attrd.c
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attrd.c
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	/*
	* Copyright (C) 2004 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/stat.h>
	#include <unistd.h>

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

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

	#include <crm/common/xml.h>

	#include <crm/attrd.h>

	#define OPTARGS "hV"
	#if SUPPORT_HEARTBEAT
	ll_cluster_t *attrd_cluster_conn;
	#endif

	GMainLoop *mainloop = NULL;
	char *attrd_uname = NULL;
	char *attrd_uuid = NULL;
	gboolean need_shutdown = FALSE;

	GHashTable *attr_hash = NULL;
	cib_t *cib_conn = NULL;

	typedef struct attrd_client_s {
	char *user;
	} attrd_client_t;

	typedef struct attr_hash_entry_s {
	char *uuid;
	char *id;
	char *set;
	char *section;

	char *value;
	char *stored_value;

	int timeout;
	char *dampen;
	guint timer_id;

	char *user;

	} attr_hash_entry_t;

	void attrd_local_callback(xmlNode * msg);
	gboolean attrd_timer_callback(void *user_data);
	gboolean attrd_trigger_update(attr_hash_entry_t * hash_entry);
	void attrd_perform_update(attr_hash_entry_t * hash_entry);

	static void
	free_hash_entry(gpointer data)
	{
	attr_hash_entry_t *entry = data;

	if (entry == NULL) {
	return;
	}
	free(entry->id);
	free(entry->set);
	free(entry->dampen);
	free(entry->section);
	free(entry->uuid);
	free(entry->value);
	free(entry->stored_value);
	free(entry->user);
	free(entry);
	}

	static int32_t
	attrd_ipc_accept(qb_ipcs_connection_t *c, uid_t uid, gid_t gid)
	{
	attrd_client_t *new_client = NULL;
	#if ENABLE_ACL
	struct group *crm_grp = NULL;
	#endif

	crm_trace("Connecting %p for connection from %d by uid=%d gid=%d",
	c, crm_ipcs_client_pid(c), uid, gid);
	if (need_shutdown) {
	crm_info("Ignoring connection request during shutdown");
	return FALSE;
	}

	new_client = calloc(1, sizeof(attrd_client_t));

	#if ENABLE_ACL
	crm_grp = getgrnam(CRM_DAEMON_GROUP);
	if (crm_grp) {
	qb_ipcs_connection_auth_set(c, -1, crm_grp->gr_gid, S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP);
	}

	new_client->user = uid2username(uid);
	#endif

	qb_ipcs_context_set(c, new_client);

	return 0;
	}

	static void
	attrd_ipc_created(qb_ipcs_connection_t *c)
	{
	crm_trace("Client %p connected from %d", c, crm_ipcs_client_pid(c));
	}

	/* Exit code means? */
	static int32_t
	attrd_ipc_dispatch(qb_ipcs_connection_t c, void data, size_t size)
	{
	uint32_t id = 0;
	uint32_t flags = 0;
	#if ENABLE_ACL
	attrd_client_t *client = qb_ipcs_context_get(c);
	#endif
	xmlNode *msg = crm_ipcs_recv(c, data, size, &id, &flags);

	if(flags & crm_ipc_client_response) {
	crm_trace("Ack'ing msg from %d (%p)", crm_ipcs_client_pid(c), c);
	crm_ipcs_send_ack(c, id, "ack", __FUNCTION__, __LINE__);
	}

	if (msg == NULL) {
	crm_debug("No msg from %d (%p)", crm_ipcs_client_pid(c), c);
	return 0;
	}

	#if ENABLE_ACL
	determine_request_user(client->user, msg, F_ATTRD_USER);
	#endif

	crm_trace("Processing msg from %d (%p)", crm_ipcs_client_pid(c), c);
	crm_log_xml_trace(msg, __PRETTY_FUNCTION__);

	attrd_local_callback(msg);

	free_xml(msg);
	return 0;
	}

	/* Error code means? */
	static int32_t
	attrd_ipc_closed(qb_ipcs_connection_t *c)
	{
	crm_trace("Connection %p from %d closed", c, crm_ipcs_client_pid(c));
	return 0;
	}

	static void
	attrd_ipc_destroy(qb_ipcs_connection_t *c)
	{
	attrd_client_t *client = qb_ipcs_context_get(c);

	if (client == NULL) {
	return;
	}

	crm_trace("Destroying %p", c);
	free(client->user);
	free(client);
	crm_trace("Free'd the attrd client");

	return;
	}

	struct qb_ipcs_service_handlers ipc_callbacks =
	{
	.connection_accept = attrd_ipc_accept,
	.connection_created = attrd_ipc_created,
	.msg_process = attrd_ipc_dispatch,
	.connection_closed = attrd_ipc_closed,
	.connection_destroyed = attrd_ipc_destroy
	};

	static void
	attrd_shutdown(int nsig)
	{
	need_shutdown = TRUE;
	crm_info("Exiting");
	if (mainloop != NULL && g_main_is_running(mainloop)) {
	g_main_quit(mainloop);
	} else {
	exit(0);
	}
	}

	static void
	usage(const char *cmd, int exit_status)
	{
	FILE *stream;

	stream = exit_status ? stderr : stdout;

	fprintf(stream, "usage: %s [-srkh] [-c configure file]\n", cmd);
	/* fprintf(stream, "\t-d\tsets debug level\n"); */
	/* fprintf(stream, "\t-s\tgets daemon status\n"); */
	/* fprintf(stream, "\t-r\trestarts daemon\n"); */
	/* fprintf(stream, "\t-k\tstops daemon\n"); */
	/* fprintf(stream, "\t-h\thelp message\n"); */
	fflush(stream);

	exit(exit_status);
	}

	static void
	stop_attrd_timer(attr_hash_entry_t * hash_entry)
	{
	if (hash_entry != NULL && hash_entry->timer_id != 0) {
	crm_trace("Stopping %s timer", hash_entry->id);
	g_source_remove(hash_entry->timer_id);
	hash_entry->timer_id = 0;
	}
	}

	static void
	log_hash_entry(int level, attr_hash_entry_t * entry, const char *text)
	{
	do_crm_log(level, "%s: Set: %s, Name: %s, Value: %s, Timeout: %s",
	text, entry->section, entry->id, entry->value, entry->dampen);
	}

	static attr_hash_entry_t *
	find_hash_entry(xmlNode * msg)
	{
	const char *value = NULL;
	const char *attr = crm_element_value(msg, F_ATTRD_ATTRIBUTE);
	attr_hash_entry_t *hash_entry = NULL;

	if (attr == NULL) {
	crm_info("Ignoring message with no attribute name");
	return NULL;
	}

	hash_entry = g_hash_table_lookup(attr_hash, attr);

	if (hash_entry == NULL) {
	/* create one and add it */
	crm_info("Creating hash entry for %s", attr);
	hash_entry = calloc(1, sizeof(attr_hash_entry_t));
	hash_entry->id = strdup(attr);

	g_hash_table_insert(attr_hash, hash_entry->id, hash_entry);
	hash_entry = g_hash_table_lookup(attr_hash, attr);
	CRM_CHECK(hash_entry != NULL, return NULL);
	}

	value = crm_element_value(msg, F_ATTRD_SET);
	if (value != NULL) {
	free(hash_entry->set);
	hash_entry->set = strdup(value);
	crm_debug("\t%s->set: %s", attr, value);
	}

	value = crm_element_value(msg, F_ATTRD_SECTION);
	if (value == NULL) {
	value = XML_CIB_TAG_STATUS;
	}
	free(hash_entry->section);
	hash_entry->section = strdup(value);
	crm_trace("\t%s->section: %s", attr, value);

	value = crm_element_value(msg, F_ATTRD_DAMPEN);
	if (value != NULL) {
	free(hash_entry->dampen);
	hash_entry->dampen = strdup(value);

	hash_entry->timeout = crm_get_msec(value);
	crm_trace("\t%s->timeout: %s", attr, value);
	}
	#if ENABLE_ACL
	free(hash_entry->user);

	value = crm_element_value(msg, F_ATTRD_USER);
	if (value != NULL) {
	hash_entry->user = strdup(value);
	crm_trace("\t%s->user: %s", attr, value);
	}
	#endif

	log_hash_entry(LOG_DEBUG_2, hash_entry, "Found (and updated) entry:");
	return hash_entry;
	}

	#if SUPPORT_HEARTBEAT
	static void
	attrd_ha_connection_destroy(gpointer user_data)
	{
	crm_trace("Invoked");
	if (need_shutdown) {
	/* we signed out, so this is expected */
	crm_info("Heartbeat disconnection complete");
	return;
	}

	crm_crit("Lost connection to heartbeat service!");
	if (mainloop != NULL && g_main_is_running(mainloop)) {
	g_main_quit(mainloop);
	return;
	}
	exit(EX_OK);
	}

	static void
	attrd_ha_callback(HA_Message * msg, void *private_data)
	{
	attr_hash_entry_t *hash_entry = NULL;
	xmlNode *xml = convert_ha_message(NULL, msg, __FUNCTION__);
	const char *from = crm_element_value(xml, F_ORIG);
	const char *op = crm_element_value(xml, F_ATTRD_TASK);
	const char *host = crm_element_value(xml, F_ATTRD_HOST);
	const char *ignore = crm_element_value(xml, F_ATTRD_IGNORE_LOCALLY);

	if (host != NULL && safe_str_eq(host, attrd_uname)) {
	crm_info("Update relayed from %s", from);
	attrd_local_callback(xml);

	} else if (ignore == NULL \|\| safe_str_neq(from, attrd_uname)) {
	crm_info("%s message from %s", op, from);
	hash_entry = find_hash_entry(xml);
	stop_attrd_timer(hash_entry);
	attrd_perform_update(hash_entry);
	}
	free_xml(xml);
	}

	#endif

	#if SUPPORT_COROSYNC
	static gboolean
	attrd_ais_dispatch(int kind, const char from, const char data)
	{
	xmlNode *xml = NULL;

	if (kind == crm_class_cluster) {
	xml = string2xml(data);
	if (xml == NULL) {
	crm_err("Bad message received: '%.120s'", data);
	}
	}

	if (xml != NULL) {
	attr_hash_entry_t *hash_entry = NULL;
	const char *op = crm_element_value(xml, F_ATTRD_TASK);
	const char *host = crm_element_value(xml, F_ATTRD_HOST);
	const char *ignore = crm_element_value(xml, F_ATTRD_IGNORE_LOCALLY);

	/* crm_xml_add_int(xml, F_SEQ, wrapper->id); */
	crm_xml_add(xml, F_ORIG, from);

	if (host != NULL && safe_str_eq(host, attrd_uname)) {
	crm_notice("Update relayed from %s", from);
	attrd_local_callback(xml);

	} else if (ignore == NULL \|\| safe_str_neq(from, attrd_uname)) {
	crm_trace("%s message from %s", op, from);
	hash_entry = find_hash_entry(xml);
	stop_attrd_timer(hash_entry);
	attrd_perform_update(hash_entry);
	}

	free_xml(xml);
	}

	return TRUE;
	}

	static void
	attrd_ais_destroy(gpointer unused)
	{
	if (need_shutdown) {
	/* we signed out, so this is expected */
	crm_info("Corosync disconnection complete");
	return;
	}

	crm_crit("Lost connection to Corosync service!");
	if (mainloop != NULL && g_main_is_running(mainloop)) {
	g_main_quit(mainloop);
	return;
	}
	exit(EX_USAGE);
	}
	#endif

	static void
	attrd_cib_connection_destroy(gpointer user_data)
	{
	cib_t *conn = user_data;
	conn->cmds->signoff(conn); /* Ensure IPC is cleaned up */

	if (need_shutdown) {
	crm_info("Connection to the CIB terminated...");

	} else {
	/* eventually this will trigger a reconnect, not a shutdown */
	crm_err("Connection to the CIB terminated...");
	exit(1);
	}

	return;
	}

	static void
	update_for_hash_entry(gpointer key, gpointer value, gpointer user_data)
	{
	attr_hash_entry_t *entry = value;

	if (entry->value != NULL) {
	attrd_timer_callback(value);
	}
	}

	static void
	local_update_for_hash_entry(gpointer key, gpointer value, gpointer user_data)
	{
	attr_hash_entry_t *entry = value;

	if (entry->timer_id == 0) {
	crm_trace("Performing local-only update after replace for %s", entry->id);
	attrd_perform_update(entry);
	/* } else {
	* just let the timer expire and attrd_timer_callback() will do the right thing
	*/
	}
	}

	static void
	do_cib_replaced(const char event, xmlNode msg)
	{
	crm_info("Updating all attributes after %s event", event);
	g_hash_table_foreach(attr_hash, local_update_for_hash_entry, NULL);
	}

	static gboolean
	cib_connect(void *user_data)
	{
	static int attempts = 1;
	static int max_retry = 20;
	gboolean was_err = FALSE;
	static cib_t *local_conn = NULL;

	if (local_conn == NULL) {
	local_conn = cib_new();
	}

	if (was_err == FALSE) {
	int rc = -ENOTCONN;

	if (attempts < max_retry) {
	crm_debug("CIB signon attempt %d", attempts);
	rc = local_conn->cmds->signon(local_conn, T_ATTRD, cib_command);
	}

	if (rc != pcmk_ok && attempts > max_retry) {
	crm_err("Signon to CIB failed: %s", pcmk_strerror(rc));
	was_err = TRUE;

	} else if (rc != pcmk_ok) {
	attempts++;
	return TRUE;
	}
	}

	crm_info("Connected to the CIB after %d signon attempts", attempts);

	if (was_err == FALSE) {
	int rc =
	local_conn->cmds->set_connection_dnotify(local_conn, attrd_cib_connection_destroy);
	if (rc != pcmk_ok) {
	crm_err("Could not set dnotify callback");
	was_err = TRUE;
	}
	}

	if (was_err == FALSE) {
	if (pcmk_ok !=
	local_conn->cmds->add_notify_callback(local_conn, T_CIB_REPLACE_NOTIFY,
	do_cib_replaced)) {
	crm_err("Could not set CIB notification callback");
	was_err = TRUE;
	}
	}

	if (was_err) {
	crm_err("Aborting startup");
	exit(100);
	}

	cib_conn = local_conn;

	crm_info("Sending full refresh now that we're connected to the cib");
	g_hash_table_foreach(attr_hash, local_update_for_hash_entry, NULL);

	return FALSE;
	}

	int
	main(int argc, char **argv)
	{
	int flag = 0;
	int argerr = 0;
	crm_cluster_t cluster;
	gboolean was_err = FALSE;
	qb_ipcs_connection_t *c = NULL;
	qb_ipcs_service_t *ipcs = NULL;

	crm_log_init(T_ATTRD, LOG_NOTICE, TRUE, FALSE, argc, argv, FALSE);
	mainloop_add_signal(SIGTERM, attrd_shutdown);

	while ((flag = getopt(argc, argv, OPTARGS)) != EOF) {
	switch (flag) {
	case 'V':
	crm_bump_log_level(argc, argv);
	break;
	case 'h': /* Help message */
	usage(T_ATTRD, EX_OK);
	break;
	default:
	++argerr;
	break;
	}
	}

	if (optind > argc) {
	++argerr;
	}

	if (argerr) {
	usage(T_ATTRD, EX_USAGE);
	}

	attr_hash = g_hash_table_new_full(crm_str_hash, g_str_equal, NULL, free_hash_entry);

	crm_info("Starting up");

	if (was_err == FALSE) {

	#if SUPPORT_COROSYNC
	if (is_openais_cluster()) {
	cluster.destroy = attrd_ais_destroy;
	cluster.cs_dispatch = attrd_ais_dispatch;
	}
	#endif

	#if SUPPORT_HEARTBEAT
	if (is_heartbeat_cluster()) {
	cluster.hb_dispatch = attrd_ha_callback;
	cluster.destroy = attrd_ha_connection_destroy;
	}
	#endif

	if (FALSE == crm_cluster_connect(&cluster)) {
	crm_err("HA Signon failed");
	was_err = TRUE;
	}

	attrd_uname = cluster.uname;
	attrd_uuid = cluster.uuid;
	#if SUPPORT_HEARTBEAT
	attrd_cluster_conn = cluster.hb_conn;
	#endif
	}

	crm_info("Cluster connection active");

	if (was_err == FALSE) {
	ipcs = mainloop_add_ipc_server(T_ATTRD, QB_IPC_NATIVE, &ipc_callbacks);
	if (ipcs == NULL) {
	crm_err("Could not start IPC server");
	was_err = TRUE;
	}
	}

	crm_info("Accepting attribute updates");

	mainloop = g_main_new(FALSE);

	if (0 == g_timeout_add_full(G_PRIORITY_LOW + 1, 5000, cib_connect, NULL, NULL)) {
	crm_info("Adding timer failed");
	was_err = TRUE;
	}

	if (was_err) {
	crm_err("Aborting startup");
	return 100;
	}

	crm_notice("Starting mainloop...");
	g_main_run(mainloop);
	crm_notice("Exiting...");

	#if SUPPORT_HEARTBEAT
	if (is_heartbeat_cluster()) {
	attrd_cluster_conn->llc_ops->signoff(attrd_cluster_conn, TRUE);
	attrd_cluster_conn->llc_ops->delete(attrd_cluster_conn);
	}
	#endif

	c = qb_ipcs_connection_first_get(ipcs);
	while(c != NULL) {
	qb_ipcs_connection_t *last = c;
	c = qb_ipcs_connection_next_get(ipcs, last);

	/* There really shouldn't be anyone connected at this point */
	crm_notice("Disconnecting client %p, pid=%d...", last, crm_ipcs_client_pid(last));
	qb_ipcs_disconnect(last);
	qb_ipcs_connection_unref(last);
	}

	qb_ipcs_destroy(ipcs);

	if (cib_conn) {
	cib_conn->cmds->signoff(cib_conn);
	cib_delete(cib_conn);
	}

	g_hash_table_destroy(attr_hash);
	free(attrd_uuid);
	empty_uuid_cache();

	qb_log_fini();
	return 0;
	}

	struct attrd_callback_s {
	char *attr;
	char *value;
	};

	static void
	attrd_cib_callback(xmlNode * msg, int call_id, int rc, xmlNode * output, void *user_data)
	{
	attr_hash_entry_t *hash_entry = NULL;
	struct attrd_callback_s *data = user_data;

	if(call_id < 0) {
	crm_warn("Update %s=%s failed: %s", data->attr, data->value, pcmk_strerror(call_id));
	goto cleanup;

	} else if (data->value == NULL && rc == -ENXIO) {
	rc = pcmk_ok;
	}

	switch (rc) {
	case pcmk_ok:
	crm_debug("Update %d for %s=%s passed", call_id, data->attr, data->value);
	hash_entry = g_hash_table_lookup(attr_hash, data->attr);

	if (hash_entry) {
	free(hash_entry->stored_value);
	hash_entry->stored_value = NULL;
	if (data->value != NULL) {
	hash_entry->stored_value = strdup(data->value);
	}
	}
	break;
	case -pcmk_err_diff_failed: /* When an attr changes while the CIB is syncing */
	case -ETIME: /* When an attr changes while there is a DC election */
	case -ENXIO: /* When an attr changes while the CIB is syncing a
	* newer config from a node that just came up
	*/
	crm_warn("Update %d for %s=%s failed: %s",
	call_id, data->attr, data->value, pcmk_strerror(rc));
	break;
	default:
	crm_err("Update %d for %s=%s failed: %s",
	call_id, data->attr, data->value, pcmk_strerror(rc));
	}
	cleanup:
	free(data->value);
	free(data->attr);
	free(data);
	}

	void
	attrd_perform_update(attr_hash_entry_t * hash_entry)
	{
	int rc = pcmk_ok;
	struct attrd_callback_s *data = NULL;
	const char *user_name = NULL;

	if (hash_entry == NULL) {
	return;

	} else if (cib_conn == NULL) {
	crm_info("Delaying operation %s=%s: cib not connected", hash_entry->id,
	crm_str(hash_entry->value));
	return;

	}
	#if ENABLE_ACL
	if (hash_entry->user) {
	user_name = hash_entry->user;
	crm_trace("Performing request from user '%s'", hash_entry->user);
	}
	#endif

	if (hash_entry->value == NULL) {
	/* delete the attr */
	rc = delete_attr_delegate(cib_conn, cib_none, hash_entry->section, attrd_uuid, NULL,
	hash_entry->set, hash_entry->uuid, hash_entry->id, NULL, FALSE,
	user_name);

	if (rc >= 0 && hash_entry->stored_value) {
	crm_notice("Sent delete %d: node=%s, attr=%s, id=%s, set=%s, section=%s",
	rc, attrd_uuid, hash_entry->id,
	hash_entry->uuid ? hash_entry->uuid : "<n/a>", hash_entry->set,
	hash_entry->section);

	} else if (rc < 0 && rc != -ENXIO) {
	crm_notice
	("Delete operation failed: node=%s, attr=%s, id=%s, set=%s, section=%s: %s (%d)",
	attrd_uuid, hash_entry->id, hash_entry->uuid ? hash_entry->uuid : "<n/a>",
	hash_entry->set, hash_entry->section, pcmk_strerror(rc), rc);

	} else {
	crm_trace("Sent delete %d: node=%s, attr=%s, id=%s, set=%s, section=%s",
	rc, attrd_uuid, hash_entry->id,
	hash_entry->uuid ? hash_entry->uuid : "<n/a>", hash_entry->set,
	hash_entry->section);
	}

	} else {
	/* send update */
	rc = update_attr_delegate(cib_conn, cib_none, hash_entry->section,
	attrd_uuid, NULL, hash_entry->set, hash_entry->uuid,
	hash_entry->id, hash_entry->value, FALSE, user_name);
	if (rc < 0) {
	crm_notice("Sent update %s=%s failed: %s", hash_entry->id, hash_entry->value, pcmk_strerror(rc));
	} if (safe_str_neq(hash_entry->value, hash_entry->stored_value) \|\| rc < 0) {
	crm_notice("Sent update %d: %s=%s", rc, hash_entry->id, hash_entry->value);
	} else {
	crm_trace("Sent update %d: %s=%s", rc, hash_entry->id, hash_entry->value);
	}
	}

	data = calloc(1, sizeof(struct attrd_callback_s));
	data->attr = strdup(hash_entry->id);
	if (hash_entry->value != NULL) {
	data->value = strdup(hash_entry->value);
	}
	add_cib_op_callback(cib_conn, rc, FALSE, data, attrd_cib_callback);

	return;
	}

	void
	attrd_local_callback(xmlNode * msg)
	{
	static int plus_plus_len = 5;
	attr_hash_entry_t *hash_entry = NULL;
	const char *from = crm_element_value(msg, F_ORIG);
	const char *op = crm_element_value(msg, F_ATTRD_TASK);
	const char *attr = crm_element_value(msg, F_ATTRD_ATTRIBUTE);
	const char *value = crm_element_value(msg, F_ATTRD_VALUE);
	const char *host = crm_element_value(msg, F_ATTRD_HOST);

	if (safe_str_eq(op, "refresh")) {
	crm_notice("Sending full refresh (origin=%s)", from);
	g_hash_table_foreach(attr_hash, update_for_hash_entry, NULL);
	return;
	}

	if (host != NULL && safe_str_neq(host, attrd_uname)) {
	send_cluster_message(crm_get_peer(0, host), crm_msg_attrd, msg, FALSE);
	return;
	}

	crm_debug("%s message from %s: %s=%s", op, from, attr, crm_str(value));
	hash_entry = find_hash_entry(msg);
	if (hash_entry == NULL) {
	return;
	}

	if (hash_entry->uuid == NULL) {
	const char *key = crm_element_value(msg, F_ATTRD_KEY);

	if (key) {
	hash_entry->uuid = strdup(key);
	}
	}

	crm_debug("Supplied: %s, Current: %s, Stored: %s",
	value, hash_entry->value, hash_entry->stored_value);

	if (safe_str_eq(value, hash_entry->value)
	&& safe_str_eq(value, hash_entry->stored_value)) {
	crm_trace("Ignoring non-change");
	return;

	} else if (value) {
	int offset = 1;
	int int_value = 0;
	int value_len = strlen(value);

	if (value_len < (plus_plus_len + 2)
	\|\| value[plus_plus_len] != '+'
	\|\| (value[plus_plus_len + 1] != '+' && value[plus_plus_len + 1] != '=')) {
	goto set_unexpanded;
	}

	int_value = char2score(hash_entry->value);
	if (value[plus_plus_len + 1] != '+') {
	const char *offset_s = value + (plus_plus_len + 2);

	offset = char2score(offset_s);
	}
	int_value += offset;

	if (int_value > INFINITY) {
	int_value = INFINITY;
	}

	crm_info("Expanded %s=%s to %d", attr, value, int_value);
	crm_xml_add_int(msg, F_ATTRD_VALUE, int_value);
	value = crm_element_value(msg, F_ATTRD_VALUE);
	}

	set_unexpanded:
	if (safe_str_eq(value, hash_entry->value) && hash_entry->timer_id) {
	/* We're already waiting to set this value */
	return;
	}

	free(hash_entry->value);
	hash_entry->value = NULL;
	if (value != NULL) {
	hash_entry->value = strdup(value);
	crm_debug("New value of %s is %s", attr, value);
	}

	stop_attrd_timer(hash_entry);

	if (hash_entry->timeout > 0) {
	hash_entry->timer_id = g_timeout_add(hash_entry->timeout, attrd_timer_callback, hash_entry);
	} else {
	attrd_trigger_update(hash_entry);
	}

	return;
	}

	gboolean
	attrd_timer_callback(void *user_data)
	{
	stop_attrd_timer(user_data);
	attrd_trigger_update(user_data);
	return TRUE; /* Always return true, removed cleanly by stop_attrd_timer() */
	}

	gboolean
	attrd_trigger_update(attr_hash_entry_t * hash_entry)
	{
	xmlNode *msg = NULL;

	/* send HA message to everyone */
	crm_notice("Sending flush op to all hosts for: %s (%s)",
	hash_entry->id, crm_str(hash_entry->value));
	log_hash_entry(LOG_DEBUG_2, hash_entry, "Sending flush op to all hosts for:");

	msg = create_xml_node(NULL, __FUNCTION__);
	crm_xml_add(msg, F_TYPE, T_ATTRD);
	crm_xml_add(msg, F_ORIG, attrd_uname);
	crm_xml_add(msg, F_ATTRD_TASK, "flush");
	crm_xml_add(msg, F_ATTRD_ATTRIBUTE, hash_entry->id);
	crm_xml_add(msg, F_ATTRD_SET, hash_entry->set);
	crm_xml_add(msg, F_ATTRD_SECTION, hash_entry->section);
	crm_xml_add(msg, F_ATTRD_DAMPEN, hash_entry->dampen);
	crm_xml_add(msg, F_ATTRD_VALUE, hash_entry->value);
	#if ENABLE_ACL
	if (hash_entry->user) {
	crm_xml_add(msg, F_ATTRD_USER, hash_entry->user);
	}
	#endif

	if (hash_entry->timeout <= 0) {
	crm_xml_add(msg, F_ATTRD_IGNORE_LOCALLY, hash_entry->value);
	attrd_perform_update(hash_entry);
	}

	send_cluster_message(NULL, crm_msg_attrd, msg, FALSE);
	free_xml(msg);

	return TRUE;
	}

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