pcmk_cluster_queries.c
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pcmk_cluster_queries.c
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	/*
	* Copyright 2020-2024 the Pacemaker project contributors
	*
	* The version control history for this file may have further details.
	*
	* This source code is licensed under the GNU Lesser General Public License
	* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
	*/

	#include <crm_internal.h>

	#include <libxml/tree.h> // xmlNode

	#include <pacemaker.h>
	#include <pacemaker-internal.h>

	#include <crm/crm.h>
	#include <crm/cib.h>
	#include <crm/cib/internal.h>
	#include <crm/common/output_internal.h>
	#include <crm/common/xml.h>
	#include <crm/common/xml_internal.h>
	#include <crm/common/iso8601.h>
	#include <crm/common/ipc_controld.h>
	#include <crm/common/ipc_pacemakerd.h>

	//! Object to store node info from the controller API
	typedef struct {
	/* Adapted from pcmk_controld_api_reply_t:data:node_info.
	* (char **) are convenient here for use within callbacks: we can skip
	* copying strings unless the caller passes a non-NULL value.
	*/
	uint32_t id;
	char **node_name;
	char **uuid;
	char **state;
	bool have_quorum;
	bool is_remote;
	} node_info_t;

	//! Object to store API results, a timeout, and an output object
	typedef struct {
	pcmk__output_t *out;
	bool show_output;
	int rc;
	unsigned int message_timeout_ms;
	enum pcmk_pacemakerd_state pcmkd_state;
	node_info_t node_info;
	} data_t;

	/*!
	* \internal
	* \brief Validate that an IPC API event is a good reply
	*
	* \param[in,out] data API results and options
	* \param[in] api IPC API connection
	* \param[in] event_type Type of event that occurred
	* \param[in] status Event status
	*
	* \return Standard Pacemaker return code
	*/
	static int
	validate_reply_event(data_t data, const pcmk_ipc_api_t api,
	enum pcmk_ipc_event event_type, crm_exit_t status)
	{
	pcmk__output_t *out = data->out;

	switch (event_type) {
	case pcmk_ipc_event_reply:
	break;

	case pcmk_ipc_event_disconnect:
	if (data->rc == ECONNRESET) { // Unexpected
	out->err(out, "error: Lost connection to %s",
	pcmk_ipc_name(api, true));
	}
	// Nothing bad but not the reply we're looking for
	return ENOTSUP;

	default:
	// Ditto
	return ENOTSUP;
	}

	if (status != CRM_EX_OK) {
	out->err(out, "error: Bad reply from %s: %s",
	pcmk_ipc_name(api, true), crm_exit_str(status));
	data->rc = EBADMSG;
	return data->rc;
	}
	return pcmk_rc_ok;
	}

	/*!
	* \internal
	* \brief Validate that a controller API event is a good reply of expected type
	*
	* \param[in,out] data API results and options
	* \param[in] api Controller connection
	* \param[in] event_type Type of event that occurred
	* \param[in] status Event status
	* \param[in] event_data Event-specific data
	* \param[in] expected_type Expected reply type
	*
	* \return Standard Pacemaker return code
	*/
	static int
	validate_controld_reply(data_t data, const pcmk_ipc_api_t api,
	enum pcmk_ipc_event event_type, crm_exit_t status,
	const void *event_data,
	enum pcmk_controld_api_reply expected_type)
	{
	pcmk__output_t *out = data->out;
	int rc = pcmk_rc_ok;
	const pcmk_controld_api_reply_t *reply = NULL;

	rc = validate_reply_event(data, api, event_type, status);
	if (rc != pcmk_rc_ok) {
	return rc;
	}

	reply = (const pcmk_controld_api_reply_t *) event_data;

	if (reply->reply_type != expected_type) {
	out->err(out, "error: Unexpected reply type '%s' from controller",
	pcmk__controld_api_reply2str(reply->reply_type));
	data->rc = EBADMSG;
	return data->rc;
	}

	return pcmk_rc_ok;
	}

	/*!
	* \internal
	* \brief Validate that a \p pacemakerd API event is a good reply of expected
	* type
	*
	* \param[in,out] data API results and options
	* \param[in] api \p pacemakerd connection
	* \param[in] event_type Type of event that occurred
	* \param[in] status Event status
	* \param[in] event_data Event-specific data
	* \param[in] expected_type Expected reply type
	*
	* \return Standard Pacemaker return code
	*/
	static int
	validate_pcmkd_reply(data_t data, const pcmk_ipc_api_t api,
	enum pcmk_ipc_event event_type, crm_exit_t status,
	const void *event_data,
	enum pcmk_pacemakerd_api_reply expected_type)
	{
	pcmk__output_t *out = data->out;
	const pcmk_pacemakerd_api_reply_t *reply = NULL;
	int rc = validate_reply_event(data, api, event_type, status);

	if (rc != pcmk_rc_ok) {
	return rc;
	}

	reply = (const pcmk_pacemakerd_api_reply_t *) event_data;

	if (reply->reply_type != expected_type) {
	out->err(out, "error: Unexpected reply type '%s' from pacemakerd",
	pcmk__pcmkd_api_reply2str(reply->reply_type));
	data->rc = EBADMSG;
	return data->rc;
	}

	return pcmk_rc_ok;
	}

	/*!
	* \internal
	* \brief Process a controller status IPC event
	*
	* \param[in,out] controld_api Controller connection
	* \param[in] event_type Type of event that occurred
	* \param[in] status Event status
	* \param[in,out] event_data \p pcmk_controld_api_reply_t object containing
	* event-specific data
	* \param[in,out] user_data \p data_t object for API results and options
	*/
	static void
	controller_status_event_cb(pcmk_ipc_api_t *controld_api,
	enum pcmk_ipc_event event_type, crm_exit_t status,
	void event_data, void user_data)
	{
	data_t data = (data_t ) user_data;
	pcmk__output_t *out = data->out;
	const pcmk_controld_api_reply_t *reply = NULL;

	int rc = validate_controld_reply(data, controld_api, event_type, status,
	event_data, pcmk_controld_reply_ping);

	if (rc != pcmk_rc_ok) {
	return;
	}

	reply = (const pcmk_controld_api_reply_t *) event_data;
	out->message(out, "health",
	reply->data.ping.sys_from, reply->host_from,
	reply->data.ping.fsa_state, reply->data.ping.result);
	data->rc = pcmk_rc_ok;
	}

	/*!
	* \internal
	* \brief Process a designated controller IPC event
	*
	* \param[in,out] controld_api Controller connection
	* \param[in] event_type Type of event that occurred
	* \param[in] status Event status
	* \param[in,out] event_data \p pcmk_controld_api_reply_t object containing
	* event-specific data
	* \param[in,out] user_data \p data_t object for API results and options
	*/
	static void
	designated_controller_event_cb(pcmk_ipc_api_t *controld_api,
	enum pcmk_ipc_event event_type,
	crm_exit_t status, void *event_data,
	void *user_data)
	{
	data_t data = (data_t ) user_data;
	pcmk__output_t *out = data->out;
	const pcmk_controld_api_reply_t *reply = NULL;

	int rc = validate_controld_reply(data, controld_api, event_type, status,
	event_data, pcmk_controld_reply_ping);

	if (rc != pcmk_rc_ok) {
	return;
	}

	reply = (const pcmk_controld_api_reply_t *) event_data;
	out->message(out, "dc", reply->host_from);
	data->rc = pcmk_rc_ok;
	}

	/*!
	* \internal
	* \brief Process a node info IPC event
	*
	* \param[in,out] controld_api Controller connection
	* \param[in] event_type Type of event that occurred
	* \param[in] status Event status
	* \param[in,out] event_data \p pcmk_controld_api_reply_t object containing
	* event-specific data
	* \param[in,out] user_data \p data_t object for API results and options
	*/
	static void
	node_info_event_cb(pcmk_ipc_api_t *controld_api, enum pcmk_ipc_event event_type,
	crm_exit_t status, void event_data, void user_data)
	{
	data_t data = (data_t ) user_data;
	pcmk__output_t *out = data->out;

	const pcmk_controld_api_reply_t *reply = NULL;

	int rc = validate_controld_reply(data, controld_api, event_type, status,
	event_data, pcmk_controld_reply_info);

	if (rc != pcmk_rc_ok) {
	return;
	}

	reply = (const pcmk_controld_api_reply_t *) event_data;

	if (reply->data.node_info.uname == NULL) {
	out->err(out, "Node is not known to cluster");
	data->rc = pcmk_rc_node_unknown;
	return;
	}

	data->node_info.have_quorum = reply->data.node_info.have_quorum;
	data->node_info.is_remote = reply->data.node_info.is_remote;
	data->node_info.id = (uint32_t) reply->data.node_info.id;

	pcmk__str_update(data->node_info.node_name, reply->data.node_info.uname);
	pcmk__str_update(data->node_info.uuid, reply->data.node_info.uuid);
	pcmk__str_update(data->node_info.state, reply->data.node_info.state);

	if (data->show_output) {
	out->message(out, "node-info",
	(uint32_t) reply->data.node_info.id, reply->data.node_info.uname,
	reply->data.node_info.uuid, reply->data.node_info.state,
	reply->data.node_info.have_quorum,
	reply->data.node_info.is_remote);
	}

	data->rc = pcmk_rc_ok;
	}

	/*!
	* \internal
	* \brief Process a \p pacemakerd status IPC event
	*
	* \param[in,out] pacemakerd_api \p pacemakerd connection
	* \param[in] event_type Type of event that occurred
	* \param[in] status Event status
	* \param[in,out] event_data \p pcmk_pacemakerd_api_reply_t object
	* containing event-specific data
	* \param[in,out] user_data \p data_t object for API results and options
	*/
	static void
	pacemakerd_event_cb(pcmk_ipc_api_t *pacemakerd_api,
	enum pcmk_ipc_event event_type, crm_exit_t status,
	void event_data, void user_data)
	{
	data_t *data = user_data;
	pcmk__output_t *out = data->out;
	const pcmk_pacemakerd_api_reply_t *reply = NULL;

	int rc = validate_pcmkd_reply(data, pacemakerd_api, event_type, status,
	event_data, pcmk_pacemakerd_reply_ping);

	if (rc != pcmk_rc_ok) {
	return;
	}

	// Parse desired information from reply
	reply = (const pcmk_pacemakerd_api_reply_t *) event_data;

	data->pcmkd_state = reply->data.ping.state;
	data->rc = pcmk_rc_ok;

	if (!data->show_output) {
	return;
	}

	if (reply->data.ping.status == pcmk_rc_ok) {
	out->message(out, "pacemakerd-health",
	reply->data.ping.sys_from, reply->data.ping.state, NULL,
	reply->data.ping.last_good);
	} else {
	out->message(out, "pacemakerd-health",
	reply->data.ping.sys_from, reply->data.ping.state,
	"query failed", time(NULL));
	}
	}

	static pcmk_ipc_api_t *
	ipc_connect(data_t *data, enum pcmk_ipc_server server, pcmk_ipc_callback_t cb,
	enum pcmk_ipc_dispatch dispatch_type, bool eremoteio_ok)
	{
	int rc;
	pcmk__output_t *out = data->out;
	pcmk_ipc_api_t *api = NULL;

	rc = pcmk_new_ipc_api(&api, server);
	if (api == NULL) {
	out->err(out, "error: Could not connect to %s: %s",
	pcmk_ipc_name(api, true),
	pcmk_rc_str(rc));
	data->rc = rc;
	return NULL;
	}
	if (cb != NULL) {
	pcmk_register_ipc_callback(api, cb, data);
	}

	rc = pcmk__connect_ipc(api, dispatch_type, 5);
	if (rc != pcmk_rc_ok) {
	if (rc == EREMOTEIO) {
	data->pcmkd_state = pcmk_pacemakerd_state_remote;
	if (eremoteio_ok) {
	/* EREMOTEIO may be expected and acceptable for some callers
	* on a Pacemaker Remote node
	*/
	crm_debug("Ignoring %s connection failure: No "
	"Pacemaker Remote connection",
	pcmk_ipc_name(api, true));
	rc = pcmk_rc_ok;
	} else {
	out->err(out, "error: Could not connect to %s: %s",
	pcmk_ipc_name(api, true), pcmk_rc_str(rc));
	}
	}
	data->rc = rc;
	pcmk_free_ipc_api(api);
	return NULL;
	}

	return api;
	}

	/*!
	* \internal
	* \brief Poll an IPC API connection until timeout or a reply is received
	*
	* \param[in,out] data API results and options
	* \param[in,out] api IPC API connection
	* \param[in] on_node If not \p NULL, name of the node to poll (used only
	* for logging)
	*
	* \note Sets the \p rc member of \p data on error
	*/
	static void
	poll_until_reply(data_t data, pcmk_ipc_api_t api, const char *on_node)
	{
	pcmk__output_t *out = data->out;

	uint64_t start_nsec = qb_util_nano_current_get();
	uint64_t end_nsec = 0;
	uint64_t elapsed_ms = 0;
	uint64_t remaining_ms = data->message_timeout_ms;

	while (remaining_ms > 0) {
	int rc = pcmk_poll_ipc(api, remaining_ms);

	if (rc == EAGAIN) {
	// Poll timed out
	break;
	}

	if (rc != pcmk_rc_ok) {
	out->err(out, "error: Failed to poll %s API%s%s: %s",
	pcmk_ipc_name(api, true), (on_node != NULL)? " on " : "",
	pcmk__s(on_node, ""), pcmk_rc_str(rc));
	data->rc = rc;
	return;
	}

	pcmk_dispatch_ipc(api);

	if (data->rc != EAGAIN) {
	// Received a reply
	return;
	}
	end_nsec = qb_util_nano_current_get();
	elapsed_ms = (end_nsec - start_nsec) / QB_TIME_NS_IN_MSEC;
	remaining_ms = data->message_timeout_ms - elapsed_ms;
	}

	out->err(out,
	"error: Timed out after %ums waiting for reply from %s API%s%s",
	data->message_timeout_ms, pcmk_ipc_name(api, true),
	(on_node != NULL)? " on " : "", pcmk__s(on_node, ""));
	data->rc = EAGAIN;
	}

	/*!
	* \internal
	* \brief Get and output controller status
	*
	* \param[in,out] out Output object
	* \param[in] node_name Name of node whose status is desired
	* (\p NULL for DC)
	* \param[in] message_timeout_ms How long to wait for a reply from the
	* the controller API. If 0,
	* \p pcmk_ipc_dispatch_sync will be used.
	* Otherwise, \p pcmk_ipc_dispatch_poll will
	* be used.
	*
	* \return Standard Pacemaker return code
	*/
	int
	pcmk__controller_status(pcmk__output_t out, const char node_name,
	unsigned int message_timeout_ms)
	{
	data_t data = {
	.out = out,
	.rc = EAGAIN,
	.message_timeout_ms = message_timeout_ms,
	};
	enum pcmk_ipc_dispatch dispatch_type = pcmk_ipc_dispatch_poll;
	pcmk_ipc_api_t *controld_api = NULL;

	if (message_timeout_ms == 0) {
	dispatch_type = pcmk_ipc_dispatch_sync;
	}
	controld_api = ipc_connect(&data, pcmk_ipc_controld,
	controller_status_event_cb, dispatch_type,
	false);

	if (controld_api != NULL) {
	int rc = pcmk_controld_api_ping(controld_api, node_name);
	if (rc != pcmk_rc_ok) {
	out->err(out, "error: Could not ping controller API on %s: %s",
	pcmk__s(node_name, "DC"), pcmk_rc_str(rc));
	data.rc = rc;
	}

	if (dispatch_type == pcmk_ipc_dispatch_poll) {
	poll_until_reply(&data, controld_api, pcmk__s(node_name, "DC"));
	}
	pcmk_free_ipc_api(controld_api);
	}

	return data.rc;
	}


	// Documented in header
	int
	pcmk_controller_status(xmlNodePtr xml, const char node_name,
	unsigned int message_timeout_ms)
	{
	pcmk__output_t *out = NULL;
	int rc = pcmk_rc_ok;

	rc = pcmk__xml_output_new(&out, xml);
	if (rc != pcmk_rc_ok) {
	return rc;
	}

	pcmk__register_lib_messages(out);

	rc = pcmk__controller_status(out, node_name, message_timeout_ms);
	pcmk__xml_output_finish(out, pcmk_rc2exitc(rc), xml);
	return rc;
	}

	/*!
	* \internal
	* \brief Get and output designated controller node name
	*
	* \param[in,out] out Output object
	* \param[in] message_timeout_ms How long to wait for a reply from the
	* the controller API. If 0,
	* \p pcmk_ipc_dispatch_sync will be used.
	* Otherwise, \p pcmk_ipc_dispatch_poll will
	* be used.
	*
	* \return Standard Pacemaker return code
	*/
	int
	pcmk__designated_controller(pcmk__output_t *out,
	unsigned int message_timeout_ms)
	{
	data_t data = {
	.out = out,
	.rc = EAGAIN,
	.message_timeout_ms = message_timeout_ms,
	};
	enum pcmk_ipc_dispatch dispatch_type = pcmk_ipc_dispatch_poll;
	pcmk_ipc_api_t *controld_api = NULL;

	if (message_timeout_ms == 0) {
	dispatch_type = pcmk_ipc_dispatch_sync;
	}
	controld_api = ipc_connect(&data, pcmk_ipc_controld,
	designated_controller_event_cb, dispatch_type,
	false);

	if (controld_api != NULL) {
	int rc = pcmk_controld_api_ping(controld_api, NULL);
	if (rc != pcmk_rc_ok) {
	out->err(out, "error: Could not ping controller API on DC: %s",
	pcmk_rc_str(rc));
	data.rc = rc;
	}

	if (dispatch_type == pcmk_ipc_dispatch_poll) {
	poll_until_reply(&data, controld_api, "DC");
	}
	pcmk_free_ipc_api(controld_api);
	}

	return data.rc;
	}

	// Documented in header
	int
	pcmk_designated_controller(xmlNodePtr *xml, unsigned int message_timeout_ms)
	{
	pcmk__output_t *out = NULL;
	int rc = pcmk_rc_ok;

	rc = pcmk__xml_output_new(&out, xml);
	if (rc != pcmk_rc_ok) {
	return rc;
	}

	pcmk__register_lib_messages(out);

	rc = pcmk__designated_controller(out, message_timeout_ms);
	pcmk__xml_output_finish(out, pcmk_rc2exitc(rc), xml);
	return rc;
	}

	/*!
	* \internal
	* \brief Get and optionally output node info corresponding to a node ID from
	* the controller
	*
	* \param[in,out] out Output object
	* \param[in,out] node_id ID of node whose info to get. If \p NULL
	* or 0, get the local node's info. If not
	* \c NULL, store the true node ID here on
	* success.
	* \param[out] node_name If not \c NULL, where to store the node
	* name
	* \param[out] uuid If not \c NULL, where to store the node
	* UUID
	* \param[out] state If not \c NULL, where to store the
	* membership state
	* \param[out] is_remote If not \c NULL, where to store whether the
	* node is a Pacemaker Remote node
	* \param[out] have_quorum If not \c NULL, where to store whether the
	* node has quorum
	* \param[in] show_output Whether to show the node info
	* \param[in] message_timeout_ms How long to wait for a reply from the
	* the controller API. If 0,
	* \c pcmk_ipc_dispatch_sync will be used.
	* Otherwise, \c pcmk_ipc_dispatch_poll will
	* be used.
	*
	* \return Standard Pacemaker return code
	*
	* \note The caller is responsible for freeing \p node_name, \p uuid, and
	* \p *state using \p free().
	*/
	int
	pcmk__query_node_info(pcmk__output_t out, uint32_t node_id, char **node_name,
	char uuid, char state, bool *have_quorum,
	bool *is_remote, bool show_output,
	unsigned int message_timeout_ms)
	{
	data_t data = {
	.out = out,
	.show_output = show_output,
	.rc = EAGAIN,
	.message_timeout_ms = message_timeout_ms,
	.node_info = {
	.id = (node_id == NULL)? 0 : *node_id,
	.node_name = node_name,
	.uuid = uuid,
	.state = state,
	},
	};
	enum pcmk_ipc_dispatch dispatch_type = pcmk_ipc_dispatch_poll;
	pcmk_ipc_api_t *controld_api = NULL;

	if (node_name != NULL) {
	*node_name = NULL;
	}
	if (uuid != NULL) {
	*uuid = NULL;
	}
	if (state != NULL) {
	*state = NULL;
	}

	if (message_timeout_ms == 0) {
	dispatch_type = pcmk_ipc_dispatch_sync;
	}
	controld_api = ipc_connect(&data, pcmk_ipc_controld, node_info_event_cb,
	dispatch_type, false);

	if (controld_api != NULL) {
	int rc = pcmk_controld_api_node_info(controld_api,
	(node_id != NULL)? *node_id : 0);

	if (rc != pcmk_rc_ok) {
	out->err(out,
	"error: Could not send request to controller API on local "
	"node: %s", pcmk_rc_str(rc));
	data.rc = rc;
	}

	if (dispatch_type == pcmk_ipc_dispatch_poll) {
	poll_until_reply(&data, controld_api, "local node");
	}
	pcmk_free_ipc_api(controld_api);
	}

	if (data.rc != pcmk_rc_ok) {
	return data.rc;
	}

	// String outputs are set in callback
	if (node_id != NULL) {
	*node_id = data.node_info.id;
	}
	if (have_quorum != NULL) {
	*have_quorum = data.node_info.have_quorum;
	}
	if (is_remote != NULL) {
	*is_remote = data.node_info.is_remote;
	}

	return data.rc;
	}

	// Documented in header
	int
	pcmk_query_node_info(xmlNodePtr xml, uint32_t node_id, char **node_name,
	char uuid, char state, bool *have_quorum,
	bool *is_remote, bool show_output,
	unsigned int message_timeout_ms)
	{
	pcmk__output_t *out = NULL;
	int rc = pcmk_rc_ok;

	pcmk__assert(node_name != NULL);

	rc = pcmk__xml_output_new(&out, xml);
	if (rc != pcmk_rc_ok) {
	return rc;
	}

	pcmk__register_lib_messages(out);

	rc = pcmk__query_node_info(out, node_id, node_name, uuid, state,
	have_quorum, is_remote, show_output,
	message_timeout_ms);
	pcmk__xml_output_finish(out, pcmk_rc2exitc(rc), xml);
	return rc;
	}

	/*!
	* \internal
	* \brief Get and optionally output \p pacemakerd status
	*
	* \param[in,out] out Output object
	* \param[in] ipc_name IPC name for request
	* \param[in] message_timeout_ms How long to wait for a reply from the
	* \p pacemakerd API. If 0,
	* \p pcmk_ipc_dispatch_sync will be used.
	* Otherwise, \p pcmk_ipc_dispatch_poll will
	* be used.
	* \param[in] show_output Whether to output the \p pacemakerd state
	* \param[out] state Where to store the \p pacemakerd state, if
	* not \p NULL
	*
	* \return Standard Pacemaker return code
	*
	* \note This function sets \p state to \p pcmk_pacemakerd_state_remote and
	* returns \p pcmk_rc_ok if the IPC connection attempt returns
	* \p EREMOTEIO. That code indicates that this is a Pacemaker Remote node
	* with the remote executor running. The node may be connected to the
	* cluster.
	*/
	int
	pcmk__pacemakerd_status(pcmk__output_t out, const char ipc_name,
	unsigned int message_timeout_ms, bool show_output,
	enum pcmk_pacemakerd_state *state)
	{
	data_t data = {
	.out = out,
	.show_output = show_output,
	.rc = EAGAIN,
	.message_timeout_ms = message_timeout_ms,
	.pcmkd_state = pcmk_pacemakerd_state_invalid,
	};
	enum pcmk_ipc_dispatch dispatch_type = pcmk_ipc_dispatch_poll;
	pcmk_ipc_api_t *pacemakerd_api = NULL;

	if (message_timeout_ms == 0) {
	dispatch_type = pcmk_ipc_dispatch_sync;
	}
	pacemakerd_api = ipc_connect(&data, pcmk_ipc_pacemakerd,
	pacemakerd_event_cb, dispatch_type, true);

	if (pacemakerd_api != NULL) {
	int rc = pcmk_pacemakerd_api_ping(pacemakerd_api, ipc_name);
	if (rc != pcmk_rc_ok) {
	out->err(out, "error: Could not ping launcher API: %s",
	pcmk_rc_str(rc));
	data.rc = rc;
	}

	if (dispatch_type == pcmk_ipc_dispatch_poll) {
	poll_until_reply(&data, pacemakerd_api, NULL);
	}
	pcmk_free_ipc_api(pacemakerd_api);

	} else if ((data.pcmkd_state == pcmk_pacemakerd_state_remote)
	&& show_output) {
	// No API connection so the callback wasn't run
	out->message(out, "pacemakerd-health",
	NULL, data.pcmkd_state, NULL, time(NULL));
	}

	if (state != NULL) {
	*state = data.pcmkd_state;
	}
	return data.rc;
	}

	// Documented in header
	int
	pcmk_pacemakerd_status(xmlNodePtr xml, const char ipc_name,
	unsigned int message_timeout_ms)
	{
	pcmk__output_t *out = NULL;
	int rc = pcmk_rc_ok;

	rc = pcmk__xml_output_new(&out, xml);
	if (rc != pcmk_rc_ok) {
	return rc;
	}

	pcmk__register_lib_messages(out);

	rc = pcmk__pacemakerd_status(out, ipc_name, message_timeout_ms, true, NULL);
	pcmk__xml_output_finish(out, pcmk_rc2exitc(rc), xml);
	return rc;
	}

	/* user data for looping through remote node xpath searches */
	struct node_data {
	pcmk__output_t *out;
	int found;
	const char field; / XML attribute to check for node name */
	const char *type;
	bool bash_export;
	};

	static void
	remote_node_print_helper(xmlNode result, void user_data)
	{
	struct node_data *data = user_data;
	pcmk__output_t *out = data->out;
	const char *name = crm_element_value(result, PCMK_XA_UNAME);
	const char *id = crm_element_value(result, data->field);

	// node name and node id are the same for remote/guest nodes
	out->message(out, "crmadmin-node", data->type,
	pcmk__s(name, id), id, data->bash_export);
	data->found++;
	}

	// \return Standard Pacemaker return code
	int
	pcmk__list_nodes(pcmk__output_t out, const char node_types, bool bash_export)
	{
	xmlNode *xml_node = NULL;
	int rc;

	rc = cib__signon_query(out, NULL, &xml_node);

	if (rc == pcmk_rc_ok) {
	struct node_data data = {
	.out = out,
	.found = 0,
	.bash_export = bash_export
	};

	/* PCMK_XE_NODES acts as the list's element name for CLI tools that
	* use pcmk__output_enable_list_element. Otherwise PCMK_XE_NODES is
	* the value of the list's PCMK_XA_NAME attribute.
	*/
	out->begin_list(out, NULL, NULL, PCMK_XE_NODES);

	if (!pcmk__str_empty(node_types) && strstr(node_types, "all")) {
	node_types = NULL;
	}

	if (pcmk__str_empty(node_types) \|\| strstr(node_types, "cluster")) {
	data.field = PCMK_XA_ID;
	data.type = "cluster";
	crm_foreach_xpath_result(xml_node, PCMK__XP_MEMBER_NODE_CONFIG,
	remote_node_print_helper, &data);
	}

	if (pcmk__str_empty(node_types) \|\| strstr(node_types, "guest")) {
	data.field = PCMK_XA_VALUE;
	data.type = "guest";
	crm_foreach_xpath_result(xml_node, PCMK__XP_GUEST_NODE_CONFIG,
	remote_node_print_helper, &data);
	}

	if (pcmk__str_empty(node_types)
	\|\| pcmk__str_eq(node_types, ",\|^remote", pcmk__str_regex)) {
	data.field = PCMK_XA_ID;
	data.type = "remote";
	crm_foreach_xpath_result(xml_node, PCMK__XP_REMOTE_NODE_CONFIG,
	remote_node_print_helper, &data);
	}

	out->end_list(out);

	if (data.found == 0) {
	out->info(out, "No nodes configured");
	}

	pcmk__xml_free(xml_node);
	}

	return rc;
	}

	int
	pcmk_list_nodes(xmlNodePtr xml, const char node_types)
	{
	pcmk__output_t *out = NULL;
	int rc = pcmk_rc_ok;

	rc = pcmk__xml_output_new(&out, xml);
	if (rc != pcmk_rc_ok) {
	return rc;
	}

	pcmk__register_lib_messages(out);

	rc = pcmk__list_nodes(out, node_types, FALSE);
	pcmk__xml_output_finish(out, pcmk_rc2exitc(rc), xml);
	return rc;
	}

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