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	diff --git a/lib/common/ipc.c b/lib/common/ipc.c
	index f060fcdb09..2949837e37 100644
	--- a/lib/common/ipc.c
	+++ b/lib/common/ipc.c
	@@ -1,1293 +1,1285 @@
	/*
	* Copyright (C) 2004 Andrew Beekhof <andrew@beekhof.net>
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* This library 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
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser 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 <grp.h>

	#include <errno.h>
	#include <fcntl.h>
	#include <bzlib.h>

	#include <crm/crm.h>
	#include <crm/msg_xml.h>
	#include <crm/common/ipc.h>
	#include <crm/common/ipcs.h>

	#define PCMK_IPC_VERSION 1

	struct crm_ipc_response_header {
	struct qb_ipc_response_header qb;
	uint32_t size_uncompressed;
	uint32_t size_compressed;
	uint32_t flags;
	uint8_t version; /* Protect against version changes for anyone that might bother to statically link us */
	};

	static int hdr_offset = 0;
	static unsigned int ipc_buffer_max = 0;
	static unsigned int pick_ipc_buffer(unsigned int max);

	static inline void
	crm_ipc_init(void)
	{
	if (hdr_offset == 0) {
	hdr_offset = sizeof(struct crm_ipc_response_header);
	}
	if (ipc_buffer_max == 0) {
	ipc_buffer_max = pick_ipc_buffer(0);
	}
	}

	unsigned int
	crm_ipc_default_buffer_size(void)
	{
	return pick_ipc_buffer(0);
	}

	static char *
	generateReference(const char custom1, const char custom2)
	{
	static uint ref_counter = 0;
	const char *local_cust1 = custom1;
	const char *local_cust2 = custom2;
	int reference_len = 4;
	char *since_epoch = NULL;

	reference_len += 20; /* too big */
	reference_len += 40; /* too big */

	if (local_cust1 == NULL) {
	local_cust1 = "_empty_";
	}
	reference_len += strlen(local_cust1);

	if (local_cust2 == NULL) {
	local_cust2 = "_empty_";
	}
	reference_len += strlen(local_cust2);

	since_epoch = calloc(1, reference_len);

	if (since_epoch != NULL) {
	sprintf(since_epoch, "%s-%s-%lu-%u",
	local_cust1, local_cust2, (unsigned long)time(NULL), ref_counter++);
	}

	return since_epoch;
	}

	xmlNode *
	create_request_adv(const char task, xmlNode msg_data,
	const char host_to, const char sys_to,
	const char sys_from, const char uuid_from, const char *origin)
	{
	char *true_from = NULL;
	xmlNode *request = NULL;
	char *reference = generateReference(task, sys_from);

	if (uuid_from != NULL) {
	true_from = generate_hash_key(sys_from, uuid_from);
	} else if (sys_from != NULL) {
	true_from = strdup(sys_from);
	} else {
	crm_err("No sys from specified");
	}

	/* host_from will get set for us if necessary by CRMd when routed */
	request = create_xml_node(NULL, __FUNCTION__);
	crm_xml_add(request, F_CRM_ORIGIN, origin);
	crm_xml_add(request, F_TYPE, T_CRM);
	crm_xml_add(request, F_CRM_VERSION, CRM_FEATURE_SET);
	crm_xml_add(request, F_CRM_MSG_TYPE, XML_ATTR_REQUEST);
	crm_xml_add(request, F_CRM_REFERENCE, reference);
	crm_xml_add(request, F_CRM_TASK, task);
	crm_xml_add(request, F_CRM_SYS_TO, sys_to);
	crm_xml_add(request, F_CRM_SYS_FROM, true_from);

	/* HOSTTO will be ignored if it is to the DC anyway. */
	if (host_to != NULL && strlen(host_to) > 0) {
	crm_xml_add(request, F_CRM_HOST_TO, host_to);
	}

	if (msg_data != NULL) {
	add_message_xml(request, F_CRM_DATA, msg_data);
	}
	free(reference);
	free(true_from);

	return request;
	}

	/*
	* This method adds a copy of xml_response_data
	*/
	xmlNode *
	create_reply_adv(xmlNode * original_request, xmlNode * xml_response_data, const char *origin)
	{
	xmlNode *reply = NULL;

	const char *host_from = crm_element_value(original_request, F_CRM_HOST_FROM);
	const char *sys_from = crm_element_value(original_request, F_CRM_SYS_FROM);
	const char *sys_to = crm_element_value(original_request, F_CRM_SYS_TO);
	const char *type = crm_element_value(original_request, F_CRM_MSG_TYPE);
	const char *operation = crm_element_value(original_request, F_CRM_TASK);
	const char *crm_msg_reference = crm_element_value(original_request, F_CRM_REFERENCE);

	if (type == NULL) {
	crm_err("Cannot create new_message, no message type in original message");
	CRM_ASSERT(type != NULL);
	return NULL;
	#if 0
	} else if (strcasecmp(XML_ATTR_REQUEST, type) != 0) {
	crm_err("Cannot create new_message, original message was not a request");
	return NULL;
	#endif
	}
	reply = create_xml_node(NULL, __FUNCTION__);
	if (reply == NULL) {
	crm_err("Cannot create new_message, malloc failed");
	return NULL;
	}

	crm_xml_add(reply, F_CRM_ORIGIN, origin);
	crm_xml_add(reply, F_TYPE, T_CRM);
	crm_xml_add(reply, F_CRM_VERSION, CRM_FEATURE_SET);
	crm_xml_add(reply, F_CRM_MSG_TYPE, XML_ATTR_RESPONSE);
	crm_xml_add(reply, F_CRM_REFERENCE, crm_msg_reference);
	crm_xml_add(reply, F_CRM_TASK, operation);

	/* since this is a reply, we reverse the from and to */
	crm_xml_add(reply, F_CRM_SYS_TO, sys_from);
	crm_xml_add(reply, F_CRM_SYS_FROM, sys_to);

	/* HOSTTO will be ignored if it is to the DC anyway. */
	if (host_from != NULL && strlen(host_from) > 0) {
	crm_xml_add(reply, F_CRM_HOST_TO, host_from);
	}

	if (xml_response_data != NULL) {
	add_message_xml(reply, F_CRM_DATA, xml_response_data);
	}

	return reply;
	}

	/* Libqb based IPC */

	/* Server... */

	GHashTable *client_connections = NULL;

	crm_client_t *
	crm_client_get(qb_ipcs_connection_t * c)
	{
	if (client_connections) {
	return g_hash_table_lookup(client_connections, c);
	}

	crm_trace("No client found for %p", c);
	return NULL;
	}

	crm_client_t *
	crm_client_get_by_id(const char *id)
	{
	gpointer key;
	crm_client_t *client;
	GHashTableIter iter;

	if (client_connections && id) {
	g_hash_table_iter_init(&iter, client_connections);
	while (g_hash_table_iter_next(&iter, &key, (gpointer *) & client)) {
	if (strcmp(client->id, id) == 0) {
	return client;
	}
	}
	}

	crm_trace("No client found with id=%s", id);
	return NULL;
	}

	const char *
	crm_client_name(crm_client_t * c)
	{
	if (c == NULL) {
	return "null";
	} else if (c->name == NULL && c->id == NULL) {
	return "unknown";
	} else if (c->name == NULL) {
	return c->id;
	} else {
	return c->name;
	}
	}

	void
	crm_client_init(void)
	{
	if (client_connections == NULL) {
	crm_trace("Creating client hash table");
	client_connections = g_hash_table_new(g_direct_hash, g_direct_equal);
	}
	}

	void
	crm_client_cleanup(void)
	{
	if (client_connections != NULL) {
	int active = g_hash_table_size(client_connections);

	if (active) {
	crm_err("Exiting with %d active connections", active);
	}
	g_hash_table_destroy(client_connections); client_connections = NULL;
	}
	}

	void
	crm_client_disconnect_all(qb_ipcs_service_t *service)
	{
	qb_ipcs_connection_t *c = NULL;

	if (service == NULL) {
	return;
	}

	c = qb_ipcs_connection_first_get(service);

	while (c != NULL) {
	qb_ipcs_connection_t *last = c;

	c = qb_ipcs_connection_next_get(service, 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);
	}
	}

	crm_client_t *
	crm_client_new(qb_ipcs_connection_t * c, uid_t uid_client, gid_t gid_client)
	{
	- static uid_t uid_server = 0;
	static gid_t gid_cluster = 0;

	crm_client_t *client = NULL;

	CRM_LOG_ASSERT(c);
	if (c == NULL) {
	return NULL;
	}

	if (gid_cluster == 0) {
	- uid_server = getuid();
	if(crm_user_lookup(CRM_DAEMON_USER, NULL, &gid_cluster) < 0) {
	static bool have_error = FALSE;
	if(have_error == FALSE) {
	crm_warn("Could not find group for user %s", CRM_DAEMON_USER);
	have_error = TRUE;
	}
	}
	}

	- if(gid_cluster != 0 && gid_client != 0) {
	- uid_t best_uid = -1; /* Passing -1 to chown(2) means don't change */
	-
	- if(uid_client == 0 \|\| uid_server == 0) { /* Someone is priveliged, but the other may not be */
	- best_uid = QB_MAX(uid_client, uid_server);
	- crm_trace("Allowing user %u to clean up after disconnect", best_uid);
	- }
	-
	+ if (uid_client != 0) {
	crm_trace("Giving access to group %u", gid_cluster);
	- qb_ipcs_connection_auth_set(c, best_uid, gid_cluster, S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP);
	+ /* Passing -1 to chown(2) means don't change */
	+ qb_ipcs_connection_auth_set(c, -1, gid_cluster, S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP);
	}

	crm_client_init();

	/* TODO: Do our own auth checking, return NULL if unauthorized */
	client = calloc(1, sizeof(crm_client_t));

	client->ipcs = c;
	client->kind = CRM_CLIENT_IPC;
	client->pid = crm_ipcs_client_pid(c);

	client->id = crm_generate_uuid();

	crm_debug("Connecting %p for uid=%d gid=%d pid=%u id=%s", c, uid_client, gid_client, client->pid, client->id);

	#if ENABLE_ACL
	client->user = uid2username(uid_client);
	#endif

	g_hash_table_insert(client_connections, c, client);
	return client;
	}

	void
	crm_client_destroy(crm_client_t * c)
	{
	if (c == NULL) {
	return;
	}

	if (client_connections) {
	if (c->ipcs) {
	crm_trace("Destroying %p/%p (%d remaining)",
	c, c->ipcs, crm_hash_table_size(client_connections) - 1);
	g_hash_table_remove(client_connections, c->ipcs);

	} else {
	crm_trace("Destroying remote connection %p (%d remaining)",
	c, crm_hash_table_size(client_connections) - 1);
	g_hash_table_remove(client_connections, c->id);
	}
	}

	if (c->event_timer) {
	g_source_remove(c->event_timer);
	}

	crm_debug("Destroying %d events", g_list_length(c->event_queue));
	while (c->event_queue) {
	struct iovec *event = c->event_queue->data;

	c->event_queue = g_list_remove(c->event_queue, event);
	free(event[0].iov_base);
	free(event[1].iov_base);
	free(event);
	}

	free(c->id);
	free(c->name);
	free(c->user);
	if (c->remote) {
	if (c->remote->auth_timeout) {
	g_source_remove(c->remote->auth_timeout);
	}
	free(c->remote->buffer);
	free(c->remote);
	}
	free(c);
	}

	int
	crm_ipcs_client_pid(qb_ipcs_connection_t * c)
	{
	struct qb_ipcs_connection_stats stats;

	stats.client_pid = 0;
	qb_ipcs_connection_stats_get(c, &stats, 0);
	return stats.client_pid;
	}

	xmlNode *
	crm_ipcs_recv(crm_client_t * c, void data, size_t size, uint32_t id, uint32_t * flags)
	{
	xmlNode *xml = NULL;
	char *uncompressed = NULL;
	char text = ((char )data) + sizeof(struct crm_ipc_response_header);
	struct crm_ipc_response_header *header = data;

	if (id) {
	id = ((struct qb_ipc_response_header )data)->id;
	}
	if (flags) {
	*flags = header->flags;
	}

	if (is_set(header->flags, crm_ipc_proxied)) {
	/* mark this client as being the endpoint of a proxy connection.
	* Proxy connections responses are sent on the event channel to avoid
	* blocking the proxy daemon (crmd) */
	c->flags \|= crm_client_flag_ipc_proxied;
	}

	if(header->version > PCMK_IPC_VERSION) {
	crm_err("Filtering incompatible v%d IPC message, we only support versions <= %d",
	header->version, PCMK_IPC_VERSION);
	return NULL;
	}

	if (header->size_compressed) {
	int rc = 0;
	unsigned int size_u = 1 + header->size_uncompressed;
	uncompressed = calloc(1, size_u);

	crm_trace("Decompressing message data %u bytes into %u bytes",
	header->size_compressed, size_u);

	rc = BZ2_bzBuffToBuffDecompress(uncompressed, &size_u, text, header->size_compressed, 1, 0);
	text = uncompressed;

	if (rc != BZ_OK) {
	crm_err("Decompression failed: %s (%d)", bz2_strerror(rc), rc);
	free(uncompressed);
	return NULL;
	}
	}

	CRM_ASSERT(text[header->size_uncompressed - 1] == 0);

	crm_trace("Received %.200s", text);
	xml = string2xml(text);

	free(uncompressed);
	return xml;
	}

	ssize_t crm_ipcs_flush_events(crm_client_t * c);

	static gboolean
	crm_ipcs_flush_events_cb(gpointer data)
	{
	crm_client_t *c = data;

	c->event_timer = 0;
	crm_ipcs_flush_events(c);
	return FALSE;
	}

	ssize_t
	crm_ipcs_flush_events(crm_client_t * c)
	{
	int sent = 0;
	ssize_t rc = 0;
	int queue_len = 0;

	if (c == NULL) {
	return pcmk_ok;

	} else if (c->event_timer) {
	/* There is already a timer, wait until it goes off */
	crm_trace("Timer active for %p - %d", c->ipcs, c->event_timer);
	return pcmk_ok;
	}

	queue_len = g_list_length(c->event_queue);
	while (c->event_queue && sent < 100) {
	struct crm_ipc_response_header *header = NULL;
	struct iovec *event = c->event_queue->data;

	rc = qb_ipcs_event_sendv(c->ipcs, event, 2);
	if (rc < 0) {
	break;
	}

	sent++;
	header = event[0].iov_base;
	if (header->size_compressed) {
	crm_trace("Event %d to %p[%d] (%lld compressed bytes) sent",
	header->qb.id, c->ipcs, c->pid, (long long) rc);
	} else {
	crm_trace("Event %d to %p[%d] (%lld bytes) sent: %.120s",
	header->qb.id, c->ipcs, c->pid, (long long) rc,
	(char *) (event[1].iov_base));
	}

	c->event_queue = g_list_remove(c->event_queue, event);
	free(event[0].iov_base);
	free(event[1].iov_base);
	free(event);
	}

	queue_len -= sent;
	if (sent > 0 \|\| c->event_queue) {
	crm_trace("Sent %d events (%d remaining) for %p[%d]: %s (%lld)",
	sent, queue_len, c->ipcs, c->pid,
	pcmk_strerror(rc < 0 ? rc : 0), (long long) rc);
	}

	if (c->event_queue) {
	if (queue_len % 100 == 0 && queue_len > 99) {
	crm_warn("Event queue for %p[%d] has grown to %d", c->ipcs, c->pid, queue_len);

	} else if (queue_len > 500) {
	crm_err("Evicting slow client %p[%d]: event queue reached %d entries",
	c->ipcs, c->pid, queue_len);
	qb_ipcs_disconnect(c->ipcs);
	return rc;
	}

	c->event_timer = g_timeout_add(1000 + 100 * queue_len, crm_ipcs_flush_events_cb, c);
	}

	return rc;
	}

	ssize_t
	crm_ipc_prepare(uint32_t request, xmlNode * message, struct iovec ** result, uint32_t max_send_size)
	{
	static unsigned int biggest = 0;
	struct iovec *iov;
	unsigned int total = 0;
	char *compressed = NULL;
	char *buffer = dump_xml_unformatted(message);
	struct crm_ipc_response_header *header = calloc(1, sizeof(struct crm_ipc_response_header));

	CRM_ASSERT(result != NULL);

	crm_ipc_init();

	if (max_send_size == 0) {
	max_send_size = ipc_buffer_max;
	}

	CRM_LOG_ASSERT(max_send_size != 0);

	*result = NULL;
	iov = calloc(2, sizeof(struct iovec));


	iov[0].iov_len = hdr_offset;
	iov[0].iov_base = header;

	header->version = PCMK_IPC_VERSION;
	header->size_uncompressed = 1 + strlen(buffer);
	total = iov[0].iov_len + header->size_uncompressed;

	if (total < max_send_size) {
	iov[1].iov_base = buffer;
	iov[1].iov_len = header->size_uncompressed;

	} else {
	unsigned int new_size = 0;

	if (crm_compress_string
	(buffer, header->size_uncompressed, max_send_size, &compressed, &new_size)) {

	header->flags \|= crm_ipc_compressed;
	header->size_compressed = new_size;

	iov[1].iov_len = header->size_compressed;
	iov[1].iov_base = compressed;

	free(buffer);

	biggest = QB_MAX(header->size_compressed, biggest);

	} else {
	ssize_t rc = -EMSGSIZE;

	crm_log_xml_trace(message, "EMSGSIZE");
	biggest = QB_MAX(header->size_uncompressed, biggest);

	crm_err
	("Could not compress the message (%u bytes) into less than the configured ipc limit (%u bytes). "
	"Set PCMK_ipc_buffer to a higher value (%u bytes suggested)",
	header->size_uncompressed, max_send_size, 4 * biggest);

	free(compressed);
	free(buffer);
	free(header);
	free(iov);

	return rc;
	}
	}

	header->qb.size = iov[0].iov_len + iov[1].iov_len;
	header->qb.id = (int32_t)request; /* Replying to a specific request */

	*result = iov;
	CRM_ASSERT(header->qb.size > 0);
	return header->qb.size;
	}

	ssize_t
	crm_ipcs_sendv(crm_client_t * c, struct iovec * iov, enum crm_ipc_flags flags)
	{
	ssize_t rc;
	static uint32_t id = 1;
	struct crm_ipc_response_header *header = iov[0].iov_base;

	if (c->flags & crm_client_flag_ipc_proxied) {
	/* _ALL_ replies to proxied connections need to be sent as events */
	if (is_not_set(flags, crm_ipc_server_event)) {
	flags \|= crm_ipc_server_event;
	/* this flag lets us know this was originally meant to be a response.
	* even though we're sending it over the event channel. */
	flags \|= crm_ipc_proxied_relay_response;
	}
	}

	header->flags \|= flags;
	if (flags & crm_ipc_server_event) {
	header->qb.id = id++; /* We don't really use it, but doesn't hurt to set one */

	if (flags & crm_ipc_server_free) {
	crm_trace("Sending the original to %p[%d]", c->ipcs, c->pid);
	c->event_queue = g_list_append(c->event_queue, iov);

	} else {
	struct iovec *iov_copy = calloc(2, sizeof(struct iovec));

	crm_trace("Sending a copy to %p[%d]", c->ipcs, c->pid);
	iov_copy[0].iov_len = iov[0].iov_len;
	iov_copy[0].iov_base = malloc(iov[0].iov_len);
	memcpy(iov_copy[0].iov_base, iov[0].iov_base, iov[0].iov_len);

	iov_copy[1].iov_len = iov[1].iov_len;
	iov_copy[1].iov_base = malloc(iov[1].iov_len);
	memcpy(iov_copy[1].iov_base, iov[1].iov_base, iov[1].iov_len);

	c->event_queue = g_list_append(c->event_queue, iov_copy);
	}

	} else {
	CRM_LOG_ASSERT(header->qb.id != 0); /* Replying to a specific request */

	rc = qb_ipcs_response_sendv(c->ipcs, iov, 2);
	if (rc < header->qb.size) {
	crm_notice("Response %d to %p[%d] (%u bytes) failed: %s (%d)",
	header->qb.id, c->ipcs, c->pid, header->qb.size, pcmk_strerror(rc), rc);

	} else {
	crm_trace("Response %d sent, %lld bytes to %p[%d]",
	header->qb.id, (long long) rc, c->ipcs, c->pid);
	}

	if (flags & crm_ipc_server_free) {
	free(iov[0].iov_base);
	free(iov[1].iov_base);
	free(iov);
	}
	}

	if (flags & crm_ipc_server_event) {
	rc = crm_ipcs_flush_events(c);
	} else {
	crm_ipcs_flush_events(c);
	}

	if (rc == -EPIPE \|\| rc == -ENOTCONN) {
	crm_trace("Client %p disconnected", c->ipcs);
	}

	return rc;
	}

	ssize_t
	crm_ipcs_send(crm_client_t * c, uint32_t request, xmlNode * message,
	enum crm_ipc_flags flags)
	{
	struct iovec *iov = NULL;
	ssize_t rc = 0;

	if(c == NULL) {
	return -EDESTADDRREQ;
	}
	crm_ipc_init();

	rc = crm_ipc_prepare(request, message, &iov, ipc_buffer_max);
	if (rc > 0) {
	rc = crm_ipcs_sendv(c, iov, flags \| crm_ipc_server_free);

	} else {
	free(iov);
	crm_notice("Message to %p[%d] failed: %s (%d)",
	c->ipcs, c->pid, pcmk_strerror(rc), rc);
	}

	return rc;
	}

	void
	crm_ipcs_send_ack(crm_client_t * c, uint32_t request, uint32_t flags, const char tag, const char function,
	int line)
	{
	if (flags & crm_ipc_client_response) {
	xmlNode *ack = create_xml_node(NULL, tag);

	crm_trace("Ack'ing msg from %s (%p)", crm_client_name(c), c);
	c->request_id = 0;
	crm_xml_add(ack, "function", function);
	crm_xml_add_int(ack, "line", line);
	crm_ipcs_send(c, request, ack, flags);
	free_xml(ack);
	}
	}

	/* Client... */

	#define MIN_MSG_SIZE 12336 /* sizeof(struct qb_ipc_connection_response) */
	#define MAX_MSG_SIZE 1281024 / 128k default */

	struct crm_ipc_s {
	struct pollfd pfd;

	/* the max size we can send/receive over ipc */
	unsigned int max_buf_size;
	/* Size of the allocated 'buffer' */
	unsigned int buf_size;
	int msg_size;
	int need_reply;
	char *buffer;
	char *name;
	uint32_t buffer_flags;

	qb_ipcc_connection_t *ipc;

	};

	static unsigned int
	pick_ipc_buffer(unsigned int max)
	{
	static unsigned int global_max = 0;

	if (global_max == 0) {
	const char *env = getenv("PCMK_ipc_buffer");

	if (env) {
	int env_max = crm_parse_int(env, "0");

	global_max = (env_max > 0)? QB_MAX(MIN_MSG_SIZE, env_max) : MAX_MSG_SIZE;

	} else {
	global_max = MAX_MSG_SIZE;
	}
	}

	return QB_MAX(max, global_max);
	}

	crm_ipc_t *
	crm_ipc_new(const char *name, size_t max_size)
	{
	crm_ipc_t *client = NULL;

	client = calloc(1, sizeof(crm_ipc_t));

	client->name = strdup(name);
	client->buf_size = pick_ipc_buffer(max_size);
	client->buffer = malloc(client->buf_size);

	/* Clients initiating connection pick the max buf size */
	client->max_buf_size = client->buf_size;

	client->pfd.fd = -1;
	client->pfd.events = POLLIN;
	client->pfd.revents = 0;

	return client;
	}

	/*!
	* \brief Establish an IPC connection to a Pacemaker component
	*
	* \param[in] client Connection instance obtained from crm_ipc_new()
	*
	* \return TRUE on success, FALSE otherwise (in which case errno will be set)
	*/
	bool
	crm_ipc_connect(crm_ipc_t * client)
	{
	client->need_reply = FALSE;
	client->ipc = qb_ipcc_connect(client->name, client->buf_size);

	if (client->ipc == NULL) {
	crm_debug("Could not establish %s connection: %s (%d)", client->name, pcmk_strerror(errno), errno);
	return FALSE;
	}

	client->pfd.fd = crm_ipc_get_fd(client);
	if (client->pfd.fd < 0) {
	crm_debug("Could not obtain file descriptor for %s connection: %s (%d)", client->name, pcmk_strerror(errno), errno);
	return FALSE;
	}

	qb_ipcc_context_set(client->ipc, client);

	#ifdef HAVE_IPCS_GET_BUFFER_SIZE
	client->max_buf_size = qb_ipcc_get_buffer_size(client->ipc);
	if (client->max_buf_size > client->buf_size) {
	free(client->buffer);
	client->buffer = calloc(1, client->max_buf_size);
	client->buf_size = client->max_buf_size;
	}
	#endif

	return TRUE;
	}

	void
	crm_ipc_close(crm_ipc_t * client)
	{
	if (client) {
	crm_trace("Disconnecting %s IPC connection %p (%p)", client->name, client, client->ipc);

	if (client->ipc) {
	qb_ipcc_connection_t *ipc = client->ipc;

	client->ipc = NULL;
	qb_ipcc_disconnect(ipc);
	}
	}
	}

	void
	crm_ipc_destroy(crm_ipc_t * client)
	{
	if (client) {
	if (client->ipc && qb_ipcc_is_connected(client->ipc)) {
	crm_notice("Destroying an active IPC connection to %s", client->name);
	/* The next line is basically unsafe
	*
	* If this connection was attached to mainloop and mainloop is active,
	* the 'disconnected' callback will end up back here and we'll end
	* up free'ing the memory twice - something that can still happen
	* even without this if we destroy a connection and it closes before
	* we call exit
	*/
	/* crm_ipc_close(client); */
	}
	crm_trace("Destroying IPC connection to %s: %p", client->name, client);
	free(client->buffer);
	free(client->name);
	free(client);
	}
	}

	int
	crm_ipc_get_fd(crm_ipc_t * client)
	{
	int fd = 0;

	if (client && client->ipc && (qb_ipcc_fd_get(client->ipc, &fd) == 0)) {
	return fd;
	}
	errno = EINVAL;
	crm_perror(LOG_ERR, "Could not obtain file IPC descriptor for %s",
	(client? client->name : "unspecified client"));
	return -errno;
	}

	bool
	crm_ipc_connected(crm_ipc_t * client)
	{
	bool rc = FALSE;

	if (client == NULL) {
	crm_trace("No client");
	return FALSE;

	} else if (client->ipc == NULL) {
	crm_trace("No connection");
	return FALSE;

	} else if (client->pfd.fd < 0) {
	crm_trace("Bad descriptor");
	return FALSE;
	}

	rc = qb_ipcc_is_connected(client->ipc);
	if (rc == FALSE) {
	client->pfd.fd = -EINVAL;
	}
	return rc;
	}

	/*!
	* \brief Check whether an IPC connection is ready to be read
	*
	* \param[in] client Connection to check
	*
	* \return Positive value if ready to be read, 0 if not ready, -errno on error
	*/
	int
	crm_ipc_ready(crm_ipc_t *client)
	{
	int rc;

	CRM_ASSERT(client != NULL);

	if (crm_ipc_connected(client) == FALSE) {
	return -ENOTCONN;
	}

	client->pfd.revents = 0;
	rc = poll(&(client->pfd), 1, 0);
	return (rc < 0)? -errno : rc;
	}

	static int
	crm_ipc_decompress(crm_ipc_t * client)
	{
	struct crm_ipc_response_header header = (struct crm_ipc_response_header )(void*)client->buffer;

	if (header->size_compressed) {
	int rc = 0;
	unsigned int size_u = 1 + header->size_uncompressed;
	/* never let buf size fall below our max size required for ipc reads. */
	unsigned int new_buf_size = QB_MAX((hdr_offset + size_u), client->max_buf_size);
	char *uncompressed = calloc(1, new_buf_size);

	crm_trace("Decompressing message data %u bytes into %u bytes",
	header->size_compressed, size_u);

	rc = BZ2_bzBuffToBuffDecompress(uncompressed + hdr_offset, &size_u,
	client->buffer + hdr_offset, header->size_compressed, 1, 0);

	if (rc != BZ_OK) {
	crm_err("Decompression failed: %s (%d)", bz2_strerror(rc), rc);
	free(uncompressed);
	return -EILSEQ;
	}

	/*
	* This assert no longer holds true. For an identical msg, some clients may
	* require compression, and others may not. If that same msg (event) is sent
	* to multiple clients, it could result in some clients receiving a compressed
	* msg even though compression was not explicitly required for them.
	*
	* CRM_ASSERT((header->size_uncompressed + hdr_offset) >= ipc_buffer_max);
	*/
	CRM_ASSERT(size_u == header->size_uncompressed);

	memcpy(uncompressed, client->buffer, hdr_offset); /* Preserve the header */
	header = (struct crm_ipc_response_header )(void)uncompressed;

	free(client->buffer);
	client->buf_size = new_buf_size;
	client->buffer = uncompressed;
	}

	CRM_ASSERT(client->buffer[hdr_offset + header->size_uncompressed - 1] == 0);
	return pcmk_ok;
	}

	long
	crm_ipc_read(crm_ipc_t * client)
	{
	struct crm_ipc_response_header *header = NULL;

	CRM_ASSERT(client != NULL);
	CRM_ASSERT(client->ipc != NULL);
	CRM_ASSERT(client->buffer != NULL);

	crm_ipc_init();

	client->buffer[0] = 0;
	client->msg_size = qb_ipcc_event_recv(client->ipc, client->buffer, client->buf_size - 1, 0);
	if (client->msg_size >= 0) {
	int rc = crm_ipc_decompress(client);

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

	header = (struct crm_ipc_response_header )(void)client->buffer;
	if(header->version > PCMK_IPC_VERSION) {
	crm_err("Filtering incompatible v%d IPC message, we only support versions <= %d",
	header->version, PCMK_IPC_VERSION);
	return -EBADMSG;
	}

	crm_trace("Received %s event %d, size=%u, rc=%d, text: %.100s",
	client->name, header->qb.id, header->qb.size, client->msg_size,
	client->buffer + hdr_offset);

	} else {
	crm_trace("No message from %s received: %s", client->name, pcmk_strerror(client->msg_size));
	}

	if (crm_ipc_connected(client) == FALSE \|\| client->msg_size == -ENOTCONN) {
	crm_err("Connection to %s failed", client->name);
	}

	if (header) {
	/* Data excluding the header */
	return header->size_uncompressed;
	}
	return -ENOMSG;
	}

	const char *
	crm_ipc_buffer(crm_ipc_t * client)
	{
	CRM_ASSERT(client != NULL);
	return client->buffer + sizeof(struct crm_ipc_response_header);
	}

	uint32_t
	crm_ipc_buffer_flags(crm_ipc_t * client)
	{
	struct crm_ipc_response_header *header = NULL;

	CRM_ASSERT(client != NULL);
	if (client->buffer == NULL) {
	return 0;
	}

	header = (struct crm_ipc_response_header )(void)client->buffer;
	return header->flags;
	}

	const char *
	crm_ipc_name(crm_ipc_t * client)
	{
	CRM_ASSERT(client != NULL);
	return client->name;
	}

	static int
	internal_ipc_send_recv(crm_ipc_t * client, const void *iov)
	{
	int rc = 0;

	do {
	rc = qb_ipcc_sendv_recv(client->ipc, iov, 2, client->buffer, client->buf_size, -1);
	} while (rc == -EAGAIN && crm_ipc_connected(client));

	return rc;
	}

	static int
	internal_ipc_send_request(crm_ipc_t * client, const void *iov, int ms_timeout)
	{
	int rc = 0;
	time_t timeout = time(NULL) + 1 + (ms_timeout / 1000);

	do {
	rc = qb_ipcc_sendv(client->ipc, iov, 2);
	} while (rc == -EAGAIN && time(NULL) < timeout && crm_ipc_connected(client));

	return rc;
	}

	static int
	internal_ipc_get_reply(crm_ipc_t * client, int request_id, int ms_timeout)
	{
	time_t timeout = time(NULL) + 1 + (ms_timeout / 1000);
	int rc = 0;

	crm_ipc_init();

	/* get the reply */
	crm_trace("client %s waiting on reply to msg id %d", client->name, request_id);
	do {

	rc = qb_ipcc_recv(client->ipc, client->buffer, client->buf_size, 1000);
	if (rc > 0) {
	struct crm_ipc_response_header *hdr = NULL;

	int rc = crm_ipc_decompress(client);

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

	hdr = (struct crm_ipc_response_header )(void)client->buffer;
	if (hdr->qb.id == request_id) {
	/* Got it */
	break;
	} else if (hdr->qb.id < request_id) {
	xmlNode *bad = string2xml(crm_ipc_buffer(client));

	crm_err("Discarding old reply %d (need %d)", hdr->qb.id, request_id);
	crm_log_xml_notice(bad, "OldIpcReply");

	} else {
	xmlNode *bad = string2xml(crm_ipc_buffer(client));

	crm_err("Discarding newer reply %d (need %d)", hdr->qb.id, request_id);
	crm_log_xml_notice(bad, "ImpossibleReply");
	CRM_ASSERT(hdr->qb.id <= request_id);
	}
	} else if (crm_ipc_connected(client) == FALSE) {
	crm_err("Server disconnected client %s while waiting for msg id %d", client->name,
	request_id);
	break;
	}

	} while (time(NULL) < timeout);

	return rc;
	}

	int
	crm_ipc_send(crm_ipc_t * client, xmlNode * message, enum crm_ipc_flags flags, int32_t ms_timeout,
	xmlNode ** reply)
	{
	long rc = 0;
	struct iovec *iov;
	static uint32_t id = 0;
	static int factor = 8;
	struct crm_ipc_response_header *header;

	crm_ipc_init();

	if (client == NULL) {
	crm_notice("Invalid connection");
	return -ENOTCONN;

	} else if (crm_ipc_connected(client) == FALSE) {
	/* Don't even bother */
	crm_notice("Connection to %s closed", client->name);
	return -ENOTCONN;
	}

	if (ms_timeout == 0) {
	ms_timeout = 5000;
	}

	if (client->need_reply) {
	crm_trace("Trying again to obtain pending reply from %s", client->name);
	rc = qb_ipcc_recv(client->ipc, client->buffer, client->buf_size, ms_timeout);
	if (rc < 0) {
	crm_warn("Sending to %s (%p) is disabled until pending reply is received", client->name,
	client->ipc);
	return -EALREADY;

	} else {
	crm_notice("Lost reply from %s (%p) finally arrived, sending re-enabled", client->name,
	client->ipc);
	client->need_reply = FALSE;
	}
	}

	id++;
	CRM_LOG_ASSERT(id != 0); /* Crude wrap-around detection */
	rc = crm_ipc_prepare(id, message, &iov, client->max_buf_size);
	if(rc < 0) {
	return rc;
	}

	header = iov[0].iov_base;
	header->flags \|= flags;

	if(is_set(flags, crm_ipc_proxied)) {
	/* Don't look for a synchronous response */
	clear_bit(flags, crm_ipc_client_response);
	}

	if(header->size_compressed) {
	if(factor < 10 && (client->max_buf_size / 10) < (rc / factor)) {
	crm_notice("Compressed message exceeds %d0%% of the configured ipc limit (%u bytes), "
	"consider setting PCMK_ipc_buffer to %u or higher",
	factor, client->max_buf_size, 2 * client->max_buf_size);
	factor++;
	}
	}

	crm_trace("Sending from client: %s request id: %d bytes: %u timeout:%d msg...",
	client->name, header->qb.id, header->qb.size, ms_timeout);

	if (ms_timeout > 0 \|\| is_not_set(flags, crm_ipc_client_response)) {

	rc = internal_ipc_send_request(client, iov, ms_timeout);

	if (rc <= 0) {
	crm_trace("Failed to send from client %s request %d with %u bytes...",
	client->name, header->qb.id, header->qb.size);
	goto send_cleanup;

	} else if (is_not_set(flags, crm_ipc_client_response)) {
	crm_trace("Message sent, not waiting for reply to %d from %s to %u bytes...",
	header->qb.id, client->name, header->qb.size);

	goto send_cleanup;
	}

	rc = internal_ipc_get_reply(client, header->qb.id, ms_timeout);
	if (rc < 0) {
	/* No reply, for now, disable sending
	*
	* The alternative is to close the connection since we don't know
	* how to detect and discard out-of-sequence replies
	*
	* TODO - implement the above
	*/
	client->need_reply = TRUE;
	}

	} else {
	rc = internal_ipc_send_recv(client, iov);
	}

	if (rc > 0) {
	struct crm_ipc_response_header hdr = (struct crm_ipc_response_header )(void*)client->buffer;

	crm_trace("Received response %d, size=%u, rc=%ld, text: %.200s", hdr->qb.id, hdr->qb.size,
	rc, crm_ipc_buffer(client));

	if (reply) {
	*reply = string2xml(crm_ipc_buffer(client));
	}

	} else {
	crm_trace("Response not received: rc=%ld, errno=%d", rc, errno);
	}

	send_cleanup:
	if (crm_ipc_connected(client) == FALSE) {
	crm_notice("Connection to %s closed: %s (%ld)", client->name, pcmk_strerror(rc), rc);

	} else if (rc == -ETIMEDOUT) {
	crm_warn("Request %d to %s (%p) failed: %s (%ld) after %dms",
	header->qb.id, client->name, client->ipc, pcmk_strerror(rc), rc, ms_timeout);
	crm_write_blackbox(0, NULL);

	} else if (rc <= 0) {
	crm_warn("Request %d to %s (%p) failed: %s (%ld)",
	header->qb.id, client->name, client->ipc, pcmk_strerror(rc), rc);
	}

	free(header);
	free(iov[1].iov_base);
	free(iov);
	return rc;
	}

	/* Utils */

	xmlNode *
	create_hello_message(const char *uuid,
	const char client_name, const char major_version, const char *minor_version)
	{
	xmlNode *hello_node = NULL;
	xmlNode *hello = NULL;

	if (uuid == NULL \|\| strlen(uuid) == 0
	\|\| client_name == NULL \|\| strlen(client_name) == 0
	\|\| major_version == NULL \|\| strlen(major_version) == 0
	\|\| minor_version == NULL \|\| strlen(minor_version) == 0) {
	crm_err("Missing fields, Hello message will not be valid.");
	return NULL;
	}

	hello_node = create_xml_node(NULL, XML_TAG_OPTIONS);
	crm_xml_add(hello_node, "major_version", major_version);
	crm_xml_add(hello_node, "minor_version", minor_version);
	crm_xml_add(hello_node, "client_name", client_name);
	crm_xml_add(hello_node, "client_uuid", uuid);

	crm_trace("creating hello message");
	hello = create_request(CRM_OP_HELLO, hello_node, NULL, NULL, client_name, uuid);
	free_xml(hello_node);

	return hello;
	}

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