ipc_glue.c
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ipc_glue.c
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	/*
	* Copyright (c) 2010-2017 Red Hat, Inc.
	*
	* All rights reserved.
	*
	* Author: Angus Salkeld <asalkeld@redhat.com>
	*
	* This software licensed under BSD license, the text of which follows:
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* - Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	* - Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	* - Neither the name of Red Hat, Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from this
	* software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include <config.h>

	#include <stdlib.h>
	#include <stdio.h>
	#include <errno.h>
	#include <assert.h>
	#include <sys/uio.h>
	#include <string.h>

	#include <qb/qbdefs.h>
	#include <qb/qblist.h>
	#include <qb/qbutil.h>
	#include <qb/qbloop.h>
	#include <qb/qbipcs.h>

	#include <corosync/swab.h>
	#include <corosync/corotypes.h>
	#include <corosync/corodefs.h>
	#include <corosync/totem/totempg.h>
	#include <corosync/logsys.h>
	#include <corosync/icmap.h>

	#include "sync.h"
	#include "timer.h"
	#include "main.h"
	#include "util.h"
	#include "apidef.h"
	#include "service.h"
	#include "ipcs_stats.h"
	#include "stats.h"

	LOGSYS_DECLARE_SUBSYS ("MAIN");

	static struct corosync_api_v1 *api = NULL;
	static int32_t ipc_not_enough_fds_left = 0;
	static int32_t ipc_fc_is_quorate; /* boolean */
	static int32_t ipc_fc_totem_queue_level; /* percentage used */
	static int32_t ipc_fc_sync_in_process; /* boolean */
	static int32_t ipc_allow_connections = 0; /* boolean */

	#define CS_IPCS_MAPPER_SERV_NAME 256

	struct cs_ipcs_mapper {
	int32_t id;
	qb_ipcs_service_t *inst;
	char name[CS_IPCS_MAPPER_SERV_NAME];
	};

	struct outq_item {
	void *msg;
	size_t mlen;
	struct qb_list_head list;
	};

	static struct cs_ipcs_mapper ipcs_mapper[SERVICES_COUNT_MAX];

	static int32_t cs_ipcs_job_add(enum qb_loop_priority p, void *data, qb_loop_job_dispatch_fn fn);
	static int32_t cs_ipcs_dispatch_add(enum qb_loop_priority p, int32_t fd, int32_t events,
	void *data, qb_ipcs_dispatch_fn_t fn);
	static int32_t cs_ipcs_dispatch_mod(enum qb_loop_priority p, int32_t fd, int32_t events,
	void *data, qb_ipcs_dispatch_fn_t fn);
	static int32_t cs_ipcs_dispatch_del(int32_t fd);
	static void outq_flush (void *data);


	static struct qb_ipcs_poll_handlers corosync_poll_funcs = {
	.job_add = cs_ipcs_job_add,
	.dispatch_add = cs_ipcs_dispatch_add,
	.dispatch_mod = cs_ipcs_dispatch_mod,
	.dispatch_del = cs_ipcs_dispatch_del,
	};

	static int32_t cs_ipcs_connection_accept (qb_ipcs_connection_t *c, uid_t euid, gid_t egid);
	static void cs_ipcs_connection_created(qb_ipcs_connection_t *c);
	static int32_t cs_ipcs_msg_process(qb_ipcs_connection_t *c,
	void *data, size_t size);
	static int32_t cs_ipcs_connection_closed (qb_ipcs_connection_t *c);
	static void cs_ipcs_connection_destroyed (qb_ipcs_connection_t *c);

	static struct qb_ipcs_service_handlers corosync_service_funcs = {
	.connection_accept = cs_ipcs_connection_accept,
	.connection_created = cs_ipcs_connection_created,
	.msg_process = cs_ipcs_msg_process,
	.connection_closed = cs_ipcs_connection_closed,
	.connection_destroyed = cs_ipcs_connection_destroyed,
	};

	static struct ipcs_global_stats global_stats;

	static const char* cs_ipcs_serv_short_name(int32_t service_id)
	{
	const char *name;
	switch (service_id) {
	case CFG_SERVICE:
	name = "cfg";
	break;
	case CPG_SERVICE:
	name = "cpg";
	break;
	case QUORUM_SERVICE:
	name = "quorum";
	break;
	case PLOAD_SERVICE:
	name = "pload";
	break;
	case VOTEQUORUM_SERVICE:
	name = "votequorum";
	break;
	case MON_SERVICE:
	name = "mon";
	break;
	case WD_SERVICE:
	name = "wd";
	break;
	case CMAP_SERVICE:
	name = "cmap";
	break;
	default:
	name = NULL;
	break;
	}
	return name;
	}

	void cs_ipc_allow_connections(int32_t allow)
	{
	ipc_allow_connections = allow;
	}

	int32_t cs_ipcs_service_destroy(int32_t service_id)
	{
	if (ipcs_mapper[service_id].inst) {
	qb_ipcs_destroy(ipcs_mapper[service_id].inst);
	ipcs_mapper[service_id].inst = NULL;
	}
	return 0;
	}

	static int32_t cs_ipcs_connection_accept (qb_ipcs_connection_t *c, uid_t euid, gid_t egid)
	{
	int32_t service = qb_ipcs_service_id_get(c);
	uint8_t u8;
	char key_name[ICMAP_KEYNAME_MAXLEN];

	if (!ipc_allow_connections) {
	log_printf(LOGSYS_LEVEL_DEBUG, "Denied connection, corosync is not ready");
	return -EAGAIN;
	}

	if (corosync_service[service] == NULL \|\|
	ipcs_mapper[service].inst == NULL) {
	return -ENOSYS;
	}

	if (ipc_not_enough_fds_left) {
	return -EMFILE;
	}

	if (euid == 0 \|\| egid == 0) {
	return 0;
	}

	snprintf(key_name, ICMAP_KEYNAME_MAXLEN, "uidgid.uid.%u", euid);
	if (icmap_get_uint8(key_name, &u8) == CS_OK && u8 == 1)
	return 0;

	snprintf(key_name, ICMAP_KEYNAME_MAXLEN, "uidgid.config.uid.%u", euid);
	if (icmap_get_uint8(key_name, &u8) == CS_OK && u8 == 1)
	return 0;

	snprintf(key_name, ICMAP_KEYNAME_MAXLEN, "uidgid.gid.%u", egid);
	if (icmap_get_uint8(key_name, &u8) == CS_OK && u8 == 1)
	return 0;

	snprintf(key_name, ICMAP_KEYNAME_MAXLEN, "uidgid.config.gid.%u", egid);
	if (icmap_get_uint8(key_name, &u8) == CS_OK && u8 == 1)
	return 0;

	log_printf(LOGSYS_LEVEL_ERROR, "Denied connection attempt from %d:%d", euid, egid);

	return -EACCES;
	}

	static char * pid_to_name (pid_t pid, char *out_name, size_t name_len)
	{
	char *name;
	char *rest;
	FILE *fp;
	char fname[32];
	char buf[256];

	snprintf (fname, 32, "/proc/%d/stat", pid);
	fp = fopen (fname, "r");
	if (!fp) {
	return NULL;
	}

	if (fgets (buf, sizeof (buf), fp) == NULL) {
	fclose (fp);
	return NULL;
	}
	fclose (fp);

	name = strrchr (buf, '(');
	if (!name) {
	return NULL;
	}

	/* move past the bracket */
	name++;

	rest = strrchr (buf, ')');

	if (rest == NULL \|\| rest[1] != ' ') {
	return NULL;
	}

	*rest = '\0';
	/* move past the NULL and space */
	rest += 2;

	/* copy the name */
	strncpy (out_name, name, name_len - 1);
	out_name[name_len - 1] = '\0';
	return out_name;
	}

	static void cs_ipcs_connection_created(qb_ipcs_connection_t *c)
	{
	int32_t service = 0;
	struct cs_ipcs_conn_context *context;
	struct qb_ipcs_connection_stats stats;
	size_t size = sizeof(struct cs_ipcs_conn_context);

	log_printf(LOG_DEBUG, "connection created");

	service = qb_ipcs_service_id_get(c);

	size += corosync_service[service]->private_data_size;
	context = calloc(1, size);
	if (context == NULL) {
	qb_ipcs_disconnect(c);
	return;
	}

	qb_list_init(&context->outq_head);
	context->queuing = QB_FALSE;
	context->queued = 0;
	context->sent = 0;

	qb_ipcs_context_set(c, context);

	if (corosync_service[service]->lib_init_fn(c) != 0) {
	log_printf(LOG_ERR, "lib_init_fn failed, disconnecting");
	qb_ipcs_disconnect(c);
	return;
	}

	qb_ipcs_connection_stats_get(c, &stats, QB_FALSE);

	if (!pid_to_name (stats.client_pid, context->proc_name, sizeof(context->proc_name))) {
	context->proc_name[0] = '\0';
	}
	stats_ipcs_add_connection(service, stats.client_pid, c);
	global_stats.active++;
	}

	void cs_ipc_refcnt_inc(void *conn)
	{
	qb_ipcs_connection_ref(conn);
	}

	void cs_ipc_refcnt_dec(void *conn)
	{
	qb_ipcs_connection_unref(conn);
	}

	void cs_ipcs_private_data_get(void conn)
	{
	struct cs_ipcs_conn_context *cnx;
	cnx = qb_ipcs_context_get(conn);
	return &cnx->data[0];
	}

	static void cs_ipcs_connection_destroyed (qb_ipcs_connection_t *c)
	{
	struct cs_ipcs_conn_context *context;
	struct qb_list_head list, tmp_iter;
	struct outq_item *outq_item;

	log_printf(LOG_DEBUG, "%s() ", __func__);

	context = qb_ipcs_context_get(c);
	if (context) {
	qb_list_for_each_safe(list, tmp_iter, &(context->outq_head)) {
	outq_item = qb_list_entry (list, struct outq_item, list);

	qb_list_del (list);
	free (outq_item->msg);
	free (outq_item);
	}
	free(context);
	}
	}

	static int32_t cs_ipcs_connection_closed (qb_ipcs_connection_t *c)
	{
	int32_t res = 0;
	int32_t service = qb_ipcs_service_id_get(c);
	struct qb_ipcs_connection_stats stats;

	log_printf(LOG_DEBUG, "%s() ", __func__);
	res = corosync_service[service]->lib_exit_fn(c);
	if (res != 0) {
	return res;
	}

	qb_loop_job_del(cs_poll_handle_get(), QB_LOOP_HIGH, c, outq_flush);

	qb_ipcs_connection_stats_get(c, &stats, QB_FALSE);

	stats_ipcs_del_connection(service, stats.client_pid, c);

	global_stats.active--;
	global_stats.closed++;
	return 0;
	}

	int cs_ipcs_response_iov_send (void *conn,
	const struct iovec *iov,
	unsigned int iov_len)
	{
	int32_t rc = qb_ipcs_response_sendv(conn, iov, iov_len);
	if (rc >= 0) {
	return 0;
	}
	return rc;
	}

	int cs_ipcs_response_send(void conn, const void msg, size_t mlen)
	{
	int32_t rc = qb_ipcs_response_send(conn, msg, mlen);
	if (rc >= 0) {
	return 0;
	}
	return rc;
	}

	static void outq_flush (void *data)
	{
	qb_ipcs_connection_t *conn = data;
	struct qb_list_head list, tmp_iter;
	struct outq_item *outq_item;
	int32_t rc;
	struct cs_ipcs_conn_context *context = qb_ipcs_context_get(conn);

	qb_list_for_each_safe(list, tmp_iter, &(context->outq_head)) {
	outq_item = qb_list_entry (list, struct outq_item, list);

	rc = qb_ipcs_event_send(conn, outq_item->msg, outq_item->mlen);
	if (rc < 0 && rc != -EAGAIN) {
	errno = -rc;
	qb_perror(LOG_ERR, "qb_ipcs_event_send");
	return;
	} else if (rc == -EAGAIN) {
	break;
	}
	assert(rc == outq_item->mlen);
	context->sent++;
	context->queued--;

	qb_list_del (list);
	free (outq_item->msg);
	free (outq_item);
	}
	if (qb_list_empty (&context->outq_head)) {
	context->queuing = QB_FALSE;
	log_printf(LOGSYS_LEVEL_INFO, "Q empty, queued:%d sent:%d.",
	context->queued, context->sent);
	context->queued = 0;
	context->sent = 0;
	} else {
	qb_loop_job_add(cs_poll_handle_get(), QB_LOOP_HIGH, conn, outq_flush);
	}
	}

	static void msg_send_or_queue(qb_ipcs_connection_t conn, const struct iovec iov, uint32_t iov_len)
	{
	int32_t rc = 0;
	int32_t i;
	int32_t bytes_msg = 0;
	struct outq_item *outq_item;
	char *write_buf = 0;
	struct cs_ipcs_conn_context *context = qb_ipcs_context_get(conn);

	for (i = 0; i < iov_len; i++) {
	bytes_msg += iov[i].iov_len;
	}

	if (!context->queuing) {
	assert(qb_list_empty (&context->outq_head));
	rc = qb_ipcs_event_sendv(conn, iov, iov_len);
	if (rc == bytes_msg) {
	context->sent++;
	return;
	}
	if (rc == -EAGAIN) {
	context->queued = 0;
	context->sent = 0;
	context->queuing = QB_TRUE;
	qb_loop_job_add(cs_poll_handle_get(), QB_LOOP_HIGH, conn, outq_flush);
	} else {
	log_printf(LOGSYS_LEVEL_ERROR, "event_send retuned %d, expected %d!", rc, bytes_msg);
	return;
	}
	}
	outq_item = malloc (sizeof (struct outq_item));
	if (outq_item == NULL) {
	qb_ipcs_disconnect(conn);
	return;
	}
	outq_item->msg = malloc (bytes_msg);
	if (outq_item->msg == NULL) {
	free (outq_item);
	qb_ipcs_disconnect(conn);
	return;
	}

	write_buf = outq_item->msg;
	for (i = 0; i < iov_len; i++) {
	memcpy (write_buf, iov[i].iov_base, iov[i].iov_len);
	write_buf += iov[i].iov_len;
	}
	outq_item->mlen = bytes_msg;
	qb_list_init (&outq_item->list);
	qb_list_add_tail (&outq_item->list, &context->outq_head);
	context->queued++;
	}

	int cs_ipcs_dispatch_send(void conn, const void msg, size_t mlen)
	{
	struct iovec iov;
	iov.iov_base = (void *)msg;
	iov.iov_len = mlen;
	msg_send_or_queue (conn, &iov, 1);
	return 0;
	}

	int cs_ipcs_dispatch_iov_send (void *conn,
	const struct iovec *iov,
	unsigned int iov_len)
	{
	msg_send_or_queue(conn, iov, iov_len);
	return 0;
	}

	static int32_t cs_ipcs_msg_process(qb_ipcs_connection_t *c,
	void *data, size_t size)
	{
	struct qb_ipc_response_header response;
	struct qb_ipc_request_header request_pt = (struct qb_ipc_request_header )data;
	int32_t service = qb_ipcs_service_id_get(c);
	int32_t send_ok = 0;
	int32_t is_async_call = QB_FALSE;
	ssize_t res = -1;
	int sending_allowed_private_data;
	struct cs_ipcs_conn_context *cnx;

	send_ok = corosync_sending_allowed (service,
	request_pt->id,
	request_pt,
	&sending_allowed_private_data);

	is_async_call = (service == CPG_SERVICE && request_pt->id == 2);

	/*
	* This happens when the message contains some kind of invalid
	* parameter, such as an invalid size
	*/
	if (send_ok == -EINVAL) {
	response.size = sizeof (response);
	response.id = 0;
	response.error = CS_ERR_INVALID_PARAM;

	cnx = qb_ipcs_context_get(c);
	if (cnx) {
	cnx->invalid_request++;
	}

	if (is_async_call) {
	log_printf(LOGSYS_LEVEL_INFO, "*** %s() invalid message! size:%d error:%d",
	__func__, response.size, response.error);
	} else {
	qb_ipcs_response_send (c,
	&response,
	sizeof (response));
	}
	res = -EINVAL;
	} else if (send_ok < 0) {
	cnx = qb_ipcs_context_get(c);
	if (cnx) {
	cnx->overload++;
	}
	if (!is_async_call) {
	/*
	* Overload, tell library to retry
	*/
	response.size = sizeof (response);
	response.id = 0;
	response.error = CS_ERR_TRY_AGAIN;
	qb_ipcs_response_send (c,
	&response,
	sizeof (response));
	} else {
	log_printf(LOGSYS_LEVEL_WARNING,
	"*** %s() (%d:%d - %d) %s!",
	__func__, service, request_pt->id,
	is_async_call, strerror(-send_ok));
	}
	res = -ENOBUFS;
	}

	if (send_ok >= 0) {
	corosync_service[service]->lib_engine[request_pt->id].lib_handler_fn(c, request_pt);
	res = 0;
	}
	corosync_sending_allowed_release (&sending_allowed_private_data);
	return res;
	}


	static int32_t cs_ipcs_job_add(enum qb_loop_priority p, void *data, qb_loop_job_dispatch_fn fn)
	{
	return qb_loop_job_add(cs_poll_handle_get(), p, data, fn);
	}

	static int32_t cs_ipcs_dispatch_add(enum qb_loop_priority p, int32_t fd, int32_t events,
	void *data, qb_ipcs_dispatch_fn_t fn)
	{
	return qb_loop_poll_add(cs_poll_handle_get(), p, fd, events, data, fn);
	}

	static int32_t cs_ipcs_dispatch_mod(enum qb_loop_priority p, int32_t fd, int32_t events,
	void *data, qb_ipcs_dispatch_fn_t fn)
	{
	return qb_loop_poll_mod(cs_poll_handle_get(), p, fd, events, data, fn);
	}

	static int32_t cs_ipcs_dispatch_del(int32_t fd)
	{
	return qb_loop_poll_del(cs_poll_handle_get(), fd);
	}

	static void cs_ipcs_low_fds_event(int32_t not_enough, int32_t fds_available)
	{
	ipc_not_enough_fds_left = not_enough;
	if (not_enough) {
	log_printf(LOGSYS_LEVEL_WARNING, "refusing new connections (fds_available:%d)",
	fds_available);
	} else {
	log_printf(LOGSYS_LEVEL_NOTICE, "allowing new connections (fds_available:%d)",
	fds_available);

	}
	}

	int32_t cs_ipcs_q_level_get(void)
	{
	return ipc_fc_totem_queue_level;
	}

	static qb_loop_timer_handle ipcs_check_for_flow_control_timer;
	static void cs_ipcs_check_for_flow_control(void)
	{
	int32_t i;
	int32_t fc_enabled;

	for (i = 0; i < SERVICES_COUNT_MAX; i++) {
	if (corosync_service[i] == NULL \|\| ipcs_mapper[i].inst == NULL) {
	continue;
	}
	fc_enabled = QB_IPCS_RATE_OFF;
	if (ipc_fc_is_quorate == 1 \|\|
	corosync_service[i]->allow_inquorate == CS_LIB_ALLOW_INQUORATE) {
	/*
	* we are quorate
	* now check flow control
	*/
	if (ipc_fc_totem_queue_level != TOTEM_Q_LEVEL_CRITICAL &&
	ipc_fc_sync_in_process == 0) {
	fc_enabled = QB_FALSE;
	} else if (ipc_fc_totem_queue_level != TOTEM_Q_LEVEL_CRITICAL &&
	i == VOTEQUORUM_SERVICE) {
	/*
	* Allow message processing for votequorum service even
	* in sync phase
	*/
	fc_enabled = QB_FALSE;
	} else {
	fc_enabled = QB_IPCS_RATE_OFF_2;
	}
	}
	if (fc_enabled) {
	qb_ipcs_request_rate_limit(ipcs_mapper[i].inst, fc_enabled);

	qb_loop_timer_add(cs_poll_handle_get(), QB_LOOP_MED, 1*QB_TIME_NS_IN_MSEC,
	NULL, corosync_recheck_the_q_level, &ipcs_check_for_flow_control_timer);
	} else if (ipc_fc_totem_queue_level == TOTEM_Q_LEVEL_LOW) {
	qb_ipcs_request_rate_limit(ipcs_mapper[i].inst, QB_IPCS_RATE_FAST);
	} else if (ipc_fc_totem_queue_level == TOTEM_Q_LEVEL_GOOD) {
	qb_ipcs_request_rate_limit(ipcs_mapper[i].inst, QB_IPCS_RATE_NORMAL);
	} else if (ipc_fc_totem_queue_level == TOTEM_Q_LEVEL_HIGH) {
	qb_ipcs_request_rate_limit(ipcs_mapper[i].inst, QB_IPCS_RATE_SLOW);
	}
	}
	}

	static void cs_ipcs_fc_quorum_changed(int quorate, void *context)
	{
	ipc_fc_is_quorate = quorate;
	cs_ipcs_check_for_flow_control();
	}

	static void cs_ipcs_totem_queue_level_changed(enum totem_q_level level)
	{
	ipc_fc_totem_queue_level = level;
	cs_ipcs_check_for_flow_control();
	}

	void cs_ipcs_sync_state_changed(int32_t sync_in_process)
	{
	ipc_fc_sync_in_process = sync_in_process;
	cs_ipcs_check_for_flow_control();
	}

	void cs_ipcs_get_global_stats(struct ipcs_global_stats *ipcs_stats)
	{
	memcpy(ipcs_stats, &global_stats, sizeof(global_stats));
	}

	cs_error_t cs_ipcs_get_conn_stats(int service_id, uint32_t pid, void conn_ptr, struct ipcs_conn_stats ipcs_stats)
	{
	struct cs_ipcs_conn_context *cnx;
	qb_ipcs_connection_t c, prev;
	int found = 0;

	if (corosync_service[service_id] == NULL \|\| ipcs_mapper[service_id].inst == NULL) {
	return CS_ERR_NOT_EXIST;
	}

	qb_ipcs_stats_get(ipcs_mapper[service_id].inst, &ipcs_stats->srv, QB_FALSE);

	for (c = qb_ipcs_connection_first_get(ipcs_mapper[service_id].inst);
	c;
	prev = c, c = qb_ipcs_connection_next_get(ipcs_mapper[service_id].inst, prev), qb_ipcs_connection_unref(prev)) {

	cnx = qb_ipcs_context_get(c);
	if (cnx == NULL) continue;
	if (c != conn_ptr) continue;

	qb_ipcs_connection_stats_get(c, &ipcs_stats->conn, QB_FALSE);
	if (ipcs_stats->conn.client_pid != pid) {
	continue;
	}
	found = 1;
	memcpy(&ipcs_stats->cnx, cnx, sizeof(struct cs_ipcs_conn_context));
	}
	if (!found) {
	return CS_ERR_NOT_EXIST;
	}

	return CS_OK;
	}

	void cs_ipcs_clear_stats()
	{
	struct cs_ipcs_conn_context *cnx;
	struct ipcs_conn_stats ipcs_stats;
	qb_ipcs_connection_t c, prev;
	int service_id;

	/* Global stats are easy */
	memset(&global_stats, 0, sizeof(global_stats));

	for (service_id = 0; service_id < SERVICES_COUNT_MAX; service_id++) {
	if (!ipcs_mapper[service_id].inst) {
	continue;
	}

	for (c = qb_ipcs_connection_first_get(ipcs_mapper[service_id].inst);
	c;
	prev = c, c = qb_ipcs_connection_next_get(ipcs_mapper[service_id].inst, prev), qb_ipcs_connection_unref(prev)) {
	/* Get stats with 'clear_after_read' set */
	qb_ipcs_connection_stats_get(c, &ipcs_stats.conn, QB_TRUE);

	/* Our own stats */
	cnx = qb_ipcs_context_get(c);
	if (cnx == NULL) continue;
	cnx->invalid_request = 0;
	cnx->overload = 0;
	cnx->sent = 0;

	}
	}
	}

	static enum qb_ipc_type cs_get_ipc_type (void)
	{
	char *str;
	int found = 0;
	enum qb_ipc_type ret = QB_IPC_NATIVE;

	if (icmap_get_string("system.qb_ipc_type", &str) != CS_OK) {
	log_printf(LOGSYS_LEVEL_DEBUG, "No configured system.qb_ipc_type. Using native ipc");
	return QB_IPC_NATIVE;
	}

	if (strcmp(str, "native") == 0) {
	ret = QB_IPC_NATIVE;
	found = 1;
	}

	if (strcmp(str, "shm") == 0) {
	ret = QB_IPC_SHM;
	found = 1;
	}

	if (strcmp(str, "socket") == 0) {
	ret = QB_IPC_SOCKET;
	found = 1;
	}

	if (found) {
	log_printf(LOGSYS_LEVEL_DEBUG, "Using %s ipc", str);
	} else {
	log_printf(LOGSYS_LEVEL_DEBUG, "Unknown ipc type %s", str);
	}

	free(str);

	return ret;
	}

	const char cs_ipcs_service_init(struct corosync_service_engine service)
	{
	const char *serv_short_name;

	serv_short_name = cs_ipcs_serv_short_name(service->id);

	if (service->lib_engine_count == 0) {
	log_printf (LOGSYS_LEVEL_DEBUG,
	"NOT Initializing IPC on %s [%d]",
	serv_short_name,
	service->id);
	return NULL;
	}

	if (strlen(serv_short_name) >= CS_IPCS_MAPPER_SERV_NAME) {
	log_printf (LOGSYS_LEVEL_ERROR, "service name %s is too long", serv_short_name);
	return "qb_ipcs_run error";
	}

	ipcs_mapper[service->id].id = service->id;
	strcpy(ipcs_mapper[service->id].name, serv_short_name);
	log_printf (LOGSYS_LEVEL_DEBUG,
	"Initializing IPC on %s [%d]",
	ipcs_mapper[service->id].name,
	ipcs_mapper[service->id].id);
	ipcs_mapper[service->id].inst = qb_ipcs_create(ipcs_mapper[service->id].name,
	ipcs_mapper[service->id].id,
	cs_get_ipc_type(),
	&corosync_service_funcs);
	assert(ipcs_mapper[service->id].inst);
	qb_ipcs_poll_handlers_set(ipcs_mapper[service->id].inst,
	&corosync_poll_funcs);
	if (qb_ipcs_run(ipcs_mapper[service->id].inst) != 0) {
	log_printf (LOGSYS_LEVEL_ERROR, "Can't initialize IPC");
	return "qb_ipcs_run error";
	}

	return NULL;
	}

	void cs_ipcs_init(void)
	{
	api = apidef_get ();

	qb_loop_poll_low_fds_event_set(cs_poll_handle_get(), cs_ipcs_low_fds_event);

	api->quorum_register_callback (cs_ipcs_fc_quorum_changed, NULL);
	totempg_queue_level_register_callback (cs_ipcs_totem_queue_level_changed);

	global_stats.active = 0;
	global_stats.closed = 0;
	}

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