commands.c
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commands.c
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	/*
	* Copyright (C) 2009 Andrew Beekhof <andrew@beekhof.net>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This software is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public
	* License along with this library; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#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/ipcs.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>

	#if SUPPORT_CIBSECRETS
	# include <crm/common/cib_secrets.h>
	#endif

	#include <internal.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) */
	GListPtr capable;
	};

	static gboolean stonith_device_dispatch(gpointer user_data);
	static void st_child_done(GPid pid, int rc, const char *output, gpointer 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);

	typedef struct async_command_s {

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

	int start_delay; /* milliseconds */
	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;
	char *mode;

	GListPtr device_list;
	GListPtr device_next;

	void *internal_user_data;
	void (done_cb) (GPid pid, int rc, const char output, gpointer 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;
	} async_command_t;

	static xmlNode stonith_construct_async_reply(async_command_t cmd, const char *output,
	xmlNode * data, int rc);

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

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

	if (safe_str_neq(action, "off") && safe_str_neq(action, "reboot")) {
	return 0;
	}

	value = g_hash_table_lookup(device->params, STONITH_ATTR_DELAY_MAX);
	if (value) {
	delay_max_ms = crm_get_msec(value);
	}

	return delay_max_ms;
	}

	/*!
	* \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 STONITH register_device() API instead of going through the CIB
	* (e.g. stonith_admin uses it for its -R option, and the LRMD uses it to
	* ensure a device is registered when a command is issued). As device
	* properties, pcmk_*_timeout parameters can be grabbed by stonithd 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 (safe_str_eq(action, "reboot")
	&& is_not_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) - 1, "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->mode);
	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;

	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->mode = crm_element_value_copy(op, F_STONITH_MODE);
	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, STONITH_ATTR_ACTION_LIMIT);
	if (value) {
	action_limit = crm_parse_int(value, "1");
	if (action_limit == 0) {
	/* pcmk_action_limit should not be 0. Enforce it to be 1. */
	action_limit = 1;
	}
	}

	return action_limit;
	}

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

	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, active_cmds > 1 ? "s" : "");
	return TRUE;
	}

	if (device->pending_ops) {
	GList *first = device->pending_ops;

	cmd = first->data;
	if (cmd && cmd->delay_id) {
	crm_trace
	("Operation %s%s%s on %s was asked to run too early, waiting for start_delay timeout of %dms",
	cmd->action, cmd->victim ? " for node " : "", cmd->victim ? cmd->victim : "",
	device->id, cmd->start_delay);
	return TRUE;
	}

	device->pending_ops = g_list_remove_link(device->pending_ops, first);
	g_list_free_1(first);
	}

	if (cmd == NULL) {
	crm_trace("Nothing further to do for %s", device->id);
	return TRUE;
	}

	if(safe_str_eq(device->agent, STONITH_WATCHDOG_AGENT)) {
	if(safe_str_eq(cmd->action, "reboot")) {
	pcmk_panic(__FUNCTION__);
	return TRUE;

	} else if(safe_str_eq(cmd->action, "off")) {
	pcmk_panic(__FUNCTION__);
	return TRUE;

	} else {
	crm_info("Faking success for %s watchdog operation", cmd->action);
	cmd->done_cb(0, 0, NULL, cmd);
	return TRUE;
	}
	}

	#if SUPPORT_CIBSECRETS
	if (replace_secret_params(device->id, device->params) < 0) {
	/* replacing secrets failed! */
	if (safe_str_eq(cmd->action,"stop")) {
	/* don't fail on stop! */
	crm_info("proceeding with the stop operation for %s", device->id);

	} else {
	crm_err("failed to get secrets for %s, "
	"considering resource not configured", device->id);
	exec_rc = PCMK_OCF_NOT_CONFIGURED;
	cmd->done_cb(0, exec_rc, NULL, cmd);
	return TRUE;
	}
	}
	#endif

	action_str = cmd->action;
	if (safe_str_eq(cmd->action, "reboot") && is_not_set(device->flags, st_device_supports_reboot)) {
	crm_warn("Agent '%s' does not advertise support for 'reboot', performing 'off' action instead", device->agent);
	action_str = "off";
	}

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

	/* for async exec, exec_rc is pid if positive and error code if negative/zero */
	exec_rc = stonith_action_execute_async(action, (void *)cmd, cmd->done_cb);

	if (exec_rc > 0) {
	crm_debug("Operation %s%s%s on %s now running with pid=%d, timeout=%ds",
	cmd->action, cmd->victim ? " for node " : "", cmd->victim ? cmd->victim : "",
	device->id, exec_rc, cmd->timeout);
	cmd->active_on = device;

	} else {
	crm_warn("Operation %s%s%s on %s failed: %s (%d)",
	cmd->action, cmd->victim ? " for node " : "", cmd->victim ? cmd->victim : "",
	device->id, pcmk_strerror(exec_rc), exec_rc);
	cmd->done_cb(0, exec_rc, NULL, cmd);
	}
	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;

	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 on %s for remote peer %s with op id (%s) (timeout=%ds)",
	cmd->action, device->id, cmd->origin, cmd->remote_op_id, cmd->timeout);
	} else {
	crm_debug("Scheduling %s on %s for %s (timeout=%ds)",
	cmd->action, device->id, cmd->client, cmd->timeout);
	}

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

	delay_max = get_action_delay_max(device, cmd->action);
	if (delay_max > 0) {
	cmd->start_delay = rand() % delay_max;
	crm_notice("Delaying %s on %s for %lldms (timeout=%ds)",
	cmd->action, device->id, cmd->start_delay, cmd->timeout);
	cmd->delay_id = g_timeout_add(cmd->start_delay, start_delay_helper, cmd);
	}
	}

	void
	free_device(gpointer data)
	{
	GListPtr 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);
	cmd->done_cb(0, -ENODEV, NULL, cmd);
	free_async_command(cmd);
	}
	g_list_free(device->pending_ops);

	g_list_free_full(device->targets, free);

	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);
	}

	static GHashTable *
	build_port_aliases(const char hostmap, GListPtr targets)
	{
	char *name = NULL;
	int last = 0, lpc = 0, max = 0, added = 0;
	GHashTable *aliases =
	g_hash_table_new_full(crm_strcase_hash, crm_strcase_equal, g_hash_destroy_str, g_hash_destroy_str);

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

	max = strlen(hostmap);
	for (; lpc <= max; lpc++) {
	switch (hostmap[lpc]) {
	/* 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;

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

	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;
	}

	static void
	parse_host_line(const char line, int max, GListPtr output)
	{
	int lpc = 0;
	int last = 0;

	if (max <= 0) {
	return;
	}

	/* Check for any complaints about additional parameters that the device doesn't understand */
	if (strstr(line, "invalid") \|\| strstr(line, "variable")) {
	crm_debug("Skipping: %s", line);
	return;
	}

	crm_trace("Processing %d bytes: [%s]", max, line);
	/* Skip initial whitespace */
	for (lpc = 0; lpc <= max && isspace(line[lpc]); lpc++) {
	last = lpc + 1;
	}

	/* Now the actual content */
	for (lpc = 0; lpc <= max; lpc++) {
	gboolean a_space = isspace(line[lpc]);

	if (a_space && lpc < max && isspace(line[lpc + 1])) {
	/* fast-forward to the end of the spaces */

	} else if (a_space \|\| line[lpc] == ',' \|\| line[lpc] == ';' \|\| line[lpc] == 0) {
	int rc = 1;
	char *entry = NULL;

	if (lpc != last) {
	entry = calloc(1, 1 + lpc - last);
	rc = sscanf(line + last, "%[a-zA-Z0-9_-.]", entry);
	}

	if (entry == NULL) {
	/* Skip */
	} else if (rc != 1) {
	crm_warn("Could not parse (%d %d): %s", last, lpc, line + last);
	} else if (safe_str_neq(entry, "on") && safe_str_neq(entry, "off")) {
	crm_trace("Adding '%s'", entry);
	output = g_list_append(output, entry);
	entry = NULL;
	}

	free(entry);
	last = lpc + 1;
	}
	}
	}

	static GListPtr
	parse_host_list(const char *hosts)
	{
	int lpc = 0;
	int max = 0;
	int last = 0;
	GListPtr output = NULL;

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

	max = strlen(hosts);
	for (lpc = 0; lpc <= max; lpc++) {
	if (hosts[lpc] == '\n' \|\| hosts[lpc] == 0) {
	char *line = NULL;
	int len = lpc - last;

	if(len > 1) {
	line = malloc(1 + len);
	}

	if(line) {
	snprintf(line, 1 + len, "%s", hosts + last);
	line[len] = 0; /* Because it might be '\n' */
	parse_host_line(line, len, &output);
	free(line);
	}

	last = lpc + 1;
	}
	}

	crm_trace("Parsed %d entries from '%s'", g_list_length(output), hosts);
	return output;
	}

	GHashTable *metadata_cache = NULL;

	static xmlNode *
	get_agent_metadata(const char *agent)
	{
	xmlNode *xml = NULL;
	char *buffer = NULL;

	if(metadata_cache == NULL) {
	metadata_cache = g_hash_table_new_full(
	crm_str_hash, g_str_equal, g_hash_destroy_str, g_hash_destroy_str);
	}

	buffer = g_hash_table_lookup(metadata_cache, agent);
	if(safe_str_eq(agent, STONITH_WATCHDOG_AGENT)) {
	return NULL;

	} else if(buffer == NULL) {
	stonith_t *st = stonith_api_new();
	int 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 NULL;
	}
	g_hash_table_replace(metadata_cache, strdup(agent), buffer);
	}

	xml = string2xml(buffer);

	return xml;
	}

	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;
	}

	static char *
	add_action(char actions, const char action)
	{
	static size_t len = 256;
	int offset = 0;

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

	if (offset > 0) {
	offset += snprintf(actions+offset, len-offset, " ");
	}
	offset += snprintf(actions+offset, 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 *on_target = NULL;
	const char *action = NULL;
	xmlNode *match = getXpathResult(xpath, lpc);

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

	on_target = crm_element_value(match, "on_target");
	action = crm_element_value(match, "name");

	if(safe_str_eq(action, "list")) {
	set_bit(device->flags, st_device_supports_list);
	} else if(safe_str_eq(action, "status")) {
	set_bit(device->flags, st_device_supports_status);
	} else if(safe_str_eq(action, "reboot")) {
	set_bit(device->flags, st_device_supports_reboot);
	} else if (safe_str_eq(action, "on")) {
	/* "automatic" means the cluster will unfence node when it joins */
	const char *automatic = crm_element_value(match, "automatic");

	/* "required" is a deprecated synonym for "automatic" */
	const char *required = crm_element_value(match, "required");

	if (crm_is_true(automatic) \|\| crm_is_true(required)) {
	device->automatic_unfencing = TRUE;
	}
	}

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

	freeXpathObject(xpath);
	}

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

	device = calloc(1, sizeof(stonith_device_t));
	device->id = crm_element_value_copy(dev, XML_ATTR_ID);
	device->agent = crm_element_value_copy(dev, "agent");
	device->namespace = crm_element_value_copy(dev, "namespace");
	device->params = xml2list(dev);

	value = g_hash_table_lookup(device->params, STONITH_ATTR_HOSTLIST);
	if (value) {
	device->targets = parse_host_list(value);
	}

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

	device->agent_metadata = get_agent_metadata(device->agent);
	read_action_metadata(device);

	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 (safe_str_eq(value, "unfencing")) {
	device->automatic_unfencing = TRUE;
	}

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

	if (device->on_target_actions) {
	crm_info("The fencing device '%s' requires actions (%s) to be executed on the target node",
	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 const char *
	target_list_type(stonith_device_t * dev)
	{
	const char *check_type = NULL;

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

	if (check_type == NULL) {

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

	return check_type;
	}

	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) (GPid pid, int rc, const char output,
	gpointer 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);
	}

	gboolean
	string_in_list(GListPtr list, const char *item)
	{
	int lpc = 0;
	int max = g_list_length(list);

	for (lpc = 0; lpc < max; lpc++) {
	const char *value = g_list_nth_data(list, lpc);

	if (safe_str_eq(item, value)) {
	return TRUE;
	} else {
	crm_trace("%d: '%s' != '%s'", lpc, item, value);
	}
	}
	return FALSE;
	}

	static void
	status_search_cb(GPid pid, int rc, const char *output, gpointer 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 (rc == 1 /* unknown */ ) {
	crm_trace("Host %s is not known by %s", search->host, dev->id);

	} else if (rc == 0 /* active / \|\| rc == 2 / inactive */ ) {
	crm_trace("Host %s is known by %s", search->host, dev->id);
	can = TRUE;

	} else {
	crm_notice("Unknown result when testing if %s can fence %s: rc=%d", dev->id, search->host,
	rc);
	}
	search_devices_record_result(search, dev->id, can);
	}

	static void
	dynamic_list_search_cb(GPid pid, int rc, const char *output, gpointer 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 we successfully got the targets earlier, don't disable. */
	if (rc != 0 && !dev->targets) {
	crm_notice("Disabling port list queries for %s (%d): %s", dev->id, rc, output);
	/* Fall back to status */
	g_hash_table_replace(dev->params, strdup(STONITH_ATTR_HOSTCHECK), strdup("status"));

	g_list_free_full(dev->targets, free);
	dev->targets = NULL;
	} else if (!rc) {
	crm_info("Refreshing port list for %s", dev->id);
	g_list_free_full(dev->targets, free);
	dev->targets = parse_host_list(output);
	dev->targets_age = time(NULL);
	}

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

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

	/*!
	* \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)
	{
	char *key = NULL;
	char *value = NULL;
	GHashTableIter gIter;
	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 (safe_str_neq(dup->agent, device->agent)) {
	crm_trace("Different agent: %s != %s", dup->agent, device->agent);
	return NULL;
	}

	/* Use calculate_operation_digest() here? */
	g_hash_table_iter_init(&gIter, device->params);
	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(dup->params, key);

	if (!other_value \|\| safe_str_neq(other_value, value)) {
	crm_trace("Different value for %s: %s != %s", key, other_value, value);
	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);

	dup = device_has_duplicate(device);
	if (dup) {
	crm_debug("Device '%s' already existed in device list (%d active devices)", device->id,
	g_hash_table_size(device_list));
	free_device(device);
	device = dup;

	} 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 an existing entry for %s from the 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);

	crm_notice("Added '%s' to the device list (%d active devices)", device->id,
	g_hash_table_size(device_list));
	}
	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);

	if (!device) {
	crm_info("Device '%s' not found (%d active devices)", id, g_hash_table_size(device_list));
	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);
	crm_info("Removed '%s' from the device list (%d active devices)",
	id, g_hash_table_size(device_list));
	}
	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;
	}

	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);
	}

	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 = NULL;

	line = calloc(1, 2 + lpc - last);
	snprintf(line, 1 + lpc - last, "%s", devices + 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 (safe_str_eq(TYPE(msg), XML_TAG_FENCING_LEVEL)) {
	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);

	crm_info("Target %s has %d active fencing levels",
	tp->target, count_active_levels(tp));
	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) {
	crm_info("Topology for %s not found (%d active entries)",
	target, g_hash_table_size(topology));

	} else if (id == 0 && g_hash_table_remove(topology, target)) {
	crm_info("Removed all %s related entries from the topology (%d active entries)",
	target, g_hash_table_size(topology));

	} else if (id > 0 && tp->levels[id] != NULL) {
	g_list_free_full(tp->levels[id], free);
	tp->levels[id] = NULL;

	crm_info("Removed level '%d' from topology for %s (%d active levels remaining)",
	id, target, count_active_levels(tp));
	}

	free(target);
	return pcmk_ok;
	}

	static int
	stonith_device_action(xmlNode * msg, char **output)
	{
	int rc = pcmk_ok;
	xmlNode *dev = get_xpath_object("//" F_STONITH_DEVICE, msg, LOG_ERR);
	const char *id = crm_element_value(dev, F_STONITH_DEVICE);

	async_command_t *cmd = NULL;
	stonith_device_t *device = NULL;

	if (id) {
	crm_trace("Looking for '%s'", id);
	device = g_hash_table_lookup(device_list, id);
	}

	if (device && device->api_registered == FALSE) {
	rc = -ENODEV;

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

	schedule_stonith_command(cmd, device);
	rc = -EINPROGRESS;

	} else {
	crm_info("Device %s not found", id ? id : "<none>");
	rc = -ENODEV;
	}
	return rc;
	}

	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) {

	crm_debug("Finished Search. %d devices can perform action (%s) on node %s",
	g_list_length(search->capable),
	search->action ? search->action : "<unknown>",
	search->host ? search->host : "<anyone>");

	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 = safe_str_eq(target, stonith_our_uname);

	if (device && action && device->on_target_actions
	&& strstr(device->on_target_actions, action)) {
	if (!localhost_is_target) {
	crm_trace("%s operation with %s can only be executed for localhost 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 (safe_str_eq(search->action, "reboot")) {
	/* 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 (safe_str_eq(check_type, "none")) {
	can = TRUE;

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

	/* 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 (string_in_list(dev->targets, host)) {
	can = TRUE;
	} else if (g_hash_table_lookup(dev->params, STONITH_ATTR_HOSTMAP)
	&& g_hash_table_lookup(dev->aliases, host)) {
	can = TRUE;
	}

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

	if (dev->targets == NULL \|\| dev->targets_age + 60 < now) {
	crm_trace("Running %s command to see if %s can fence %s (%s)",
	check_type, dev?dev->id:"N/A", search->host, search->action);

	schedule_internal_command(__FUNCTION__, 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 (string_in_list(dev->targets, alias)) {
	can = TRUE;
	}

	} else if (safe_str_eq(check_type, "status")) {
	crm_trace("Running %s command to see if %s can fence %s (%s)",
	check_type, dev?dev->id:"N/A", search->host, search->action);
	schedule_internal_command(__FUNCTION__, 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("Unknown check type: %s", check_type);
	}

	if (safe_str_eq(host, alias)) {
	crm_notice("%s can%s fence (%s) %s: %s", dev->id, can ? "" : " not", search->action, host, check_type);
	} else {
	crm_notice("%s can%s 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;
	int per_device_timeout = DEFAULT_QUERY_TIMEOUT;
	int devices_needing_async_query = 0;
	char *key = NULL;
	const char *check_type = NULL;
	GHashTableIter gIter;
	stonith_device_t *device = NULL;

	if (!g_hash_table_size(device_list)) {
	callback(NULL, user_data);
	return;
	}

	search = calloc(1, sizeof(struct device_search_s));
	if (!search) {
	callback(NULL, user_data);
	return;
	}

	g_hash_table_iter_init(&gIter, device_list);
	while (g_hash_table_iter_next(&gIter, (void )&key, (void )&device)) {
	check_type = target_list_type(device);
	if (safe_str_eq(check_type, "status") \|\| safe_str_eq(check_type, "dynamic-list")) {
	devices_needing_async_query++;
	}
	}

	/* If we have devices that require an async event in order to know what
	* nodes they can fence, we have to give the events a timeout. The total
	* query timeout is divided among those events. */
	if (devices_needing_async_query) {
	per_device_timeout = timeout / devices_needing_async_query;
	if (!per_device_timeout) {
	crm_err("STONITH timeout %ds is too low; using %ds, but consider raising to at least %ds",
	timeout, DEFAULT_QUERY_TIMEOUT,
	DEFAULT_QUERY_TIMEOUT * devices_needing_async_query);
	per_device_timeout = DEFAULT_QUERY_TIMEOUT;
	} else if (per_device_timeout < DEFAULT_QUERY_TIMEOUT) {
	crm_notice("STONITH timeout %ds is low for the current configuration;"
	" consider raising to at least %ds",
	timeout, DEFAULT_QUERY_TIMEOUT * devices_needing_async_query);
	}
	}

	search->host = host ? strdup(host) : NULL;
	search->action = action ? strdup(action) : NULL;
	search->per_device_timeout = per_device_timeout;
	/* We are guaranteed this many replies. Even if a device gets
	* unregistered some how during the async search, we will get
	* the correct number of replies. */
	search->replies_needed = g_hash_table_size(device_list);
	search->allow_suicide = suicide;
	search->callback = callback;
	search->user_data = user_data;
	/* kick off the search */

	crm_debug("Searching through %d devices to see what is capable of action (%s) for target %s",
	search->replies_needed,
	search->action ? search->action : "<unknown>",
	search->host ? search->host : "<anyone>");
	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
	*/
	static void
	add_action_specific_attributes(xmlNode xml, const char action,
	stonith_device_t *device)
	{
	int action_specific_timeout;
	int delay_max;

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

	if (is_action_required(action, device)) {
	crm_trace("Action %s is required on %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 on %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 on %s",
	action, delay_max, device->id);
	crm_xml_add_int(xml, F_STONITH_DELAY_MAX, delay_max / 1000);
	}
	}

	/*!
	* \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 on %s is disallowed for local host",
	action, device->id);
	crm_xml_add(xml, F_STONITH_ACTION_DISALLOWED, XML_BOOLEAN_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);
	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;
	GListPtr lpc = NULL;

	/* Pack the results into XML */
	list = create_xml_node(NULL, __FUNCTION__);
	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 stonithd wants to reboot the node, and we have a
	* capable device that doesn't support "reboot", remap to "off" instead.
	*/
	if (is_not_set(device->flags, st_device_supports_reboot)
	&& safe_str_eq(query->action, "reboot")) {
	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);
	if (safe_str_eq(query->action, "reboot")) {
	/* 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 stonithd 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,
	is_set(query->call_options, st_opt_allow_suicide));
	add_action_reply(dev, "off", device, query->target,
	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 devices for '%s'", available_devices, query->target);
	} else {
	crm_debug("%d devices installed", 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_DEBUG_3);

	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 && safe_str_eq(device, "manual_ack")) {
	/* 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,
	is_set(call_options, st_opt_allow_suicide),
	query, stonith_query_capable_device_cb);
	}

	#define ST_LOG_OUTPUT_MAX 512
	static void
	log_operation(async_command_t * cmd, int rc, int pid, const char next, const char output)
	{
	if (rc == 0) {
	next = NULL;
	}

	if (cmd->victim != NULL) {
	do_crm_log(rc == 0 ? LOG_NOTICE : LOG_ERR,
	"Operation '%s' [%d] (call %d from %s) for host '%s' with device '%s' returned: %d (%s)%s%s",
	cmd->action, pid, cmd->id, cmd->client_name, cmd->victim, cmd->device, rc,
	pcmk_strerror(rc), next ? ". Trying: " : "", next ? next : "");
	} else {
	do_crm_log_unlikely(rc == 0 ? LOG_DEBUG : LOG_NOTICE,
	"Operation '%s' [%d] for device '%s' returned: %d (%s)%s%s",
	cmd->action, pid, cmd->device, rc, pcmk_strerror(rc),
	next ? ". Trying: " : "", next ? next : "");
	}

	if (output) {
	/* Logging the whole string confuses syslog when the string is xml */
	char *prefix = crm_strdup_printf("%s:%d", cmd->device, pid);

	crm_log_output(rc == 0 ? LOG_DEBUG : LOG_WARNING, prefix, output);
	free(prefix);
	}
	}

	static void
	stonith_send_async_reply(async_command_t * cmd, const char *output, int rc, GPid pid)
	{
	xmlNode *reply = NULL;
	gboolean bcast = FALSE;

	reply = stonith_construct_async_reply(cmd, output, NULL, rc);

	if (safe_str_eq(cmd->action, "metadata")) {
	/* Too verbose to log */
	crm_trace("Metadata query for %s", cmd->device);
	output = NULL;

	} else if (crm_str_eq(cmd->action, "monitor", TRUE) \|\|
	crm_str_eq(cmd->action, "list", TRUE) \|\| crm_str_eq(cmd->action, "status", TRUE)) {
	crm_trace("Never broadcast %s replies", cmd->action);

	} else if (!stand_alone && safe_str_eq(cmd->origin, cmd->victim) && safe_str_neq(cmd->action, "on")) {
	crm_trace("Broadcast %s reply for %s", cmd->action, cmd->victim);
	crm_xml_add(reply, F_SUBTYPE, "broadcast");
	bcast = TRUE;
	}

	log_operation(cmd, rc, pid, NULL, output);
	crm_log_xml_trace(reply, "Reply");

	if (bcast) {
	crm_xml_add(reply, F_STONITH_OPERATION, T_STONITH_NOTIFY);
	send_cluster_message(NULL, crm_msg_stonith_ng, reply, FALSE);

	} else if (cmd->origin) {
	crm_trace("Directed reply to %s", cmd->origin);
	send_cluster_message(crm_get_peer(0, cmd->origin), crm_msg_stonith_ng, reply, FALSE);

	} else {
	crm_trace("Directed local %ssync reply to %s",
	(cmd->options & st_opt_sync_call) ? "" : "a-", cmd->client_name);
	do_local_reply(reply, cmd->client, cmd->options & st_opt_sync_call, FALSE);
	}

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

	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(0, T_STONITH_NOTIFY_FENCE, rc, notify_data);
	}

	free_xml(reply);
	}

	void
	unfence_cb(GPid pid, int rc, const char *output, gpointer user_data)
	{
	async_command_t * cmd = user_data;
	stonith_device_t *dev = g_hash_table_lookup(device_list, cmd->device);

	log_operation(cmd, rc, pid, NULL, output);

	cmd->active_on = NULL;

	if(dev) {
	mainloop_set_trigger(dev->work);
	} else {
	crm_trace("Device %s does not exist", cmd->device);
	}

	if(rc != 0) {
	crm_exit(DAEMON_RESPAWN_STOP);
	}
	}

	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 on %s", cmd->action, device->id);
	device->pending_ops = g_list_remove(device->pending_ops, cmd);
	}
	}

	static void
	st_child_done(GPid pid, int rc, const char *output, gpointer user_data)
	{
	stonith_device_t *device = NULL;
	stonith_device_t *next_device = NULL;
	async_command_t *cmd = user_data;

	GListPtr gIter = NULL;
	GListPtr 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 (rc == pcmk_ok &&
	(safe_str_eq(cmd->action, "list") \|\|
	safe_str_eq(cmd->action, "monitor") \|\| safe_str_eq(cmd->action, "status"))) {

	device->verified = TRUE;
	}

	mainloop_set_trigger(device->work);
	}

	crm_debug("Operation '%s' on '%s' completed with rc=%d (%d remaining)",
	cmd->action, cmd->device, rc, g_list_length(cmd->device_next));

	if (rc == 0) {
	GListPtr 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 (rc != 0 && cmd->device_next && (is_action_required(cmd->action, device) == FALSE)) {
	/* 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_operation(cmd, rc, pid, cmd->device, output);

	schedule_stonith_command(cmd, next_device);
	/* Prevent cmd from being freed */
	cmd = NULL;
	goto done;
	}

	stonith_send_async_reply(cmd, output, rc, pid);

	if (rc != 0) {
	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 (safe_str_eq(cmd->client, cmd_other->client) \|\|
	safe_str_neq(cmd->victim, cmd_other->victim) \|\|
	safe_str_neq(cmd->action, cmd_other->action) \|\|
	safe_str_neq(cmd->device, cmd_other->device)) {

	continue;
	}

	/* Duplicate merging will do the right thing for either type of remapped
	* reboot. If the executing stonithd remapped an unsupported reboot to
	* off, then cmd->action will be reboot and will be merged with any
	* other reboot requests. If the originating stonithd 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 stonith action %s for node %s originating from client %s with identical stonith 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);

	stonith_send_async_reply(cmd_other, output, rc, pid);
	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;

	crm_info("Found %d matching devices for '%s'", g_list_length(devices), cmd->victim);

	if (g_list_length(devices) > 0) {
	/* Order based on priority */
	devices = g_list_sort(devices, sort_device_priority);
	device = g_hash_table_lookup(device_list, devices->data);

	if (device) {
	cmd->device_list = devices;
	cmd->device_next = devices->next;
	devices = NULL; /* list owned by cmd now */
	}
	}

	/* we have a device, schedule it for fencing. */
	if (device) {
	schedule_stonith_command(cmd, device);
	/* in progress */
	return;
	}

	/* no device found! */
	stonith_send_async_reply(cmd, NULL, -ENODEV, 0);

	free_async_command(cmd);
	g_list_free_full(devices, free);
	}

	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);
	char *nodename = NULL;

	if (cmd->options & st_opt_cs_nodeid) {
	int nodeid = crm_atoi(host, NULL);

	nodename = stonith_get_peer_name(nodeid);
	if (nodename) {
	host = nodename;
	}
	}

	/* 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);

	free(nodename);
	}

	return -EINPROGRESS;
	}

	xmlNode *
	stonith_construct_reply(xmlNode * request, const char output, xmlNode data, int rc)
	{
	int lpc = 0;
	xmlNode *reply = NULL;

	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 basic reply");
	reply = create_xml_node(NULL, T_STONITH_REPLY);

	crm_xml_add(reply, "st_origin", __FUNCTION__);
	crm_xml_add(reply, F_TYPE, T_STONITH_NG);
	crm_xml_add(reply, "st_output", output);
	crm_xml_add_int(reply, F_STONITH_RC, rc);

	CRM_CHECK(request != NULL, crm_warn("Can't create a sane reply"); return reply);
	for (lpc = 0; lpc < DIMOF(names); lpc++) {
	name = names[lpc];
	value = crm_element_value(request, name);
	crm_xml_add(reply, name, value);
	}

	if (data != NULL) {
	crm_trace("Attaching reply output");
	add_message_xml(reply, F_STONITH_CALLDATA, data);
	}
	return reply;
	}

	static xmlNode *
	stonith_construct_async_reply(async_command_t * cmd, const char output, xmlNode data, int rc)
	{
	xmlNode *reply = NULL;

	crm_trace("Creating a basic reply");
	reply = create_xml_node(NULL, T_STONITH_REPLY);

	crm_xml_add(reply, "st_origin", __FUNCTION__);
	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, rc);

	crm_xml_add(reply, "st_output", output);

	if (data != NULL) {
	crm_info("Attaching reply output");
	add_message_xml(reply, F_STONITH_CALLDATA, data);
	}
	return reply;
	}

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

	/*!
	* \internal
	* \brief Determine if we need to use an alternate node to
	* fence the target. If so return that node's uname
	*
	* \retval NULL, no alternate host
	* \retval uname, uname of alternate host to use
	*/
	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) && safe_str_eq(target, stonith_our_uname)) {
	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)
	&& safe_str_neq(entry->uname, target)) {
	alternate_host = entry->uname;
	break;
	}
	}
	if (alternate_host == NULL) {
	crm_err("No alternate host available to handle complex self fencing request");
	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;
	}

	static void
	stonith_send_reply(xmlNode * reply, int call_options, const char *remote_peer,
	const char *client_id)
	{
	if (remote_peer) {
	send_cluster_message(crm_get_peer(0, remote_peer), crm_msg_stonith_ng, reply, FALSE);
	} else {
	do_local_reply(reply, client_id, is_set(call_options, st_opt_sync_call), remote_peer != NULL);
	}
	}

	static int
	handle_request(crm_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;

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

	if (crm_str_eq(op, CRM_OP_REGISTER, TRUE)) {
	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);
	crm_ipcs_send(client, id, reply, flags);
	client->request_id = 0;
	free_xml(reply);
	return 0;

	} else if (crm_str_eq(op, STONITH_OP_EXEC, TRUE)) {
	rc = stonith_device_action(request, &output);

	} else if (crm_str_eq(op, STONITH_OP_TIMEOUT_UPDATE, TRUE)) {
	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);
	return 0;

	} else if (crm_str_eq(op, STONITH_OP_QUERY, TRUE)) {
	if (remote_peer) {
	create_remote_stonith_op(client_id, request, TRUE); /* Record it for the future notification */
	}
	stonith_query(request, remote_peer, client_id, call_options);
	return 0;

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

	CRM_ASSERT(client);
	flag_name = crm_element_value(request, F_STONITH_NOTIFY_ACTIVATE);
	if (flag_name) {
	crm_debug("Setting %s callbacks for %s (%s): ON", flag_name, client->name, client->id);
	client->options \|= get_stonith_flag(flag_name);
	}

	flag_name = crm_element_value(request, F_STONITH_NOTIFY_DEACTIVATE);
	if (flag_name) {
	crm_debug("Setting %s callbacks for %s (%s): off", flag_name, client->name, client->id);
	client->options \|= get_stonith_flag(flag_name);
	}

	if (flags & crm_ipc_client_response) {
	crm_ipcs_send_ack(client, id, flags, "ack", __FUNCTION__, __LINE__);
	}
	return 0;

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

	crm_notice("Peer %s has received a forwarded fencing request from %s to fence (%s) peer %s",
	stonith_our_uname,
	client ? client->name : remote_peer,
	crm_element_value(dev, F_STONITH_ACTION),
	crm_element_value(dev, F_STONITH_TARGET));

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

	} else if (crm_str_eq(op, STONITH_OP_FENCE, TRUE)) {

	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 {
	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.%.8s wants to fence (%s) '%s' with device '%s'",
	client->name, client->id, action, target, device ? device : "(any)");

	crm_element_value_int(dev, F_STONITH_TOLERANCE, &tolerance);

	if (stonith_check_fence_tolerance(tolerance, target, action)) {
	rc = 0;
	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;

	crm_notice("Forwarding complex self fencing request to peer %s", alternate_host);

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

	/* Create a record of it, otherwise call_id will be 0 if we need to notify of failures */
	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);
	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 = -EINPROGRESS;
	}
	}

	} else if (crm_str_eq(op, STONITH_OP_FENCE_HISTORY, TRUE)) {
	rc = stonith_fence_history(request, &data);

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

	rc = stonith_device_register(request, &device_id, FALSE);
	do_stonith_notify_device(call_options, op, rc, device_id);

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

	rc = stonith_device_remove(device_id, FALSE);
	do_stonith_notify_device(call_options, op, rc, device_id);

	} else if (crm_str_eq(op, STONITH_OP_LEVEL_ADD, TRUE)) {
	char *device_id = NULL;

	rc = stonith_level_register(request, &device_id);
	do_stonith_notify_level(call_options, op, rc, device_id);
	free(device_id);

	} else if (crm_str_eq(op, STONITH_OP_LEVEL_DEL, TRUE)) {
	char *device_id = NULL;

	rc = stonith_level_remove(request, &device_id);
	do_stonith_notify_level(call_options, op, rc, device_id);

	} else if (crm_str_eq(op, STONITH_OP_CONFIRM, TRUE)) {
	async_command_t *cmd = create_async_command(request);
	xmlNode *reply = stonith_construct_async_reply(cmd, NULL, NULL, 0);

	crm_xml_add(reply, F_STONITH_OPERATION, T_STONITH_NOTIFY);
	crm_notice("Broadcasting manual fencing confirmation for node %s", cmd->victim);
	send_cluster_message(NULL, crm_msg_stonith_ng, reply, FALSE);

	free_async_command(cmd);
	free_xml(reply);

	} else if(safe_str_eq(op, CRM_OP_RM_NODE_CACHE)) {
	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);

	return pcmk_ok;

	} else {
	crm_err("Unknown %s from %s", op, client ? client->name : remote_peer);
	crm_log_xml_warn(request, "UnknownOp");
	}

	done:

	/* Always reply unless the request is in process still.
	* If in progress, a reply will happen async after the request
	* processing is finished */
	if (rc != -EINPROGRESS) {
	crm_trace("Reply handling: %p %u %u %d %d %s", client, client?client->request_id:0,
	id, is_set(call_options, st_opt_sync_call), call_options,
	crm_element_value(request, F_STONITH_CALLOPTS));

	if (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);

	return rc;
	}

	static void
	handle_reply(crm_client_t * client, xmlNode * request, const char *remote_peer)
	{
	const char *op = crm_element_value(request, F_STONITH_OPERATION);

	if (crm_str_eq(op, STONITH_OP_QUERY, TRUE)) {
	process_remote_stonith_query(request);
	} else if (crm_str_eq(op, T_STONITH_NOTIFY, TRUE)) {
	process_remote_stonith_exec(request);
	} else if (crm_str_eq(op, STONITH_OP_FENCE, TRUE)) {
	/* Reply to a complex fencing op */
	process_remote_stonith_exec(request);
	} else {
	crm_err("Unknown %s reply from %s", op, client ? client->name : remote_peer);
	crm_log_xml_warn(request, "UnknownOp");
	}
	}

	void
	stonith_command(crm_client_t * client, uint32_t id, uint32_t flags, xmlNode * request,
	const char *remote_peer)
	{
	int call_options = 0;
	int rc = 0;
	gboolean is_reply = FALSE;

	/* Copy op for reporting. The original might get freed by handle_reply()
	* before we use it in crm_debug():
	* handle_reply()
	* \|- process_remote_stonith_exec()
	* \|-- remote_op_done()
	* \|--- handle_local_reply_and_notify()
	* \|---- crm_xml_add(...F_STONITH_OPERATION...)
	* \|--- free_xml(op->request)
	*/
	char *op = crm_element_value_copy(request, F_STONITH_OPERATION);

	if (get_xpath_object("//" T_STONITH_REPLY, request, LOG_DEBUG_3)) {
	is_reply = TRUE;
	}

	crm_element_value_int(request, F_STONITH_CALLOPTS, &call_options);
	crm_debug("Processing %s%s %u from %s (%16x)", op, is_reply ? " reply" : "",
	id, client ? client->name : remote_peer, call_options);

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

	if (is_reply) {
	handle_reply(client, request, remote_peer);
	} else {
	rc = handle_request(client, id, flags, request, remote_peer);
	}

	crm_debug("Processed %s%s from %s: %s (%d)", op,
	is_reply ? " reply" : "", client ? client->name : remote_peer,
	rc > 0 ? "" : pcmk_strerror(rc), rc);

	free(op);
	}

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