
	}

	return delay_max;
	}

	static int
	get_action_delay_base(stonith_device_t device, const char action, const char *victim)
	{
	char *hash_value = NULL;
	int delay_base = 0;

	if (!pcmk__is_fencing_action(action)) {
	return 0;
	}

	hash_value = g_hash_table_lookup(device->params, PCMK_STONITH_DELAY_BASE);

	if (hash_value) {
	char *value = strdup(hash_value);
	char *valptr = value;

	CRM_ASSERT(value != NULL);

	if (victim) {
	for (char *val = strtok(value, "; \t"); val != NULL; val = strtok(NULL, "; \t")) {
	char *mapval = strchr(val, ':');

	if (mapval == NULL \|\| mapval[1] == 0) {
	crm_err("pcmk_delay_base: empty value in mapping", val);
	continue;
	}

	if (mapval != val && strncasecmp(victim, val, (size_t)(mapval - val)) == 0) {
	value = mapval + 1;
	crm_debug("pcmk_delay_base mapped to %s for %s", value, victim);
	break;
	}
	}
	}

	if (strchr(value, ':') == 0) {
	delay_base = crm_parse_interval_spec(value) / 1000;
	}

	free(valptr);
	}

	return delay_base;
	}

	/*!
	* \internal
	* \brief Override STONITH timeout with pcmk_*_timeout if available
	*
	* \param[in] device STONITH device to use
	* \param[in] action STONITH action name
	* \param[in] default_timeout Timeout to use if device does not have
	* a pcmk_*_timeout parameter for action
	*
	* \return Value of pcmk_(action)_timeout if available, otherwise default_timeout
	* \note For consistency, it would be nice if reboot/off/on timeouts could be
	* set the same way as start/stop/monitor timeouts, i.e. with an
	* <operation> entry in the fencing resource configuration. However that
	* is insufficient because fencing devices may be registered directly via
	* the fencer's register_device() API instead of going through the CIB
	* (e.g. stonith_admin uses it for its -R option, and the executor uses it
	* to ensure a device is registered when a command is issued). As device
	* properties, pcmk_*_timeout parameters can be grabbed by the fencer when
	* the device is registered, whether by CIB change or API call.
	*/
	static int
	get_action_timeout(stonith_device_t * device, const char *action, int default_timeout)
	{
	if (action && device && device->params) {
	char buffer[64] = { 0, };
	const char *value = NULL;

	/* If "reboot" was requested but the device does not support it,
	* we will remap to "off", so check timeout for "off" instead
	*/
	if (pcmk__str_eq(action, "reboot", pcmk__str_casei)
	&& !pcmk_is_set(device->flags, st_device_supports_reboot)) {
	crm_trace("%s doesn't support reboot, using timeout for off instead",
	device->id);
	action = "off";
	}

	/* If the device config specified an action-specific timeout, use it */
	snprintf(buffer, sizeof(buffer), "pcmk_%s_timeout", action);
	value = g_hash_table_lookup(device->params, buffer);
	if (value) {
	return atoi(value);
	}
	}
	return default_timeout;
	}

	static void
	free_async_command(async_command_t * cmd)
	{
	if (!cmd) {
	return;
	}

	if (cmd->delay_id) {
	g_source_remove(cmd->delay_id);
	}

	cmd_list = g_list_remove(cmd_list, cmd);

	g_list_free_full(cmd->device_list, free);
	free(cmd->device);
	free(cmd->action);
	free(cmd->victim);
	free(cmd->remote_op_id);
	free(cmd->client);
	free(cmd->client_name);
	free(cmd->origin);
	free(cmd->op);
	free(cmd);
	}

	static async_command_t *
	create_async_command(xmlNode * msg)
	{
	async_command_t *cmd = NULL;
	xmlNode *op = get_xpath_object("//@" F_STONITH_ACTION, msg, LOG_ERR);
	const char *action = crm_element_value(op, F_STONITH_ACTION);

	CRM_CHECK(action != NULL, crm_log_xml_warn(msg, "NoAction"); return NULL);

	crm_log_xml_trace(msg, "Command");
	cmd = calloc(1, sizeof(async_command_t));
	crm_element_value_int(msg, F_STONITH_CALLID, &(cmd->id));
	crm_element_value_int(msg, F_STONITH_CALLOPTS, &(cmd->options));
	crm_element_value_int(msg, F_STONITH_TIMEOUT, &(cmd->default_timeout));
	cmd->timeout = cmd->default_timeout;
	// Value -1 means disable any static/random fencing delays
	crm_element_value_int(msg, F_STONITH_DELAY, &(cmd->start_delay));

	cmd->origin = crm_element_value_copy(msg, F_ORIG);
	cmd->remote_op_id = crm_element_value_copy(msg, F_STONITH_REMOTE_OP_ID);
	cmd->client = crm_element_value_copy(msg, F_STONITH_CLIENTID);
	cmd->client_name = crm_element_value_copy(msg, F_STONITH_CLIENTNAME);
	cmd->op = crm_element_value_copy(msg, F_STONITH_OPERATION);
	cmd->action = strdup(action);
	cmd->victim = crm_element_value_copy(op, F_STONITH_TARGET);
	cmd->device = crm_element_value_copy(op, F_STONITH_DEVICE);

	CRM_CHECK(cmd->op != NULL, crm_log_xml_warn(msg, "NoOp"); free_async_command(cmd); return NULL);
	CRM_CHECK(cmd->client != NULL, crm_log_xml_warn(msg, "NoClient"));

	cmd->done_cb = st_child_done;
	cmd_list = g_list_append(cmd_list, cmd);
	return cmd;
	}

	static int
	get_action_limit(stonith_device_t * device)
	{
	const char *value = NULL;
	int action_limit = 1;

	value = g_hash_table_lookup(device->params, PCMK_STONITH_ACTION_LIMIT);
	if ((value == NULL)
	\|\| (pcmk__scan_min_int(value, &action_limit, INT_MIN) != pcmk_rc_ok)
	\|\| (action_limit == 0)) {
	action_limit = 1;
	}
	return action_limit;
	}

	static int
	get_active_cmds(stonith_device_t * device)
	{
	int counter = 0;
	GList *gIter = NULL;
	GList *gIterNext = NULL;

	CRM_CHECK(device != NULL, return 0);

	for (gIter = cmd_list; gIter != NULL; gIter = gIterNext) {
	async_command_t *cmd = gIter->data;

	gIterNext = gIter->next;

	if (cmd->active_on == device) {
	counter++;
	}
	}

	return counter;
	}

	static void
	fork_cb(int pid, void *user_data)
	{
	async_command_t cmd = (async_command_t ) user_data;
	stonith_device_t * device =
	/* in case of a retry we've done the move from
	activating_on to active_on already
	*/
	cmd->activating_on?cmd->activating_on:cmd->active_on;

	CRM_ASSERT(device);
	crm_debug("Operation '%s' [%d]%s%s using %s now running with %ds timeout",
	cmd->action, pid,
	((cmd->victim == NULL)? "" : " targeting "),
	((cmd->victim == NULL)? "" : cmd->victim),
	device->id, cmd->timeout);
	cmd->active_on = device;
	cmd->activating_on = NULL;
	}

	static int
	get_agent_metadata_cb(gpointer data) {
	stonith_device_t *device = data;
	guint period_ms;

	switch (get_agent_metadata(device->agent, &device->agent_metadata)) {
	case pcmk_rc_ok:
	if (device->agent_metadata) {
	read_action_metadata(device);
	stonith__device_parameter_flags(&(device->flags), device->id,
	device->agent_metadata);
	}
	return G_SOURCE_REMOVE;

	case EAGAIN:
	period_ms = pcmk__mainloop_timer_get_period(device->timer);
	if (period_ms < 160 * 1000) {
	mainloop_timer_set_period(device->timer, 2 * period_ms);
	}
	return G_SOURCE_CONTINUE;

	default:
	return G_SOURCE_REMOVE;
	}
	}

	/*!
	* \internal
	* \brief Call a command's action callback for an internal (not library) result
	*
	* \param[in] cmd Command to report result for
	* \param[in] execution_status Execution status to use for result
	* \param[in] exit_status Exit status to use for result
	* \param[in] exit_reason Exit reason to use for result
	*/
	static void
	report_internal_result(async_command_t *cmd, int exit_status,
	int execution_status, const char *exit_reason)
	{
	pcmk__action_result_t result = PCMK__UNKNOWN_RESULT;

	pcmk__set_result(&result, exit_status, execution_status, exit_reason);
	cmd->done_cb(0, &result, cmd);
	pcmk__reset_result(&result);
	}

	static gboolean
	stonith_device_execute(stonith_device_t * device)
	{
	int exec_rc = 0;
	const char *action_str = NULL;
	const char *host_arg = NULL;
	async_command_t *cmd = NULL;
	stonith_action_t *action = NULL;
	int active_cmds = 0;
	int action_limit = 0;
	GList *gIter = NULL;
	GList *gIterNext = NULL;

	CRM_CHECK(device != NULL, return FALSE);

	active_cmds = get_active_cmds(device);
	action_limit = get_action_limit(device);
	if (action_limit > -1 && active_cmds >= action_limit) {
	crm_trace("%s is over its action limit of %d (%u active action%s)",
	device->id, action_limit, active_cmds,
	pcmk__plural_s(active_cmds));
	return TRUE;
	}

	for (gIter = device->pending_ops; gIter != NULL; gIter = gIterNext) {
	async_command_t *pending_op = gIter->data;

	gIterNext = gIter->next;

	if (pending_op && pending_op->delay_id) {
	crm_trace("Operation '%s'%s%s using %s was asked to run too early, "
	"waiting for start delay of %ds",
	pending_op->action,
	((pending_op->victim == NULL)? "" : " targeting "),
	((pending_op->victim == NULL)? "" : pending_op->victim),
	device->id, pending_op->start_delay);
	continue;
	}

	device->pending_ops = g_list_remove_link(device->pending_ops, gIter);
	g_list_free_1(gIter);

	cmd = pending_op;
	break;
	}

	if (cmd == NULL) {
	crm_trace("No actions using %s are needed", device->id);
	return TRUE;
	}

	if (pcmk__str_any_of(device->agent, STONITH_WATCHDOG_AGENT,
	STONITH_WATCHDOG_AGENT_INTERNAL, NULL)) {
	if (pcmk__is_fencing_action(cmd->action)) {
	if (node_does_watchdog_fencing(stonith_our_uname)) {
	pcmk__panic(__func__);
	goto done;
	}
	} else {
	crm_info("Faking success for %s watchdog operation", cmd->action);
	report_internal_result(cmd, CRM_EX_OK, PCMK_EXEC_DONE, NULL);
	goto done;
	}
	}

	#if SUPPORT_CIBSECRETS
	exec_rc = pcmk__substitute_secrets(device->id, device->params);
	if (exec_rc != pcmk_rc_ok) {
	if (pcmk__str_eq(cmd->action, "stop", pcmk__str_casei)) {
	crm_info("Proceeding with stop operation for %s "
	"despite being unable to load CIB secrets (%s)",
	device->id, pcmk_rc_str(exec_rc));
	} else {
	crm_err("Considering %s unconfigured "
	"because unable to load CIB secrets: %s",
	device->id, pcmk_rc_str(exec_rc));
	report_internal_result(cmd, CRM_EX_ERROR, PCMK_EXEC_NO_SECRETS,
	"Failed to get CIB secrets");
	goto done;
	}
	}
	#endif

	action_str = cmd->action;
	if (pcmk__str_eq(cmd->action, "reboot", pcmk__str_casei)
	&& !pcmk_is_set(device->flags, st_device_supports_reboot)) {

	crm_notice("Remapping 'reboot' action%s%s using %s to 'off' "
	"because agent '%s' does not support reboot",
	((cmd->victim == NULL)? "" : " targeting "),
	((cmd->victim == NULL)? "" : cmd->victim),
	device->id, device->agent);
	action_str = "off";
	}

	if (pcmk_is_set(device->flags, st_device_supports_parameter_port)) {
	host_arg = "port";

	} else if (pcmk_is_set(device->flags, st_device_supports_parameter_plug)) {
	host_arg = "plug";
	}

	action = stonith_action_create(device->agent,
	action_str,
	cmd->victim,
	cmd->victim_nodeid,
	cmd->timeout, device->params,
	device->aliases, host_arg);

	/* for async exec, exec_rc is negative for early error exit
	otherwise handling of success/errors is done via callbacks */
	cmd->activating_on = device;
	exec_rc = stonith_action_execute_async(action, (void *)cmd,
	cmd->done_cb, fork_cb);
	if (exec_rc < 0) {
	cmd->activating_on = NULL;
	cmd->done_cb(0, stonith__action_result(action), cmd);
	stonith__destroy_action(action);
	}

	done:
	/* Device might get triggered to work by multiple fencing commands
	* simultaneously. Trigger the device again to make sure any
	* remaining concurrent commands get executed. */
	if (device->pending_ops) {
	mainloop_set_trigger(device->work);
	}
	return TRUE;
	}

	static gboolean
	stonith_device_dispatch(gpointer user_data)
	{
	return stonith_device_execute(user_data);
	}

	static gboolean
	start_delay_helper(gpointer data)
	{
	async_command_t *cmd = data;
	stonith_device_t *device = NULL;

	cmd->delay_id = 0;
	device = cmd->device ? g_hash_table_lookup(device_list, cmd->device) : NULL;

	if (device) {
	mainloop_set_trigger(device->work);
	}

	return FALSE;
	}

	static void
	schedule_stonith_command(async_command_t * cmd, stonith_device_t * device)
	{
	int delay_max = 0;
	int delay_base = 0;
	int requested_delay = cmd->start_delay;

	CRM_CHECK(cmd != NULL, return);
	CRM_CHECK(device != NULL, return);

	if (cmd->device) {
	free(cmd->device);
	}

	if (device->include_nodeid && cmd->victim) {
	crm_node_t *node = crm_get_peer(0, cmd->victim);

	cmd->victim_nodeid = node->id;
	}

	cmd->device = strdup(device->id);
	cmd->timeout = get_action_timeout(device, cmd->action, cmd->default_timeout);

	if (cmd->remote_op_id) {
	crm_debug("Scheduling '%s' action%s%s using %s for remote peer %s "
	"with op id %.8s and timeout %ds",
	cmd->action,
	cmd->victim ? " targeting " : "", cmd->victim ? cmd->victim : "",
	device->id, cmd->origin, cmd->remote_op_id, cmd->timeout);
	} else {
	crm_debug("Scheduling '%s' action%s%s using %s for %s with timeout %ds",
	cmd->action,
	cmd->victim ? " targeting " : "", cmd->victim ? cmd->victim : "",
	device->id, cmd->client, cmd->timeout);
	}

	device->pending_ops = g_list_append(device->pending_ops, cmd);
	mainloop_set_trigger(device->work);

	// Value -1 means disable any static/random fencing delays
	if (requested_delay < 0) {
	return;
	}

	delay_max = get_action_delay_max(device, cmd->action);
	delay_base = get_action_delay_base(device, cmd->action, cmd->victim);
	if (delay_max == 0) {
	delay_max = delay_base;
	}
	if (delay_max < delay_base) {
	crm_warn(PCMK_STONITH_DELAY_BASE " (%ds) is larger than "
	PCMK_STONITH_DELAY_MAX " (%ds) for %s using %s "
	"(limiting to maximum delay)",
	delay_base, delay_max, cmd->action, device->id);
	delay_base = delay_max;
	}
	if (delay_max > 0) {
	// coverity[dont_call] We're not using rand() for security
	cmd->start_delay +=
	((delay_max != delay_base)?(rand() % (delay_max - delay_base)):0)
	+ delay_base;
	}

	if (cmd->start_delay > 0) {
	crm_notice("Delaying '%s' action%s%s using %s for %ds " CRM_XS
	" timeout=%ds requested_delay=%ds base=%ds max=%ds",
	cmd->action,
	cmd->victim ? " targeting " : "", cmd->victim ? cmd->victim : "",
	device->id, cmd->start_delay, cmd->timeout,
	requested_delay, delay_base, delay_max);
	cmd->delay_id =
	g_timeout_add_seconds(cmd->start_delay, start_delay_helper, cmd);
	}
	}

	static void
	free_device(gpointer data)
	{
	GList *gIter = NULL;
	stonith_device_t *device = data;

	g_hash_table_destroy(device->params);
	g_hash_table_destroy(device->aliases);

	for (gIter = device->pending_ops; gIter != NULL; gIter = gIter->next) {
	async_command_t *cmd = gIter->data;

	crm_warn("Removal of device '%s' purged operation '%s'", device->id, cmd->action);
	report_internal_result(cmd, CRM_EX_ERROR, PCMK_EXEC_NO_FENCE_DEVICE,
	"Device was removed before action could be executed");
	}
	g_list_free(device->pending_ops);

	g_list_free_full(device->targets, free);

	if (device->timer) {
	mainloop_timer_stop(device->timer);
	mainloop_timer_del(device->timer);
	}

	mainloop_destroy_trigger(device->work);

	free_xml(device->agent_metadata);
	free(device->namespace);
	free(device->on_target_actions);
	free(device->agent);
	free(device->id);
	free(device);
	}

	void free_device_list(void)
	{
	if (device_list != NULL) {
	g_hash_table_destroy(device_list);
	device_list = NULL;
	}
	}

	void
	init_device_list(void)
	{
	if (device_list == NULL) {
	device_list = pcmk__strkey_table(NULL, free_device);
	}
	}

	static GHashTable *
	build_port_aliases(const char hostmap, GList * targets)
	{
	char *name = NULL;
	int last = 0, lpc = 0, max = 0, added = 0;
	GHashTable *aliases = pcmk__strikey_table(free, free);

	if (hostmap == NULL) {
	return aliases;
	}

	max = strlen(hostmap);
	for (; lpc <= max; lpc++) {
	switch (hostmap[lpc]) {
	/* Skip escaped chars */
	case '\\':
	lpc++;
	break;

	/* Assignment chars */
	case '=':
	case ':':
	if (lpc > last) {
	free(name);
	name = calloc(1, 1 + lpc - last);
	memcpy(name, hostmap + last, lpc - last);
	}
	last = lpc + 1;
	break;

	/* Delimeter chars */
	/* case ',': Potentially used to specify multiple ports */
	case 0:
	case ';':
	case ' ':
	case '\t':
	if (name) {
	char *value = NULL;
	int k = 0;

	value = calloc(1, 1 + lpc - last);
	memcpy(value, hostmap + last, lpc - last);

	for (int i = 0; value[i] != '\0'; i++) {
	if (value[i] != '\\') {
	value[k++] = value[i];
	}
	}
	value[k] = '\0';

	crm_debug("Adding alias '%s'='%s'", name, value);
	g_hash_table_replace(aliases, name, value);
	if (targets) {
	targets = g_list_append(targets, strdup(value));
	}
	value = NULL;
	name = NULL;
	added++;

	} else if (lpc > last) {
	crm_debug("Parse error at offset %d near '%s'", lpc - last, hostmap + last);
	}

	last = lpc + 1;
	break;
	}

	if (hostmap[lpc] == 0) {
	break;
	}
	}

	if (added == 0) {
	crm_info("No host mappings detected in '%s'", hostmap);
	}

	free(name);
	return aliases;
	}

	GHashTable *metadata_cache = NULL;

	void
	free_metadata_cache(void) {
	if (metadata_cache != NULL) {
	g_hash_table_destroy(metadata_cache);
	metadata_cache = NULL;
	}
	}

	static void
	init_metadata_cache(void) {
	if (metadata_cache == NULL) {
	metadata_cache = pcmk__strkey_table(free, free);
	}
	}

	int
	get_agent_metadata(const char agent, xmlNode * metadata)
	{
	char *buffer = NULL;

	if (metadata == NULL) {
	return EINVAL;
	}
	*metadata = NULL;
	if (pcmk__str_eq(agent, STONITH_WATCHDOG_AGENT_INTERNAL, pcmk__str_none)) {
	return pcmk_rc_ok;
	}
	init_metadata_cache();
	buffer = g_hash_table_lookup(metadata_cache, agent);
	if (buffer == NULL) {
	stonith_t *st = stonith_api_new();
	int rc;

	if (st == NULL) {
	crm_warn("Could not get agent meta-data: "
	"API memory allocation failed");
	return EAGAIN;
	}
	rc = st->cmds->metadata(st, st_opt_sync_call, agent,
	NULL, &buffer, 10);
	stonith_api_delete(st);
	if (rc \|\| !buffer) {
	crm_err("Could not retrieve metadata for fencing agent %s", agent);
	return EAGAIN;
	}
	g_hash_table_replace(metadata_cache, strdup(agent), buffer);
	}

	*metadata = string2xml(buffer);
	return pcmk_rc_ok;
	}

	static gboolean
	is_nodeid_required(xmlNode * xml)
	{
	xmlXPathObjectPtr xpath = NULL;

	if (stand_alone) {
	return FALSE;
	}

	if (!xml) {
	return FALSE;
	}

	xpath = xpath_search(xml, "//parameter[@name='nodeid']");
	if (numXpathResults(xpath) <= 0) {
	freeXpathObject(xpath);
	return FALSE;
	}

	freeXpathObject(xpath);
	return TRUE;
	}

	#define MAX_ACTION_LEN 256

	static char *
	add_action(char actions, const char action)
	{
	int offset = 0;

	if (actions == NULL) {
	actions = calloc(1, MAX_ACTION_LEN);
	} else {
	offset = strlen(actions);
	}

	if (offset > 0) {
	offset += snprintf(actions+offset, MAX_ACTION_LEN - offset, " ");
	}
	offset += snprintf(actions+offset, MAX_ACTION_LEN - offset, "%s", action);

	return actions;
	}

	static void
	read_action_metadata(stonith_device_t *device)
	{
	xmlXPathObjectPtr xpath = NULL;
	int max = 0;
	int lpc = 0;

	if (device->agent_metadata == NULL) {
	return;
	}

	xpath = xpath_search(device->agent_metadata, "//action");
	max = numXpathResults(xpath);

	if (max <= 0) {
	freeXpathObject(xpath);
	return;
	}

	for (lpc = 0; lpc < max; lpc++) {
	const char *action = NULL;
	xmlNode *match = getXpathResult(xpath, lpc);

	CRM_LOG_ASSERT(match != NULL);
	if(match == NULL) { continue; };

	action = crm_element_value(match, "name");

	if(pcmk__str_eq(action, "list", pcmk__str_casei)) {
	stonith__set_device_flags(device->flags, device->id,
	st_device_supports_list);
	} else if(pcmk__str_eq(action, "status", pcmk__str_casei)) {
	stonith__set_device_flags(device->flags, device->id,
	st_device_supports_status);
	} else if(pcmk__str_eq(action, "reboot", pcmk__str_casei)) {
	stonith__set_device_flags(device->flags, device->id,
	st_device_supports_reboot);
	} else if (pcmk__str_eq(action, "on", pcmk__str_casei)) {
	/* "automatic" means the cluster will unfence node when it joins */
	/* "required" is a deprecated synonym for "automatic" */
	if (pcmk__xe_attr_is_true(match, "automatic") \|\| pcmk__xe_attr_is_true(match, "required")) {
	device->automatic_unfencing = TRUE;
	}
	}

	if (action && pcmk__xe_attr_is_true(match, "on_target")) {
	device->on_target_actions = add_action(device->on_target_actions, action);
	}
	}

	freeXpathObject(xpath);
	}

	/*!
	* \internal
	* \brief Set a pcmk_*_action parameter if not already set
	*
	* \param[in,out] params Device parameters
	* \param[in] action Name of action
	* \param[in] value Value to use if action is not already set
	*/
	static void
	map_action(GHashTable params, const char action, const char *value)
	{
	char *key = crm_strdup_printf("pcmk_%s_action", action);

	if (g_hash_table_lookup(params, key)) {
	crm_warn("Ignoring %s='%s', see %s instead",
	STONITH_ATTR_ACTION_OP, value, key);
	free(key);
	} else {
	crm_warn("Mapping %s='%s' to %s='%s'",
	STONITH_ATTR_ACTION_OP, value, key, value);
	g_hash_table_insert(params, key, strdup(value));
	}
	}

	/*!
	* \internal
	* \brief Create device parameter table from XML
	*
	* \param[in] name Device name (used for logging only)
	* \param[in,out] params Device parameters
	*/
	static GHashTable *
	xml2device_params(const char name, xmlNode dev)
	{
	GHashTable *params = xml2list(dev);
	const char *value;

	/* Action should never be specified in the device configuration,
	* but we support it for users who are familiar with other software
	* that worked that way.
	*/
	value = g_hash_table_lookup(params, STONITH_ATTR_ACTION_OP);
	if (value != NULL) {
	crm_warn("%s has '%s' parameter, which should never be specified in configuration",
	name, STONITH_ATTR_ACTION_OP);

	if (*value == '\0') {
	crm_warn("Ignoring empty '%s' parameter", STONITH_ATTR_ACTION_OP);

	} else if (strcmp(value, "reboot") == 0) {
	crm_warn("Ignoring %s='reboot' (see stonith-action cluster property instead)",
	STONITH_ATTR_ACTION_OP);

	} else if (strcmp(value, "off") == 0) {
	map_action(params, "reboot", value);

	} else {
	map_action(params, "off", value);
	map_action(params, "reboot", value);
	}

	g_hash_table_remove(params, STONITH_ATTR_ACTION_OP);
	}

	return params;
	}

	static const char *
	target_list_type(stonith_device_t * dev)
	{
	const char *check_type = NULL;

	check_type = g_hash_table_lookup(dev->params, PCMK_STONITH_HOST_CHECK);

	if (check_type == NULL) {

	if (g_hash_table_lookup(dev->params, PCMK_STONITH_HOST_LIST)) {
	check_type = "static-list";
	} else if (g_hash_table_lookup(dev->params, PCMK_STONITH_HOST_MAP)) {
	check_type = "static-list";
	} else if (pcmk_is_set(dev->flags, st_device_supports_list)) {
	check_type = "dynamic-list";
	} else if (pcmk_is_set(dev->flags, st_device_supports_status)) {
	check_type = "status";
	} else {
	check_type = "none";
	}
	}

	return check_type;
	}

	static stonith_device_t *
	build_device_from_xml(xmlNode * msg)
	{
	const char *value;
	xmlNode *dev = get_xpath_object("//" F_STONITH_DEVICE, msg, LOG_ERR);
	stonith_device_t *device = NULL;
	char *agent = crm_element_value_copy(dev, "agent");

	CRM_CHECK(agent != NULL, return device);

	device = calloc(1, sizeof(stonith_device_t));

	CRM_CHECK(device != NULL, {free(agent); return device;});

	device->id = crm_element_value_copy(dev, XML_ATTR_ID);
	device->agent = agent;
	device->namespace = crm_element_value_copy(dev, "namespace");
	device->params = xml2device_params(device->id, dev);

	value = g_hash_table_lookup(device->params, PCMK_STONITH_HOST_LIST);
	if (value) {
	device->targets = stonith__parse_targets(value);
	}

	value = g_hash_table_lookup(device->params, PCMK_STONITH_HOST_MAP);
	device->aliases = build_port_aliases(value, &(device->targets));

	value = target_list_type(device);
	if (!pcmk__str_eq(value, "static-list", pcmk__str_casei) && device->targets) {
	/* Other than "static-list", dev-> targets is unnecessary. */
	g_list_free_full(device->targets, free);
	device->targets = NULL;
	}
	switch (get_agent_metadata(device->agent, &device->agent_metadata)) {
	case pcmk_rc_ok:
	if (device->agent_metadata) {
	read_action_metadata(device);
	stonith__device_parameter_flags(&(device->flags), device->id,
	device->agent_metadata);
	}
	break;

	case EAGAIN:
	if (device->timer == NULL) {
	device->timer = mainloop_timer_add("get_agent_metadata", 10 * 1000,
	TRUE, get_agent_metadata_cb, device);
	}
	if (!mainloop_timer_running(device->timer)) {
	mainloop_timer_start(device->timer);
	}
	break;

	default:
	break;
	}

	value = g_hash_table_lookup(device->params, "nodeid");
	if (!value) {
	device->include_nodeid = is_nodeid_required(device->agent_metadata);
	}

	value = crm_element_value(dev, "rsc_provides");
	if (pcmk__str_eq(value, "unfencing", pcmk__str_casei)) {
	device->automatic_unfencing = TRUE;
	}

	if (is_action_required("on", device)) {
	crm_info("Fencing device '%s' requires unfencing", device->id);
	}

	if (device->on_target_actions) {
	crm_info("Fencing device '%s' requires actions (%s) to be executed "
	"on target", device->id, device->on_target_actions);
	}

	device->work = mainloop_add_trigger(G_PRIORITY_HIGH, stonith_device_dispatch, device);
	/* TODO: Hook up priority */

	return device;
	}

	static void
	schedule_internal_command(const char *origin,
	stonith_device_t * device,
	const char *action,
	const char *victim,
	int timeout,
	void *internal_user_data,
	void (*done_cb) (int pid,
	const pcmk__action_result_t *result,
	void *user_data))
	{
	async_command_t *cmd = NULL;

	cmd = calloc(1, sizeof(async_command_t));

	cmd->id = -1;
	cmd->default_timeout = timeout ? timeout : 60;
	cmd->timeout = cmd->default_timeout;
	cmd->action = strdup(action);
	cmd->victim = victim ? strdup(victim) : NULL;
	cmd->device = strdup(device->id);
	cmd->origin = strdup(origin);
	cmd->client = strdup(crm_system_name);
	cmd->client_name = strdup(crm_system_name);

	cmd->internal_user_data = internal_user_data;
	cmd->done_cb = done_cb; /* cmd, not internal_user_data, is passed to 'done_cb' as the userdata */

	schedule_stonith_command(cmd, device);
	}

	// Fence agent status commands use custom exit status codes
	enum fence_status_code {
	fence_status_invalid = -1,
	fence_status_active = 0,
	fence_status_unknown = 1,
	fence_status_inactive = 2,
	};

	static void
	status_search_cb(int pid, const pcmk__action_result_t result, void user_data)
	{
	async_command_t *cmd = user_data;
	struct device_search_s *search = cmd->internal_user_data;
	stonith_device_t *dev = cmd->device ? g_hash_table_lookup(device_list, cmd->device) : NULL;
	gboolean can = FALSE;

	free_async_command(cmd);

	if (!dev) {
	search_devices_record_result(search, NULL, FALSE);
	return;
	}

	mainloop_set_trigger(dev->work);

	if (result->execution_status != PCMK_EXEC_DONE) {
	crm_warn("Assuming %s cannot fence %s "
	"because status could not be executed: %s%s%s%s",
	dev->id, search->host,
	pcmk_exec_status_str(result->execution_status),
	((result->exit_reason == NULL)? "" : " ("),
	((result->exit_reason == NULL)? "" : result->exit_reason),
	((result->exit_reason == NULL)? "" : ")"));
	search_devices_record_result(search, dev->id, FALSE);
	return;
	}

	switch (result->exit_status) {
	case fence_status_unknown:
	crm_trace("%s reported it cannot fence %s", dev->id, search->host);
	break;

	case fence_status_active:
	case fence_status_inactive:
	crm_trace("%s reported it can fence %s", dev->id, search->host);
	can = TRUE;
	break;

	default:
	crm_warn("Assuming %s cannot fence %s "
	"(status returned unknown code %d)",
	dev->id, search->host, result->exit_status);
	break;
	}
	search_devices_record_result(search, dev->id, can);
	}

	static void
	dynamic_list_search_cb(int pid, const pcmk__action_result_t *result,
	void *user_data)
	{
	async_command_t *cmd = user_data;
	struct device_search_s *search = cmd->internal_user_data;
	stonith_device_t *dev = cmd->device ? g_hash_table_lookup(device_list, cmd->device) : NULL;
	gboolean can_fence = FALSE;

	free_async_command(cmd);

	/* Host/alias must be in the list output to be eligible to be fenced
	*
	* Will cause problems if down'd nodes aren't listed or (for virtual nodes)
	* if the guest is still listed despite being moved to another machine
	*/
	if (!dev) {
	search_devices_record_result(search, NULL, FALSE);
	return;
	}

	mainloop_set_trigger(dev->work);

	if (pcmk__result_ok(result)) {
	crm_info("Refreshing target list for %s", dev->id);
	g_list_free_full(dev->targets, free);
	dev->targets = stonith__parse_targets(result->action_stdout);
	dev->targets_age = time(NULL);

	} else if (dev->targets != NULL) {
	if (result->execution_status == PCMK_EXEC_DONE) {
	crm_info("Reusing most recent target list for %s "
	"because list returned error code %d",
	dev->id, result->exit_status);
	} else {
	crm_info("Reusing most recent target list for %s "
	"because list could not be executed: %s%s%s%s",
	dev->id, pcmk_exec_status_str(result->execution_status),
	((result->exit_reason == NULL)? "" : " ("),
	((result->exit_reason == NULL)? "" : result->exit_reason),
	((result->exit_reason == NULL)? "" : ")"));
	}

	} else { // We have never successfully executed list
	if (result->execution_status == PCMK_EXEC_DONE) {
	crm_warn("Assuming %s cannot fence %s "
	"because list returned error code %d",
	dev->id, search->host, result->exit_status);
	} else {
	crm_warn("Assuming %s cannot fence %s "
	"because list could not be executed: %s%s%s%s",
	dev->id, search->host,
	pcmk_exec_status_str(result->execution_status),
	((result->exit_reason == NULL)? "" : " ("),
	((result->exit_reason == NULL)? "" : result->exit_reason),
	((result->exit_reason == NULL)? "" : ")"));
	}

	/* Fall back to pcmk_host_check="status" if the user didn't explicitly
	* specify "dynamic-list".
	*/
	if (g_hash_table_lookup(dev->params, PCMK_STONITH_HOST_CHECK) == NULL) {
	crm_notice("Switching to pcmk_host_check='status' for %s", dev->id);
	g_hash_table_replace(dev->params, strdup(PCMK_STONITH_HOST_CHECK),
	strdup("status"));
	}
	}

	if (dev->targets) {
	const char *alias = g_hash_table_lookup(dev->aliases, search->host);

	if (!alias) {
	alias = search->host;
	}
	if (pcmk__str_in_list(alias, dev->targets, pcmk__str_casei)) {
	can_fence = TRUE;
	}
	}
	search_devices_record_result(search, dev->id, can_fence);
	}

	/*!
	* \internal
	* \brief Returns true if any key in first is not in second or second has a different value for key
	*/
	static int
	device_params_diff(GHashTable first, GHashTable second) {
	char *key = NULL;
	char *value = NULL;
	GHashTableIter gIter;

	g_hash_table_iter_init(&gIter, first);
	while (g_hash_table_iter_next(&gIter, (void )&key, (void )&value)) {

	if(strstr(key, "CRM_meta") == key) {
	continue;
	} else if(strcmp(key, "crm_feature_set") == 0) {
	continue;
	} else {
	char *other_value = g_hash_table_lookup(second, key);

	if (!other_value \|\| !pcmk__str_eq(other_value, value, pcmk__str_casei)) {
	crm_trace("Different value for %s: %s != %s", key, other_value, value);
	return 1;
	}
	}
	}

	return 0;
	}

	/*!
	* \internal
	* \brief Checks to see if an identical device already exists in the device_list
	*/
	static stonith_device_t *
	device_has_duplicate(stonith_device_t * device)
	{
	stonith_device_t *dup = g_hash_table_lookup(device_list, device->id);

	if (!dup) {
	crm_trace("No match for %s", device->id);
	return NULL;

	} else if (!pcmk__str_eq(dup->agent, device->agent, pcmk__str_casei)) {
	crm_trace("Different agent: %s != %s", dup->agent, device->agent);
	return NULL;
	}

	/* Use calculate_operation_digest() here? */
	if (device_params_diff(device->params, dup->params) \|\|
	device_params_diff(dup->params, device->params)) {
	return NULL;
	}

	crm_trace("Match");
	return dup;
	}

	int
	stonith_device_register(xmlNode * msg, const char **desc, gboolean from_cib)
	{
	stonith_device_t *dup = NULL;
	stonith_device_t *device = build_device_from_xml(msg);
	guint ndevices = 0;
	int rv = pcmk_ok;

	CRM_CHECK(device != NULL, return -ENOMEM);

	/* do we have a watchdog-device? */
	if (pcmk__str_eq(device->id, STONITH_WATCHDOG_ID, pcmk__str_none) \|\|
	pcmk__str_any_of(device->agent, STONITH_WATCHDOG_AGENT,
	STONITH_WATCHDOG_AGENT_INTERNAL, NULL)) do {
	if (stonith_watchdog_timeout_ms <= 0) {
	crm_err("Ignoring watchdog fence device without "
	"stonith-watchdog-timeout set.");
	rv = -ENODEV;
	/* fall through to cleanup & return */
	} else if (!pcmk__str_any_of(device->agent, STONITH_WATCHDOG_AGENT,
	STONITH_WATCHDOG_AGENT_INTERNAL, NULL)) {
	crm_err("Ignoring watchdog fence device with unknown "
	"agent '%s' unequal '" STONITH_WATCHDOG_AGENT "'.",
	device->agent?device->agent:"");
	rv = -ENODEV;
	/* fall through to cleanup & return */
	} else if (!pcmk__str_eq(device->id, STONITH_WATCHDOG_ID,
	pcmk__str_none)) {
	crm_err("Ignoring watchdog fence device "
	"named %s !='"STONITH_WATCHDOG_ID"'.",
	device->id?device->id:"");
	rv = -ENODEV;
	/* fall through to cleanup & return */
	} else {
	if (pcmk__str_eq(device->agent, STONITH_WATCHDOG_AGENT,
	pcmk__str_none)) {
	/* this either has an empty list or the targets
	configured for watchdog-fencing
	*/
	g_list_free_full(stonith_watchdog_targets, free);
	stonith_watchdog_targets = device->targets;
	device->targets = NULL;
	}
	if (node_does_watchdog_fencing(stonith_our_uname)) {
	g_list_free_full(device->targets, free);
	device->targets = stonith__parse_targets(stonith_our_uname);
	g_hash_table_replace(device->params,
	strdup(PCMK_STONITH_HOST_LIST),
	strdup(stonith_our_uname));
	/* proceed as with any other stonith-device */
	break;
	}

	crm_debug("Skip registration of watchdog fence device on node not in host-list.");
	/* cleanup and fall through to more cleanup and return */
	device->targets = NULL;
	stonith_device_remove(device->id, from_cib);
	}
	free_device(device);
	return rv;
	} while (0);

	dup = device_has_duplicate(device);
	if (dup) {
	ndevices = g_hash_table_size(device_list);
	crm_debug("Device '%s' already in device list (%d active device%s)",
	device->id, ndevices, pcmk__plural_s(ndevices));
	free_device(device);
	device = dup;
	dup = g_hash_table_lookup(device_list, device->id);
	dup->dirty = FALSE;

	} else {
	stonith_device_t *old = g_hash_table_lookup(device_list, device->id);

	if (from_cib && old && old->api_registered) {
	/* If the cib is writing over an entry that is shared with a stonith client,
	* copy any pending ops that currently exist on the old entry to the new one.
	* Otherwise the pending ops will be reported as failures
	*/
	crm_info("Overwriting existing entry for %s from CIB", device->id);
	device->pending_ops = old->pending_ops;
	device->api_registered = TRUE;
	old->pending_ops = NULL;
	if (device->pending_ops) {
	mainloop_set_trigger(device->work);
	}
	}
	g_hash_table_replace(device_list, device->id, device);

	ndevices = g_hash_table_size(device_list);
	crm_notice("Added '%s' to device list (%d active device%s)",
	device->id, ndevices, pcmk__plural_s(ndevices));
	}
	if (desc) {
	*desc = device->id;
	}

	if (from_cib) {
	device->cib_registered = TRUE;
	} else {
	device->api_registered = TRUE;
	}

	return pcmk_ok;
	}

	int
	stonith_device_remove(const char *id, gboolean from_cib)
	{
	stonith_device_t *device = g_hash_table_lookup(device_list, id);
	guint ndevices = 0;

	if (!device) {
	ndevices = g_hash_table_size(device_list);
	crm_info("Device '%s' not found (%d active device%s)",
	id, ndevices, pcmk__plural_s(ndevices));
	return pcmk_ok;
	}

	if (from_cib) {
	device->cib_registered = FALSE;
	} else {
	device->verified = FALSE;
	device->api_registered = FALSE;
	}

	if (!device->cib_registered && !device->api_registered) {
	g_hash_table_remove(device_list, id);
	ndevices = g_hash_table_size(device_list);
	crm_info("Removed '%s' from device list (%d active device%s)",
	id, ndevices, pcmk__plural_s(ndevices));
	} else {
	crm_trace("Not removing '%s' from device list (%d active) because "
	"still registered via:%s%s",
	id, g_hash_table_size(device_list),
	(device->cib_registered? " cib" : ""),
	(device->api_registered? " api" : ""));
	}
	return pcmk_ok;
	}

	/*!
	* \internal
	* \brief Return the number of stonith levels registered for a node
	*
	* \param[in] tp Node's topology table entry
	*
	* \return Number of non-NULL levels in topology entry
	* \note This function is used only for log messages.
	*/
	static int
	count_active_levels(stonith_topology_t * tp)
	{
	int lpc = 0;
	int count = 0;

	for (lpc = 0; lpc < ST_LEVEL_MAX; lpc++) {
	if (tp->levels[lpc] != NULL) {
	count++;
	}
	}
	return count;
	}

	static void
	free_topology_entry(gpointer data)
	{
	stonith_topology_t *tp = data;

	int lpc = 0;

	for (lpc = 0; lpc < ST_LEVEL_MAX; lpc++) {
	if (tp->levels[lpc] != NULL) {
	g_list_free_full(tp->levels[lpc], free);
	}
	}
	free(tp->target);
	free(tp->target_value);
	free(tp->target_pattern);
	free(tp->target_attribute);
	free(tp);
	}

	void
	free_topology_list(void)
	{
	if (topology != NULL) {
	g_hash_table_destroy(topology);
	topology = NULL;
	}
	}

	void
	init_topology_list(void)
	{
	if (topology == NULL) {
	topology = pcmk__strkey_table(NULL, free_topology_entry);
	}
	}

	char stonith_level_key(xmlNode level, int mode)
	{
	if(mode == -1) {
	mode = stonith_level_kind(level);
	}

	switch(mode) {
	case 0:
	return crm_element_value_copy(level, XML_ATTR_STONITH_TARGET);
	case 1:
	return crm_element_value_copy(level, XML_ATTR_STONITH_TARGET_PATTERN);
	case 2:
	{
	const char *name = crm_element_value(level, XML_ATTR_STONITH_TARGET_ATTRIBUTE);
	const char *value = crm_element_value(level, XML_ATTR_STONITH_TARGET_VALUE);

	if(name && value) {
	return crm_strdup_printf("%s=%s", name, value);
	}
	}
	default:
	return crm_strdup_printf("Unknown-%d-%s", mode, ID(level));
	}
	}

	int stonith_level_kind(xmlNode * level)
	{
	int mode = 0;
	const char *target = crm_element_value(level, XML_ATTR_STONITH_TARGET);

	if(target == NULL) {
	mode++;
	target = crm_element_value(level, XML_ATTR_STONITH_TARGET_PATTERN);
	}

	if(stand_alone == FALSE && target == NULL) {

	mode++;

	if(crm_element_value(level, XML_ATTR_STONITH_TARGET_ATTRIBUTE) == NULL) {
	mode++;

	} else if(crm_element_value(level, XML_ATTR_STONITH_TARGET_VALUE) == NULL) {
	mode++;
	}
	}

	return mode;
	}

	static stonith_key_value_t *
	parse_device_list(const char *devices)
	{
	int lpc = 0;
	int max = 0;
	int last = 0;
	stonith_key_value_t *output = NULL;

	if (devices == NULL) {
	return output;
	}

	max = strlen(devices);
	for (lpc = 0; lpc <= max; lpc++) {
	if (devices[lpc] == ',' \|\| devices[lpc] == 0) {
	char *line = strndup(devices + last, lpc - last);

	output = stonith_key_value_add(output, NULL, line);
	free(line);

	last = lpc + 1;
	}
	}

	return output;
	}

	/*!
	* \internal
	* \brief Register a STONITH level for a target
	*
	* Given an XML request specifying the target name, level index, and device IDs
	* for the level, this will create an entry for the target in the global topology
	* table if one does not already exist, then append the specified device IDs to
	* the entry's device list for the specified level.
	*
	* \param[in] msg XML request for STONITH level registration
	* \param[out] desc If not NULL, will be set to string representation ("TARGET[LEVEL]")
	*
	* \return pcmk_ok on success, -EINVAL if XML does not specify valid level index
	*/
	int
	stonith_level_register(xmlNode msg, char *desc)
	{
	int id = 0;
	xmlNode *level;
	int mode;
	char *target;

	stonith_topology_t *tp;
	stonith_key_value_t *dIter = NULL;
	stonith_key_value_t *devices = NULL;

	/* Allow the XML here to point to the level tag directly, or wrapped in
	* another tag. If directly, don't search by xpath, because it might give
	* multiple hits (e.g. if the XML is the CIB).
	*/
	if (pcmk__str_eq(TYPE(msg), XML_TAG_FENCING_LEVEL, pcmk__str_casei)) {
	level = msg;
	} else {
	level = get_xpath_object("//" XML_TAG_FENCING_LEVEL, msg, LOG_ERR);
	}
	CRM_CHECK(level != NULL, return -EINVAL);

	mode = stonith_level_kind(level);
	target = stonith_level_key(level, mode);
	crm_element_value_int(level, XML_ATTR_STONITH_INDEX, &id);

	if (desc) {
	*desc = crm_strdup_printf("%s[%d]", target, id);
	}

	/* Sanity-check arguments */
	if (mode >= 3 \|\| (id <= 0) \|\| (id >= ST_LEVEL_MAX)) {
	crm_trace("Could not add %s[%d] (%d) to the topology (%d active entries)", target, id, mode, g_hash_table_size(topology));
	free(target);
	crm_log_xml_err(level, "Bad topology");
	return -EINVAL;
	}

	/* Find or create topology table entry */
	tp = g_hash_table_lookup(topology, target);
	if (tp == NULL) {
	tp = calloc(1, sizeof(stonith_topology_t));
	tp->kind = mode;
	tp->target = target;
	tp->target_value = crm_element_value_copy(level, XML_ATTR_STONITH_TARGET_VALUE);
	tp->target_pattern = crm_element_value_copy(level, XML_ATTR_STONITH_TARGET_PATTERN);
	tp->target_attribute = crm_element_value_copy(level, XML_ATTR_STONITH_TARGET_ATTRIBUTE);

	g_hash_table_replace(topology, tp->target, tp);
	crm_trace("Added %s (%d) to the topology (%d active entries)",
	target, mode, g_hash_table_size(topology));
	} else {
	free(target);
	}

	if (tp->levels[id] != NULL) {
	crm_info("Adding to the existing %s[%d] topology entry",
	tp->target, id);
	}

	devices = parse_device_list(crm_element_value(level, XML_ATTR_STONITH_DEVICES));
	for (dIter = devices; dIter; dIter = dIter->next) {
	const char *device = dIter->value;

	crm_trace("Adding device '%s' for %s[%d]", device, tp->target, id);
	tp->levels[id] = g_list_append(tp->levels[id], strdup(device));
	}
	stonith_key_value_freeall(devices, 1, 1);

	{
	int nlevels = count_active_levels(tp);

	crm_info("Target %s has %d active fencing level%s",
	tp->target, nlevels, pcmk__plural_s(nlevels));
	}
	return pcmk_ok;
	}

	int
	stonith_level_remove(xmlNode msg, char *desc)
	{
	int id = 0;
	stonith_topology_t *tp;
	char *target;

	/* Unlike additions, removal requests should always have one level tag */
	xmlNode *level = get_xpath_object("//" XML_TAG_FENCING_LEVEL, msg, LOG_ERR);

	CRM_CHECK(level != NULL, return -EINVAL);

	target = stonith_level_key(level, -1);
	crm_element_value_int(level, XML_ATTR_STONITH_INDEX, &id);
	if (desc) {
	*desc = crm_strdup_printf("%s[%d]", target, id);
	}

	/* Sanity-check arguments */
	if (id >= ST_LEVEL_MAX) {
	free(target);
	return -EINVAL;
	}

	tp = g_hash_table_lookup(topology, target);
	if (tp == NULL) {
	guint nentries = g_hash_table_size(topology);

	crm_info("No fencing topology found for %s (%d active %s)",
	target, nentries,
	pcmk__plural_alt(nentries, "entry", "entries"));

	} else if (id == 0 && g_hash_table_remove(topology, target)) {
	guint nentries = g_hash_table_size(topology);

	crm_info("Removed all fencing topology entries related to %s "
	"(%d active %s remaining)", target, nentries,
	pcmk__plural_alt(nentries, "entry", "entries"));

	} else if (id > 0 && tp->levels[id] != NULL) {
	guint nlevels;

	g_list_free_full(tp->levels[id], free);
	tp->levels[id] = NULL;

	nlevels = count_active_levels(tp);
	crm_info("Removed level %d from fencing topology for %s "
	"(%d active level%s remaining)",
	id, target, nlevels, pcmk__plural_s(nlevels));
	}

	free(target);
	return pcmk_ok;
	}

	/*!
	* \internal
	* \brief Schedule an (asynchronous) action directly on a stonith device
	*
	* Handle a STONITH_OP_EXEC API message by scheduling a requested agent action
	* directly on a specified device. Only list, monitor, and status actions are
	* expected to use this call, though it should work with any agent command.
	*
	* \param[in] msg API message XML with desired action
	* \param[out] output Unused
	*
	* \return -EINPROGRESS on success, -errno otherwise
	* \note If the action is monitor, the device must be registered via the API
	* (CIB registration is not sufficient), because monitor should not be
	* possible unless the device is "started" (API registered).
	*/

	static char *
	list_to_string(GList list, const char delim, gboolean terminate_with_delim)
	{
	int max = g_list_length(list);
	size_t delim_len = delim?strlen(delim):0;
	size_t alloc_size = 1 + (max?((max-1+(terminate_with_delim?1:0))*delim_len):0);
	char *rv;
	GList *gIter;

	for (gIter = list; gIter != NULL; gIter = gIter->next) {
	const char value = (const char ) gIter->data;

	alloc_size += strlen(value);
	}
	rv = calloc(alloc_size, sizeof(char));
	if (rv) {
	char *pos = rv;
	const char *lead_delim = "";

	for (gIter = list; gIter != NULL; gIter = gIter->next) {
	const char value = (const char ) gIter->data;

	pos = &pos[sprintf(pos, "%s%s", lead_delim, value)];
	lead_delim = delim;
	}
	if (max && terminate_with_delim) {
	sprintf(pos, "%s", delim);
	}
	}
	return rv;
	}

	static int
	stonith_device_action(xmlNode * msg, char **output)
	{
	xmlNode *dev = get_xpath_object("//" F_STONITH_DEVICE, msg, LOG_ERR);
	xmlNode *op = get_xpath_object("//@" F_STONITH_ACTION, msg, LOG_ERR);
	const char *id = crm_element_value(dev, F_STONITH_DEVICE);
	const char *action = crm_element_value(op, F_STONITH_ACTION);
	async_command_t *cmd = NULL;
	stonith_device_t *device = NULL;

	if ((id == NULL) \|\| (action == NULL)) {
	crm_info("Malformed API action request: device %s, action %s",
	(id? id : "not specified"),
	(action? action : "not specified"));
	return -EPROTO;
	}

	if (pcmk__str_eq(id, STONITH_WATCHDOG_ID, pcmk__str_none)) {
	if (stonith_watchdog_timeout_ms <= 0) {
	return -ENODEV;
	} else {
	if (pcmk__str_eq(action, "list", pcmk__str_casei)) {
	*output = list_to_string(stonith_watchdog_targets, "\n", TRUE);
	return pcmk_ok;
	} else if (pcmk__str_eq(action, "monitor", pcmk__str_casei)) {
	return pcmk_ok;
	}
	}
	}

	device = g_hash_table_lookup(device_list, id);
	if ((device == NULL)
	\|\| (!device->api_registered && !strcmp(action, "monitor"))) {

	// Monitors may run only on "started" (API-registered) devices
	crm_info("Ignoring API '%s' action request because device %s not found",
	action, id);
	return -ENODEV;
	}

	cmd = create_async_command(msg);
	if (cmd == NULL) {
	return -EPROTO;
	}

	schedule_stonith_command(cmd, device);
	return -EINPROGRESS;
	}

	static void
	search_devices_record_result(struct device_search_s search, const char device, gboolean can_fence)
	{
	search->replies_received++;

	if (can_fence && device) {
	search->capable = g_list_append(search->capable, strdup(device));
	}

	if (search->replies_needed == search->replies_received) {

	guint ndevices = g_list_length(search->capable);

	crm_debug("Search found %d device%s that can perform '%s' targeting %s",
	ndevices, pcmk__plural_s(ndevices),
	(search->action? search->action : "unknown action"),
	(search->host? search->host : "any node"));

	search->callback(search->capable, search->user_data);
	free(search->host);
	free(search->action);
	free(search);
	}
	}

	/*!
	* \internal
	* \brief Check whether the local host is allowed to execute a fencing action
	*
	* \param[in] device Fence device to check
	* \param[in] action Fence action to check
	* \param[in] target Hostname of fence target
	* \param[in] allow_suicide Whether self-fencing is allowed for this operation
	*
	* \return TRUE if local host is allowed to execute action, FALSE otherwise
	*/
	static gboolean
	localhost_is_eligible(const stonith_device_t device, const char action,
	const char *target, gboolean allow_suicide)
	{
	gboolean localhost_is_target = pcmk__str_eq(target, stonith_our_uname,
	pcmk__str_casei);

	if (device && action && device->on_target_actions
	&& strstr(device->on_target_actions, action)) {
	if (!localhost_is_target) {
	crm_trace("Operation '%s' using %s can only be executed for "
	"local host, not %s", action, device->id, target);
	return FALSE;
	}

	} else if (localhost_is_target && !allow_suicide) {
	crm_trace("'%s' operation does not support self-fencing", action);
	return FALSE;
	}
	return TRUE;
	}

	static void
	can_fence_host_with_device(stonith_device_t * dev, struct device_search_s *search)
	{
	gboolean can = FALSE;
	const char *check_type = NULL;
	const char *host = search->host;
	const char *alias = NULL;

	CRM_LOG_ASSERT(dev != NULL);

	if (dev == NULL) {
	goto search_report_results;
	} else if (host == NULL) {
	can = TRUE;
	goto search_report_results;
	}

	/* Short-circuit query if this host is not allowed to perform the action */
	if (pcmk__str_eq(search->action, "reboot", pcmk__str_casei)) {
	/* A "reboot" might get remapped to "off" then "on", so short-circuit
	* only if all three are disallowed. If only one or two are disallowed,
	* we'll report that with the results. We never allow suicide for
	* remapped "on" operations because the host is off at that point.
	*/
	if (!localhost_is_eligible(dev, "reboot", host, search->allow_suicide)
	&& !localhost_is_eligible(dev, "off", host, search->allow_suicide)
	&& !localhost_is_eligible(dev, "on", host, FALSE)) {
	goto search_report_results;
	}
	} else if (!localhost_is_eligible(dev, search->action, host,
	search->allow_suicide)) {
	goto search_report_results;
	}

	alias = g_hash_table_lookup(dev->aliases, host);
	if (alias == NULL) {
	alias = host;
	}

	check_type = target_list_type(dev);

	if (pcmk__str_eq(check_type, "none", pcmk__str_casei)) {
	can = TRUE;

	} else if (pcmk__str_eq(check_type, "static-list", pcmk__str_casei)) {

	/* Presence in the hostmap is sufficient
	* Only use if all hosts on which the device can be active can always fence all listed hosts
	*/

	if (pcmk__str_in_list(host, dev->targets, pcmk__str_casei)) {
	can = TRUE;
	} else if (g_hash_table_lookup(dev->params, PCMK_STONITH_HOST_MAP)
	&& g_hash_table_lookup(dev->aliases, host)) {
	can = TRUE;
	}

	} else if (pcmk__str_eq(check_type, "dynamic-list", pcmk__str_casei)) {
	time_t now = time(NULL);

	if (dev->targets == NULL \|\| dev->targets_age + 60 < now) {
	int device_timeout = get_action_timeout(dev, "list", search->per_device_timeout);

	if (device_timeout > search->per_device_timeout) {
	crm_notice("Since the pcmk_list_timeout(%ds) parameter of %s is larger than stonith-timeout(%ds), timeout may occur",
	device_timeout, dev->id, search->per_device_timeout);
	}

	crm_trace("Running '%s' to check whether %s is eligible to fence %s (%s)",
	check_type, dev->id, search->host, search->action);

	schedule_internal_command(__func__, dev, "list", NULL,
	search->per_device_timeout, search, dynamic_list_search_cb);

	/* we'll respond to this search request async in the cb */
	return;
	}

	if (pcmk__str_in_list(alias, dev->targets, pcmk__str_casei)) {
	can = TRUE;
	}

	} else if (pcmk__str_eq(check_type, "status", pcmk__str_casei)) {
	int device_timeout = get_action_timeout(dev, check_type, search->per_device_timeout);

	if (device_timeout > search->per_device_timeout) {
	crm_notice("Since the pcmk_status_timeout(%ds) parameter of %s is larger than stonith-timeout(%ds), timeout may occur",
	device_timeout, dev->id, search->per_device_timeout);
	}

	crm_trace("Running '%s' to check whether %s is eligible to fence %s (%s)",
	check_type, dev->id, search->host, search->action);
	schedule_internal_command(__func__, dev, "status", search->host,
	search->per_device_timeout, search, status_search_cb);
	/* we'll respond to this search request async in the cb */
	return;
	} else {
	crm_err("Invalid value for " PCMK_STONITH_HOST_CHECK ": %s", check_type);
	check_type = "Invalid " PCMK_STONITH_HOST_CHECK;
	}

	if (pcmk__str_eq(host, alias, pcmk__str_casei)) {
	crm_notice("%s is%s eligible to fence (%s) %s: %s",
	dev->id, (can? "" : " not"), search->action, host,
	check_type);
	} else {
	crm_notice("%s is%s eligible to fence (%s) %s (aka. '%s'): %s",
	dev->id, (can? "" : " not"), search->action, host, alias,
	check_type);
	}

	search_report_results:
	search_devices_record_result(search, dev ? dev->id : NULL, can);
	}

	static void
	search_devices(gpointer key, gpointer value, gpointer user_data)
	{
	stonith_device_t *dev = value;
	struct device_search_s *search = user_data;

	can_fence_host_with_device(dev, search);
	}

	#define DEFAULT_QUERY_TIMEOUT 20
	static void
	get_capable_devices(const char host, const char action, int timeout, bool suicide, void *user_data,
	void (callback) (GList devices, void *user_data))
	{
	struct device_search_s *search;
	guint ndevices = g_hash_table_size(device_list);

	if (ndevices == 0) {
	callback(NULL, user_data);
	return;
	}

	search = calloc(1, sizeof(struct device_search_s));
	if (!search) {
	crm_crit("Cannot search for capable fence devices: %s",
	strerror(ENOMEM));
	callback(NULL, user_data);
	return;
	}

	search->host = host ? strdup(host) : NULL;
	search->action = action ? strdup(action) : NULL;
	search->per_device_timeout = timeout;
	search->allow_suicide = suicide;
	search->callback = callback;
	search->user_data = user_data;

	/* We are guaranteed this many replies, even if a device is
	* unregistered while the search is in progress.
	*/
	search->replies_needed = ndevices;

	crm_debug("Searching %d device%s to see which can execute '%s' targeting %s",
	ndevices, pcmk__plural_s(ndevices),
	(search->action? search->action : "unknown action"),
	(search->host? search->host : "any node"));
	g_hash_table_foreach(device_list, search_devices, search);
	}

	struct st_query_data {
	xmlNode *reply;
	char *remote_peer;
	char *client_id;
	char *target;
	char *action;
	int call_options;
	};

	/*!
	* \internal
	* \brief Add action-specific attributes to query reply XML
	*
	* \param[in,out] xml XML to add attributes to
	* \param[in] action Fence action
	* \param[in] device Fence device
	* \param[in] target Fence target
	*/
	static void
	add_action_specific_attributes(xmlNode xml, const char action,
	stonith_device_t device, const char target)
	{
	int action_specific_timeout;
	int delay_max;
	int delay_base;

	CRM_CHECK(xml && action && device, return);

	if (is_action_required(action, device)) {
	crm_trace("Action '%s' is required using %s", action, device->id);
	crm_xml_add_int(xml, F_STONITH_DEVICE_REQUIRED, 1);
	}

	action_specific_timeout = get_action_timeout(device, action, 0);
	if (action_specific_timeout) {
	crm_trace("Action '%s' has timeout %dms using %s",
	action, action_specific_timeout, device->id);
	crm_xml_add_int(xml, F_STONITH_ACTION_TIMEOUT, action_specific_timeout);
	}

	delay_max = get_action_delay_max(device, action);
	if (delay_max > 0) {
	crm_trace("Action '%s' has maximum random delay %dms using %s",
	action, delay_max, device->id);
	crm_xml_add_int(xml, F_STONITH_DELAY_MAX, delay_max / 1000);
	}

	delay_base = get_action_delay_base(device, action, target);
	if (delay_base > 0) {
	crm_xml_add_int(xml, F_STONITH_DELAY_BASE, delay_base / 1000);
	}

	if ((delay_max > 0) && (delay_base == 0)) {
	crm_trace("Action '%s' has maximum random delay %dms using %s",
	action, delay_max, device->id);
	} else if ((delay_max == 0) && (delay_base > 0)) {
	crm_trace("Action '%s' has a static delay of %dms using %s",
	action, delay_base, device->id);
	} else if ((delay_max > 0) && (delay_base > 0)) {
	crm_trace("Action '%s' has a minimum delay of %dms and a randomly chosen "
	"maximum delay of %dms using %s",
	action, delay_base, delay_max, device->id);
	}
	}

	/*!
	* \internal
	* \brief Add "disallowed" attribute to query reply XML if appropriate
	*
	* \param[in,out] xml XML to add attribute to
	* \param[in] action Fence action
	* \param[in] device Fence device
	* \param[in] target Fence target
	* \param[in] allow_suicide Whether self-fencing is allowed
	*/
	static void
	add_disallowed(xmlNode xml, const char action, stonith_device_t *device,
	const char *target, gboolean allow_suicide)
	{
	if (!localhost_is_eligible(device, action, target, allow_suicide)) {
	crm_trace("Action '%s' using %s is disallowed for local host",
	action, device->id);
	pcmk__xe_set_bool_attr(xml, F_STONITH_ACTION_DISALLOWED, true);
	}
	}

	/*!
	* \internal
	* \brief Add child element with action-specific values to query reply XML
	*
	* \param[in,out] xml XML to add attribute to
	* \param[in] action Fence action
	* \param[in] device Fence device
	* \param[in] target Fence target
	* \param[in] allow_suicide Whether self-fencing is allowed
	*/
	static void
	add_action_reply(xmlNode xml, const char action, stonith_device_t *device,
	const char *target, gboolean allow_suicide)
	{
	xmlNode *child = create_xml_node(xml, F_STONITH_ACTION);

	crm_xml_add(child, XML_ATTR_ID, action);
	add_action_specific_attributes(child, action, device, target);
	add_disallowed(child, action, device, target, allow_suicide);
	}

	static void
	stonith_query_capable_device_cb(GList * devices, void *user_data)
	{
	struct st_query_data *query = user_data;
	int available_devices = 0;
	xmlNode *dev = NULL;
	xmlNode *list = NULL;
	GList *lpc = NULL;

	/* Pack the results into XML */
	list = create_xml_node(NULL, __func__);
	crm_xml_add(list, F_STONITH_TARGET, query->target);
	for (lpc = devices; lpc != NULL; lpc = lpc->next) {
	stonith_device_t *device = g_hash_table_lookup(device_list, lpc->data);
	const char *action = query->action;

	if (!device) {
	/* It is possible the device got unregistered while
	* determining who can fence the target */
	continue;
	}

	available_devices++;

	dev = create_xml_node(list, F_STONITH_DEVICE);
	crm_xml_add(dev, XML_ATTR_ID, device->id);
	crm_xml_add(dev, "namespace", device->namespace);
	crm_xml_add(dev, "agent", device->agent);
	crm_xml_add_int(dev, F_STONITH_DEVICE_VERIFIED, device->verified);

	/* If the originating fencer wants to reboot the node, and we have a
	* capable device that doesn't support "reboot", remap to "off" instead.
	*/
	if (!pcmk_is_set(device->flags, st_device_supports_reboot)
	&& pcmk__str_eq(query->action, "reboot", pcmk__str_casei)) {
	crm_trace("%s doesn't support reboot, using values for off instead",
	device->id);
	action = "off";
	}

	/* Add action-specific values if available */
	add_action_specific_attributes(dev, action, device, query->target);
	if (pcmk__str_eq(query->action, "reboot", pcmk__str_casei)) {
	/* A "reboot" might get remapped to "off" then "on", so after
	* sending the "reboot"-specific values in the main element, we add
	* sub-elements for "off" and "on" values.
	*
	* We short-circuited earlier if "reboot", "off" and "on" are all
	* disallowed for the local host. However if only one or two are
	* disallowed, we send back the results and mark which ones are
	* disallowed. If "reboot" is disallowed, this might cause problems
	* with older fencer versions, which won't check for it. Older
	* versions will ignore "off" and "on", so they are not a problem.
	*/
	add_disallowed(dev, action, device, query->target,
	pcmk_is_set(query->call_options, st_opt_allow_suicide));
	add_action_reply(dev, "off", device, query->target,
	pcmk_is_set(query->call_options, st_opt_allow_suicide));
	add_action_reply(dev, "on", device, query->target, FALSE);
	}

	/* A query without a target wants device parameters */
	if (query->target == NULL) {
	xmlNode *attrs = create_xml_node(dev, XML_TAG_ATTRS);

	g_hash_table_foreach(device->params, hash2field, attrs);
	}
	}

	crm_xml_add_int(list, F_STONITH_AVAILABLE_DEVICES, available_devices);
	if (query->target) {
	crm_debug("Found %d matching device%s for target '%s'",
	available_devices, pcmk__plural_s(available_devices),
	query->target);
	} else {
	crm_debug("%d device%s installed",
	available_devices, pcmk__plural_s(available_devices));
	}

	if (list != NULL) {
	crm_log_xml_trace(list, "Add query results");
	add_message_xml(query->reply, F_STONITH_CALLDATA, list);
	}
	stonith_send_reply(query->reply, query->call_options, query->remote_peer, query->client_id);

	free_xml(query->reply);
	free(query->remote_peer);
	free(query->client_id);
	free(query->target);
	free(query->action);
	free(query);
	free_xml(list);
	g_list_free_full(devices, free);
	}

	static void
	stonith_query(xmlNode * msg, const char remote_peer, const char client_id, int call_options)
	{
	struct st_query_data *query = NULL;
	const char *action = NULL;
	const char *target = NULL;
	int timeout = 0;
	xmlNode *dev = get_xpath_object("//@" F_STONITH_ACTION, msg, LOG_NEVER);

	crm_element_value_int(msg, F_STONITH_TIMEOUT, &timeout);
	if (dev) {
	const char *device = crm_element_value(dev, F_STONITH_DEVICE);

	target = crm_element_value(dev, F_STONITH_TARGET);
	action = crm_element_value(dev, F_STONITH_ACTION);
	if (device && pcmk__str_eq(device, "manual_ack", pcmk__str_casei)) {
	/* No query or reply necessary */
	return;
	}
	}

	crm_log_xml_debug(msg, "Query");
	query = calloc(1, sizeof(struct st_query_data));

	query->reply = stonith_construct_reply(msg, NULL, NULL, pcmk_ok);
	query->remote_peer = remote_peer ? strdup(remote_peer) : NULL;
	query->client_id = client_id ? strdup(client_id) : NULL;
	query->target = target ? strdup(target) : NULL;
	query->action = action ? strdup(action) : NULL;
	query->call_options = call_options;

	get_capable_devices(target, action, timeout,
	pcmk_is_set(call_options, st_opt_allow_suicide),
	query, stonith_query_capable_device_cb);
	}

	/*!
	* \internal
	* \brief Log the result of an asynchronous command
	*
	* \param[in] cmd Command the result is for
	* \param[in] result Result of command
	* \param[in] pid Process ID of command, if available
	* \param[in] next Alternate device that will be tried if command failed
	* \param[in] op_merged Whether this command was merged with an earlier one
	*/
	static void
	log_async_result(async_command_t cmd, const pcmk__action_result_t result,
	int pid, const char *next, bool op_merged)
	{
	int log_level = LOG_ERR;
	int output_log_level = LOG_NEVER;
	guint devices_remaining = g_list_length(cmd->device_next);

	GString *msg = g_string_sized_new(80); // Reasonable starting size

	// Choose log levels appropriately if we have a result
	if (pcmk__result_ok(result)) {
	log_level = (cmd->victim == NULL)? LOG_DEBUG : LOG_NOTICE;
	if ((result->action_stdout != NULL)
	&& !pcmk__str_eq(cmd->action, "metadata", pcmk__str_casei)) {
	output_log_level = LOG_DEBUG;
	}
	next = NULL;
	} else {
	log_level = (cmd->victim == NULL)? LOG_NOTICE : LOG_ERR;
	if ((result->action_stdout != NULL)
	&& !pcmk__str_eq(cmd->action, "metadata", pcmk__str_casei)) {
	output_log_level = LOG_WARNING;
	}
	}

	// Build the log message piece by piece
	g_string_printf(msg, "Operation '%s' ", cmd->action);
	if (pid != 0) {
	g_string_append_printf(msg, "[%d] ", pid);
	}
	if (cmd->victim != NULL) {
	g_string_append_printf(msg, "targeting %s ", cmd->victim);
	}
	g_string_append_printf(msg, "using %s ", cmd->device);

	// Add exit status or execution status as appropriate
	if (result->execution_status == PCMK_EXEC_DONE) {
	g_string_append_printf(msg, "returned %d", result->exit_status);
	} else {
	g_string_append_printf(msg, "could not be executed: %s",
	pcmk_exec_status_str(result->execution_status));
	}

	// Add exit reason and next device if appropriate
	if (result->exit_reason != NULL) {
	g_string_append_printf(msg, " (%s)", result->exit_reason);
	}
	if (next != NULL) {
	g_string_append_printf(msg, ", retrying with %s", next);
	}
	if (devices_remaining > 0) {
	g_string_append_printf(msg, " (%u device%s remaining)",
	(unsigned int) devices_remaining,
	pcmk__plural_s(devices_remaining));
	}
	g_string_append_printf(msg, " " CRM_XS " %scall %d from %s",
	(op_merged? "merged " : ""), cmd->id,
	cmd->client_name);

	// Log the result
	do_crm_log(log_level, "%s", msg->str);
	g_string_free(msg, TRUE);

	// Log the output (which may have multiple lines), if appropriate
	if (output_log_level != LOG_NEVER) {
	char *prefix = crm_strdup_printf("%s[%d]", cmd->device, pid);

	crm_log_output(output_log_level, prefix, result->action_stdout);
	free(prefix);
	}
	}

	/*!
	* \internal
	* \brief Reply to requester after asynchronous command completion
	*
	* \param[in] cmd Command that completed
	* \param[in] result Result of command
	* \param[in] pid Process ID of command, if available
	* \param[in] merged If true, command was merged with another, not executed
	*/
	static void
	send_async_reply(async_command_t cmd, const pcmk__action_result_t result,
	int pid, bool merged)
	{
	xmlNode *reply = NULL;
	bool bcast = false;

	CRM_CHECK((cmd != NULL) && (result != NULL), return);

	reply = construct_async_reply(cmd, result);

	// If target was also the originator, broadcast fencing results for it
	if (!stand_alone && pcmk__is_fencing_action(cmd->action)
	&& pcmk__str_eq(cmd->origin, cmd->victim, pcmk__str_casei)) {

	crm_trace("Broadcast '%s' result for %s (target was also originator)",
	cmd->action, cmd->victim);
	crm_xml_add(reply, F_SUBTYPE, "broadcast");
	crm_xml_add(reply, F_STONITH_OPERATION, T_STONITH_NOTIFY);
	bcast = true;
	}

	log_async_result(cmd, result, pid, NULL, merged);

	if (merged) {
	pcmk__xe_set_bool_attr(reply, F_STONITH_MERGED, true);
	}
	crm_log_xml_trace(reply, "Reply");

	if (bcast) {
	send_cluster_message(NULL, crm_msg_stonith_ng, reply, FALSE);
	} else {
	stonith_send_reply(reply, cmd->options, cmd->origin, cmd->client);
	}

	if (stand_alone) {
	/* Do notification with a clean data object */
	xmlNode *notify_data = create_xml_node(NULL, T_STONITH_NOTIFY_FENCE);
	int rc = pcmk_rc2legacy(stonith__result2rc(result));

	crm_xml_add_int(notify_data, F_STONITH_RC, rc);
	crm_xml_add(notify_data, F_STONITH_TARGET, cmd->victim);
	crm_xml_add(notify_data, F_STONITH_OPERATION, cmd->op);
	crm_xml_add(notify_data, F_STONITH_DELEGATE, "localhost");
	crm_xml_add(notify_data, F_STONITH_DEVICE, cmd->device);
	crm_xml_add(notify_data, F_STONITH_REMOTE_OP_ID, cmd->remote_op_id);
	crm_xml_add(notify_data, F_STONITH_ORIGIN, cmd->client);

	do_stonith_notify(T_STONITH_NOTIFY_FENCE, rc, notify_data);
	do_stonith_notify(T_STONITH_NOTIFY_HISTORY, pcmk_ok, NULL);
	}

	free_xml(reply);
	}

	static void
	cancel_stonith_command(async_command_t * cmd)
	{
	stonith_device_t *device;

	CRM_CHECK(cmd != NULL, return);

	if (!cmd->device) {
	return;
	}

	device = g_hash_table_lookup(device_list, cmd->device);

	if (device) {
	crm_trace("Cancel scheduled '%s' action using %s",
	cmd->action, device->id);
	device->pending_ops = g_list_remove(device->pending_ops, cmd);
	}
	}

	static void
	st_child_done(int pid, const pcmk__action_result_t result, void user_data)
	{
	stonith_device_t *device = NULL;
	stonith_device_t *next_device = NULL;
	async_command_t *cmd = user_data;

	GList *gIter = NULL;
	GList *gIterNext = NULL;

	CRM_CHECK(cmd != NULL, return);

	cmd->active_on = NULL;

	/* The device is ready to do something else now */
	device = g_hash_table_lookup(device_list, cmd->device);
	if (device) {
	if (!device->verified && pcmk__result_ok(result) &&
	(pcmk__strcase_any_of(cmd->action, "list", "monitor", "status", NULL))) {

	device->verified = TRUE;
	}

	mainloop_set_trigger(device->work);
	}

	if (pcmk__result_ok(result)) {
	GList *iter;
	/* see if there are any required devices left to execute for this op */
	for (iter = cmd->device_next; iter != NULL; iter = iter->next) {
	next_device = g_hash_table_lookup(device_list, iter->data);

	if (next_device != NULL && is_action_required(cmd->action, next_device)) {
	cmd->device_next = iter->next;
	break;
	}
	next_device = NULL;
	}

	} else if ((cmd->device_next != NULL)
	&& !is_action_required(cmd->action, device)) {
	/* if this device didn't work out, see if there are any others we can try.
	* if the failed device was 'required', we can't pick another device. */
	next_device = g_hash_table_lookup(device_list, cmd->device_next->data);
	cmd->device_next = cmd->device_next->next;
	}

	/* this operation requires more fencing, hooray! */
	if (next_device) {
	log_async_result(cmd, result, pid, next_device->id, false);
	schedule_stonith_command(cmd, next_device);
	/* Prevent cmd from being freed */
	cmd = NULL;
	goto done;
	}

	send_async_reply(cmd, result, pid, false);

	if (!pcmk__result_ok(result)) {
	goto done;
	}

	/* Check to see if any operations are scheduled to do the exact
	* same thing that just completed. If so, rather than
	* performing the same fencing operation twice, return the result
	* of this operation for all pending commands it matches. */
	for (gIter = cmd_list; gIter != NULL; gIter = gIterNext) {
	async_command_t *cmd_other = gIter->data;

	gIterNext = gIter->next;

	if (cmd == cmd_other) {
	continue;
	}

	/* A pending scheduled command matches the command that just finished if.
	* 1. The client connections are different.
	* 2. The node victim is the same.
	* 3. The fencing action is the same.
	* 4. The device scheduled to execute the action is the same.
	*/
	if (pcmk__str_eq(cmd->client, cmd_other->client, pcmk__str_casei) \|\|
	!pcmk__str_eq(cmd->victim, cmd_other->victim, pcmk__str_casei) \|\|
	!pcmk__str_eq(cmd->action, cmd_other->action, pcmk__str_casei) \|\|
	!pcmk__str_eq(cmd->device, cmd_other->device, pcmk__str_casei)) {

	continue;
	}

	/* Duplicate merging will do the right thing for either type of remapped
	* reboot. If the executing fencer remapped an unsupported reboot to
	* off, then cmd->action will be reboot and will be merged with any
	* other reboot requests. If the originating fencer remapped a
	* topology reboot to off then on, we will get here once with
	* cmd->action "off" and once with "on", and they will be merged
	* separately with similar requests.
	*/
	crm_notice("Merging fencing action '%s' targeting %s originating from "
	"client %s with identical fencing request from client %s",
	cmd_other->action, cmd_other->victim, cmd_other->client_name,
	cmd->client_name);

	cmd_list = g_list_remove_link(cmd_list, gIter);

	send_async_reply(cmd_other, result, pid, true);
	cancel_stonith_command(cmd_other);

	free_async_command(cmd_other);
	g_list_free_1(gIter);
	}

	done:
	free_async_command(cmd);
	}

	static gint
	sort_device_priority(gconstpointer a, gconstpointer b)
	{
	const stonith_device_t *dev_a = a;
	const stonith_device_t *dev_b = b;

	if (dev_a->priority > dev_b->priority) {
	return -1;
	} else if (dev_a->priority < dev_b->priority) {
	return 1;
	}
	return 0;
	}

	static void
	stonith_fence_get_devices_cb(GList * devices, void *user_data)
	{
	async_command_t *cmd = user_data;
	stonith_device_t *device = NULL;
	guint ndevices = g_list_length(devices);

	crm_info("Found %d matching device%s for target '%s'",
	ndevices, pcmk__plural_s(ndevices), cmd->victim);

	if (devices != NULL) {
	/* Order based on priority */
	devices = g_list_sort(devices, sort_device_priority);
	device = g_hash_table_lookup(device_list, devices->data);
	}

	if (device == NULL) { // No device found
	pcmk__action_result_t result = PCMK__UNKNOWN_RESULT;

	pcmk__set_result(&result, CRM_EX_ERROR, PCMK_EXEC_NO_FENCE_DEVICE,
	"No fence device configured for target");
	send_async_reply(cmd, &result, 0, false);
	pcmk__reset_result(&result);
	free_async_command(cmd);
	g_list_free_full(devices, free);

	} else { // Device found, schedule it for fencing
	cmd->device_list = devices;
	cmd->device_next = devices->next;
	schedule_stonith_command(cmd, device);
	}
	}

	static int
	stonith_fence(xmlNode * msg)
	{
	const char *device_id = NULL;
	stonith_device_t *device = NULL;
	async_command_t *cmd = create_async_command(msg);
	xmlNode *dev = get_xpath_object("//@" F_STONITH_TARGET, msg, LOG_ERR);

	if (cmd == NULL) {
	return -EPROTO;
	}

	device_id = crm_element_value(dev, F_STONITH_DEVICE);
	if (device_id) {
	device = g_hash_table_lookup(device_list, device_id);
	if (device == NULL) {
	crm_err("Requested device '%s' is not available", device_id);
	return -ENODEV;
	}
	schedule_stonith_command(cmd, device);

	} else {
	const char *host = crm_element_value(dev, F_STONITH_TARGET);

	if (cmd->options & st_opt_cs_nodeid) {
	int nodeid;
	crm_node_t *node;

	pcmk__scan_min_int(host, &nodeid, 0);
	node = pcmk__search_known_node_cache(nodeid, NULL, CRM_GET_PEER_ANY);
	if (node) {
	host = node->uname;
	}
	}

	/* If we get to here, then self-fencing is implicitly allowed */
	get_capable_devices(host, cmd->action, cmd->default_timeout,
	TRUE, cmd, stonith_fence_get_devices_cb);
	}

	return -EINPROGRESS;
	}

	xmlNode *
	stonith_construct_reply(xmlNode * request, const char output, xmlNode data, int rc)
	{
	xmlNode *reply = NULL;

	reply = create_xml_node(NULL, T_STONITH_REPLY);

	crm_xml_add(reply, "st_origin", __func__);
	crm_xml_add(reply, F_TYPE, T_STONITH_NG);
	crm_xml_add(reply, F_STONITH_OUTPUT, output);
	crm_xml_add_int(reply, F_STONITH_RC, rc);

	if (request == NULL) {
	/* Most likely, this is the result of a stonith operation that was
	* initiated before we came up. Unfortunately that means we lack enough
	* information to provide clients with a full result.
	*
	* @TODO Maybe synchronize this information at start-up?
	*/
	crm_warn("Missing request information for client notifications for "
	"operation with result %d (initiated before we came up?)", rc);

	} else {
	const char *name = NULL;
	const char *value = NULL;

	const char *names[] = {
	F_STONITH_OPERATION,
	F_STONITH_CALLID,
	F_STONITH_CLIENTID,
	F_STONITH_CLIENTNAME,
	F_STONITH_REMOTE_OP_ID,
	F_STONITH_CALLOPTS
	};

	crm_trace("Creating a result reply with%s reply output (rc=%d)",
	(data? "" : "out"), rc);
	for (int lpc = 0; lpc < PCMK__NELEM(names); lpc++) {
	name = names[lpc];
	value = crm_element_value(request, name);
	crm_xml_add(reply, name, value);
	}
	if (data != NULL) {
	add_message_xml(reply, F_STONITH_CALLDATA, data);
	}
	}
	return reply;
	}

	/*!
	* \internal
	* \brief Build an XML reply to an asynchronous fencing command
	*
	* \param[in] cmd Fencing command that reply is for
	* \param[in] result Command result
	*/
	static xmlNode *
	construct_async_reply(async_command_t cmd, const pcmk__action_result_t result)
	{
	xmlNode *reply = create_xml_node(NULL, T_STONITH_REPLY);

	crm_xml_add(reply, "st_origin", __func__);
	crm_xml_add(reply, F_TYPE, T_STONITH_NG);
	crm_xml_add(reply, F_STONITH_OPERATION, cmd->op);
	crm_xml_add(reply, F_STONITH_DEVICE, cmd->device);
	crm_xml_add(reply, F_STONITH_REMOTE_OP_ID, cmd->remote_op_id);
	crm_xml_add(reply, F_STONITH_CLIENTID, cmd->client);
	crm_xml_add(reply, F_STONITH_CLIENTNAME, cmd->client_name);
	crm_xml_add(reply, F_STONITH_TARGET, cmd->victim);
	crm_xml_add(reply, F_STONITH_ACTION, cmd->op);
	crm_xml_add(reply, F_STONITH_ORIGIN, cmd->origin);
	crm_xml_add_int(reply, F_STONITH_CALLID, cmd->id);
	crm_xml_add_int(reply, F_STONITH_CALLOPTS, cmd->options);
	crm_xml_add_int(reply, F_STONITH_RC,
	pcmk_rc2legacy(stonith__result2rc(result)));
	crm_xml_add(reply, F_STONITH_OUTPUT, result->action_stdout);
	return reply;
	}

	bool fencing_peer_active(crm_node_t *peer)
	{
	if (peer == NULL) {
	return FALSE;
	} else if (peer->uname == NULL) {
	return FALSE;
	} else if (pcmk_is_set(peer->processes, crm_get_cluster_proc())) {
	return TRUE;
	}
	return FALSE;
	}

	void set_fencing_completed(remote_fencing_op_t * op)
	{
	#ifdef CLOCK_MONOTONIC
	struct timespec tv;

	clock_gettime(CLOCK_MONOTONIC, &tv);

	op->completed = tv.tv_sec;
	op->completed_nsec = tv.tv_nsec;
	#else
	op->completed = time(NULL);
	op->completed_nsec = 0L;
	#endif
	}

	/*!
	* \internal
	* \brief Look for alternate node needed if local node shouldn't fence target
	*
	* \param[in] target Node that must be fenced
	*
	* \return Name of an alternate node that should fence \p target if any,
	* or NULL otherwise
	*/
	static const char *
	check_alternate_host(const char *target)
	{
	const char *alternate_host = NULL;

	crm_trace("Checking if we (%s) can fence %s", stonith_our_uname, target);
	if (find_topology_for_host(target) && pcmk__str_eq(target, stonith_our_uname, pcmk__str_casei)) {
	GHashTableIter gIter;
	crm_node_t *entry = NULL;

	g_hash_table_iter_init(&gIter, crm_peer_cache);
	while (g_hash_table_iter_next(&gIter, NULL, (void **)&entry)) {
	crm_trace("Checking for %s.%d != %s", entry->uname, entry->id, target);
	if (fencing_peer_active(entry)
	&& !pcmk__str_eq(entry->uname, target, pcmk__str_casei)) {
	alternate_host = entry->uname;
	break;
	}
	}
	if (alternate_host == NULL) {
	crm_err("No alternate host available to handle request "
	"for self-fencing with topology");
	g_hash_table_iter_init(&gIter, crm_peer_cache);
	while (g_hash_table_iter_next(&gIter, NULL, (void **)&entry)) {
	crm_notice("Peer[%d] %s", entry->id, entry->uname);
	}
	}
	}

	return alternate_host;
	}

	/*!
	* \internal
	* \brief Send a reply to a CPG peer or IPC client
	*
	* \param[in] reply XML reply to send
	* \param[in] call_options Send synchronously if st_opt_sync_call is set here
	* \param[in] remote_peer If not NULL, name of peer node to send CPG reply
	* \param[in] client_id If not NULL, name of client to send IPC reply
	*/
	static void
	stonith_send_reply(xmlNode reply, int call_options, const char remote_peer,
	const char *client_id)
	{
	CRM_CHECK((reply != NULL) && ((remote_peer != NULL) \|\| (client_id != NULL)),
	return);

	if (remote_peer == NULL) {
	do_local_reply(reply, client_id,
	pcmk_is_set(call_options, st_opt_sync_call), FALSE);
	} else {
	send_cluster_message(crm_get_peer(0, remote_peer), crm_msg_stonith_ng,
	reply, FALSE);
	}
	}

	static void
	remove_relay_op(xmlNode * request)
	{
	xmlNode *dev = get_xpath_object("//@" F_STONITH_ACTION, request, LOG_TRACE);
	const char *relay_op_id = NULL;
	const char *op_id = NULL;
	const char *client_name = NULL;
	const char *target = NULL;
	remote_fencing_op_t *relay_op = NULL;

	if (dev) {
	target = crm_element_value(dev, F_STONITH_TARGET);
	}

	relay_op_id = crm_element_value(request, F_STONITH_REMOTE_OP_ID_RELAY);
	op_id = crm_element_value(request, F_STONITH_REMOTE_OP_ID);
	client_name = crm_element_value(request, F_STONITH_CLIENTNAME);

	/* Delete RELAY operation. */
	if (relay_op_id && target && pcmk__str_eq(target, stonith_our_uname, pcmk__str_casei)) {
	relay_op = g_hash_table_lookup(stonith_remote_op_list, relay_op_id);

	if (relay_op) {
	GHashTableIter iter;
	remote_fencing_op_t *list_op = NULL;
	g_hash_table_iter_init(&iter, stonith_remote_op_list);

	/* If the operation to be deleted is registered as a duplicate, delete the registration. */
	while (g_hash_table_iter_next(&iter, NULL, (void **)&list_op)) {
	GList *dup_iter = NULL;
	if (list_op != relay_op) {
	for (dup_iter = list_op->duplicates; dup_iter != NULL; dup_iter = dup_iter->next) {
	remote_fencing_op_t *other = dup_iter->data;
	if (other == relay_op) {
	other->duplicates = g_list_remove(other->duplicates, relay_op);
	break;
	}
	}
	}
	}
	crm_debug("Deleting relay op %s ('%s' targeting %s for %s), "
	"replaced by op %s ('%s' targeting %s for %s)",
	relay_op->id, relay_op->action, relay_op->target,
	relay_op->client_name, op_id, relay_op->action, target,
	client_name);

	g_hash_table_remove(stonith_remote_op_list, relay_op_id);
	}
	}
	}

	/*!
	* \internal
	* \brief Check whether an API request was sent by a privileged user
	*
	* API commands related to fencing configuration may be done only by privileged
	* IPC users (i.e. root or hacluster), because all other users should go through
	* the CIB to have ACLs applied. If no client was given, this is a peer request,
	* which is always allowed.
	*
	* \param[in] c IPC client that sent request (or NULL if sent by CPG peer)
	* \param[in] op Requested API operation (for logging only)
	*
	* \return true if sender is peer or privileged client, otherwise false
	*/
	static inline bool
	is_privileged(pcmk__client_t c, const char op)
	{
	if ((c == NULL) \|\| pcmk_is_set(c->flags, pcmk__client_privileged)) {
	return true;
	} else {
	crm_warn("Rejecting IPC request '%s' from unprivileged client %s",
	crm_str(op), pcmk__client_name(c));
	return false;
	}
	}

	static void
	handle_request(pcmk__client_t *client, uint32_t id, uint32_t flags,
	xmlNode request, const char remote_peer)
	{
	int call_options = 0;
	int rc = -EOPNOTSUPP;

	xmlNode *data = NULL;
	xmlNode *reply = NULL;
	bool need_reply = true;

	char *output = NULL;
	const char *op = crm_element_value(request, F_STONITH_OPERATION);
	const char *client_id = crm_element_value(request, F_STONITH_CLIENTID);

	crm_element_value_int(request, F_STONITH_CALLOPTS, &call_options);

	if (pcmk_is_set(call_options, st_opt_sync_call)) {
	CRM_ASSERT(client == NULL \|\| client->request_id == id);
	}

	if (pcmk__str_eq(op, CRM_OP_REGISTER, pcmk__str_none)) {
	xmlNode *reply = create_xml_node(NULL, "reply");

	CRM_ASSERT(client);
	crm_xml_add(reply, F_STONITH_OPERATION, CRM_OP_REGISTER);
	crm_xml_add(reply, F_STONITH_CLIENTID, client->id);
	pcmk__ipc_send_xml(client, id, reply, flags);
	client->request_id = 0;
	free_xml(reply);
	rc = pcmk_ok;
	need_reply = false;

	} else if (pcmk__str_eq(op, STONITH_OP_EXEC, pcmk__str_none)) {
	rc = stonith_device_action(request, &output);
	need_reply = (rc != -EINPROGRESS);

	} else if (pcmk__str_eq(op, STONITH_OP_TIMEOUT_UPDATE, pcmk__str_none)) {
	const char *call_id = crm_element_value(request, F_STONITH_CALLID);
	const char *client_id = crm_element_value(request, F_STONITH_CLIENTID);
	int op_timeout = 0;

	crm_element_value_int(request, F_STONITH_TIMEOUT, &op_timeout);
	do_stonith_async_timeout_update(client_id, call_id, op_timeout);
	rc = pcmk_ok;
	need_reply = false;

	} else if (pcmk__str_eq(op, STONITH_OP_QUERY, pcmk__str_none)) {
	if (remote_peer) {
	create_remote_stonith_op(client_id, request, TRUE); /* Record it for the future notification */
	}

	/* Delete the DC node RELAY operation. */
	remove_relay_op(request);

	stonith_query(request, remote_peer, client_id, call_options);
	rc = pcmk_ok;
	need_reply = false;

	} else if (pcmk__str_eq(op, T_STONITH_NOTIFY, pcmk__str_none)) {
	const char *flag_name = NULL;

	CRM_ASSERT(client);
	flag_name = crm_element_value(request, F_STONITH_NOTIFY_ACTIVATE);
	if (flag_name) {
	crm_debug("Enabling %s callbacks for client %s",
	flag_name, pcmk__client_name(client));
	pcmk__set_client_flags(client, get_stonith_flag(flag_name));
	}

	flag_name = crm_element_value(request, F_STONITH_NOTIFY_DEACTIVATE);
	if (flag_name) {
	crm_debug("Disabling %s callbacks for client %s",
	flag_name, pcmk__client_name(client));
	pcmk__clear_client_flags(client, get_stonith_flag(flag_name));
	}

	pcmk__ipc_send_ack(client, id, flags, "ack", CRM_EX_OK);
	rc = pcmk_ok;
	need_reply = false;

	} else if (pcmk__str_eq(op, STONITH_OP_RELAY, pcmk__str_none)) {
	xmlNode *dev = get_xpath_object("//@" F_STONITH_TARGET, request, LOG_TRACE);

	crm_notice("Received forwarded fencing request from "
	"%s %s to fence (%s) peer %s",
	((client == NULL)? "peer" : "client"),
	((client == NULL)? remote_peer : pcmk__client_name(client)),
	crm_element_value(dev, F_STONITH_ACTION),
	crm_element_value(dev, F_STONITH_TARGET));

	if (initiate_remote_stonith_op(NULL, request, FALSE) == NULL) {
	rc = -EPROTO;
	} else {
	rc = -EINPROGRESS;
	need_reply = false;
	}

	} else if (pcmk__str_eq(op, STONITH_OP_FENCE, pcmk__str_none)) {

	if (remote_peer \|\| stand_alone) {
	rc = stonith_fence(request);

	- } else if (call_options & st_opt_manual_ack) {
	- remote_fencing_op_t *rop = NULL;
	- xmlNode *dev = get_xpath_object("//@" F_STONITH_TARGET, request, LOG_TRACE);
	- const char *target = crm_element_value(dev, F_STONITH_TARGET);
	-
	- crm_notice("Received manual confirmation that %s is fenced", target);
	- rop = initiate_remote_stonith_op(client, request, TRUE);
	- rc = stonith_manual_ack(request, rop);
	+ } else if (pcmk_is_set(call_options, st_opt_manual_ack)) {
	+ switch (fenced_handle_manual_confirmation(client, request)) {
	+ case pcmk_rc_ok:
	+ rc = pcmk_ok;
	+ break;
	+ case EINPROGRESS:
	+ rc = -EINPROGRESS;
	+ break;
	+ default:
	+ rc = -EPROTO;
	+ break;
	+ }

	} else {
	const char *alternate_host = NULL;
	xmlNode *dev = get_xpath_object("//@" F_STONITH_TARGET, request, LOG_TRACE);
	const char *target = crm_element_value(dev, F_STONITH_TARGET);
	const char *action = crm_element_value(dev, F_STONITH_ACTION);
	const char *device = crm_element_value(dev, F_STONITH_DEVICE);

	if (client) {
	int tolerance = 0;

	crm_notice("Client %s wants to fence (%s) %s using %s",
	pcmk__client_name(client), action,
	target, (device? device : "any device"));

	crm_element_value_int(dev, F_STONITH_TOLERANCE, &tolerance);

	if (stonith_check_fence_tolerance(tolerance, target, action)) {
	rc = pcmk_ok;
	goto done;
	}

	} else {
	crm_notice("Peer %s wants to fence (%s) '%s' with device '%s'",
	remote_peer, action, target, device ? device : "(any)");
	}

	alternate_host = check_alternate_host(target);

	if (alternate_host && client) {
	const char *client_id = NULL;
	remote_fencing_op_t *op = NULL;

	crm_notice("Forwarding self-fencing request to peer %s "
	"due to topology", alternate_host);

	if (client->id) {
	client_id = client->id;
	} else {
	client_id = crm_element_value(request, F_STONITH_CLIENTID);
	}

	/* Create an operation for RELAY and send the ID in the RELAY message. */
	/* When a QUERY response is received, delete the RELAY operation to avoid the existence of duplicate operations. */
	op = create_remote_stonith_op(client_id, request, FALSE);

	crm_xml_add(request, F_STONITH_OPERATION, STONITH_OP_RELAY);
	crm_xml_add(request, F_STONITH_CLIENTID, client->id);
	crm_xml_add(request, F_STONITH_REMOTE_OP_ID, op->id);
	send_cluster_message(crm_get_peer(0, alternate_host), crm_msg_stonith_ng, request,
	FALSE);
	rc = -EINPROGRESS;

	} else if (initiate_remote_stonith_op(client, request, FALSE) == NULL) {
	rc = -EPROTO;
	} else {
	rc = -EINPROGRESS;
	}
	}
	need_reply = (rc != -EINPROGRESS);

	} else if (pcmk__str_eq(op, STONITH_OP_FENCE_HISTORY, pcmk__str_none)) {
	rc = stonith_fence_history(request, &data, remote_peer, call_options);
	if (call_options & st_opt_discard_reply) {
	/* we don't expect answers to the broadcast
	* we might have sent out
	*/
	rc = pcmk_ok;
	need_reply = false;
	}

	} else if (pcmk__str_eq(op, STONITH_OP_DEVICE_ADD, pcmk__str_none)) {
	const char *device_id = NULL;

	if (is_privileged(client, op)) {
	rc = stonith_device_register(request, &device_id, FALSE);
	} else {
	rc = -EACCES;
	}
	do_stonith_notify_device(op, rc, device_id);

	} else if (pcmk__str_eq(op, STONITH_OP_DEVICE_DEL, pcmk__str_none)) {
	xmlNode *dev = get_xpath_object("//" F_STONITH_DEVICE, request, LOG_ERR);
	const char *device_id = crm_element_value(dev, XML_ATTR_ID);

	if (is_privileged(client, op)) {
	rc = stonith_device_remove(device_id, FALSE);
	} else {
	rc = -EACCES;
	}
	do_stonith_notify_device(op, rc, device_id);

	} else if (pcmk__str_eq(op, STONITH_OP_LEVEL_ADD, pcmk__str_none)) {
	char *device_id = NULL;

	if (is_privileged(client, op)) {
	rc = stonith_level_register(request, &device_id);
	} else {
	rc = -EACCES;
	}
	do_stonith_notify_level(op, rc, device_id);
	free(device_id);

	} else if (pcmk__str_eq(op, STONITH_OP_LEVEL_DEL, pcmk__str_none)) {
	char *device_id = NULL;

	if (is_privileged(client, op)) {
	rc = stonith_level_remove(request, &device_id);
	} else {
	rc = -EACCES;
	}
	do_stonith_notify_level(op, rc, device_id);

	} else if(pcmk__str_eq(op, CRM_OP_RM_NODE_CACHE, pcmk__str_casei)) {
	int node_id = 0;
	const char *name = NULL;

	crm_element_value_int(request, XML_ATTR_ID, &node_id);
	name = crm_element_value(request, XML_ATTR_UNAME);
	reap_crm_member(node_id, name);
	rc = pcmk_ok;
	need_reply = false;

	} else {
	crm_err("Unknown IPC request %s from %s %s", op,
	((client == NULL)? "peer" : "client"),
	((client == NULL)? remote_peer : pcmk__client_name(client)));
	}

	done:
	// Reply if result is known
	if (need_reply) {
	if (pcmk_is_set(call_options, st_opt_sync_call)) {
	CRM_ASSERT(client == NULL \|\| client->request_id == id);
	}
	reply = stonith_construct_reply(request, output, data, rc);
	stonith_send_reply(reply, call_options, remote_peer, client_id);
	}

	free(output);
	free_xml(data);
	free_xml(reply);

	crm_debug("Processed %s request from %s %s: %s (rc=%d)",
	op, ((client == NULL)? "peer" : "client"),
	((client == NULL)? remote_peer : pcmk__client_name(client)),
	((rc > 0)? "" : pcmk_strerror(rc)), rc);
	}

	static void
	handle_reply(pcmk__client_t client, xmlNode request, const char *remote_peer)
	{
	// Copy, because request might be freed before we want to log this
	char *op = crm_element_value_copy(request, F_STONITH_OPERATION);

	if (pcmk__str_eq(op, STONITH_OP_QUERY, pcmk__str_none)) {
	process_remote_stonith_query(request);
	} else if (pcmk__str_any_of(op, T_STONITH_NOTIFY, STONITH_OP_FENCE, NULL)) {
	process_remote_stonith_exec(request);
	} else {
	crm_err("Ignoring unknown %s reply from %s %s",
	crm_str(op), ((client == NULL)? "peer" : "client"),
	((client == NULL)? remote_peer : pcmk__client_name(client)));
	crm_log_xml_warn(request, "UnknownOp");
	free(op);
	return;
	}
	crm_debug("Processed %s reply from %s %s",
	op, ((client == NULL)? "peer" : "client"),
	((client == NULL)? remote_peer : pcmk__client_name(client)));
	free(op);
	}

	/*!
	* \internal
	* \brief Handle a message from an IPC client or CPG peer
	*
	* \param[in] client If not NULL, IPC client that sent message
	* \param[in] id If from IPC client, IPC message ID
	* \param[in] flags Message flags
	* \param[in] message Message XML
	* \param[in] remote_peer If not NULL, CPG peer that sent message
	*/
	void
	stonith_command(pcmk__client_t *client, uint32_t id, uint32_t flags,
	xmlNode message, const char remote_peer)
	{
	int call_options = st_opt_none;
	bool is_reply = get_xpath_object("//" T_STONITH_REPLY, message,
	LOG_NEVER) != NULL;

	crm_element_value_int(message, F_STONITH_CALLOPTS, &call_options);
	crm_debug("Processing %ssynchronous %s %s %u from %s %s",
	pcmk_is_set(call_options, st_opt_sync_call)? "" : "a",
	crm_element_value(message, F_STONITH_OPERATION),
	(is_reply? "reply" : "request"), id,
	((client == NULL)? "peer" : "client"),
	((client == NULL)? remote_peer : pcmk__client_name(client)));

	if (pcmk_is_set(call_options, st_opt_sync_call)) {
	CRM_ASSERT(client == NULL \|\| client->request_id == id);
	}

	if (is_reply) {
	handle_reply(client, message, remote_peer);
	} else {
	handle_request(client, id, flags, message, remote_peer);
	}
	}
	diff --git a/daemons/fenced/fenced_remote.c b/daemons/fenced/fenced_remote.c
	index 22c4b0772c..60ee5e32ea 100644
	--- a/daemons/fenced/fenced_remote.c
	+++ b/daemons/fenced/fenced_remote.c
	@@ -1,2232 +1,2251 @@
	/*
	* Copyright 2009-2021 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 <sys/param.h>
	#include <stdio.h>
	#include <sys/types.h>
	#include <sys/wait.h>
	#include <sys/stat.h>
	#include <unistd.h>
	#include <sys/utsname.h>

	#include <stdlib.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <ctype.h>
	#include <regex.h>

	#include <crm/crm.h>
	#include <crm/msg_xml.h>
	#include <crm/common/ipc.h>
	#include <crm/common/ipc_internal.h>
	#include <crm/cluster/internal.h>

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

	#include <crm/common/util.h>
	#include <pacemaker-fenced.h>

	#define TIMEOUT_MULTIPLY_FACTOR 1.2

	/* When one fencer queries its peers for devices able to handle a fencing
	* request, each peer will reply with a list of such devices available to it.
	* Each reply will be parsed into a peer_device_info_t, with each device's
	* information kept in a device_properties_t.
	*/

	typedef struct device_properties_s {
	/* Whether access to this device has been verified */
	gboolean verified;

	/* The remaining members are indexed by the operation's "phase" */

	/* Whether this device has been executed in each phase */
	gboolean executed[st_phase_max];
	/* Whether this device is disallowed from executing in each phase */
	gboolean disallowed[st_phase_max];
	/* Action-specific timeout for each phase */
	int custom_action_timeout[st_phase_max];
	/* Action-specific maximum random delay for each phase */
	int delay_max[st_phase_max];
	/* Action-specific base delay for each phase */
	int delay_base[st_phase_max];
	} device_properties_t;

	typedef struct st_query_result_s {
	/* Name of peer that sent this result */
	char *host;
	/* Only try peers for non-topology based operations once */
	gboolean tried;
	/* Number of entries in the devices table */
	int ndevices;
	/* Devices available to this host that are capable of fencing the target */
	GHashTable *devices;
	} peer_device_info_t;

	GHashTable *stonith_remote_op_list = NULL;

	void call_remote_stonith(remote_fencing_op_t op, peer_device_info_t peer,
	int rc);
	static void remote_op_done(remote_fencing_op_t * op, xmlNode * data, int rc, int dup);
	extern xmlNode stonith_create_op(int call_id, const char token, const char op, xmlNode data,
	int call_options);

	static void report_timeout_period(remote_fencing_op_t * op, int op_timeout);
	static int get_op_total_timeout(const remote_fencing_op_t *op,
	const peer_device_info_t *chosen_peer);

	static gint
	sort_strings(gconstpointer a, gconstpointer b)
	{
	return strcmp(a, b);
	}

	static void
	free_remote_query(gpointer data)
	{
	if (data) {
	peer_device_info_t *query = data;

	crm_trace("Free'ing query result from %s", query->host);
	g_hash_table_destroy(query->devices);
	free(query->host);
	free(query);
	}
	}

	void
	free_stonith_remote_op_list()
	{
	if (stonith_remote_op_list != NULL) {
	g_hash_table_destroy(stonith_remote_op_list);
	stonith_remote_op_list = NULL;
	}
	}

	struct peer_count_data {
	const remote_fencing_op_t *op;
	gboolean verified_only;
	int count;
	};

	/*!
	* \internal
	* \brief Increment a counter if a device has not been executed yet
	*
	* \param[in] key Device ID (ignored)
	* \param[in] value Device properties
	* \param[in] user_data Peer count data
	*/
	static void
	count_peer_device(gpointer key, gpointer value, gpointer user_data)
	{
	device_properties_t props = (device_properties_t)value;
	struct peer_count_data *data = user_data;

	if (!props->executed[data->op->phase]
	&& (!data->verified_only \|\| props->verified)) {
	++(data->count);
	}
	}

	/*!
	* \internal
	* \brief Check the number of available devices in a peer's query results
	*
	* \param[in] op Operation that results are for
	* \param[in] peer Peer to count
	* \param[in] verified_only Whether to count only verified devices
	*
	* \return Number of devices available to peer that were not already executed
	*/
	static int
	count_peer_devices(const remote_fencing_op_t *op,
	const peer_device_info_t *peer, gboolean verified_only)
	{
	struct peer_count_data data;

	data.op = op;
	data.verified_only = verified_only;
	data.count = 0;
	if (peer) {
	g_hash_table_foreach(peer->devices, count_peer_device, &data);
	}
	return data.count;
	}

	/*!
	* \internal
	* \brief Search for a device in a query result
	*
	* \param[in] op Operation that result is for
	* \param[in] peer Query result for a peer
	* \param[in] device Device ID to search for
	*
	* \return Device properties if found, NULL otherwise
	*/
	static device_properties_t *
	find_peer_device(const remote_fencing_op_t op, const peer_device_info_t peer,
	const char *device)
	{
	device_properties_t *props = g_hash_table_lookup(peer->devices, device);

	return (props && !props->executed[op->phase]
	&& !props->disallowed[op->phase])? props : NULL;
	}

	/*!
	* \internal
	* \brief Find a device in a peer's device list and mark it as executed
	*
	* \param[in] op Operation that peer result is for
	* \param[in,out] peer Peer with results to search
	* \param[in] device ID of device to mark as done
	* \param[in] verified_devices_only Only consider verified devices
	*
	* \return TRUE if device was found and marked, FALSE otherwise
	*/
	static gboolean
	grab_peer_device(const remote_fencing_op_t op, peer_device_info_t peer,
	const char *device, gboolean verified_devices_only)
	{
	device_properties_t *props = find_peer_device(op, peer, device);

	if ((props == NULL) \|\| (verified_devices_only && !props->verified)) {
	return FALSE;
	}

	crm_trace("Removing %s from %s (%d remaining)",
	device, peer->host, count_peer_devices(op, peer, FALSE));
	props->executed[op->phase] = TRUE;
	return TRUE;
	}

	static void
	clear_remote_op_timers(remote_fencing_op_t * op)
	{
	if (op->query_timer) {
	g_source_remove(op->query_timer);
	op->query_timer = 0;
	}
	if (op->op_timer_total) {
	g_source_remove(op->op_timer_total);
	op->op_timer_total = 0;
	}
	if (op->op_timer_one) {
	g_source_remove(op->op_timer_one);
	op->op_timer_one = 0;
	}
	}

	static void
	free_remote_op(gpointer data)
	{
	remote_fencing_op_t *op = data;

	crm_log_xml_debug(op->request, "Destroying");

	clear_remote_op_timers(op);

	free(op->id);
	free(op->action);
	free(op->delegate);
	free(op->target);
	free(op->client_id);
	free(op->client_name);
	free(op->originator);

	if (op->query_results) {
	g_list_free_full(op->query_results, free_remote_query);
	}
	if (op->request) {
	free_xml(op->request);
	op->request = NULL;
	}
	if (op->devices_list) {
	g_list_free_full(op->devices_list, free);
	op->devices_list = NULL;
	}
	g_list_free_full(op->automatic_list, free);
	g_list_free(op->duplicates);
	free(op);
	}

	void
	init_stonith_remote_op_hash_table(GHashTable **table)
	{
	if (*table == NULL) {
	*table = pcmk__strkey_table(NULL, free_remote_op);
	}
	}

	/*!
	* \internal
	* \brief Return an operation's originally requested action (before any remap)
	*
	* \param[in] op Operation to check
	*
	* \return Operation's original action
	*/
	static const char *
	op_requested_action(const remote_fencing_op_t *op)
	{
	return ((op->phase > st_phase_requested)? "reboot" : op->action);
	}

	/*!
	* \internal
	* \brief Remap a "reboot" operation to the "off" phase
	*
	* \param[in,out] op Operation to remap
	*/
	static void
	op_phase_off(remote_fencing_op_t *op)
	{
	crm_info("Remapping multiple-device reboot targeting %s to 'off' "
	CRM_XS " id=%.8s", op->target, op->id);
	op->phase = st_phase_off;

	/* Happily, "off" and "on" are shorter than "reboot", so we can reuse the
	* memory allocation at each phase.
	*/
	strcpy(op->action, "off");
	}

	/*!
	* \internal
	* \brief Advance a remapped reboot operation to the "on" phase
	*
	* \param[in,out] op Operation to remap
	*/
	static void
	op_phase_on(remote_fencing_op_t *op)
	{
	GList *iter = NULL;

	crm_info("Remapped 'off' targeting %s complete, "
	"remapping to 'on' for %s " CRM_XS " id=%.8s",
	op->target, op->client_name, op->id);
	op->phase = st_phase_on;
	strcpy(op->action, "on");

	/* Skip devices with automatic unfencing, because the cluster will handle it
	* when the node rejoins.
	*/
	for (iter = op->automatic_list; iter != NULL; iter = iter->next) {
	GList *match = g_list_find_custom(op->devices_list, iter->data,
	sort_strings);

	if (match) {
	op->devices_list = g_list_remove(op->devices_list, match->data);
	}
	}
	g_list_free_full(op->automatic_list, free);
	op->automatic_list = NULL;

	/* Rewind device list pointer */
	op->devices = op->devices_list;
	}

	/*!
	* \internal
	* \brief Reset a remapped reboot operation
	*
	* \param[in,out] op Operation to reset
	*/
	static void
	undo_op_remap(remote_fencing_op_t *op)
	{
	if (op->phase > 0) {
	crm_info("Undoing remap of reboot targeting %s for %s "
	CRM_XS " id=%.8s", op->target, op->client_name, op->id);
	op->phase = st_phase_requested;
	strcpy(op->action, "reboot");
	}
	}

	static xmlNode *
	create_op_done_notify(remote_fencing_op_t * op, int rc)
	{
	xmlNode *notify_data = create_xml_node(NULL, T_STONITH_NOTIFY_FENCE);

	crm_xml_add_int(notify_data, "state", op->state);
	crm_xml_add_int(notify_data, F_STONITH_RC, rc);
	crm_xml_add(notify_data, F_STONITH_TARGET, op->target);
	crm_xml_add(notify_data, F_STONITH_ACTION, op->action);
	crm_xml_add(notify_data, F_STONITH_DELEGATE, op->delegate);
	crm_xml_add(notify_data, F_STONITH_REMOTE_OP_ID, op->id);
	crm_xml_add(notify_data, F_STONITH_ORIGIN, op->originator);
	crm_xml_add(notify_data, F_STONITH_CLIENTID, op->client_id);
	crm_xml_add(notify_data, F_STONITH_CLIENTNAME, op->client_name);

	return notify_data;
	}

	void
	stonith_bcast_result_to_peers(remote_fencing_op_t * op, int rc, gboolean op_merged)
	{
	static int count = 0;
	xmlNode *bcast = create_xml_node(NULL, T_STONITH_REPLY);
	xmlNode *notify_data = create_op_done_notify(op, rc);

	count++;
	crm_trace("Broadcasting result to peers");
	crm_xml_add(bcast, F_TYPE, T_STONITH_NOTIFY);
	crm_xml_add(bcast, F_SUBTYPE, "broadcast");
	crm_xml_add(bcast, F_STONITH_OPERATION, T_STONITH_NOTIFY);
	crm_xml_add_int(bcast, "count", count);

	if (op_merged) {
	pcmk__xe_set_bool_attr(bcast, F_STONITH_MERGED, true);
	}

	add_message_xml(bcast, F_STONITH_CALLDATA, notify_data);
	send_cluster_message(NULL, crm_msg_stonith_ng, bcast, FALSE);
	free_xml(notify_data);
	free_xml(bcast);

	return;
	}

	static void
	handle_local_reply_and_notify(remote_fencing_op_t * op, xmlNode * data, int rc)
	{
	xmlNode *notify_data = NULL;
	xmlNode *reply = NULL;

	if (op->notify_sent == TRUE) {
	/* nothing to do */
	return;
	}

	/* Do notification with a clean data object */
	notify_data = create_op_done_notify(op, rc);
	crm_xml_add_int(data, "state", op->state);
	crm_xml_add(data, F_STONITH_TARGET, op->target);
	crm_xml_add(data, F_STONITH_OPERATION, op->action);

	reply = stonith_construct_reply(op->request, NULL, data, rc);
	crm_xml_add(reply, F_STONITH_DELEGATE, op->delegate);

	/* Send fencing OP reply to local client that initiated fencing */
	do_local_reply(reply, op->client_id, op->call_options & st_opt_sync_call, FALSE);

	/* bcast to all local clients that the fencing operation happend */
	do_stonith_notify(T_STONITH_NOTIFY_FENCE, rc, notify_data);
	do_stonith_notify(T_STONITH_NOTIFY_HISTORY, pcmk_ok, NULL);

	/* mark this op as having notify's already sent */
	op->notify_sent = TRUE;
	free_xml(reply);
	free_xml(notify_data);
	}

	static void
	handle_duplicates(remote_fencing_op_t * op, xmlNode * data, int rc)
	{
	GList *iter = NULL;

	for (iter = op->duplicates; iter != NULL; iter = iter->next) {
	remote_fencing_op_t *other = iter->data;

	if (other->state == st_duplicate) {
	other->state = op->state;
	crm_debug("Performing duplicate notification for %s@%s: %s "
	CRM_XS " id=%.8s",
	other->client_name, other->originator,
	pcmk_strerror(rc), other->id);
	remote_op_done(other, data, rc, TRUE);

	} else {
	// Possible if (for example) it timed out already
	crm_err("Skipping duplicate notification for %s@%s "
	CRM_XS " state=%s id=%.8s",
	other->client_name, other->originator,
	stonith_op_state_str(other->state), other->id);
	}
	}
	}

	static char *
	delegate_from_xml(xmlNode *xml)
	{
	xmlNode *match = get_xpath_object("//@" F_STONITH_DELEGATE, xml, LOG_NEVER);

	if (match == NULL) {
	return crm_element_value_copy(xml, F_ORIG);
	} else {
	return crm_element_value_copy(match, F_STONITH_DELEGATE);
	}
	}

	/*!
	* \internal
	* \brief Finalize a remote operation.
	*
	* \description This function has two code paths.
	*
	* Path 1. This node is the owner of the operation and needs
	* to notify the cpg group via a broadcast as to the operation's
	* results.
	*
	* Path 2. The cpg broadcast is received. All nodes notify their local
	* stonith clients the operation results.
	*
	* So, The owner of the operation first notifies the cluster of the result,
	* and once that cpg notify is received back it notifies all the local clients.
	*
	* Nodes that are passive watchers of the operation will receive the
	* broadcast and only need to notify their local clients the operation finished.
	*
	* \param op, The fencing operation to finalize
	* \param data, The xml msg reply (if present) of the last delegated fencing
	* operation.
	* \param dup, Is this operation a duplicate, if so treat it a little differently
	* making sure the broadcast is not sent out.
	*/
	static void
	remote_op_done(remote_fencing_op_t * op, xmlNode * data, int rc, int dup)
	{
	int level = LOG_ERR;
	const char *subt = NULL;
	xmlNode *local_data = NULL;
	gboolean op_merged = FALSE;

	set_fencing_completed(op);
	clear_remote_op_timers(op);
	undo_op_remap(op);

	if (op->notify_sent == TRUE) {
	crm_err("Already sent notifications for '%s' targeting %s by %s for "
	"client %s@%s: %s " CRM_XS " rc=%d state=%s id=%.8s",
	op->action, op->target,
	(op->delegate? op->delegate : "unknown node"),
	op->client_name, op->originator, pcmk_strerror(rc),
	rc, stonith_op_state_str(op->state), op->id);
	goto remote_op_done_cleanup;
	}

	if (data == NULL) {
	data = create_xml_node(NULL, "remote-op");
	local_data = data;

	} else if (op->delegate == NULL) {
	switch (rc) {
	case -ENODEV:
	case -EHOSTUNREACH:
	break;
	default:
	op->delegate = delegate_from_xml(data);
	break;
	}
	}

	if(dup) {
	op_merged = TRUE;
	} else if (crm_element_value(data, F_STONITH_MERGED)) {
	op_merged = TRUE;
	}

	/* Tell everyone the operation is done, we will continue
	* with doing the local notifications once we receive
	* the broadcast back. */
	subt = crm_element_value(data, F_SUBTYPE);
	if (dup == FALSE && !pcmk__str_eq(subt, "broadcast", pcmk__str_casei)) {
	/* Defer notification until the bcast message arrives */
	stonith_bcast_result_to_peers(op, rc, (op_merged? TRUE: FALSE));
	goto remote_op_done_cleanup;
	}

	if (rc == pcmk_ok \|\| dup) {
	level = LOG_NOTICE;
	} else if (!pcmk__str_eq(op->originator, stonith_our_uname, pcmk__str_casei)) {
	level = LOG_NOTICE;
	}

	do_crm_log(level, "Operation '%s'%s%s by %s for %s@%s%s: %s "
	CRM_XS " id=%.8s", op->action, (op->target? " targeting " : ""),
	(op->target? op->target : ""),
	(op->delegate? op->delegate : "unknown node"),
	op->client_name, op->originator,
	(op_merged? " (merged)" : ""), pcmk_strerror(rc), op->id);

	handle_local_reply_and_notify(op, data, rc);

	if (dup == FALSE) {
	handle_duplicates(op, data, rc);
	}

	/* Free non-essential parts of the record
	* Keep the record around so we can query the history
	*/
	if (op->query_results) {
	g_list_free_full(op->query_results, free_remote_query);
	op->query_results = NULL;
	}

	if (op->request) {
	free_xml(op->request);
	op->request = NULL;
	}

	remote_op_done_cleanup:
	free_xml(local_data);
	}

	static gboolean
	remote_op_watchdog_done(gpointer userdata)
	{
	remote_fencing_op_t *op = userdata;

	op->op_timer_one = 0;

	crm_notice("Self-fencing (%s) by %s for %s assumed complete "
	CRM_XS " id=%.8s",
	op->action, op->target, op->client_name, op->id);
	op->state = st_done;
	remote_op_done(op, NULL, pcmk_ok, FALSE);
	return FALSE;
	}

	static gboolean
	remote_op_timeout_one(gpointer userdata)
	{
	remote_fencing_op_t *op = userdata;

	op->op_timer_one = 0;

	crm_notice("Peer's '%s' action targeting %s for client %s timed out " CRM_XS
	" id=%.8s", op->action, op->target, op->client_name, op->id);
	call_remote_stonith(op, NULL, -ETIME);
	return FALSE;
	}

	/*!
	* \internal
	* \brief Finalize a remote fencer operation that timed out
	*
	* \param[in] op Fencer operation that timed out
	*/
	static void
	finalize_timed_out_op(remote_fencing_op_t *op)
	{

	op->op_timer_total = 0;

	crm_debug("Action '%s' targeting %s for client %s timed out "
	CRM_XS " id=%.8s",
	op->action, op->target, op->client_name, op->id);

	if (op->phase == st_phase_on) {
	/* A remapped reboot operation timed out in the "on" phase, but the
	* "off" phase completed successfully, so quit trying any further
	* devices, and return success.
	*/
	op->state = st_done;
	remote_op_done(op, NULL, pcmk_ok, FALSE);
	return;
	}

	op->state = st_failed;

	remote_op_done(op, NULL, -ETIME, FALSE);
	}

	/*!
	* \internal
	* \brief Finalize a remote fencer operation that timed out
	*
	* \param[in] userdata Fencer operation that timed out
	*
	* \return G_SOURCE_REMOVE (which tells glib not to restart timer)
	*/
	static gboolean
	remote_op_timeout(gpointer userdata)
	{
	remote_fencing_op_t *op = userdata;

	if (op->state == st_done) {
	crm_debug("Action '%s' targeting %s for client %s already completed "
	CRM_XS " id=%.8s",
	op->action, op->target, op->client_name, op->id);
	} else {
	finalize_timed_out_op(userdata);
	}
	return G_SOURCE_REMOVE;
	}

	static gboolean
	remote_op_query_timeout(gpointer data)
	{
	remote_fencing_op_t *op = data;

	op->query_timer = 0;
	if (op->state == st_done) {
	crm_debug("Operation %.8s targeting %s already completed",
	op->id, op->target);
	} else if (op->state == st_exec) {
	crm_debug("Operation %.8s targeting %s already in progress",
	op->id, op->target);
	} else if (op->query_results) {
	crm_debug("Query %.8s targeting %s complete (state=%s)",
	op->id, op->target, stonith_op_state_str(op->state));
	call_remote_stonith(op, NULL, pcmk_ok);
	} else {
	crm_debug("Query %.8s targeting %s timed out (state=%s)",
	op->id, op->target, stonith_op_state_str(op->state));
	if (op->op_timer_total) {
	g_source_remove(op->op_timer_total);
	op->op_timer_total = 0;
	}
	finalize_timed_out_op(op);
	}

	return FALSE;
	}

	static gboolean
	topology_is_empty(stonith_topology_t *tp)
	{
	int i;

	if (tp == NULL) {
	return TRUE;
	}

	for (i = 0; i < ST_LEVEL_MAX; i++) {
	if (tp->levels[i] != NULL) {
	return FALSE;
	}
	}
	return TRUE;
	}

	/*!
	* \internal
	* \brief Add a device to an operation's automatic unfencing list
	*
	* \param[in,out] op Operation to modify
	* \param[in] device Device ID to add
	*/
	static void
	add_required_device(remote_fencing_op_t op, const char device)
	{
	GList *match = g_list_find_custom(op->automatic_list, device,
	sort_strings);

	if (!match) {
	op->automatic_list = g_list_prepend(op->automatic_list, strdup(device));
	}
	}

	/*!
	* \internal
	* \brief Remove a device from the automatic unfencing list
	*
	* \param[in,out] op Operation to modify
	* \param[in] device Device ID to remove
	*/
	static void
	remove_required_device(remote_fencing_op_t op, const char device)
	{
	GList *match = g_list_find_custom(op->automatic_list, device,
	sort_strings);

	if (match) {
	op->automatic_list = g_list_remove(op->automatic_list, match->data);
	}
	}

	/* deep copy the device list */
	static void
	set_op_device_list(remote_fencing_op_t * op, GList *devices)
	{
	GList *lpc = NULL;

	if (op->devices_list) {
	g_list_free_full(op->devices_list, free);
	op->devices_list = NULL;
	}
	for (lpc = devices; lpc != NULL; lpc = lpc->next) {
	op->devices_list = g_list_append(op->devices_list, strdup(lpc->data));
	}
	op->devices = op->devices_list;
	}

	/*!
	* \internal
	* \brief Check whether a node matches a topology target
	*
	* \param[in] tp Topology table entry to check
	* \param[in] node Name of node to check
	*
	* \return TRUE if node matches topology target
	*/
	static gboolean
	topology_matches(const stonith_topology_t tp, const char node)
	{
	regex_t r_patt;

	CRM_CHECK(node && tp && tp->target, return FALSE);
	switch(tp->kind) {
	case 2:
	/* This level targets by attribute, so tp->target is a NAME=VALUE pair
	* of a permanent attribute applied to targeted nodes. The test below
	* relies on the locally cached copy of the CIB, so if fencing needs to
	* be done before the initial CIB is received or after a malformed CIB
	* is received, then the topology will be unable to be used.
	*/
	if (node_has_attr(node, tp->target_attribute, tp->target_value)) {
	crm_notice("Matched %s with %s by attribute", node, tp->target);
	return TRUE;
	}
	break;
	case 1:
	/* This level targets by name, so tp->target is a regular expression
	* matching names of nodes to be targeted.
	*/

	if (regcomp(&r_patt, tp->target_pattern, REG_EXTENDED\|REG_NOSUB)) {
	crm_info("Bad regex '%s' for fencing level", tp->target);
	} else {
	int status = regexec(&r_patt, node, 0, NULL, 0);

	regfree(&r_patt);
	if (status == 0) {
	crm_notice("Matched %s with %s by name", node, tp->target);
	return TRUE;
	}
	}
	break;
	case 0:
	crm_trace("Testing %s against %s", node, tp->target);
	return pcmk__str_eq(tp->target, node, pcmk__str_casei);
	}
	crm_trace("No match for %s with %s", node, tp->target);
	return FALSE;
	}

	stonith_topology_t *
	find_topology_for_host(const char *host)
	{
	GHashTableIter tIter;
	stonith_topology_t *tp = g_hash_table_lookup(topology, host);

	if(tp != NULL) {
	crm_trace("Found %s for %s in %d entries", tp->target, host, g_hash_table_size(topology));
	return tp;
	}

	g_hash_table_iter_init(&tIter, topology);
	while (g_hash_table_iter_next(&tIter, NULL, (gpointer *) & tp)) {
	if (topology_matches(tp, host)) {
	crm_trace("Found %s for %s in %d entries", tp->target, host, g_hash_table_size(topology));
	return tp;
	}
	}

	crm_trace("No matches for %s in %d topology entries", host, g_hash_table_size(topology));
	return NULL;
	}

	/*!
	* \internal
	* \brief Set fencing operation's device list to target's next topology level
	*
	* \param[in,out] op Remote fencing operation to modify
	* \param[in] empty_ok If true, an operation without a target (i.e.
	* queries) or a target without a topology will get a
	* pcmk_rc_ok return value instead of ENODEV
	*
	* \return Standard Pacemaker return value
	*/
	static int
	advance_topology_level(remote_fencing_op_t *op, bool empty_ok)
	{
	stonith_topology_t *tp = NULL;

	if (op->target) {
	tp = find_topology_for_host(op->target);
	}
	if (topology_is_empty(tp)) {
	return empty_ok? pcmk_rc_ok : ENODEV;
	}

	CRM_ASSERT(tp->levels != NULL);

	stonith__set_call_options(op->call_options, op->id, st_opt_topology);

	/* This is a new level, so undo any remapping left over from previous */
	undo_op_remap(op);

	do {
	op->level++;

	} while (op->level < ST_LEVEL_MAX && tp->levels[op->level] == NULL);

	if (op->level < ST_LEVEL_MAX) {
	crm_trace("Attempting fencing level %d targeting %s (%d devices) "
	"for client %s@%s (id=%.8s)",
	op->level, op->target, g_list_length(tp->levels[op->level]),
	op->client_name, op->originator, op->id);
	set_op_device_list(op, tp->levels[op->level]);

	// The requested delay has been applied for the first fencing level
	if (op->level > 1 && op->delay > 0) {
	op->delay = 0;
	}

	if (g_list_next(op->devices_list) && pcmk__str_eq(op->action, "reboot", pcmk__str_casei)) {
	/* A reboot has been requested for a topology level with multiple
	* devices. Instead of rebooting the devices sequentially, we will
	* turn them all off, then turn them all on again. (Think about
	* switched power outlets for redundant power supplies.)
	*/
	op_phase_off(op);
	}
	return pcmk_rc_ok;
	}

	crm_notice("All fencing options targeting %s for client %s@%s failed "
	CRM_XS " id=%.8s",
	op->target, op->client_name, op->originator, op->id);
	return ENODEV;
	}

	/*!
	* \brief Check to see if this operation is a duplicate of another in flight
	* operation. If so merge this operation into the inflight operation, and mark
	* it as a duplicate.
	*/
	static void
	merge_duplicates(remote_fencing_op_t * op)
	{
	GHashTableIter iter;
	remote_fencing_op_t *other = NULL;

	time_t now = time(NULL);

	g_hash_table_iter_init(&iter, stonith_remote_op_list);
	while (g_hash_table_iter_next(&iter, NULL, (void **)&other)) {
	const char *other_action = op_requested_action(other);

	if (!strcmp(op->id, other->id)) {
	continue; // Don't compare against self
	}
	if (other->state > st_exec) {
	crm_trace("%.8s not duplicate of %.8s: not in progress",
	op->id, other->id);
	continue;
	}
	if (!pcmk__str_eq(op->target, other->target, pcmk__str_casei)) {
	crm_trace("%.8s not duplicate of %.8s: node %s vs. %s",
	op->id, other->id, op->target, other->target);
	continue;
	}
	if (!pcmk__str_eq(op->action, other_action, pcmk__str_casei)) {
	crm_trace("%.8s not duplicate of %.8s: action %s vs. %s",
	op->id, other->id, op->action, other_action);
	continue;
	}
	if (pcmk__str_eq(op->client_name, other->client_name, pcmk__str_casei)) {
	crm_trace("%.8s not duplicate of %.8s: same client %s",
	op->id, other->id, op->client_name);
	continue;
	}
	if (pcmk__str_eq(other->target, other->originator, pcmk__str_casei)) {
	crm_trace("%.8s not duplicate of %.8s: suicide for %s",
	op->id, other->id, other->target);
	continue;
	}
	if (!fencing_peer_active(crm_get_peer(0, other->originator))) {
	crm_notice("Failing action '%s' targeting %s originating from "
	"client %s@%s: Originator is dead " CRM_XS " id=%.8s",
	other->action, other->target, other->client_name,
	other->originator, other->id);
	crm_trace("%.8s not duplicate of %.8s: originator dead",
	op->id, other->id);
	other->state = st_failed;
	continue;
	}
	if ((other->total_timeout > 0)
	&& (now > (other->total_timeout + other->created))) {
	crm_trace("%.8s not duplicate of %.8s: old (%ld vs. %ld + %d)",
	op->id, other->id, now, other->created,
	other->total_timeout);
	continue;
	}

	/* There is another in-flight request to fence the same host
	* Piggyback on that instead. If it fails, so do we.
	*/
	other->duplicates = g_list_append(other->duplicates, op);
	if (other->total_timeout == 0) {
	other->total_timeout = op->total_timeout =
	TIMEOUT_MULTIPLY_FACTOR * get_op_total_timeout(op, NULL);
	crm_trace("Best guess as to timeout used for %.8s: %d",
	other->id, other->total_timeout);
	}
	crm_notice("Merging fencing action '%s' targeting %s originating from "
	"client %s with identical request from %s@%s "
	CRM_XS " original=%.8s duplicate=%.8s total_timeout=%ds",
	op->action, op->target, op->client_name,
	other->client_name, other->originator,
	op->id, other->id, other->total_timeout);
	report_timeout_period(op, other->total_timeout);
	op->state = st_duplicate;
	}
	}

	static uint32_t fencing_active_peers(void)
	{
	uint32_t count = 0;
	crm_node_t *entry;
	GHashTableIter gIter;

	g_hash_table_iter_init(&gIter, crm_peer_cache);
	while (g_hash_table_iter_next(&gIter, NULL, (void **)&entry)) {
	if(fencing_peer_active(entry)) {
	count++;
	}
	}
	return count;
	}

	+/*!
	+ * \internal
	+ * \brief Process a manual confirmation of a pending fence action
	+ *
	+ * \param[in] client IPC client that sent confirmation
	+ * \param[in] msg Request XML with manual confirmation
	+ *
	+ * \return Standard Pacemaker return code
	+ */
	int
	-stonith_manual_ack(xmlNode * msg, remote_fencing_op_t * op)
	+fenced_handle_manual_confirmation(pcmk__client_t client, xmlNode msg)
	{
	+ remote_fencing_op_t *op = NULL;
	xmlNode *dev = get_xpath_object("//@" F_STONITH_TARGET, msg, LOG_ERR);

	+ CRM_CHECK(dev != NULL, return EPROTO);
	+
	+ crm_notice("Received manual confirmation that %s has been fenced",
	+ crm_str(crm_element_value(dev, F_STONITH_TARGET)));
	+ op = initiate_remote_stonith_op(client, msg, TRUE);
	+ if (op == NULL) {
	+ return EPROTO;
	+ }
	op->state = st_done;
	set_fencing_completed(op);
	op->delegate = strdup("a human");

	- crm_notice("Injecting manual confirmation that %s is safely off/down",
	- crm_element_value(dev, F_STONITH_TARGET));
	+ // For the fencer's purposes, the fencing operation is done

	remote_op_done(op, msg, pcmk_ok, FALSE);

	- // Replies are sent via done_cb -> send_async_reply() -> do_local_reply()
	- return -EINPROGRESS;
	+ /* For the requester's purposes, the operation is still pending. The
	+ * actual result will be sent asynchronously via the operation's done_cb().
	+ */
	+ return EINPROGRESS;
	}

	/*!
	* \internal
	* \brief Create a new remote stonith operation
	*
	* \param[in] client ID of local stonith client that initiated the operation
	* \param[in] request The request from the client that started the operation
	* \param[in] peer TRUE if this operation is owned by another stonith peer
	* (an operation owned by one peer is stored on all peers,
	* but only the owner executes it; all nodes get the results
	* once the owner finishes execution)
	*/
	void *
	create_remote_stonith_op(const char client, xmlNode request, gboolean peer)
	{
	remote_fencing_op_t *op = NULL;
	xmlNode *dev = get_xpath_object("//@" F_STONITH_TARGET, request, LOG_NEVER);
	int call_options = 0;
	const char *operation = NULL;

	init_stonith_remote_op_hash_table(&stonith_remote_op_list);

	/* If this operation is owned by another node, check to make
	* sure we haven't already created this operation. */
	if (peer && dev) {
	const char *op_id = crm_element_value(dev, F_STONITH_REMOTE_OP_ID);

	CRM_CHECK(op_id != NULL, return NULL);

	op = g_hash_table_lookup(stonith_remote_op_list, op_id);
	if (op) {
	crm_debug("Reusing existing remote fencing op %.8s for %s",
	op_id, ((client == NULL)? "unknown client" : client));
	return op;
	}
	}

	op = calloc(1, sizeof(remote_fencing_op_t));
	CRM_ASSERT(op != NULL);

	crm_element_value_int(request, F_STONITH_TIMEOUT, &(op->base_timeout));
	// Value -1 means disable any static/random fencing delays
	crm_element_value_int(request, F_STONITH_DELAY, &(op->delay));

	if (peer && dev) {
	op->id = crm_element_value_copy(dev, F_STONITH_REMOTE_OP_ID);
	} else {
	op->id = crm_generate_uuid();
	}

	g_hash_table_replace(stonith_remote_op_list, op->id, op);

	op->state = st_query;
	op->replies_expected = fencing_active_peers();
	op->action = crm_element_value_copy(dev, F_STONITH_ACTION);
	op->originator = crm_element_value_copy(dev, F_STONITH_ORIGIN);
	op->delegate = crm_element_value_copy(dev, F_STONITH_DELEGATE); /* May not be set */
	op->created = time(NULL);

	if (op->originator == NULL) {
	/* Local or relayed request */
	op->originator = strdup(stonith_our_uname);
	}

	CRM_LOG_ASSERT(client != NULL);
	if (client) {
	op->client_id = strdup(client);
	}


	/* For a RELAY operation, set fenced on the client. */
	operation = crm_element_value(request, F_STONITH_OPERATION);

	if (pcmk__str_eq(operation, STONITH_OP_RELAY, pcmk__str_none)) {
	op->client_name = crm_strdup_printf("%s.%lu", crm_system_name,
	(unsigned long) getpid());
	} else {
	op->client_name = crm_element_value_copy(request, F_STONITH_CLIENTNAME);
	}

	op->target = crm_element_value_copy(dev, F_STONITH_TARGET);
	op->request = copy_xml(request); /* TODO: Figure out how to avoid this */
	crm_element_value_int(request, F_STONITH_CALLOPTS, &call_options);
	op->call_options = call_options;

	crm_element_value_int(request, F_STONITH_CALLID, &(op->client_callid));

	crm_trace("%s new fencing op %s ('%s' targeting %s for client %s, "
	"base timeout %d, %u %s expected)",
	(peer && dev)? "Recorded" : "Generated", op->id, op->action,
	op->target, op->client_name, op->base_timeout,
	op->replies_expected,
	pcmk__plural_alt(op->replies_expected, "reply", "replies"));

	if (op->call_options & st_opt_cs_nodeid) {
	int nodeid;
	crm_node_t *node;

	pcmk__scan_min_int(op->target, &nodeid, 0);
	node = pcmk__search_known_node_cache(nodeid, NULL, CRM_GET_PEER_ANY);

	/* Ensure the conversion only happens once */
	stonith__clear_call_options(op->call_options, op->id, st_opt_cs_nodeid);

	if (node && node->uname) {
	free(op->target);
	op->target = strdup(node->uname);

	} else {
	crm_warn("Could not expand nodeid '%s' into a host name", op->target);
	}
	}

	/* check to see if this is a duplicate operation of another in-flight operation */
	merge_duplicates(op);

	if (op->state != st_duplicate) {
	/* kick history readers */
	do_stonith_notify(T_STONITH_NOTIFY_HISTORY, pcmk_ok, NULL);
	}

	/* safe to trim as long as that doesn't touch pending ops */
	stonith_fence_history_trim();

	return op;
	}

	remote_fencing_op_t *
	initiate_remote_stonith_op(pcmk__client_t client, xmlNode request,
	gboolean manual_ack)
	{
	int query_timeout = 0;
	xmlNode *query = NULL;
	const char *client_id = NULL;
	remote_fencing_op_t *op = NULL;
	const char *relay_op_id = NULL;
	const char *operation = NULL;

	if (client) {
	client_id = client->id;
	} else {
	client_id = crm_element_value(request, F_STONITH_CLIENTID);
	}

	CRM_LOG_ASSERT(client_id != NULL);
	op = create_remote_stonith_op(client_id, request, FALSE);
	op->owner = TRUE;
	if (manual_ack) {
	crm_notice("Processing manual confirmation of fencing targeting %s "
	CRM_XS " id=%.8s", op->target, op->id);
	return op;
	}

	CRM_CHECK(op->action, return NULL);

	if (advance_topology_level(op, true) != pcmk_rc_ok) {
	op->state = st_failed;
	}

	switch (op->state) {
	case st_failed:
	crm_warn("Could not request peer fencing (%s) targeting %s "
	CRM_XS " id=%.8s", op->action, op->target, op->id);
	remote_op_done(op, NULL, -EINVAL, FALSE);
	return op;

	case st_duplicate:
	crm_info("Requesting peer fencing (%s) targeting %s (duplicate) "
	CRM_XS " id=%.8s", op->action, op->target, op->id);
	return op;

	default:
	crm_notice("Requesting peer fencing (%s) targeting %s "
	CRM_XS " id=%.8s state=%s base_timeout=%d",
	op->action, op->target, op->id,
	stonith_op_state_str(op->state), op->base_timeout);
	}

	query = stonith_create_op(op->client_callid, op->id, STONITH_OP_QUERY,
	NULL, op->call_options);

	crm_xml_add(query, F_STONITH_REMOTE_OP_ID, op->id);
	crm_xml_add(query, F_STONITH_TARGET, op->target);
	crm_xml_add(query, F_STONITH_ACTION, op_requested_action(op));
	crm_xml_add(query, F_STONITH_ORIGIN, op->originator);
	crm_xml_add(query, F_STONITH_CLIENTID, op->client_id);
	crm_xml_add(query, F_STONITH_CLIENTNAME, op->client_name);
	crm_xml_add_int(query, F_STONITH_TIMEOUT, op->base_timeout);

	/* In case of RELAY operation, RELAY information is added to the query to delete the original operation of RELAY. */
	operation = crm_element_value(request, F_STONITH_OPERATION);
	if (pcmk__str_eq(operation, STONITH_OP_RELAY, pcmk__str_none)) {
	relay_op_id = crm_element_value(request, F_STONITH_REMOTE_OP_ID);
	if (relay_op_id) {
	crm_xml_add(query, F_STONITH_REMOTE_OP_ID_RELAY, relay_op_id);
	}
	}

	send_cluster_message(NULL, crm_msg_stonith_ng, query, FALSE);
	free_xml(query);

	query_timeout = op->base_timeout * TIMEOUT_MULTIPLY_FACTOR;
	op->query_timer = g_timeout_add((1000 * query_timeout), remote_op_query_timeout, op);

	return op;
	}

	enum find_best_peer_options {
	/! Skip checking the target peer for capable fencing devices /
	FIND_PEER_SKIP_TARGET = 0x0001,
	/! Only check the target peer for capable fencing devices /
	FIND_PEER_TARGET_ONLY = 0x0002,
	/! Skip peers and devices that are not verified /
	FIND_PEER_VERIFIED_ONLY = 0x0004,
	};

	static peer_device_info_t *
	find_best_peer(const char device, remote_fencing_op_t op, enum find_best_peer_options options)
	{
	GList *iter = NULL;
	gboolean verified_devices_only = (options & FIND_PEER_VERIFIED_ONLY) ? TRUE : FALSE;

	if (!device && pcmk_is_set(op->call_options, st_opt_topology)) {
	return NULL;
	}

	for (iter = op->query_results; iter != NULL; iter = iter->next) {
	peer_device_info_t *peer = iter->data;

	crm_trace("Testing result from %s targeting %s with %d device%s: %d %x",
	peer->host, op->target, peer->ndevices,
	pcmk__plural_s(peer->ndevices), peer->tried, options);
	if ((options & FIND_PEER_SKIP_TARGET) && pcmk__str_eq(peer->host, op->target, pcmk__str_casei)) {
	continue;
	}
	if ((options & FIND_PEER_TARGET_ONLY) && !pcmk__str_eq(peer->host, op->target, pcmk__str_casei)) {
	continue;
	}

	if (pcmk_is_set(op->call_options, st_opt_topology)) {

	if (grab_peer_device(op, peer, device, verified_devices_only)) {
	return peer;
	}

	} else if ((peer->tried == FALSE)
	&& count_peer_devices(op, peer, verified_devices_only)) {

	/* No topology: Use the current best peer */
	crm_trace("Simple fencing");
	return peer;
	}
	}

	return NULL;
	}

	static peer_device_info_t *
	stonith_choose_peer(remote_fencing_op_t * op)
	{
	const char *device = NULL;
	peer_device_info_t *peer = NULL;
	uint32_t active = fencing_active_peers();

	do {
	if (op->devices) {
	device = op->devices->data;
	crm_trace("Checking for someone to fence (%s) %s using %s",
	op->action, op->target, device);
	} else {
	crm_trace("Checking for someone to fence (%s) %s",
	op->action, op->target);
	}

	/* Best choice is a peer other than the target with verified access */
	peer = find_best_peer(device, op, FIND_PEER_SKIP_TARGET\|FIND_PEER_VERIFIED_ONLY);
	if (peer) {
	crm_trace("Found verified peer %s for %s", peer->host, device?device:"<any>");
	return peer;
	}

	if(op->query_timer != 0 && op->replies < QB_MIN(op->replies_expected, active)) {
	crm_trace("Waiting before looking for unverified devices to fence %s", op->target);
	return NULL;
	}

	/* If no other peer has verified access, next best is unverified access */
	peer = find_best_peer(device, op, FIND_PEER_SKIP_TARGET);
	if (peer) {
	crm_trace("Found best unverified peer %s", peer->host);
	return peer;
	}

	/* If no other peer can do it, last option is self-fencing
	* (which is never allowed for the "on" phase of a remapped reboot)
	*/
	if (op->phase != st_phase_on) {
	peer = find_best_peer(device, op, FIND_PEER_TARGET_ONLY);
	if (peer) {
	crm_trace("%s will fence itself", peer->host);
	return peer;
	}
	}

	/* Try the next fencing level if there is one (unless we're in the "on"
	* phase of a remapped "reboot", because we ignore errors in that case)
	*/
	} while ((op->phase != st_phase_on)
	&& pcmk_is_set(op->call_options, st_opt_topology)
	&& (advance_topology_level(op, false) == pcmk_rc_ok));

	crm_notice("Couldn't find anyone to fence (%s) %s using %s",
	op->action, op->target, (device? device : "any device"));
	return NULL;
	}

	static int
	get_device_timeout(const remote_fencing_op_t *op,
	const peer_device_info_t peer, const char device)
	{
	device_properties_t *props;

	if (!peer \|\| !device) {
	return op->base_timeout;
	}

	props = g_hash_table_lookup(peer->devices, device);
	if (!props) {
	return op->base_timeout;
	}

	return (props->custom_action_timeout[op->phase]?
	props->custom_action_timeout[op->phase] : op->base_timeout)
	+ props->delay_max[op->phase];
	}

	struct timeout_data {
	const remote_fencing_op_t *op;
	const peer_device_info_t *peer;
	int total_timeout;
	};

	/*!
	* \internal
	* \brief Add timeout to a total if device has not been executed yet
	*
	* \param[in] key GHashTable key (device ID)
	* \param[in] value GHashTable value (device properties)
	* \param[in] user_data Timeout data
	*/
	static void
	add_device_timeout(gpointer key, gpointer value, gpointer user_data)
	{
	const char *device_id = key;
	device_properties_t *props = value;
	struct timeout_data *timeout = user_data;

	if (!props->executed[timeout->op->phase]
	&& !props->disallowed[timeout->op->phase]) {
	timeout->total_timeout += get_device_timeout(timeout->op,
	timeout->peer, device_id);
	}
	}

	static int
	get_peer_timeout(const remote_fencing_op_t op, const peer_device_info_t peer)
	{
	struct timeout_data timeout;

	timeout.op = op;
	timeout.peer = peer;
	timeout.total_timeout = 0;

	g_hash_table_foreach(peer->devices, add_device_timeout, &timeout);

	return (timeout.total_timeout? timeout.total_timeout : op->base_timeout);
	}

	static int
	get_op_total_timeout(const remote_fencing_op_t *op,
	const peer_device_info_t *chosen_peer)
	{
	int total_timeout = 0;
	stonith_topology_t *tp = find_topology_for_host(op->target);

	if (pcmk_is_set(op->call_options, st_opt_topology) && tp) {
	int i;
	GList *device_list = NULL;
	GList *iter = NULL;

	/* Yep, this looks scary, nested loops all over the place.
	* Here is what is going on.
	* Loop1: Iterate through fencing levels.
	* Loop2: If a fencing level has devices, loop through each device
	* Loop3: For each device in a fencing level, see what peer owns it
	* and what that peer has reported the timeout is for the device.
	*/
	for (i = 0; i < ST_LEVEL_MAX; i++) {
	if (!tp->levels[i]) {
	continue;
	}
	for (device_list = tp->levels[i]; device_list; device_list = device_list->next) {
	for (iter = op->query_results; iter != NULL; iter = iter->next) {
	const peer_device_info_t *peer = iter->data;

	if (find_peer_device(op, peer, device_list->data)) {
	total_timeout += get_device_timeout(op, peer,
	device_list->data);
	break;
	}
	} /* End Loop3: match device with peer that owns device, find device's timeout period */
	} /* End Loop2: iterate through devices at a specific level */
	} /End Loop1: iterate through fencing levels /

	} else if (chosen_peer) {
	total_timeout = get_peer_timeout(op, chosen_peer);
	} else {
	total_timeout = op->base_timeout;
	}

	return total_timeout ? total_timeout : op->base_timeout;
	}

	static void
	report_timeout_period(remote_fencing_op_t * op, int op_timeout)
	{
	GList *iter = NULL;
	xmlNode *update = NULL;
	const char *client_node = NULL;
	const char *client_id = NULL;
	const char *call_id = NULL;

	if (op->call_options & st_opt_sync_call) {
	/* There is no reason to report the timeout for a synchronous call. It
	* is impossible to use the reported timeout to do anything when the client
	* is blocking for the response. This update is only important for
	* async calls that require a callback to report the results in. */
	return;
	} else if (!op->request) {
	return;
	}

	crm_trace("Reporting timeout for %s (id=%.8s)", op->client_name, op->id);
	client_node = crm_element_value(op->request, F_STONITH_CLIENTNODE);
	call_id = crm_element_value(op->request, F_STONITH_CALLID);
	client_id = crm_element_value(op->request, F_STONITH_CLIENTID);
	if (!client_node \|\| !call_id \|\| !client_id) {
	return;
	}

	if (pcmk__str_eq(client_node, stonith_our_uname, pcmk__str_casei)) {
	/* The client is connected to this node, send the update direclty to them */
	do_stonith_async_timeout_update(client_id, call_id, op_timeout);
	return;
	}

	/* The client is connected to another node, relay this update to them */
	update = stonith_create_op(op->client_callid, op->id, STONITH_OP_TIMEOUT_UPDATE, NULL, 0);
	crm_xml_add(update, F_STONITH_REMOTE_OP_ID, op->id);
	crm_xml_add(update, F_STONITH_CLIENTID, client_id);
	crm_xml_add(update, F_STONITH_CALLID, call_id);
	crm_xml_add_int(update, F_STONITH_TIMEOUT, op_timeout);

	send_cluster_message(crm_get_peer(0, client_node), crm_msg_stonith_ng, update, FALSE);

	free_xml(update);

	for (iter = op->duplicates; iter != NULL; iter = iter->next) {
	remote_fencing_op_t *dup = iter->data;

	crm_trace("Reporting timeout for duplicate %.8s to client %s",
	dup->id, dup->client_name);
	report_timeout_period(iter->data, op_timeout);
	}
	}

	/*!
	* \internal
	* \brief Advance an operation to the next device in its topology
	*
	* \param[in,out] op Operation to advance
	* \param[in] device ID of device just completed
	* \param[in] msg XML reply that contained device result (if available)
	* \param[in] rc Return code of device's execution
	*/
	static void
	advance_topology_device_in_level(remote_fencing_op_t op, const char device,
	xmlNode *msg, int rc)
	{
	/* Advance to the next device at this topology level, if any */
	if (op->devices) {
	op->devices = op->devices->next;
	}

	/* Handle automatic unfencing if an "on" action was requested */
	if ((op->phase == st_phase_requested) && pcmk__str_eq(op->action, "on", pcmk__str_casei)) {
	/* If the device we just executed was required, it's not anymore */
	remove_required_device(op, device);

	/* If there are no more devices at this topology level, run through any
	* remaining devices with automatic unfencing
	*/
	if (op->devices == NULL) {
	op->devices = op->automatic_list;
	}
	}

	if ((op->devices == NULL) && (op->phase == st_phase_off)) {
	/* We're done with this level and with required devices, but we had
	* remapped "reboot" to "off", so start over with "on". If any devices
	* need to be turned back on, op->devices will be non-NULL after this.
	*/
	op_phase_on(op);
	}

	if (op->devices) {
	/* Necessary devices remain, so execute the next one */
	crm_trace("Next targeting %s on behalf of %s@%s (rc was %d)",
	op->target, op->client_name, op->originator, rc);

	// The requested delay has been applied for the first device
	if (op->delay > 0) {
	op->delay = 0;
	}

	call_remote_stonith(op, NULL, pcmk_ok);
	} else {
	/* We're done with all devices and phases, so finalize operation */
	crm_trace("Marking complex fencing op targeting %s as complete",
	op->target);
	op->state = st_done;
	remote_op_done(op, msg, rc, FALSE);
	}
	}

	static gboolean
	check_watchdog_fencing_and_wait(remote_fencing_op_t * op)
	{
	if (node_does_watchdog_fencing(op->target)) {

	crm_notice("Waiting %lds for %s to self-fence (%s) for "
	"client %s " CRM_XS " id=%.8s",
	(stonith_watchdog_timeout_ms / 1000),
	op->target, op->action, op->client_name, op->id);
	op->op_timer_one = g_timeout_add(stonith_watchdog_timeout_ms,
	remote_op_watchdog_done, op);
	return TRUE;
	} else {
	crm_debug("Skipping fallback to watchdog-fencing as %s is "
	"not in host-list", op->target);
	}
	return FALSE;
	}

	void
	call_remote_stonith(remote_fencing_op_t op, peer_device_info_t peer, int rc)
	{
	const char *device = NULL;
	int timeout = op->base_timeout;

	crm_trace("Action %.8s targeting %s for %s is %s",
	op->id, op->target, op->client_name,
	stonith_op_state_str(op->state));
	if ((peer == NULL) && !pcmk_is_set(op->call_options, st_opt_topology)) {
	peer = stonith_choose_peer(op);
	}

	if (!op->op_timer_total) {
	int total_timeout = get_op_total_timeout(op, peer);

	op->total_timeout = TIMEOUT_MULTIPLY_FACTOR * total_timeout;
	op->op_timer_total = g_timeout_add(1000 * op->total_timeout, remote_op_timeout, op);
	report_timeout_period(op, op->total_timeout);
	crm_info("Total timeout set to %d for peer's fencing targeting %s for %s"
	CRM_XS "id=%.8s",
	total_timeout, op->target, op->client_name, op->id);
	}

	if (pcmk_is_set(op->call_options, st_opt_topology) && op->devices) {
	/* Ignore any peer preference, they might not have the device we need */
	/* When using topology, stonith_choose_peer() removes the device from
	* further consideration, so be sure to calculate timeout beforehand */
	peer = stonith_choose_peer(op);

	device = op->devices->data;
	timeout = get_device_timeout(op, peer, device);
	}

	if (peer) {
	int timeout_one = 0;
	xmlNode *remote_op = stonith_create_op(op->client_callid, op->id, STONITH_OP_FENCE, NULL, 0);

	crm_xml_add(remote_op, F_STONITH_REMOTE_OP_ID, op->id);
	crm_xml_add(remote_op, F_STONITH_TARGET, op->target);
	crm_xml_add(remote_op, F_STONITH_ACTION, op->action);
	crm_xml_add(remote_op, F_STONITH_ORIGIN, op->originator);
	crm_xml_add(remote_op, F_STONITH_CLIENTID, op->client_id);
	crm_xml_add(remote_op, F_STONITH_CLIENTNAME, op->client_name);
	crm_xml_add_int(remote_op, F_STONITH_TIMEOUT, timeout);
	crm_xml_add_int(remote_op, F_STONITH_CALLOPTS, op->call_options);
	crm_xml_add_int(remote_op, F_STONITH_DELAY, op->delay);

	if (device) {
	timeout_one = TIMEOUT_MULTIPLY_FACTOR *
	get_device_timeout(op, peer, device);
	crm_notice("Requesting that %s perform '%s' action targeting %s "
	"using %s " CRM_XS " for client %s (%ds)",
	peer->host, op->action, op->target, device,
	op->client_name, timeout_one);
	crm_xml_add(remote_op, F_STONITH_DEVICE, device);

	} else {
	timeout_one = TIMEOUT_MULTIPLY_FACTOR * get_peer_timeout(op, peer);
	crm_notice("Requesting that %s perform '%s' action targeting %s "
	CRM_XS " for client %s (%ds, %lds)",
	peer->host, op->action, op->target, op->client_name,
	timeout_one, stonith_watchdog_timeout_ms);
	}

	op->state = st_exec;
	if (op->op_timer_one) {
	g_source_remove(op->op_timer_one);
	}

	if (!(stonith_watchdog_timeout_ms > 0 && (
	(pcmk__str_eq(device, STONITH_WATCHDOG_ID,
	pcmk__str_none)) \|\|
	(pcmk__str_eq(peer->host, op->target, pcmk__str_casei)
	&& !pcmk__str_eq(op->action, "on", pcmk__str_casei))) &&
	check_watchdog_fencing_and_wait(op))) {

	/* Some thoughts about self-fencing cases reaching this point:
	- Actually check in check_watchdog_fencing_and_wait
	shouldn't fail if STONITH_WATCHDOG_ID is
	chosen as fencing-device and it being present implies
	watchdog-fencing is enabled anyway
	- If watchdog-fencing is disabled either in general or for
	a specific target - detected in check_watchdog_fencing_and_wait -
	for some other kind of self-fencing we can't expect
	a success answer but timeout is fine if the node doesn't
	come back in between
	- Delicate might be the case where we have watchdog-fencing
	enabled for a node but the watchdog-fencing-device isn't
	explicitly chosen for suicide. Local pe-execution in sbd
	may detect the node as unclean and lead to timely suicide.
	Otherwise the selection of stonith-watchdog-timeout at
	least is questionable.
	*/
	op->op_timer_one = g_timeout_add((1000 * timeout_one), remote_op_timeout_one, op);
	}

	send_cluster_message(crm_get_peer(0, peer->host), crm_msg_stonith_ng, remote_op, FALSE);
	peer->tried = TRUE;
	free_xml(remote_op);
	return;

	} else if (op->phase == st_phase_on) {
	/* A remapped "on" cannot be executed, but the node was already
	* turned off successfully, so ignore the error and continue.
	*/
	crm_warn("Ignoring %s 'on' failure (no capable peers) targeting %s "
	"after successful 'off'", device, op->target);
	advance_topology_device_in_level(op, device, NULL, pcmk_ok);
	return;

	} else if (op->owner == FALSE) {
	crm_err("Fencing (%s) targeting %s for client %s is not ours to control",
	op->action, op->target, op->client_name);

	} else if (op->query_timer == 0) {
	/* We've exhausted all available peers */
	crm_info("No remaining peers capable of fencing (%s) %s for client %s "
	CRM_XS " state=%s", op->action, op->target, op->client_name,
	stonith_op_state_str(op->state));
	CRM_CHECK(op->state < st_done, return);
	finalize_timed_out_op(op);

	} else if(op->replies >= op->replies_expected \|\| op->replies >= fencing_active_peers()) {
	// int rc = -EHOSTUNREACH;

	/* if the operation never left the query state,
	* but we have all the expected replies, then no devices
	* are available to execute the fencing operation. */

	if(stonith_watchdog_timeout_ms > 0 && pcmk__str_eq(device,
	STONITH_WATCHDOG_ID, pcmk__str_null_matches)) {
	if (check_watchdog_fencing_and_wait(op)) {
	return;
	}
	}

	if (op->state == st_query) {
	crm_info("No peers (out of %d) have devices capable of fencing "
	"(%s) %s for client %s " CRM_XS " state=%s",
	op->replies, op->action, op->target, op->client_name,
	stonith_op_state_str(op->state));

	rc = -ENODEV;
	} else {
	if (pcmk_is_set(op->call_options, st_opt_topology)) {
	rc = -EHOSTUNREACH;
	}

	crm_info("No peers (out of %d) are capable of fencing (%s) %s "
	"for client %s " CRM_XS " state=%s",
	op->replies, op->action, op->target, op->client_name,
	stonith_op_state_str(op->state));
	}

	op->state = st_failed;
	remote_op_done(op, NULL, rc, FALSE);

	} else {
	crm_info("Waiting for additional peers capable of fencing (%s) %s%s%s "
	"for client %s " CRM_XS " id=%.8s",
	op->action, op->target, (device? " using " : ""),
	(device? device : ""), op->client_name, op->id);
	}
	}

	/*!
	* \internal
	* \brief Comparison function for sorting query results
	*
	* \param[in] a GList item to compare
	* \param[in] b GList item to compare
	*
	* \return Per the glib documentation, "a negative integer if the first value
	* comes before the second, 0 if they are equal, or a positive integer
	* if the first value comes after the second."
	*/
	static gint
	sort_peers(gconstpointer a, gconstpointer b)
	{
	const peer_device_info_t *peer_a = a;
	const peer_device_info_t *peer_b = b;

	return (peer_b->ndevices - peer_a->ndevices);
	}

	/*!
	* \internal
	* \brief Determine if all the devices in the topology are found or not
	*/
	static gboolean
	all_topology_devices_found(remote_fencing_op_t * op)
	{
	GList *device = NULL;
	GList *iter = NULL;
	device_properties_t *match = NULL;
	stonith_topology_t *tp = NULL;
	gboolean skip_target = FALSE;
	int i;

	tp = find_topology_for_host(op->target);
	if (!tp) {
	return FALSE;
	}
	if (pcmk__is_fencing_action(op->action)) {
	/* Don't count the devices on the target node if we are killing
	* the target node. */
	skip_target = TRUE;
	}

	for (i = 0; i < ST_LEVEL_MAX; i++) {
	for (device = tp->levels[i]; device; device = device->next) {
	match = NULL;
	for (iter = op->query_results; iter && !match; iter = iter->next) {
	peer_device_info_t *peer = iter->data;

	if (skip_target && pcmk__str_eq(peer->host, op->target, pcmk__str_casei)) {
	continue;
	}
	match = find_peer_device(op, peer, device->data);
	}
	if (!match) {
	return FALSE;
	}
	}
	}

	return TRUE;
	}

	/*!
	* \internal
	* \brief Parse action-specific device properties from XML
	*
	* \param[in] msg XML element containing the properties
	* \param[in] peer Name of peer that sent XML (for logs)
	* \param[in] device Device ID (for logs)
	* \param[in] action Action the properties relate to (for logs)
	* \param[in] phase Phase the properties relate to
	* \param[in,out] props Device properties to update
	*/
	static void
	parse_action_specific(xmlNode xml, const char peer, const char *device,
	const char action, remote_fencing_op_t op,
	enum st_remap_phase phase, device_properties_t *props)
	{
	props->custom_action_timeout[phase] = 0;
	crm_element_value_int(xml, F_STONITH_ACTION_TIMEOUT,
	&props->custom_action_timeout[phase]);
	if (props->custom_action_timeout[phase]) {
	crm_trace("Peer %s with device %s returned %s action timeout %d",
	peer, device, action, props->custom_action_timeout[phase]);
	}

	props->delay_max[phase] = 0;
	crm_element_value_int(xml, F_STONITH_DELAY_MAX, &props->delay_max[phase]);
	if (props->delay_max[phase]) {
	crm_trace("Peer %s with device %s returned maximum of random delay %d for %s",
	peer, device, props->delay_max[phase], action);
	}

	props->delay_base[phase] = 0;
	crm_element_value_int(xml, F_STONITH_DELAY_BASE, &props->delay_base[phase]);
	if (props->delay_base[phase]) {
	crm_trace("Peer %s with device %s returned base delay %d for %s",
	peer, device, props->delay_base[phase], action);
	}

	/* Handle devices with automatic unfencing */
	if (pcmk__str_eq(action, "on", pcmk__str_casei)) {
	int required = 0;

	crm_element_value_int(xml, F_STONITH_DEVICE_REQUIRED, &required);
	if (required) {
	crm_trace("Peer %s requires device %s to execute for action %s",
	peer, device, action);
	add_required_device(op, device);
	}
	}

	/* If a reboot is remapped to off+on, it's possible that a node is allowed
	* to perform one action but not another.
	*/
	if (pcmk__xe_attr_is_true(xml, F_STONITH_ACTION_DISALLOWED)) {
	props->disallowed[phase] = TRUE;
	crm_trace("Peer %s is disallowed from executing %s for device %s",
	peer, action, device);
	}
	}

	/*!
	* \internal
	* \brief Parse one device's properties from peer's XML query reply
	*
	* \param[in] xml XML node containing device properties
	* \param[in,out] op Operation that query and reply relate to
	* \param[in,out] peer Peer's device information
	* \param[in] device ID of device being parsed
	*/
	static void
	add_device_properties(xmlNode xml, remote_fencing_op_t op,
	peer_device_info_t peer, const char device)
	{
	xmlNode *child;
	int verified = 0;
	device_properties_t *props = calloc(1, sizeof(device_properties_t));

	/* Add a new entry to this peer's devices list */
	CRM_ASSERT(props != NULL);
	g_hash_table_insert(peer->devices, strdup(device), props);

	/* Peers with verified (monitored) access will be preferred */
	crm_element_value_int(xml, F_STONITH_DEVICE_VERIFIED, &verified);
	if (verified) {
	crm_trace("Peer %s has confirmed a verified device %s",
	peer->host, device);
	props->verified = TRUE;
	}

	/* Parse action-specific device properties */
	parse_action_specific(xml, peer->host, device, op_requested_action(op),
	op, st_phase_requested, props);
	for (child = pcmk__xml_first_child(xml); child != NULL;
	child = pcmk__xml_next(child)) {
	/* Replies for "reboot" operations will include the action-specific
	* values for "off" and "on" in child elements, just in case the reboot
	* winds up getting remapped.
	*/
	if (pcmk__str_eq(ID(child), "off", pcmk__str_casei)) {
	parse_action_specific(child, peer->host, device, "off",
	op, st_phase_off, props);
	} else if (pcmk__str_eq(ID(child), "on", pcmk__str_casei)) {
	parse_action_specific(child, peer->host, device, "on",
	op, st_phase_on, props);
	}
	}
	}

	/*!
	* \internal
	* \brief Parse a peer's XML query reply and add it to operation's results
	*
	* \param[in,out] op Operation that query and reply relate to
	* \param[in] host Name of peer that sent this reply
	* \param[in] ndevices Number of devices expected in reply
	* \param[in] xml XML node containing device list
	*
	* \return Newly allocated result structure with parsed reply
	*/
	static peer_device_info_t *
	add_result(remote_fencing_op_t op, const char host, int ndevices, xmlNode *xml)
	{
	peer_device_info_t *peer = calloc(1, sizeof(peer_device_info_t));
	xmlNode *child;

	// cppcheck seems not to understand the abort logic in CRM_CHECK
	// cppcheck-suppress memleak
	CRM_CHECK(peer != NULL, return NULL);
	peer->host = strdup(host);
	peer->devices = pcmk__strkey_table(free, free);

	/* Each child element describes one capable device available to the peer */
	for (child = pcmk__xml_first_child(xml); child != NULL;
	child = pcmk__xml_next(child)) {
	const char *device = ID(child);

	if (device) {
	add_device_properties(child, op, peer, device);
	}
	}

	peer->ndevices = g_hash_table_size(peer->devices);
	CRM_CHECK(ndevices == peer->ndevices,
	crm_err("Query claimed to have %d device%s but %d found",
	ndevices, pcmk__plural_s(ndevices), peer->ndevices));

	op->query_results = g_list_insert_sorted(op->query_results, peer, sort_peers);
	return peer;
	}

	/*!
	* \internal
	* \brief Handle a peer's reply to our fencing query
	*
	* Parse a query result from XML and store it in the remote operation
	* table, and when enough replies have been received, issue a fencing request.
	*
	* \param[in] msg XML reply received
	*
	* \return pcmk_ok on success, -errno on error
	*
	* \note See initiate_remote_stonith_op() for how the XML query was initially
	* formed, and stonith_query() for how the peer formed its XML reply.
	*/
	int
	process_remote_stonith_query(xmlNode * msg)
	{
	int ndevices = 0;
	gboolean host_is_target = FALSE;
	gboolean have_all_replies = FALSE;
	const char *id = NULL;
	const char *host = NULL;
	remote_fencing_op_t *op = NULL;
	peer_device_info_t *peer = NULL;
	uint32_t replies_expected;
	xmlNode *dev = get_xpath_object("//@" F_STONITH_REMOTE_OP_ID, msg, LOG_ERR);

	CRM_CHECK(dev != NULL, return -EPROTO);

	id = crm_element_value(dev, F_STONITH_REMOTE_OP_ID);
	CRM_CHECK(id != NULL, return -EPROTO);

	dev = get_xpath_object("//@" F_STONITH_AVAILABLE_DEVICES, msg, LOG_ERR);
	CRM_CHECK(dev != NULL, return -EPROTO);
	crm_element_value_int(dev, F_STONITH_AVAILABLE_DEVICES, &ndevices);

	op = g_hash_table_lookup(stonith_remote_op_list, id);
	if (op == NULL) {
	crm_debug("Received query reply for unknown or expired operation %s",
	id);
	return -EOPNOTSUPP;
	}

	replies_expected = fencing_active_peers();
	if (op->replies_expected < replies_expected) {
	replies_expected = op->replies_expected;
	}
	if ((++op->replies >= replies_expected) && (op->state == st_query)) {
	have_all_replies = TRUE;
	}
	host = crm_element_value(msg, F_ORIG);
	host_is_target = pcmk__str_eq(host, op->target, pcmk__str_casei);

	crm_info("Query result %d of %d from %s for %s/%s (%d device%s) %s",
	op->replies, replies_expected, host,
	op->target, op->action, ndevices, pcmk__plural_s(ndevices), id);
	if (ndevices > 0) {
	peer = add_result(op, host, ndevices, dev);
	}

	if (pcmk_is_set(op->call_options, st_opt_topology)) {
	/* If we start the fencing before all the topology results are in,
	* it is possible fencing levels will be skipped because of the missing
	* query results. */
	if (op->state == st_query && all_topology_devices_found(op)) {
	/* All the query results are in for the topology, start the fencing ops. */
	crm_trace("All topology devices found");
	call_remote_stonith(op, peer, pcmk_ok);

	} else if (have_all_replies) {
	crm_info("All topology query replies have arrived, continuing (%d expected/%d received) ",
	replies_expected, op->replies);
	call_remote_stonith(op, NULL, pcmk_ok);
	}

	} else if (op->state == st_query) {
	int nverified = count_peer_devices(op, peer, TRUE);

	/* We have a result for a non-topology fencing op that looks promising,
	* go ahead and start fencing before query timeout */
	if ((peer != NULL) && !host_is_target && nverified) {
	/* we have a verified device living on a peer that is not the target */
	crm_trace("Found %d verified device%s",
	nverified, pcmk__plural_s(nverified));
	call_remote_stonith(op, peer, pcmk_ok);

	} else if (have_all_replies) {
	crm_info("All query replies have arrived, continuing (%d expected/%d received) ",
	replies_expected, op->replies);
	call_remote_stonith(op, NULL, pcmk_ok);

	} else {
	crm_trace("Waiting for more peer results before launching fencing operation");
	}

	} else if ((peer != NULL) && (op->state == st_done)) {
	crm_info("Discarding query result from %s (%d device%s): "
	"Operation is %s", peer->host,
	peer->ndevices, pcmk__plural_s(peer->ndevices),
	stonith_op_state_str(op->state));
	}

	return pcmk_ok;
	}

	/*!
	* \internal
	* \brief Handle a peer's reply to a fencing request
	*
	* Parse a fencing reply from XML, and either finalize the operation
	* or attempt another device as appropriate.
	*
	* \param[in] msg XML reply received
	*
	* \return pcmk_ok on success, -errno on error
	*/
	int
	process_remote_stonith_exec(xmlNode * msg)
	{
	int rc = 0;
	const char *id = NULL;
	const char *device = NULL;
	remote_fencing_op_t *op = NULL;
	xmlNode *dev = get_xpath_object("//@" F_STONITH_REMOTE_OP_ID, msg, LOG_ERR);

	CRM_CHECK(dev != NULL, return -EPROTO);

	id = crm_element_value(dev, F_STONITH_REMOTE_OP_ID);
	CRM_CHECK(id != NULL, return -EPROTO);

	dev = get_xpath_object("//@" F_STONITH_RC, msg, LOG_ERR);
	CRM_CHECK(dev != NULL, return -EPROTO);

	crm_element_value_int(dev, F_STONITH_RC, &rc);

	device = crm_element_value(dev, F_STONITH_DEVICE);

	if (stonith_remote_op_list) {
	op = g_hash_table_lookup(stonith_remote_op_list, id);
	}

	if (op == NULL && rc == pcmk_ok) {
	/* Record successful fencing operations */
	const char *client_id = crm_element_value(dev, F_STONITH_CLIENTID);

	op = create_remote_stonith_op(client_id, dev, TRUE);
	}

	if (op == NULL) {
	/* Could be for an event that began before we started */
	/* TODO: Record the op for later querying */
	crm_info("Received peer result of unknown or expired operation %s", id);
	return -EOPNOTSUPP;
	}

	if (op->devices && device && !pcmk__str_eq(op->devices->data, device, pcmk__str_casei)) {
	crm_err("Received outdated reply for device %s (instead of %s) to "
	"fence (%s) %s. Operation already timed out at peer level.",
	device, (const char *) op->devices->data, op->action, op->target);
	return rc;
	}

	if (pcmk__str_eq(crm_element_value(msg, F_SUBTYPE), "broadcast", pcmk__str_casei)) {
	crm_debug("Finalizing action '%s' targeting %s on behalf of %s@%s: %s "
	CRM_XS " rc=%d id=%.8s",
	op->action, op->target, op->client_name, op->originator,
	pcmk_strerror(rc), rc, op->id);
	if (rc == pcmk_ok) {
	op->state = st_done;
	} else {
	op->state = st_failed;
	}
	remote_op_done(op, msg, rc, FALSE);
	return pcmk_ok;
	} else if (!pcmk__str_eq(op->originator, stonith_our_uname, pcmk__str_casei)) {
	/* If this isn't a remote level broadcast, and we are not the
	* originator of the operation, we should not be receiving this msg. */
	crm_err("Received non-broadcast fencing result for operation %.8s "
	"we do not own (device %s targeting %s)",
	op->id, device, op->target);
	return rc;
	}

	if (pcmk_is_set(op->call_options, st_opt_topology)) {
	const char *device = crm_element_value(msg, F_STONITH_DEVICE);

	crm_notice("Action '%s' targeting %s using %s on behalf of %s@%s: %s "
	CRM_XS " rc=%d",
	op->action, op->target, device, op->client_name,
	op->originator, pcmk_strerror(rc), rc);

	/* We own the op, and it is complete. broadcast the result to all nodes
	* and notify our local clients. */
	if (op->state == st_done) {
	remote_op_done(op, msg, rc, FALSE);
	return rc;
	}

	if ((op->phase == 2) && (rc != pcmk_ok)) {
	/* A remapped "on" failed, but the node was already turned off
	* successfully, so ignore the error and continue.
	*/
	crm_warn("Ignoring %s 'on' failure (exit code %d) targeting %s "
	"after successful 'off'", device, rc, op->target);
	rc = pcmk_ok;
	}

	if (rc == pcmk_ok) {
	/* An operation completed successfully. Try another device if
	* necessary, otherwise mark the operation as done. */
	advance_topology_device_in_level(op, device, msg, rc);
	return rc;
	} else {
	/* This device failed, time to try another topology level. If no other
	* levels are available, mark this operation as failed and report results. */
	if (advance_topology_level(op, false) != pcmk_rc_ok) {
	op->state = st_failed;
	remote_op_done(op, msg, rc, FALSE);
	return rc;
	}
	}
	} else if (rc == pcmk_ok && op->devices == NULL) {
	crm_trace("All done for %s", op->target);

	op->state = st_done;
	remote_op_done(op, msg, rc, FALSE);
	return rc;
	} else if (rc == -ETIME && op->devices == NULL) {
	/* If the operation timed out don't bother retrying other peers. */
	op->state = st_failed;
	remote_op_done(op, msg, rc, FALSE);
	return rc;
	} else {
	/* fall-through and attempt other fencing action using another peer */
	}

	/* Retry on failure */
	crm_trace("Next for %s on behalf of %s@%s (rc was %d)", op->target, op->originator,
	op->client_name, rc);
	call_remote_stonith(op, NULL, rc);
	return rc;
	}

	gboolean
	stonith_check_fence_tolerance(int tolerance, const char target, const char action)
	{
	GHashTableIter iter;
	time_t now = time(NULL);
	remote_fencing_op_t *rop = NULL;

	if (tolerance <= 0 \|\| !stonith_remote_op_list \|\| target == NULL \|\|
	action == NULL) {
	return FALSE;
	}

	g_hash_table_iter_init(&iter, stonith_remote_op_list);
	while (g_hash_table_iter_next(&iter, NULL, (void **)&rop)) {
	if (strcmp(rop->target, target) != 0) {
	continue;
	} else if (rop->state != st_done) {
	continue;
	/* We don't have to worry about remapped reboots here
	* because if state is done, any remapping has been undone
	*/
	} else if (strcmp(rop->action, action) != 0) {
	continue;
	} else if ((rop->completed + tolerance) < now) {
	continue;
	}

	crm_notice("Target %s was fenced (%s) less than %ds ago by %s on behalf of %s",
	target, action, tolerance, rop->delegate, rop->originator);
	return TRUE;
	}
	return FALSE;
	}
	diff --git a/daemons/fenced/pacemaker-fenced.h b/daemons/fenced/pacemaker-fenced.h
	index 3e41d867eb..cf88644f16 100644
	--- a/daemons/fenced/pacemaker-fenced.h
	+++ b/daemons/fenced/pacemaker-fenced.h
	@@ -1,272 +1,272 @@
	/*
	* Copyright 2009-2021 the Pacemaker project contributors
	*
	* This source code is licensed under the GNU General Public License version 2
	* or later (GPLv2+) WITHOUT ANY WARRANTY.
	*/

	#include <stdint.h> // uint32_t, uint64_t
	#include <crm/common/mainloop.h>

	/*!
	* \internal
	* \brief Check whether target has already been fenced recently
	*
	* \param[in] tolerance Number of seconds to look back in time
	* \param[in] target Name of node to search for
	* \param[in] action Action we want to match
	*
	* \return TRUE if an equivalent fencing operation took place in the last
	* \p tolerance seconds, FALSE otherwise
	*/
	gboolean stonith_check_fence_tolerance(int tolerance, const char target, const char action);

	typedef struct stonith_device_s {
	char *id;
	char *agent;
	char *namespace;

	/! list of actions that must execute on the target node. Used for unfencing /
	char *on_target_actions;
	GList *targets;
	time_t targets_age;
	gboolean has_attr_map;
	/* should nodeid parameter for victim be included in agent arguments */
	gboolean include_nodeid;
	/* whether the cluster should automatically unfence nodes with the device */
	gboolean automatic_unfencing;
	guint priority;

	uint32_t flags; // Group of enum st_device_flags

	GHashTable *params;
	GHashTable *aliases;
	GList *pending_ops;
	mainloop_timer_t *timer;
	crm_trigger_t *work;
	xmlNode *agent_metadata;

	/*! A verified device is one that has contacted the
	* agent successfully to perform a monitor operation */
	gboolean verified;

	gboolean cib_registered;
	gboolean api_registered;
	gboolean dirty;
	} stonith_device_t;

	/* These values are used to index certain arrays by "phase". Usually an
	* operation has only one "phase", so phase is always zero. However, some
	* reboots are remapped to "off" then "on", in which case "reboot" will be
	* phase 0, "off" will be phase 1 and "on" will be phase 2.
	*/
	enum st_remap_phase {
	st_phase_requested = 0,
	st_phase_off = 1,
	st_phase_on = 2,
	st_phase_max = 3
	};

	typedef struct remote_fencing_op_s {
	/* The unique id associated with this operation */
	char *id;
	/! The node this operation will fence /
	char *target;
	/! The fencing action to perform on the target. (reboot, on, off) /
	char *action;

	/! When was the fencing action recorded (seconds since epoch) /
	time_t created;

	/! Marks if the final notifications have been sent to local stonith clients. /
	gboolean notify_sent;
	/! The number of query replies received /
	guint replies;
	/! The number of query replies expected /
	guint replies_expected;
	/! Does this node own control of this operation /
	gboolean owner;
	/! After query is complete, This the high level timer that expires the entire operation /
	guint op_timer_total;
	/*! This timer expires the current fencing request. Many fencing
	* requests may exist in a single operation */
	guint op_timer_one;
	/*! This timer expires the query request sent out to determine
	* what nodes are contain what devices, and who those devices can fence */
	guint query_timer;
	/*! This is the default timeout to use for each fencing device if no
	* custom timeout is received in the query. */
	gint base_timeout;
	/*! This is the calculated total timeout an operation can take before
	* expiring. This is calculated by adding together all the timeout
	* values associated with the devices this fencing operation may call */
	gint total_timeout;

	/*! Requested fencing delay.
	* Value -1 means disable any static/random fencing delays. */
	int delay;

	/*! Delegate is the node being asked to perform a fencing action
	* on behalf of the node that owns the remote operation. Some operations
	* will involve multiple delegates. This value represents the final delegate
	* that is used. */
	char *delegate;
	/! The point at which the remote operation completed /
	time_t completed;
	//! Group of enum stonith_call_options associated with this operation
	uint32_t call_options;

	/*! The current state of the remote operation. This indicates
	* what stage the op is in, query, exec, done, duplicate, failed. */
	enum op_state state;
	/! The node that owns the remote operation /
	char *originator;
	/! The local client id that initiated the fencing request /
	char *client_id;
	/! The client's call_id that initiated the fencing request /
	int client_callid;
	/! The name of client that initiated the fencing request /
	char *client_name;
	/! List of the received query results for all the nodes in the cpg group /
	GList *query_results;
	/! The original request that initiated the remote stonith operation /
	xmlNode *request;

	/! The current topology level being executed /
	guint level;
	/! The current operation phase being executed /
	enum st_remap_phase phase;

	/! Devices with automatic unfencing (always run if "on" requested, never if remapped) /
	GList *automatic_list;
	/! List of all devices at the currently executing topology level /
	GList *devices_list;
	/! Current entry in the topology device list /
	GList *devices;

	/*! List of duplicate operations attached to this operation. Once this operation
	* completes, the duplicate operations will be closed out as well. */
	GList *duplicates;

	/! The point at which the remote operation completed(nsec) /
	long long completed_nsec;

	} remote_fencing_op_t;

	/*!
	* \internal
	* \brief Broadcast the result of an operation to the peers.
	* \param op, Operation whose result should be broadcast
	* \param rc, Result of the operation
	*/
	void stonith_bcast_result_to_peers(remote_fencing_op_t * op, int rc, gboolean op_merged);

	// Fencer-specific client flags
	enum st_client_flags {
	st_callback_unknown = UINT64_C(0),
	st_callback_notify_fence = (UINT64_C(1) << 0),
	st_callback_device_add = (UINT64_C(1) << 2),
	st_callback_device_del = (UINT64_C(1) << 4),
	st_callback_notify_history = (UINT64_C(1) << 5),
	st_callback_notify_history_synced = (UINT64_C(1) << 6)
	};

	/*
	* Complex fencing requirements are specified via fencing topologies.
	* A topology consists of levels; each level is a list of fencing devices.
	* Topologies are stored in a hash table by node name. When a node needs to be
	* fenced, if it has an entry in the topology table, the levels are tried
	* sequentially, and the devices in each level are tried sequentially.
	* Fencing is considered successful as soon as any level succeeds;
	* a level is considered successful if all its devices succeed.
	* Essentially, all devices at a given level are "and-ed" and the
	* levels are "or-ed".
	*
	* This structure is used for the topology table entries.
	* Topology levels start from 1, so levels[0] is unused and always NULL.
	*/
	typedef struct stonith_topology_s {
	int kind;

	/! Node name regex or attribute name=value for which topology applies /
	char *target;
	char *target_value;
	char *target_pattern;
	char *target_attribute;

	/! Names of fencing devices at each topology level /
	GList *levels[ST_LEVEL_MAX];

	} stonith_topology_t;

	void init_device_list(void);
	void free_device_list(void);
	void init_topology_list(void);
	void free_topology_list(void);
	void free_stonith_remote_op_list(void);
	void init_stonith_remote_op_hash_table(GHashTable **table);
	void free_metadata_cache(void);

	uint64_t get_stonith_flag(const char *name);

	void stonith_command(pcmk__client_t *client, uint32_t id, uint32_t flags,
	xmlNode op_request, const char remote_peer);

	int stonith_device_register(xmlNode * msg, const char **desc, gboolean from_cib);

	int stonith_device_remove(const char *id, gboolean from_cib);

	char stonith_level_key(xmlNode msg, int mode);
	int stonith_level_kind(xmlNode * msg);
	int stonith_level_register(xmlNode * msg, char **desc);

	int stonith_level_remove(xmlNode * msg, char **desc);

	stonith_topology_t find_topology_for_host(const char host);

	void do_local_reply(xmlNode * notify_src, const char *client_id, gboolean sync_reply,
	gboolean from_peer);

	xmlNode stonith_construct_reply(xmlNode request, const char output, xmlNode data,
	int rc);

	void
	do_stonith_async_timeout_update(const char client, const char call_id, int timeout);

	void do_stonith_notify(const char type, int result, xmlNode data);
	void do_stonith_notify_device(const char op, int rc, const char desc);
	void do_stonith_notify_level(const char op, int rc, const char desc);

	remote_fencing_op_t initiate_remote_stonith_op(pcmk__client_t client,
	xmlNode *request,
	gboolean manual_ack);

	int process_remote_stonith_exec(xmlNode * msg);

	int process_remote_stonith_query(xmlNode * msg);

	void create_remote_stonith_op(const char client, xmlNode * request, gboolean peer);

	int stonith_fence_history(xmlNode msg, xmlNode *output,
	const char *remote_peer, int options);

	void stonith_fence_history_trim(void);

	bool fencing_peer_active(crm_node_t *peer);

	void set_fencing_completed(remote_fencing_op_t * op);

	-int stonith_manual_ack(xmlNode * msg, remote_fencing_op_t * op);
	+int fenced_handle_manual_confirmation(pcmk__client_t client, xmlNode msg);

	gboolean node_has_attr(const char node, const char name, const char *value);

	gboolean node_does_watchdog_fencing(const char *node);

	extern char *stonith_our_uname;
	extern gboolean stand_alone;
	extern GHashTable *device_list;
	extern GHashTable *topology;
	extern long stonith_watchdog_timeout_ms;
	extern GList *stonith_watchdog_targets;

	extern GHashTable *stonith_remote_op_list;

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