corosync/exec/totemconfig.c

/*
 * Copyright (c) 2002-2005 MontaVista Software, Inc.
 * Copyright (c) 2006-2011 Red Hat, Inc.
 *
 * All rights reserved.
 *
 * Author: Steven Dake (sdake@redhat.com)
 *         Jan Friesse (jfriesse@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 the MontaVista Software, 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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/param.h>

#include <corosync/swab.h>
#include <corosync/list.h>
#include <qb/qbdefs.h>
#include <corosync/totem/totem.h>
#include <corosync/config.h>
#include <corosync/logsys.h>
#include <corosync/engine/icmap.h>

#ifdef HAVE_LIBNSS
#include <nss.h>
#include <pk11pub.h>
#include <pkcs11.h>
#include <prerror.h>
#endif

#include "util.h"
#include "totemconfig.h"

#define TOKEN_RETRANSMITS_BEFORE_LOSS_CONST	4
#define TOKEN_TIMEOUT				1000
#define TOKEN_RETRANSMIT_TIMEOUT		(int)(TOKEN_TIMEOUT / (TOKEN_RETRANSMITS_BEFORE_LOSS_CONST + 0.2))
#define TOKEN_HOLD_TIMEOUT			(int)(TOKEN_RETRANSMIT_TIMEOUT * 0.8 - (1000/(int)HZ))
#define JOIN_TIMEOUT				50
#define MERGE_TIMEOUT				200
#define DOWNCHECK_TIMEOUT			1000
#define FAIL_TO_RECV_CONST			2500
#define	SEQNO_UNCHANGED_CONST			30
#define MINIMUM_TIMEOUT				(int)(1000/HZ)*3
#define MAX_NETWORK_DELAY			50
#define WINDOW_SIZE				50
#define MAX_MESSAGES				17
#define MISS_COUNT_CONST			5
#define RRP_PROBLEM_COUNT_TIMEOUT		2000
#define RRP_PROBLEM_COUNT_THRESHOLD_DEFAULT	10
#define RRP_PROBLEM_COUNT_THRESHOLD_MIN		2
#define RRP_AUTORECOVERY_CHECK_TIMEOUT		1000

static char error_string_response[512];

static void add_totem_config_notification(struct totem_config *totem_config);

static void totem_volatile_config_read (struct totem_config *totem_config)
{
	char *str;

	icmap_get_uint32("totem.token", &totem_config->token_timeout);
	icmap_get_uint32("totem.token_retransmit", &totem_config->token_retransmit_timeout);
	icmap_get_uint32("totem.hold", &totem_config->token_hold_timeout);
	icmap_get_uint32("totem.token_retransmits_before_loss_const", &totem_config->token_retransmits_before_loss_const);
	icmap_get_uint32("totem.join", &totem_config->join_timeout);
	icmap_get_uint32("totem.send_join", &totem_config->send_join_timeout);
	icmap_get_uint32("totem.consensus", &totem_config->consensus_timeout);
	icmap_get_uint32("totem.merge", &totem_config->merge_timeout);
	icmap_get_uint32("totem.downcheck", &totem_config->downcheck_timeout);
	icmap_get_uint32("totem.fail_recv_const", &totem_config->fail_to_recv_const);
	icmap_get_uint32("totem.seqno_unchanged_const", &totem_config->seqno_unchanged_const);
	icmap_get_uint32("totem.rrp_token_expired_timeout", &totem_config->rrp_token_expired_timeout);
	icmap_get_uint32("totem.rrp_problem_count_timeout", &totem_config->rrp_problem_count_timeout);
	icmap_get_uint32("totem.rrp_problem_count_threshold", &totem_config->rrp_problem_count_threshold);
	icmap_get_uint32("totem.rrp_problem_count_mcast_threshold", &totem_config->rrp_problem_count_mcast_threshold);
	icmap_get_uint32("totem.rrp_autorecovery_check_timeout", &totem_config->rrp_autorecovery_check_timeout);
	icmap_get_uint32("totem.heartbeat_failures_allowed", &totem_config->heartbeat_failures_allowed);
	icmap_get_uint32("totem.max_network_delay", &totem_config->max_network_delay);
	icmap_get_uint32("totem.window_size", &totem_config->window_size);
	icmap_get_uint32("totem.max_messages", &totem_config->max_messages);
	icmap_get_uint32("totem.miss_count_const", &totem_config->miss_count_const);
	if (icmap_get_string("totem.vsftype", &str) == CS_OK) {
		totem_config->vsf_type = str;
	}
}


static void totem_get_crypto_type(struct totem_config *totem_config)
{
	char *str;

	totem_config->crypto_accept = TOTEM_CRYPTO_ACCEPT_OLD;
	if (icmap_get_string("totem.crypto_accept", &str) == CS_OK) {
		if (strcmp(str, "new") == 0) {
			totem_config->crypto_accept = TOTEM_CRYPTO_ACCEPT_NEW;
		}
		free(str);
	}

	totem_config->crypto_type = TOTEM_CRYPTO_SOBER;

#ifdef HAVE_LIBNSS
	/*
	 * We must set these even if the key does not exist.
	 * Encryption type can be set on-the-fly using CFG
	 */
	totem_config->crypto_crypt_type = CKM_AES_CBC_PAD;
	totem_config->crypto_sign_type = CKM_SHA256_RSA_PKCS;
#endif

	if (icmap_get_string("totem.crypto_type", &str) == CS_OK) {
		if (strcmp(str, "sober") == 0) {
			free(str);
			return;
		}
#ifdef HAVE_LIBNSS
		if (strcmp(str, "nss") == 0) {
			totem_config->crypto_type = TOTEM_CRYPTO_NSS;
		}
		free(str);
#endif
	}
}

extern int totem_config_read (
	struct totem_config *totem_config,
	const char **error_string)
{
	int res = 0;
	char *str;
	unsigned int ringnumber = 0;
	int member_count = 0;
	icmap_iter_t iter, member_iter;
	const char *iter_key;
	const char *member_iter_key;
	char ringnumber_key[ICMAP_KEYNAME_MAXLEN];
	char tmp_key[ICMAP_KEYNAME_MAXLEN];
	uint8_t u8;

	memset (totem_config, 0, sizeof (struct totem_config));
	totem_config->interfaces = malloc (sizeof (struct totem_interface) * INTERFACE_MAX);
	if (totem_config->interfaces == 0) {
		*error_string = "Out of memory trying to allocate ethernet interface storage area";
		return -1;
	}

	memset (totem_config->interfaces, 0,
		sizeof (struct totem_interface) * INTERFACE_MAX);

	totem_config->secauth = 1;

	strcpy (totem_config->rrp_mode, "none");

	icmap_get_uint32("totem.version", (uint32_t *)&totem_config->version);

	if (icmap_get_string("totem.secauth", &str) == CS_OK) {
		if (strcmp (str, "on") == 0) {
			totem_config->secauth = 1;
		}
		if (strcmp (str, "off") == 0) {
			totem_config->secauth = 0;
		}
		free(str);
	}

	if (totem_config->secauth == 1) {
		totem_get_crypto_type(totem_config);
	}

	if (icmap_get_string("totem.rrp_mode", &str) == CS_OK) {
		strcpy (totem_config->rrp_mode, str);
		free(str);
	}

	/*
	 * Get interface node id
	 */
	icmap_get_uint32("totem.nodeid", &totem_config->node_id);

	totem_config->clear_node_high_bit = 0;
	if (icmap_get_string("totem.clear_node_high_bit", &str) == CS_OK) {
		if (strcmp (str, "yes") == 0) {
			totem_config->clear_node_high_bit = 1;
		}
		free(str);
	}

	icmap_get_uint32("totem.threads", &totem_config->threads);

	icmap_get_uint32("totem.netmtu", &totem_config->net_mtu);

	/*
	 * Get things that might change in the future
	 */
	totem_volatile_config_read(totem_config);

	iter = icmap_iter_init("totem.interface.");
	while ((iter_key = icmap_iter_next(iter, NULL, NULL)) != NULL) {
		res = sscanf(iter_key, "totem.interface.%[^.].%s", ringnumber_key, tmp_key);
		if (res != 2) {
			continue;
		}

		if (strcmp(tmp_key, "bindnetaddr") != 0) {
			continue;
		}

		member_count = 0;

		ringnumber = atoi(ringnumber_key);

		/*
		 * Get the bind net address
		 */
		if (icmap_get_string(iter_key, &str) == CS_OK) {
			res = totemip_parse (&totem_config->interfaces[ringnumber].bindnet, str,
						     totem_config->interfaces[ringnumber].mcast_addr.family);
			free(str);
		}

		/*
		 * Get interface multicast address
		 */
		snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.mcastaddr", ringnumber);
		if (icmap_get_string(tmp_key, &str) == CS_OK) {
			res = totemip_parse (&totem_config->interfaces[ringnumber].mcast_addr, str, 0);
			free(str);
		}

		totem_config->broadcast_use = 0;
		snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.broadcast", ringnumber);
		if (icmap_get_string(tmp_key, &str) == CS_OK) {
			if (strcmp (str, "yes") == 0) {
				totem_config->broadcast_use = 1;
				totemip_parse (
					&totem_config->interfaces[ringnumber].mcast_addr,
					"255.255.255.255", 0);
			}
			free(str);
		}

		/*
		 * Get mcast port
		 */
		snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.mcastport", ringnumber);
		icmap_get_uint16(tmp_key, &totem_config->interfaces[ringnumber].ip_port);

		/*
		 * Get the TTL
		 */
		totem_config->interfaces[ringnumber].ttl = 1;

		snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.ttl", ringnumber);

		if (icmap_get_uint8(tmp_key, &u8) == CS_OK) {
			totem_config->interfaces[ringnumber].ttl = u8;
		}

		snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.member.", ringnumber);
		member_iter = icmap_iter_init(tmp_key);
		while ((member_iter_key = icmap_iter_next(member_iter, NULL, NULL)) != NULL) {
			if (icmap_get_string(member_iter_key, &str) == CS_OK) {
				res = totemip_parse (&totem_config->interfaces[ringnumber].member_list[member_count++],
						str, 0);
			}
		}
		icmap_iter_finalize(member_iter);

		totem_config->interfaces[ringnumber].member_count = member_count;
		totem_config->interface_count++;
	}
	icmap_iter_finalize(iter);

	totem_config->transport_number = TOTEM_TRANSPORT_UDP;
	if (icmap_get_string("totem.transport", &str) == CS_OK) {
		if (strcmp (str, "udpu") == 0) {
			totem_config->transport_number = TOTEM_TRANSPORT_UDPU;
		}

		if (strcmp (str, "iba") == 0) {
			totem_config->transport_number = TOTEM_TRANSPORT_RDMA;
		}
		free(str);
	}

	add_totem_config_notification(totem_config);

	return 0;
}

int totem_config_validate (
	struct totem_config *totem_config,
	const char **error_string)
{
	static char local_error_reason[512];
	char parse_error[512];
	const char *error_reason = local_error_reason;
	int i;
	unsigned int interface_max = INTERFACE_MAX;

	if (totem_config->interface_count == 0) {
		error_reason = "No interfaces defined";
		goto parse_error;
	}

	for (i = 0; i < totem_config->interface_count; i++) {
		/*
		 * Some error checking of parsed data to make sure its valid
		 */

		struct totem_ip_address null_addr;
		memset (&null_addr, 0, sizeof (struct totem_ip_address));

		if ((totem_config->transport_number == 0) &&
			memcmp (&totem_config->interfaces[i].mcast_addr, &null_addr,
				sizeof (struct totem_ip_address)) == 0) {
			error_reason = "No multicast address specified";
			goto parse_error;
		}

		if (totem_config->interfaces[i].ip_port == 0) {
			error_reason = "No multicast port specified";
			goto parse_error;
		}

		if (totem_config->interfaces[i].ttl > 255) {
			error_reason = "Invalid TTL (should be 0..255)";
			goto parse_error;
		}
		if (totem_config->transport_number != TOTEM_TRANSPORT_UDP &&
		    totem_config->interfaces[i].ttl != 1) {
			error_reason = "Can only set ttl on multicast transport types";
			goto parse_error;
		}

		if (totem_config->interfaces[i].mcast_addr.family == AF_INET6 &&
			totem_config->node_id == 0) {

			error_reason = "An IPV6 network requires that a node ID be specified.";
			goto parse_error;
		}

		if (totem_config->broadcast_use == 0 && totem_config->transport_number == 0) {
			if (totem_config->interfaces[i].mcast_addr.family != totem_config->interfaces[i].bindnet.family) {
				error_reason = "Multicast address family does not match bind address family";
				goto parse_error;
			}

			if (totem_config->interfaces[i].mcast_addr.family != totem_config->interfaces[i].bindnet.family) {
				error_reason =  "Not all bind address belong to the same IP family";
				goto parse_error;
			}
			if (totemip_is_mcast (&totem_config->interfaces[i].mcast_addr) != 0) {
				error_reason = "mcastaddr is not a correct multicast address.";
				goto parse_error;
			}
		}
	}

	if (totem_config->version != 2) {
		error_reason = "This totem parser can only parse version 2 configurations.";
		goto parse_error;
	}


	if (totem_config->token_retransmits_before_loss_const == 0) {
		totem_config->token_retransmits_before_loss_const =
			TOKEN_RETRANSMITS_BEFORE_LOSS_CONST;
	}

	/*
	 * Setup timeout values that are not setup by user
	 */
	if (totem_config->token_timeout == 0) {
		totem_config->token_timeout = TOKEN_TIMEOUT;
		if (totem_config->token_retransmits_before_loss_const == 0) {
			totem_config->token_retransmits_before_loss_const = TOKEN_RETRANSMITS_BEFORE_LOSS_CONST;
		}

		if (totem_config->token_retransmit_timeout == 0) {
			totem_config->token_retransmit_timeout =
				(int)(totem_config->token_timeout /
				(totem_config->token_retransmits_before_loss_const + 0.2));
		}
		if (totem_config->token_hold_timeout == 0) {
			totem_config->token_hold_timeout =
				(int)(totem_config->token_retransmit_timeout * 0.8 -
				(1000/HZ));
		}
	}

	if (totem_config->max_network_delay == 0) {
		totem_config->max_network_delay = MAX_NETWORK_DELAY;
	}

	if (totem_config->max_network_delay < MINIMUM_TIMEOUT) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The max_network_delay parameter (%d ms) may not be less then (%d ms).",
			totem_config->max_network_delay, MINIMUM_TIMEOUT);
		goto parse_error;
	}

	if (totem_config->window_size == 0) {
		totem_config->window_size = WINDOW_SIZE;
	}

	if (totem_config->max_messages == 0) {
		totem_config->max_messages = MAX_MESSAGES;
	}

	if (totem_config->miss_count_const == 0) {
		totem_config->miss_count_const = MISS_COUNT_CONST;
	}

	if (totem_config->token_timeout < MINIMUM_TIMEOUT) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The token timeout parameter (%d ms) may not be less then (%d ms).",
			totem_config->token_timeout, MINIMUM_TIMEOUT);
		goto parse_error;
	}

	if (totem_config->token_retransmit_timeout == 0) {
		totem_config->token_retransmit_timeout =
			(int)(totem_config->token_timeout /
			(totem_config->token_retransmits_before_loss_const + 0.2));
	}
	if (totem_config->token_hold_timeout == 0) {
		totem_config->token_hold_timeout =
			(int)(totem_config->token_retransmit_timeout * 0.8 -
			(1000/HZ));
	}
	if (totem_config->token_retransmit_timeout < MINIMUM_TIMEOUT) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The token retransmit timeout parameter (%d ms) may not be less then (%d ms).",
			totem_config->token_retransmit_timeout, MINIMUM_TIMEOUT);
		goto parse_error;
	}

	if (totem_config->token_hold_timeout == 0) {
		totem_config->token_hold_timeout = TOKEN_HOLD_TIMEOUT;
	}

	if (totem_config->token_hold_timeout < MINIMUM_TIMEOUT) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The token hold timeout parameter (%d ms) may not be less then (%d ms).",
			totem_config->token_hold_timeout, MINIMUM_TIMEOUT);
		goto parse_error;
	}

	if (totem_config->join_timeout == 0) {
		totem_config->join_timeout = JOIN_TIMEOUT;
	}

	if (totem_config->join_timeout < MINIMUM_TIMEOUT) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The join timeout parameter (%d ms) may not be less then (%d ms).",
			totem_config->join_timeout, MINIMUM_TIMEOUT);
		goto parse_error;
	}

	if (totem_config->consensus_timeout == 0) {
		totem_config->consensus_timeout = (int)(float)(1.2 * totem_config->token_timeout);
	}

	if (totem_config->consensus_timeout < MINIMUM_TIMEOUT) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The consensus timeout parameter (%d ms) may not be less then (%d ms).",
			totem_config->consensus_timeout, MINIMUM_TIMEOUT);
		goto parse_error;
	}

	if (totem_config->merge_timeout == 0) {
		totem_config->merge_timeout = MERGE_TIMEOUT;
	}

	if (totem_config->merge_timeout < MINIMUM_TIMEOUT) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The merge timeout parameter (%d ms) may not be less then (%d ms).",
			totem_config->merge_timeout, MINIMUM_TIMEOUT);
		goto parse_error;
	}

	if (totem_config->downcheck_timeout == 0) {
		totem_config->downcheck_timeout = DOWNCHECK_TIMEOUT;
	}

	if (totem_config->downcheck_timeout < MINIMUM_TIMEOUT) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The downcheck timeout parameter (%d ms) may not be less then (%d ms).",
			totem_config->downcheck_timeout, MINIMUM_TIMEOUT);
		goto parse_error;
	}

	/*
	 * RRP values validation
	 */
	if (strcmp (totem_config->rrp_mode, "none") &&
		strcmp (totem_config->rrp_mode, "active") &&
		strcmp (totem_config->rrp_mode, "passive")) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The RRP mode \"%s\" specified is invalid.  It must be none, active, or passive.\n", totem_config->rrp_mode);
		goto parse_error;
	}
	if (totem_config->rrp_problem_count_timeout == 0) {
		totem_config->rrp_problem_count_timeout = RRP_PROBLEM_COUNT_TIMEOUT;
	}
	if (totem_config->rrp_problem_count_timeout < MINIMUM_TIMEOUT) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The RRP problem count timeout parameter (%d ms) may not be less then (%d ms).",
			totem_config->rrp_problem_count_timeout, MINIMUM_TIMEOUT);
		goto parse_error;
	}
	if (totem_config->rrp_problem_count_threshold == 0) {
		totem_config->rrp_problem_count_threshold = RRP_PROBLEM_COUNT_THRESHOLD_DEFAULT;
	}
	if (totem_config->rrp_problem_count_mcast_threshold == 0) {
		totem_config->rrp_problem_count_mcast_threshold = totem_config->rrp_problem_count_threshold * 10;
	}
	if (totem_config->rrp_problem_count_threshold < RRP_PROBLEM_COUNT_THRESHOLD_MIN) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The RRP problem count threshold (%d problem count) may not be less then (%d problem count).",
			totem_config->rrp_problem_count_threshold, RRP_PROBLEM_COUNT_THRESHOLD_MIN);
		goto parse_error;
	}
	if (totem_config->rrp_problem_count_mcast_threshold < RRP_PROBLEM_COUNT_THRESHOLD_MIN) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The RRP multicast problem count threshold (%d problem count) may not be less then (%d problem count).",
			totem_config->rrp_problem_count_mcast_threshold, RRP_PROBLEM_COUNT_THRESHOLD_MIN);
		goto parse_error;
	}
	if (totem_config->rrp_token_expired_timeout == 0) {
		totem_config->rrp_token_expired_timeout =
			totem_config->token_retransmit_timeout;
	}

	if (totem_config->rrp_token_expired_timeout < MINIMUM_TIMEOUT) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The RRP token expired timeout parameter (%d ms) may not be less then (%d ms).",
			totem_config->rrp_token_expired_timeout, MINIMUM_TIMEOUT);
		goto parse_error;
	}

	if (totem_config->rrp_autorecovery_check_timeout == 0) {
		totem_config->rrp_autorecovery_check_timeout = RRP_AUTORECOVERY_CHECK_TIMEOUT;
	}

	if (strcmp (totem_config->rrp_mode, "none") == 0) {
		interface_max = 1;
	}
	if (interface_max < totem_config->interface_count) {
		snprintf (parse_error, sizeof(parse_error),
			"%d is too many configured interfaces for the rrp_mode setting %s.",
			totem_config->interface_count,
			totem_config->rrp_mode);
		error_reason = parse_error;
		goto parse_error;
	}


	if (totem_config->fail_to_recv_const == 0) {
		totem_config->fail_to_recv_const = FAIL_TO_RECV_CONST;
	}
	if (totem_config->seqno_unchanged_const == 0) {
		totem_config->seqno_unchanged_const = SEQNO_UNCHANGED_CONST;
	}
	if (totem_config->net_mtu == 0) {
		totem_config->net_mtu = 1500;
	}

	if ((MESSAGE_QUEUE_MAX) < totem_config->max_messages) {
		snprintf (local_error_reason, sizeof(local_error_reason),
			"The max_messages parameter (%d messages) may not be greater then (%d messages).",
			totem_config->max_messages, MESSAGE_QUEUE_MAX);
		goto parse_error;
	}

	if (totem_config->threads > SEND_THREADS_MAX) {
		totem_config->threads = SEND_THREADS_MAX;
	}
	if (totem_config->secauth == 0) {
		totem_config->threads = 0;
	}
	if (totem_config->net_mtu > FRAME_SIZE_MAX) {
		error_reason = "This net_mtu parameter is greater then the maximum frame size";
		goto parse_error;
	}
	if (totem_config->vsf_type == NULL) {
		totem_config->vsf_type = "none";
	}

	return (0);

parse_error:
	snprintf (error_string_response, sizeof(error_string_response),
		 "parse error in config: %s\n", error_reason);
	*error_string = error_string_response;
	return (-1);
}

static int read_keyfile (
	const char *key_location,
	struct totem_config *totem_config,
	const char **error_string)
{
	int fd;
	int res;
	ssize_t expected_key_len = sizeof (totem_config->private_key);
	int saved_errno;
	char error_str[100];
	const char *error_ptr;

	fd = open (key_location, O_RDONLY);
	if (fd == -1) {
		error_ptr = qb_strerror_r(errno, error_str, sizeof(error_str));
		snprintf (error_string_response, sizeof(error_string_response),
			"Could not open %s: %s\n",
			 key_location, error_ptr);
		goto parse_error;
	}

	res = read (fd, totem_config->private_key, expected_key_len);
	saved_errno = errno;
	close (fd);

	if (res == -1) {
		error_ptr = qb_strerror_r (saved_errno, error_str, sizeof(error_str));
		snprintf (error_string_response, sizeof(error_string_response),
			"Could not read %s: %s\n",
			 key_location, error_ptr);
		goto parse_error;
	}

	totem_config->private_key_len = expected_key_len;

	if (res != expected_key_len) {
		snprintf (error_string_response, sizeof(error_string_response),
			"Could only read %d bits of 1024 bits from %s.\n",
			 res * 8, key_location);
		goto parse_error;
	}

	return 0;

parse_error:
	*error_string = error_string_response;
	return (-1);
}

int totem_config_keyread (
	struct totem_config *totem_config,
	const char **error_string)
{
	int got_key = 0;
	char *key_location = NULL;
	int res;
	size_t key_len;

	memset (totem_config->private_key, 0, 128);
	totem_config->private_key_len = 128;

	if (totem_config->secauth == 0) {
		return (0);
	}

	/* cmap may store the location of the key file */
	if (icmap_get_string("totem.keyfile", &key_location) == CS_OK) {
		res = read_keyfile(key_location, totem_config, error_string);
		free(key_location);
		if (res)  {
			goto key_error;
		}
		got_key = 1;
	} else { /* Or the key itself may be in the cmap */
		if (icmap_get("totem.key", NULL, &key_len, NULL) == CS_OK) {
			if (key_len > sizeof (totem_config->private_key)) {
				sprintf(error_string_response, "key is too long");
				goto key_error;
			}
			if (icmap_get("totem.key", totem_config->private_key, &key_len, NULL) == CS_OK) {
				totem_config->private_key_len = key_len;
				got_key = 1;
			} else {
				sprintf(error_string_response, "can't store private key");
				goto key_error;
			}
		}
	}

	/* In desperation we read the default filename */
	if (!got_key) {
		const char *filename = getenv("COROSYNC_TOTEM_AUTHKEY_FILE");
		if (!filename)
			filename = COROSYSCONFDIR "/authkey";
		res = read_keyfile(filename, totem_config, error_string);
		if (res)
			goto key_error;

	}

	return (0);

key_error:
	*error_string = error_string_response;
	return (-1);

}

static void totem_change_notify(
	int32_t event,
	const char *key_name,
	struct icmap_notify_value new_val,
	struct icmap_notify_value old_val,
	void *user_data)
{
	totem_volatile_config_read((struct totem_config *)user_data);
}

static void add_totem_config_notification(struct totem_config *totem_config)
{
	icmap_track_t icmap_track;

	icmap_track_add("totem.",
		ICMAP_TRACK_ADD | ICMAP_TRACK_DELETE | ICMAP_TRACK_MODIFY | ICMAP_TRACK_PREFIX,
		totem_change_notify,
		totem_config,
		&icmap_track);
}