config: Allow use of ring0_addr

[mirror_corosync.git] / exec / totemconfig.c

/*
 * Copyright (c) 2002-2005 MontaVista Software, Inc.
 * Copyright (c) 2006-2018 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 <ifaddrs.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/param.h>
#include <sys/utsname.h>

#include <corosync/swab.h>
#include <qb/qblist.h>
#include <qb/qbdefs.h>
#include <libknet.h>
#include <corosync/totem/totem.h>
#include <corosync/config.h>
#include <corosync/logsys.h>
#include <corosync/icmap.h>

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

#define TOKEN_RETRANSMITS_BEFORE_LOSS_CONST     4
#define TOKEN_TIMEOUT                           1000
#define TOKEN_COEFFICIENT                       650
#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

/* These currently match the defaults in libknet.h */
#define KNET_PING_INTERVAL                      1000
#define KNET_PING_TIMEOUT                       2000
#define KNET_PING_PRECISION                     2048
#define KNET_PONG_COUNT                         2
#define KNET_PMTUD_INTERVAL                     30
#define KNET_DEFAULT_TRANSPORT                  KNET_TRANSPORT_UDP

#define DEFAULT_PORT                            5405

static char error_string_response[512];

static void add_totem_config_notification(struct totem_config *totem_config);

static void *totem_get_param_by_name(struct totem_config *totem_config, const char *param_name)
{
        if (strcmp(param_name, "totem.token") == 0)
                return &totem_config->token_timeout;
        if (strcmp(param_name, "totem.token_retransmit") == 0)
                return &totem_config->token_retransmit_timeout;
        if (strcmp(param_name, "totem.hold") == 0)
                return &totem_config->token_hold_timeout;
        if (strcmp(param_name, "totem.token_retransmits_before_loss_const") == 0)
                return &totem_config->token_retransmits_before_loss_const;
        if (strcmp(param_name, "totem.join") == 0)
                return &totem_config->join_timeout;
        if (strcmp(param_name, "totem.send_join") == 0)
                return &totem_config->send_join_timeout;
        if (strcmp(param_name, "totem.consensus") == 0)
                return &totem_config->consensus_timeout;
        if (strcmp(param_name, "totem.merge") == 0)
                return &totem_config->merge_timeout;
        if (strcmp(param_name, "totem.downcheck") == 0)
                return &totem_config->downcheck_timeout;
        if (strcmp(param_name, "totem.fail_recv_const") == 0)
                return &totem_config->fail_to_recv_const;
        if (strcmp(param_name, "totem.seqno_unchanged_const") == 0)
                return &totem_config->seqno_unchanged_const;
        if (strcmp(param_name, "totem.heartbeat_failures_allowed") == 0)
                return &totem_config->heartbeat_failures_allowed;
        if (strcmp(param_name, "totem.max_network_delay") == 0)
                return &totem_config->max_network_delay;
        if (strcmp(param_name, "totem.window_size") == 0)
                return &totem_config->window_size;
        if (strcmp(param_name, "totem.max_messages") == 0)
                return &totem_config->max_messages;
        if (strcmp(param_name, "totem.miss_count_const") == 0)
                return &totem_config->miss_count_const;
        if (strcmp(param_name, "totem.knet_pmtud_interval") == 0)
                return &totem_config->knet_pmtud_interval;
        if (strcmp(param_name, "totem.knet_compression_threshold") == 0)
                return &totem_config->knet_compression_threshold;
        if (strcmp(param_name, "totem.knet_compression_level") == 0)
                return &totem_config->knet_compression_level;
        if (strcmp(param_name, "totem.knet_compression_model") == 0)
                return &totem_config->knet_compression_model;

        return NULL;
}

/*
 * Read key_name from icmap. If key is not found or key_name == delete_key or if allow_zero is false
 * and readed value is zero, default value is used and stored into totem_config.
 */
static void totem_volatile_config_set_uint32_value (struct totem_config *totem_config,
        const char *key_name, const char *deleted_key, unsigned int default_value,
        int allow_zero_value)
{
        char runtime_key_name[ICMAP_KEYNAME_MAXLEN];

        if (icmap_get_uint32(key_name, totem_get_param_by_name(totem_config, key_name)) != CS_OK ||
            (deleted_key != NULL && strcmp(deleted_key, key_name) == 0) ||
            (!allow_zero_value && *(uint32_t *)totem_get_param_by_name(totem_config, key_name) == 0)) {
                *(uint32_t *)totem_get_param_by_name(totem_config, key_name) = default_value;
        }

        /*
         * Store totem_config value to cmap runtime section
         */
        if (strlen("runtime.config.") + strlen(key_name) >= ICMAP_KEYNAME_MAXLEN) {
                /*
                 * This shouldn't happen
                 */
                return ;
        }

        strcpy(runtime_key_name, "runtime.config.");
        strcat(runtime_key_name, key_name);

        icmap_set_uint32(runtime_key_name, *(uint32_t *)totem_get_param_by_name(totem_config, key_name));
}

static void totem_volatile_config_set_int32_value (struct totem_config *totem_config,
        const char *key_name, const char *deleted_key, int default_value,
        int allow_zero_value)
{
        char runtime_key_name[ICMAP_KEYNAME_MAXLEN];

        if (icmap_get_int32(key_name, totem_get_param_by_name(totem_config, key_name)) != CS_OK ||
            (deleted_key != NULL && strcmp(deleted_key, key_name) == 0) ||
            (!allow_zero_value && *(int32_t *)totem_get_param_by_name(totem_config, key_name) == 0)) {
                *(int32_t *)totem_get_param_by_name(totem_config, key_name) = default_value;
        }

        /*
         * Store totem_config value to cmap runtime section
         */
        if (strlen("runtime.config.") + strlen(key_name) >= ICMAP_KEYNAME_MAXLEN) {
                /*
                 * This shouldn't happen
                 */
                return ;
        }

        strcpy(runtime_key_name, "runtime.config.");
        strcat(runtime_key_name, key_name);

        icmap_set_int32(runtime_key_name, *(int32_t *)totem_get_param_by_name(totem_config, key_name));
}

static void totem_volatile_config_set_string_value (struct totem_config *totem_config,
        const char *key_name, const char *deleted_key, const char *default_value)
{
        char runtime_key_name[ICMAP_KEYNAME_MAXLEN];
        void **config_value;
        void *old_config_ptr;

        config_value = totem_get_param_by_name(totem_config, key_name);
        old_config_ptr = *config_value;
        if (icmap_get_string(key_name, totem_get_param_by_name(totem_config, key_name)) != CS_OK ||
            (deleted_key != NULL && strcmp(deleted_key, key_name) == 0)) {

                /* Need to strdup() here so that the free() below works for a default and a configured value */
                *config_value = strdup(default_value);
        }
        free(old_config_ptr);

        /*
         * Store totem_config value to cmap runtime section
         */
        if (strlen("runtime.config.") + strlen(key_name) >= ICMAP_KEYNAME_MAXLEN) {
                /*
                 * This shouldn't happen
                 */
                return ;
        }

        strcpy(runtime_key_name, "runtime.config.");
        strcat(runtime_key_name, key_name);

        icmap_set_string(runtime_key_name, (char *)*config_value);
}


/*
 * Read and validate config values from cmap and store them into totem_config. If key doesn't exists,
 * default value is stored. deleted_key is name of key beeing processed by delete operation
 * from cmap. It is considered as non existing even if it can be read. Can be NULL.
 */
static void totem_volatile_config_read (struct totem_config *totem_config, const char *deleted_key)
{
        uint32_t u32;

        totem_volatile_config_set_uint32_value(totem_config, "totem.token_retransmits_before_loss_const", deleted_key,
            TOKEN_RETRANSMITS_BEFORE_LOSS_CONST, 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.token", deleted_key, TOKEN_TIMEOUT, 0);

        if (totem_config->interfaces[0].member_count > 2) {
                u32 = TOKEN_COEFFICIENT;
                icmap_get_uint32("totem.token_coefficient", &u32);
                totem_config->token_timeout += (totem_config->interfaces[0].member_count - 2) * u32;

                /*
                 * Store totem_config value to cmap runtime section
                 */
                icmap_set_uint32("runtime.config.totem.token", totem_config->token_timeout);
        }

        totem_volatile_config_set_uint32_value(totem_config, "totem.max_network_delay", deleted_key, MAX_NETWORK_DELAY, 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.window_size", deleted_key, WINDOW_SIZE, 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.max_messages", deleted_key, MAX_MESSAGES, 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.miss_count_const", deleted_key, MISS_COUNT_CONST, 0);
        totem_volatile_config_set_uint32_value(totem_config, "totem.knet_pmtud_interval", deleted_key, KNET_PMTUD_INTERVAL, 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.token_retransmit", deleted_key,
           (int)(totem_config->token_timeout / (totem_config->token_retransmits_before_loss_const + 0.2)), 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.hold", deleted_key,
            (int)(totem_config->token_retransmit_timeout * 0.8 - (1000/HZ)), 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.join", deleted_key, JOIN_TIMEOUT, 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.consensus", deleted_key,
            (int)(float)(1.2 * totem_config->token_timeout), 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.merge", deleted_key, MERGE_TIMEOUT, 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.downcheck", deleted_key, DOWNCHECK_TIMEOUT, 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.fail_recv_const", deleted_key, FAIL_TO_RECV_CONST, 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.seqno_unchanged_const", deleted_key,
            SEQNO_UNCHANGED_CONST, 0);

        totem_volatile_config_set_uint32_value(totem_config, "totem.send_join", deleted_key, 0, 1);

        totem_volatile_config_set_uint32_value(totem_config, "totem.heartbeat_failures_allowed", deleted_key, 0, 1);

        totem_volatile_config_set_uint32_value(totem_config, "totem.knet_compression_threshold", deleted_key, 0, 1);

        totem_volatile_config_set_int32_value(totem_config, "totem.knet_compression_level", deleted_key, 0, 1);

        totem_volatile_config_set_string_value(totem_config, "totem.knet_compression_model", deleted_key, "none");


}

static int totem_volatile_config_validate (
        struct totem_config *totem_config,
        const char **error_string)
{
        static char local_error_reason[512];
        const char *error_reason = local_error_reason;

        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 than (%d ms).",
                        totem_config->max_network_delay, MINIMUM_TIMEOUT);
                goto parse_error;
        }

        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 than (%d ms).",
                        totem_config->token_timeout, MINIMUM_TIMEOUT);
                goto parse_error;
        }

        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 than (%d ms).",
                        totem_config->token_retransmit_timeout, MINIMUM_TIMEOUT);
                goto parse_error;
        }

        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 than (%d ms).",
                        totem_config->token_hold_timeout, MINIMUM_TIMEOUT);
                goto parse_error;
        }

        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 than (%d ms).",
                        totem_config->join_timeout, MINIMUM_TIMEOUT);
                goto parse_error;
        }

        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 than (%d ms).",
                        totem_config->consensus_timeout, MINIMUM_TIMEOUT);
                goto parse_error;
        }

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

        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 than (%d ms).",
                        totem_config->merge_timeout, MINIMUM_TIMEOUT);
                goto parse_error;
        }

        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 than (%d ms).",
                        totem_config->downcheck_timeout, MINIMUM_TIMEOUT);
                goto parse_error;
        }

        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 totem_get_crypto(struct totem_config *totem_config, const char **error_string)
{
        char *str;
        const char *tmp_cipher;
        const char *tmp_hash;
        const char *tmp_model;

        tmp_hash = "none";
        tmp_cipher = "none";
        tmp_model = "none";

        if (icmap_get_string("totem.crypto_model", &str) == CS_OK) {
                if (strcmp(str, "nss") == 0) {
                        tmp_model = "nss";
                }
                if (strcmp(str, "openssl") == 0) {
                        tmp_model = "openssl";
                }
                free(str);
        } else {
                tmp_model = "nss";
        }

        if (icmap_get_string("totem.crypto_cipher", &str) == CS_OK) {
                if (strcmp(str, "none") == 0) {
                        tmp_cipher = "none";
                }
                if (strcmp(str, "aes256") == 0) {
                        tmp_cipher = "aes256";
                }
                if (strcmp(str, "aes192") == 0) {
                        tmp_cipher = "aes192";
                }
                if (strcmp(str, "aes128") == 0) {
                        tmp_cipher = "aes128";
                }
                if (strcmp(str, "3des") == 0) {
                        tmp_cipher = "3des";
                }
                free(str);
        }

        if (icmap_get_string("totem.crypto_hash", &str) == CS_OK) {
                if (strcmp(str, "none") == 0) {
                        tmp_hash = "none";
                }
                if (strcmp(str, "md5") == 0) {
                        tmp_hash = "md5";
                }
                if (strcmp(str, "sha1") == 0) {
                        tmp_hash = "sha1";
                }
                if (strcmp(str, "sha256") == 0) {
                        tmp_hash = "sha256";
                }
                if (strcmp(str, "sha384") == 0) {
                        tmp_hash = "sha384";
                }
                if (strcmp(str, "sha512") == 0) {
                        tmp_hash = "sha512";
                }
                free(str);
        }

        if ((strcmp(tmp_cipher, "none") != 0) &&
            (strcmp(tmp_hash, "none") == 0)) {
                *error_string = "crypto_cipher requires crypto_hash with value other than none";
                return -1;
        }

        if (strcmp(tmp_model, "none") == 0) {
                *error_string = "crypto_model should be 'nss' or 'openssl'";
                return -1;
        }

        free(totem_config->crypto_cipher_type);
        free(totem_config->crypto_hash_type);
        free(totem_config->crypto_model);

        totem_config->crypto_cipher_type = strdup(tmp_cipher);
        totem_config->crypto_hash_type = strdup(tmp_hash);
        totem_config->crypto_model = strdup(tmp_model);

        return 0;
}

static int nodelist_byname(const char *find_name, int strip_domain)
{
        icmap_iter_t iter;
        const char *iter_key;
        char name_str[ICMAP_KEYNAME_MAXLEN];
        int res = 0;
        unsigned int node_pos;
        char *name;
        unsigned int namelen;

        iter = icmap_iter_init("nodelist.node.");
        while ((iter_key = icmap_iter_next(iter, NULL, NULL)) != NULL) {
                res = sscanf(iter_key, "nodelist.node.%u.%s", &node_pos, name_str);
                if (res != 2) {
                        continue;
                }
                /* ring0_addr is allowed as a fallback */
                if (strcmp(name_str, "name") && strcmp(name_str, "ring0_addr")) {
                        continue;
                }
                if (icmap_get_string(iter_key, &name) != CS_OK) {
                        continue;
                }
                namelen = strlen(name);

                if (strip_domain) {
                        char *dot;
                        dot = strchr(name, '.');
                        if (dot) {
                                namelen = name - dot - 1;
                        }
                }
                if (strncmp(find_name, name, namelen) == 0 &&
                    strlen(find_name) == strlen(name)) {
                        icmap_iter_finalize(iter);
                        return node_pos;
                }
        }
        icmap_iter_finalize(iter);
        return -1;
}

/* Compare two addresses */
static int ipaddr_equal(struct sockaddr_storage *addr1, struct sockaddr_storage *addr2)
{
        int addrlen = 0;

        if (addr1->ss_family != addr2->ss_family)
                return 0;

        if (addr1->ss_family == AF_INET) {
                addrlen = sizeof(struct sockaddr_in);
        }
        if (addr1->ss_family == AF_INET6) {
                addrlen = sizeof(struct sockaddr_in6);
        }
        assert(addrlen);

        if (memcmp(addr1, addr2, addrlen) == 0)
                return 1;
        else
                return 0;

}


/* Finds the local node and returns its position in the nodelist.
 * Uses nodelist.local_node_pos as a cache to save effort
 */
static int find_local_node(int use_cache)
{
        char nodename2[PATH_MAX];
        char name_str[ICMAP_KEYNAME_MAXLEN];
        icmap_iter_t iter;
        const char *iter_key;
        unsigned int cached_pos;
        char *dot = NULL;
        const char *node;
        struct ifaddrs *ifa, *ifa_list;
        struct sockaddr *sa;
        int found = 0;
        int node_pos = -1;
        int res;
        struct utsname utsname;

        /* Check for cached value first */
        if (use_cache) {
                if (icmap_get_uint32("nodelist.local_node_pos", &cached_pos) == CS_OK) {
                        return cached_pos;
                }
        }

        res = uname(&utsname);
        if (res) {
                return -1;
        }
        node = utsname.nodename;

        /* 1. Exact match */
        node_pos = nodelist_byname(node, 0);
        if (node_pos > -1) {
                found = 1;
                goto ret_found;
        }

        /* 2. Try to match with increasingly more
         * specific versions of it
         */
        strcpy(nodename2, node);
        dot = strrchr(nodename2, '.');
        while (dot) {
                *dot = '\0';

                node_pos = nodelist_byname(nodename2, 0);
                if (node_pos > -1) {
                        found = 1;
                        goto ret_found;
                }
                dot = strrchr(nodename2, '.');
        }

        node_pos = nodelist_byname(nodename2, 1);
        if (node_pos > -1) {
                found = 1;
                goto ret_found;
        }

        /*
         * The corosync.conf name may not be related to uname at all,
         * they may match a hostname on some network interface.
         */
        if (getifaddrs(&ifa_list))
                return -1;

        for (ifa = ifa_list; ifa; ifa = ifa->ifa_next) {
                socklen_t salen = 0;

                /* Restore this */
                strcpy(nodename2, node);
                sa = ifa->ifa_addr;
                if (!sa) {
                        continue;
                }
                if (sa->sa_family != AF_INET && sa->sa_family != AF_INET6) {
                        continue;
                }

                if (sa->sa_family == AF_INET) {
                        salen = sizeof(struct sockaddr_in);
                }
                if (sa->sa_family == AF_INET6) {
                        salen = sizeof(struct sockaddr_in6);
                }

                if (getnameinfo(sa, salen,
                                nodename2, sizeof(nodename2),
                                NULL, 0, 0) == 0) {

                        node_pos = nodelist_byname(nodename2, 0);
                        if (node_pos > -1) {
                                found = 1;
                                goto out;
                        }

                        /* Truncate this name and try again */
                        dot = strchr(nodename2, '.');
                        if (dot) {
                                *dot = '\0';

                                node_pos = nodelist_byname(nodename2, 0);
                                if (node_pos > -1) {
                                        found = 1;
                                        goto out;
                                }
                        }
                }

                /* See if it's the IP address that's in corosync.conf */
                if (getnameinfo(sa, sizeof(*sa),
                                nodename2, sizeof(nodename2),
                                NULL, 0, NI_NUMERICHOST))
                        continue;

                node_pos = nodelist_byname(nodename2, 0);
                if (node_pos > -1) {
                        found = 1;
                        goto out;
                }
        }

 out:
        if (found) {
                freeifaddrs(ifa_list);
                goto ret_found;
        }

        /*
         * This section covers the usecase where the nodename specified in cluster.conf
         * is an alias specified in /etc/hosts. For example:
         * <ipaddr> hostname alias1 alias2
         * and <clusternode name="alias2">
         * the above calls use uname and getnameinfo does not return aliases.
         * here we take the name specified in cluster.conf, resolve it to an address
         * and then compare against all known local ip addresses.
         * if we have a match, we found our nodename. In theory this chunk of code
         * could replace all the checks above, but let's avoid any possible regressions
         * and use it as last.
         */

        iter = icmap_iter_init("nodelist.node.");
        while ((iter_key = icmap_iter_next(iter, NULL, NULL)) != NULL) {
                char *dbnodename = NULL;
                struct addrinfo hints;
                struct addrinfo *result = NULL, *rp = NULL;

                res = sscanf(iter_key, "nodelist.node.%u.%s", &node_pos, name_str);
                if (res != 2) {
                        continue;
                }
                /* 'ring0_addr' is allowed as a fallback, but 'name' will be found first
                 * because the names are in alpha order.
                 */
                if (strcmp(name_str, "name") && strcmp(name_str, "ring0_addr")) {
                        continue;
                }
                if (icmap_get_string(iter_key, &dbnodename) != CS_OK) {
                        continue;
                }

                memset(&hints, 0, sizeof(struct addrinfo));
                hints.ai_family = AF_UNSPEC;
                hints.ai_socktype = SOCK_DGRAM;
                hints.ai_flags = 0;
                hints.ai_protocol = IPPROTO_UDP;

                if (getaddrinfo(dbnodename, NULL, &hints, &result)) {
                        continue;
                }

                for (rp = result; rp != NULL; rp = rp->ai_next) {
                        for (ifa = ifa_list; ifa; ifa = ifa->ifa_next) {
                                if (ifa->ifa_addr &&
                                    ipaddr_equal((struct sockaddr_storage *)rp->ai_addr,
                                                 (struct sockaddr_storage *)ifa->ifa_addr)) {
                                        freeaddrinfo(result);
                                        found = 1;
                                        goto out2;
                                }
                        }
                }

                freeaddrinfo(result);
        }
out2:
        icmap_iter_finalize(iter);
        freeifaddrs(ifa_list);

ret_found:
        if (found) {
                res = icmap_set_uint32("nodelist.local_node_pos", node_pos);
        }

        return node_pos;
}

static int totem_config_get_ip_version(struct totem_config *totem_config)
{
        int res;
        char *str;

        res = AF_INET;
        if (totem_config->transport_number == TOTEM_TRANSPORT_KNET) {
                res = AF_UNSPEC;
        } else {
                if (icmap_get_string("totem.ip_version", &str) == CS_OK) {
                        if (strcmp(str, "ipv4") == 0) {
                                res = AF_INET;
                        }
                        if (strcmp(str, "ipv6") == 0) {
                                res = AF_INET6;
                        }
                        free(str);
                }
        }

        return (res);
}

static uint16_t generate_cluster_id (const char *cluster_name)
{
        int i;
        int value = 0;

        for (i = 0; i < strlen(cluster_name); i++) {
                value <<= 1;
                value += cluster_name[i];
        }

        return (value & 0xFFFF);
}

static int get_cluster_mcast_addr (
                const char *cluster_name,
                unsigned int linknumber,
                int ip_version,
                struct totem_ip_address *res)
{
        uint16_t clusterid;
        char addr[INET6_ADDRSTRLEN + 1];
        int err;

        if (cluster_name == NULL) {
                return (-1);
        }

        clusterid = generate_cluster_id(cluster_name) + linknumber;
        memset (res, 0, sizeof(*res));

        switch (ip_version) {
        case AF_INET:
                snprintf(addr, sizeof(addr), "239.192.%d.%d", clusterid >> 8, clusterid % 0xFF);
                break;
        case AF_INET6:
                snprintf(addr, sizeof(addr), "ff15::%x", clusterid);
                break;
        default:
                /*
                 * Unknown family
                 */
                return (-1);
        }

        err = totemip_parse (res, addr, ip_version);

        return (err);
}

static unsigned int generate_nodeid_for_duplicate_test(
        struct totem_config *totem_config,
        char *addr)
{
        unsigned int nodeid;
        struct totem_ip_address totemip;

        /* AF_INET hard-coded here because auto-generated nodeids
           are only for IPv4 */
        if (totemip_parse(&totemip, addr, AF_INET) != 0)
                return -1;

        memcpy (&nodeid, &totemip.addr, sizeof (unsigned int));

#if __BYTE_ORDER == __LITTLE_ENDIAN
        nodeid = swab32 (nodeid);
#endif

        if (totem_config->clear_node_high_bit) {
                nodeid &= 0x7FFFFFFF;
        }
        return nodeid;
}

static int check_for_duplicate_nodeids(
        struct totem_config *totem_config,
        const char **error_string)
{
        icmap_iter_t iter;
        icmap_iter_t subiter;
        const char *iter_key;
        int res = 0;
        int retval = 0;
        char tmp_key[ICMAP_KEYNAME_MAXLEN];
        char *ring0_addr=NULL;
        char *ring0_addr1=NULL;
        unsigned int node_pos;
        unsigned int node_pos1;
        unsigned int nodeid;
        unsigned int nodeid1;
        int autogenerated;

        iter = icmap_iter_init("nodelist.node.");
        while ((iter_key = icmap_iter_next(iter, NULL, NULL)) != NULL) {
                res = sscanf(iter_key, "nodelist.node.%u.%s", &node_pos, tmp_key);
                if (res != 2) {
                        continue;
                }

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

                snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "nodelist.node.%u.nodeid", node_pos);
                autogenerated = 0;

                /* Generated nodeids are only allowed for UDP/UDPU so ring0_addr is valid here */
                if (icmap_get_uint32(tmp_key, &nodeid) != CS_OK) {

                        snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "nodelist.node.%u.ring0_addr", node_pos);
                        if (icmap_get_string(tmp_key, &ring0_addr) != CS_OK) {
                                continue;
                        }

                        /* Generate nodeid so we can check that auto-generated nodeids don't clash either */
                        nodeid = generate_nodeid_for_duplicate_test(totem_config, ring0_addr);
                        if (nodeid == -1) {
                                continue;
                        }
                        autogenerated = 1;
                }

                node_pos1 = 0;
                subiter = icmap_iter_init("nodelist.node.");
                while (((iter_key = icmap_iter_next(subiter, NULL, NULL)) != NULL) && (node_pos1 < node_pos)) {
                        res = sscanf(iter_key, "nodelist.node.%u.%s", &node_pos1, tmp_key);
                        if ((res != 2) || (node_pos1 >= node_pos)) {
                                continue;
                        }

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

                        snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "nodelist.node.%u.nodeid", node_pos1);
                        if (icmap_get_uint32(tmp_key, &nodeid1) != CS_OK) {

                                snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "nodelist.node.%u.ring0_addr", node_pos1);
                                if (icmap_get_string(tmp_key, &ring0_addr1) != CS_OK) {
                                        continue;
                                }
                                nodeid1 = generate_nodeid_for_duplicate_test(totem_config, ring0_addr1);
                                if (nodeid1 == -1) {
                                        continue;
                                }
                        }

                        if (nodeid == nodeid1) {
                                retval = -1;
                                snprintf (error_string_response, sizeof(error_string_response),
                                          "Nodeid %u%s%s%s appears twice in corosync.conf", nodeid,
                                          autogenerated?"(autogenerated from ":"",
                                          autogenerated?ring0_addr:"",
                                          autogenerated?")":"");
                                log_printf (LOGSYS_LEVEL_ERROR, error_string_response);
                                *error_string = error_string_response;
                                break;
                        }
                }
                icmap_iter_finalize(subiter);
        }
        icmap_iter_finalize(iter);
        return retval;
}


/*
 * This needs to be done last of all. It would be nice to do it when reading the
 * interface params, but the totem params need to have them to be read first. We
 * need both, so this is a way round that circular dependancy.
 */
static void calc_knet_ping_timers(struct totem_config *totem_config)
{
        char runtime_key_name[ICMAP_KEYNAME_MAXLEN];
        int interface;

        for (interface = 0; interface < INTERFACE_MAX; interface++) {

                if (totem_config->interfaces[interface].configured) {
                        if (!totem_config->interfaces[interface].knet_ping_timeout) {
                                totem_config->interfaces[interface].knet_ping_timeout =
                                        totem_config->token_timeout / totem_config->interfaces[interface].knet_pong_count;
                        }
                        snprintf(runtime_key_name, sizeof(runtime_key_name),
                                 "runtime.config.totem.interface.%d.knet_ping_timeout", interface);
                        icmap_set_uint32(runtime_key_name, totem_config->interfaces[interface].knet_ping_timeout);

                        if (!totem_config->interfaces[interface].knet_ping_interval) {
                                totem_config->interfaces[interface].knet_ping_interval =
                                        totem_config->token_timeout / (totem_config->interfaces[interface].knet_pong_count * 2);
                        }
                        snprintf(runtime_key_name, sizeof(runtime_key_name),
                                 "runtime.config.totem.interface.%d.knet_ping_interval", interface);
                        icmap_set_uint32(runtime_key_name, totem_config->interfaces[interface].knet_ping_interval);
                }
        }
}

/*
 * Compute difference between two set of totem interface arrays. set1 and set2
 * are changed so for same ring, ip existing in both set1 and set2 are cleared
 * (set to 0), and ips which are only in set1 or set2 remains untouched.
 * totempg_node_add/remove is called.
 */
static void compute_interfaces_diff(struct totem_interface *set1,
        struct totem_interface *set2)
{
        int ring_no, set1_pos, set2_pos;
        struct totem_ip_address empty_ip_address;

        memset(&empty_ip_address, 0, sizeof(empty_ip_address));

        for (ring_no = 0; ring_no < INTERFACE_MAX; ring_no++) {
                if (!set1[ring_no].configured && !set2[ring_no].configured) {
                        continue;
                }

                for (set1_pos = 0; set1_pos < set1[ring_no].member_count; set1_pos++) {
                        for (set2_pos = 0; set2_pos < set2[ring_no].member_count; set2_pos++) {
                                /*
                                 * For current ring_no remove all set1 items existing
                                 * in set2
                                 */
                                if (memcmp(&set1[ring_no].member_list[set1_pos],
                                    &set2[ring_no].member_list[set2_pos],
                                    sizeof(struct totem_ip_address)) == 0) {
                                        memset(&set1[ring_no].member_list[set1_pos], 0,
                                            sizeof(struct totem_ip_address));
                                        memset(&set2[ring_no].member_list[set2_pos], 0,
                                            sizeof(struct totem_ip_address));
                                }
                        }
                }
        }

        for (ring_no = 0; ring_no < INTERFACE_MAX; ring_no++) {
                for (set1_pos = 0; set1_pos < set1[ring_no].member_count; set1_pos++) {
                        /*
                         * All items which remained in set1 doesn't exists in set2 any longer so
                         * node has to be removed.
                         */
                        if (memcmp(&set1[ring_no].member_list[set1_pos], &empty_ip_address, sizeof(empty_ip_address)) != 0) {
                                log_printf(LOGSYS_LEVEL_DEBUG,
                                        "removing dynamic member %s for ring %u",
                                        totemip_print(&set1[ring_no].member_list[set1_pos]),
                                        ring_no);

                                totempg_member_remove(&set1[ring_no].member_list[set1_pos], ring_no);
                        }
                }
                if (!set2[ring_no].configured) {
                        continue;
                }
                for (set2_pos = 0; set2_pos < set2[ring_no].member_count; set2_pos++) {
                        /*
                         * All items which remained in set2 doesn't existed in set1 so this is no node
                         * and has to be added.
                         */
                        if (memcmp(&set2[ring_no].member_list[set2_pos], &empty_ip_address, sizeof(empty_ip_address)) != 0) {
                                log_printf(LOGSYS_LEVEL_DEBUG,
                                        "adding dynamic member %s for ring %u",
                                        totemip_print(&set2[ring_no].member_list[set2_pos]),
                                        ring_no);

                                totempg_member_add(&set2[ring_no].member_list[set2_pos], ring_no);
                        }
                }
        }
}

/*
 * Reconfigure links in totempg. Sets new local IP address and adds params for new links.
 */
static void reconfigure_links(struct totem_config *totem_config)
{
        int i;
        char tmp_key[ICMAP_KEYNAME_MAXLEN];
        char *addr_string;
        struct totem_ip_address local_ip;
        int err;
        int local_node_pos = find_local_node(0);

        for (i = 0; i<INTERFACE_MAX; i++) {
                if (!totem_config->interfaces[i].configured) {
                        continue;
                }

                log_printf(LOGSYS_LEVEL_INFO, "Configuring link %d\n", i);

                snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "nodelist.node.%u.ring%u_addr", local_node_pos, i);
                if (icmap_get_string(tmp_key, &addr_string) != CS_OK) {
                        continue;
                }

                err = totemip_parse(&local_ip, addr_string, AF_UNSPEC);
                if (err != 0) {
                        continue;
                }
                local_ip.nodeid = totem_config->node_id;

                /* In case this is a new link, fill in the defaults if there was no interface{} section for it */
                if (!totem_config->interfaces[i].knet_link_priority)
                        totem_config->interfaces[i].knet_link_priority = 1;

                /* knet_ping_interval & knet_ping_timeout are set later once we know all the other params */

                if (!totem_config->interfaces[i].knet_ping_precision)
                        totem_config->interfaces[i].knet_ping_precision = KNET_PING_PRECISION;
                if (!totem_config->interfaces[i].knet_pong_count)
                        totem_config->interfaces[i].knet_pong_count = KNET_PONG_COUNT;
                if (!totem_config->interfaces[i].knet_transport)
                        totem_config->interfaces[i].knet_transport = KNET_TRANSPORT_UDP;
                if (!totem_config->interfaces[i].ip_port)
                        totem_config->interfaces[i].ip_port = DEFAULT_PORT + i;

                totempg_iface_set(&local_ip, totem_config->interfaces[i].ip_port, i);
        }
}

static void put_nodelist_members_to_config(struct totem_config *totem_config, int reload)
{
        icmap_iter_t iter, iter2;
        const char *iter_key, *iter_key2;
        int res = 0;
        unsigned int node_pos;
        char tmp_key[ICMAP_KEYNAME_MAXLEN];
        char tmp_key2[ICMAP_KEYNAME_MAXLEN];
        char *node_addr_str;
        int member_count;
        unsigned int linknumber = 0;
        int i, j;
        struct totem_interface *new_interfaces = NULL;

        if (reload) {
                /*
                 * We need to compute diff only for reload. Also for initial configuration
                 * not all totem structures are initialized so corosync will crash during
                 * member_add/remove
                 */
                new_interfaces = malloc (sizeof (struct totem_interface) * INTERFACE_MAX);
                assert(new_interfaces != NULL);
        }

        /* Clear out nodelist so we can put the new one in if needed */
        for (i = 0; i < INTERFACE_MAX; i++) {
                for (j = 0; j < PROCESSOR_COUNT_MAX; j++) {
                        memset(&totem_config->interfaces[i].member_list[j], 0, sizeof(struct totem_ip_address));
                }
                totem_config->interfaces[i].member_count = 0;
        }

        iter = icmap_iter_init("nodelist.node.");
        while ((iter_key = icmap_iter_next(iter, NULL, NULL)) != NULL) {
                res = sscanf(iter_key, "nodelist.node.%u.%s", &node_pos, tmp_key);
                if (res != 2) {
                        continue;
                }
                if (strcmp(tmp_key, "nodeid") != 0) {
                        continue;
                }

                snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "nodelist.node.%u.", node_pos);
                iter2 = icmap_iter_init(tmp_key);
                while ((iter_key2 = icmap_iter_next(iter2, NULL, NULL)) != NULL) {
                        unsigned int nodeid;

                        snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "nodelist.node.%u.nodeid", node_pos);
                        if (icmap_get_uint32(tmp_key, &nodeid) != CS_OK) {
                        }

                        res = sscanf(iter_key2, "nodelist.node.%u.ring%u%s", &node_pos, &linknumber, tmp_key2);
                        if (res != 3 || strcmp(tmp_key2, "_addr") != 0) {
                                continue;
                        }

                        if (icmap_get_string(iter_key2, &node_addr_str) != CS_OK) {
                                continue;
                        }

                        member_count = totem_config->interfaces[linknumber].member_count;
                        res = totemip_parse(&totem_config->interfaces[linknumber].member_list[member_count],
                                                node_addr_str, totem_config->ip_version);
                        if (res != -1) {
                                totem_config->interfaces[linknumber].member_list[member_count].nodeid = nodeid;
                                totem_config->interfaces[linknumber].member_count++;
                        }
                        totem_config->interfaces[linknumber].configured = 1;
                        free(node_addr_str);
                }

                icmap_iter_finalize(iter2);
        }

        icmap_iter_finalize(iter);

        if (reload) {
                log_printf(LOGSYS_LEVEL_DEBUG, "About to reconfigure links from nodelist.\n");
                reconfigure_links(totem_config);

                memcpy(new_interfaces, totem_config->interfaces, sizeof (struct totem_interface) * INTERFACE_MAX);

                compute_interfaces_diff(totem_config->orig_interfaces, new_interfaces);

                free(new_interfaces);
        }
}

static void nodelist_dynamic_notify(
        int32_t event,
        const char *key_name,
        struct icmap_notify_value new_val,
        struct icmap_notify_value old_val,
        void *user_data)
{
        int res;
        unsigned int ring_no;
        unsigned int member_no;
        char tmp_str[ICMAP_KEYNAME_MAXLEN];
        uint8_t reloading;
        struct totem_config *totem_config = (struct totem_config *)user_data;

        /*
        * If a full reload is in progress then don't do anything until it's done and
        * can reconfigure it all atomically
        */
        if (icmap_get_uint8("config.totemconfig_reload_in_progress", &reloading) == CS_OK && reloading) {
                return ;
        }

        res = sscanf(key_name, "nodelist.node.%u.ring%u%s", &member_no, &ring_no, tmp_str);
        if (res != 3)
                return ;

        if (strcmp(tmp_str, "_addr") != 0) {
                return;
        }

        put_nodelist_members_to_config(totem_config, 1);
}



static void config_convert_nodelist_to_interface(struct totem_config *totem_config)
{
        int res = 0;
        int node_pos;
        char tmp_key[ICMAP_KEYNAME_MAXLEN];
        char tmp_key2[ICMAP_KEYNAME_MAXLEN];
        char *node_addr_str;
        unsigned int linknumber = 0;
        icmap_iter_t iter;
        const char *iter_key;

        node_pos = find_local_node(1);
        if (node_pos > -1) {
                /*
                 * We found node, so create interface section
                 */
                snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "nodelist.node.%u.", node_pos);
                iter = icmap_iter_init(tmp_key);
                while ((iter_key = icmap_iter_next(iter, NULL, NULL)) != NULL) {
                        res = sscanf(iter_key, "nodelist.node.%u.ring%u%s", &node_pos, &linknumber, tmp_key2);
                        if (res != 3 || strcmp(tmp_key2, "_addr") != 0) {
                                continue ;
                        }

                        if (icmap_get_string(iter_key, &node_addr_str) != CS_OK) {
                                continue;
                        }

                        snprintf(tmp_key2, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.bindnetaddr", linknumber);
                        icmap_set_string(tmp_key2, node_addr_str);
                        free(node_addr_str);
                }
                icmap_iter_finalize(iter);
        }
}

static int get_interface_params(struct totem_config *totem_config,
                                const char **error_string, uint64_t *warnings,
                                int reload)
{
        int res = 0;
        unsigned int linknumber = 0;
        int member_count = 0;
        int i;
        icmap_iter_t iter, member_iter;
        const char *iter_key;
        const char *member_iter_key;
        char linknumber_key[ICMAP_KEYNAME_MAXLEN];
        char tmp_key[ICMAP_KEYNAME_MAXLEN];
        uint8_t u8;
        uint32_t u32;
        char *str;
        char *cluster_name = NULL;

        if (reload) {
                for (i=0; i<INTERFACE_MAX; i++) {
                        /*
                         * Set back to defaults things that might have been configured and
                         * now have been taken out of corosync.conf. These won't be caught by the
                         * code below which only looks at interface{} sections that actually exist.
                         */
                        totem_config->interfaces[i].configured = 0;
                        totem_config->interfaces[i].knet_ping_timeout = 0;
                        totem_config->interfaces[i].knet_ping_interval = 0;
                        totem_config->interfaces[i].knet_ping_precision = KNET_PING_PRECISION;
                        totem_config->interfaces[i].knet_pong_count = KNET_PONG_COUNT;
                }
        }
        if (icmap_get_string("totem.cluster_name", &cluster_name) != CS_OK) {
                cluster_name = NULL;
        }

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

                if (strcmp(tmp_key, "bindnetaddr") != 0 && totem_config->transport_number == TOTEM_TRANSPORT_UDP) {
                        continue;
                }

                member_count = 0;
                linknumber = atoi(linknumber_key);

                if (linknumber >= INTERFACE_MAX) {
                        free(cluster_name);

                        snprintf (error_string_response, sizeof(error_string_response),
                            "parse error in config: interface ring number %u is bigger than allowed maximum %u\n",
                            linknumber, INTERFACE_MAX - 1);

                        *error_string = error_string_response;
                        return -1;
                }

                /* These things are only valid for the initial read */
                if (!reload) {
                        /*
                         * Get the bind net address
                         */
                        snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.bindnetaddr", linknumber);

                        if (icmap_get_string(tmp_key, &str) == CS_OK) {
                                res = totemip_parse (&totem_config->interfaces[linknumber].bindnet, str,
                                                     totem_config->ip_version);
                                free(str);
                        }

                        /*
                         * Get interface multicast address
                         */
                        snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.mcastaddr", linknumber);
                        if (icmap_get_string(tmp_key, &str) == CS_OK) {
                                res = totemip_parse (&totem_config->interfaces[linknumber].mcast_addr, str, totem_config->ip_version);
                                free(str);
                        } else {
                                /*
                                 * User not specified address -> autogenerate one from cluster_name key
                                 * (if available). Return code is intentionally ignored, because
                                 * udpu doesn't need mcastaddr and validity of mcastaddr for udp is
                                 * checked later anyway.
                                 */
                                (void)get_cluster_mcast_addr (cluster_name,
                                                              linknumber,
                                                              totem_config->ip_version,
                                                              &totem_config->interfaces[linknumber].mcast_addr);
                        }

                        snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.broadcast", linknumber);
                        if (icmap_get_string(tmp_key, &str) == CS_OK) {
                                if (strcmp (str, "yes") == 0) {
                                        totem_config->broadcast_use = 1;
                                }
                                free(str);
                        }
                }

                /* These things are only valid for the initial read OR a newly-defined link */
                if (!reload || (totem_config->interfaces[linknumber].configured == 0)) {

                        /*
                         * Get mcast port
                         */
                        snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.mcastport", linknumber);
                        if (icmap_get_uint16(tmp_key, &totem_config->interfaces[linknumber].ip_port) != CS_OK) {
                                if (totem_config->broadcast_use) {
                                        totem_config->interfaces[linknumber].ip_port = DEFAULT_PORT + (2 * linknumber);
                                } else {
                                        totem_config->interfaces[linknumber].ip_port = DEFAULT_PORT + linknumber;
                                }
                        }

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

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

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

                        totem_config->interfaces[linknumber].knet_transport = KNET_DEFAULT_TRANSPORT;
                        snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.knet_transport", linknumber);
                        if (icmap_get_string(tmp_key, &str) == CS_OK) {
                                if (strcmp(str, "sctp") == 0) {
                                        totem_config->interfaces[linknumber].knet_transport = KNET_TRANSPORT_SCTP;
                                }
                                else if (strcmp(str, "udp") == 0) {
                                        totem_config->interfaces[linknumber].knet_transport = KNET_TRANSPORT_UDP;
                                }
                                else {
                                        *error_string = "Unrecognised knet_transport. expected 'udp' or 'sctp'";
                                        return -1;
                                }
                        }
                }
                totem_config->interfaces[linknumber].configured = 1;

                /*
                 * Get the knet link params
                 */
                totem_config->interfaces[linknumber].knet_link_priority = 1;
                snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.knet_link_priority", linknumber);

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

                totem_config->interfaces[linknumber].knet_ping_interval = 0; /* real default applied later */
                snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.knet_ping_interval", linknumber);
                if (icmap_get_uint32(tmp_key, &u32) == CS_OK) {
                        totem_config->interfaces[linknumber].knet_ping_interval = u32;
                }
                totem_config->interfaces[linknumber].knet_ping_timeout = 0; /* real default applied later */
                snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.knet_ping_timeout", linknumber);
                if (icmap_get_uint32(tmp_key, &u32) == CS_OK) {
                        totem_config->interfaces[linknumber].knet_ping_timeout = u32;
                }
                totem_config->interfaces[linknumber].knet_ping_precision = KNET_PING_PRECISION;
                snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.knet_ping_precision", linknumber);
                if (icmap_get_uint32(tmp_key, &u32) == CS_OK) {
                        totem_config->interfaces[linknumber].knet_ping_precision = u32;
                }
                totem_config->interfaces[linknumber].knet_pong_count = KNET_PONG_COUNT;
                snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.knet_pong_count", linknumber);
                if (icmap_get_uint32(tmp_key, &u32) == CS_OK) {
                        totem_config->interfaces[linknumber].knet_pong_count = u32;
                }

                snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.member.", linknumber);
                member_iter = icmap_iter_init(tmp_key);
                while ((member_iter_key = icmap_iter_next(member_iter, NULL, NULL)) != NULL) {
                        if (member_count == 0) {
                                if (icmap_get_string("nodelist.node.0.ring0_addr", &str) == CS_OK) {
                                        free(str);
                                        *warnings |= TOTEM_CONFIG_WARNING_MEMBERS_IGNORED;
                                        break;
                                } else {
                                        *warnings |= TOTEM_CONFIG_WARNING_MEMBERS_DEPRECATED;
                                }
                        }

                        if (icmap_get_string(member_iter_key, &str) == CS_OK) {
                                res = totemip_parse (&totem_config->interfaces[linknumber].member_list[member_count++],
                                                str, totem_config->ip_version);
                        }
                }
                icmap_iter_finalize(member_iter);

                totem_config->interfaces[linknumber].member_count = member_count;

        }
        icmap_iter_finalize(iter);

        return 0;
}

extern int totem_config_read (
        struct totem_config *totem_config,
        const char **error_string,
        uint64_t *warnings)
{
        int res = 0;
        char *str, *ring0_addr_str;
        char tmp_key[ICMAP_KEYNAME_MAXLEN];
        uint16_t u16;
        int i;
        int local_node_pos;
        int nodeid_set;

        *warnings = 0;

        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;
        }

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

                if (strcmp (str, "udp") == 0) {
                        totem_config->transport_number = TOTEM_TRANSPORT_UDP;
                }

                if (strcmp (str, "knet") == 0) {
                        totem_config->transport_number = TOTEM_TRANSPORT_KNET;
                }

                free(str);
        }

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

        strcpy (totem_config->link_mode, "passive");

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

        if (totem_get_crypto(totem_config, error_string) != 0) {
                return -1;
        }

        if (icmap_get_string("totem.link_mode", &str) == CS_OK) {
                if (strlen(str) >= TOTEM_LINK_MODE_BYTES) {
                        *error_string = "totem.link_mode is too long";
                        free(str);

                        return -1;
                }
                strcpy (totem_config->link_mode, str);
                free(str);
        }

        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);

        totem_config->ip_version = totem_config_get_ip_version(totem_config);

        if (icmap_get_string("totem.interface.0.bindnetaddr", &str) != CS_OK) {
                /*
                 * We were not able to find ring 0 bindnet addr. Try to use nodelist informations
                 */
                config_convert_nodelist_to_interface(totem_config);
        } else {
                if (icmap_get_string("nodelist.node.0.ring0_addr", &ring0_addr_str) == CS_OK) {
                        /*
                         * Both bindnetaddr and ring0_addr are set.
                         * Log warning information, and use nodelist instead
                         */
                        *warnings |= TOTEM_CONFIG_BINDNETADDR_NODELIST_SET;

                        config_convert_nodelist_to_interface(totem_config);

                        free(ring0_addr_str);
                }

                free(str);
        }

        /*
         * Broadcast option is global but set in interface section,
         * so reset before processing interfaces.
         */
        totem_config->broadcast_use = 0;

        res = get_interface_params(totem_config, error_string, warnings, 0);
        if (res < 0) {
                return res;
        }

        /*
         * Use broadcast is global, so if set, make sure to fill mcast addr correctly
         * broadcast is only supported for UDP so just do interface 0;
         */
        if (totem_config->broadcast_use) {
                totemip_parse (&totem_config->interfaces[0].mcast_addr,
                               "255.255.255.255", 0);
        }


        /*
         * Store automatically generated items back to icmap only for UDP
         */
        if (totem_config->transport_number == TOTEM_TRANSPORT_UDP) {
                for (i = 0; i < INTERFACE_MAX; i++) {
                        if (!totem_config->interfaces[i].configured) {
                                continue;
                        }
                        snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.mcastaddr", i);
                        if (icmap_get_string(tmp_key, &str) == CS_OK) {
                                free(str);
                        } else {
                                str = (char *)totemip_print(&totem_config->interfaces[i].mcast_addr);
                                icmap_set_string(tmp_key, str);
                        }

                        snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "totem.interface.%u.mcastport", i);
                        if (icmap_get_uint16(tmp_key, &u16) != CS_OK) {
                                icmap_set_uint16(tmp_key, totem_config->interfaces[i].ip_port);
                        }
                }
        }

        /*
         * Check existence of nodelist
         */
        if ((icmap_get_string("nodelist.node.0.name", &str) == CS_OK) ||
            (icmap_get_string("nodelist.node.0.ring0_addr", &str) == CS_OK)) {
                free(str);
                /*
                 * find local node
                 */
                local_node_pos = find_local_node(1);
                if (local_node_pos != -1) {

                        snprintf(tmp_key, ICMAP_KEYNAME_MAXLEN, "nodelist.node.%u.nodeid", local_node_pos);

                        nodeid_set = (totem_config->node_id != 0);
                        if (icmap_get_uint32(tmp_key, &totem_config->node_id) == CS_OK && nodeid_set) {
                                *warnings |= TOTEM_CONFIG_WARNING_TOTEM_NODEID_IGNORED;
                        }
                        if ((totem_config->transport_number == TOTEM_TRANSPORT_KNET) && (!totem_config->node_id)) {
                                *error_string = "With knet, you must specify nodeid for current node";
                                return -1;
                        }

                        /* Users must not change this */
                        icmap_set_ro_access("nodelist.local_node_pos", 0, 1);
                }

                put_nodelist_members_to_config(totem_config, 0);
        }

        /*
         * Get things that might change in the future (and can depend on totem_config->interfaces);
         */
        totem_volatile_config_read(totem_config, NULL);

        calc_knet_ping_timers(totem_config);

        icmap_set_uint8("config.totemconfig_reload_in_progress", 0);

        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,j;
        uint32_t u32;
        int num_configured = 0;
        unsigned int interface_max = INTERFACE_MAX;

        for (i = 0; i < INTERFACE_MAX; i++) {
                if (totem_config->interfaces[i].configured) {
                        num_configured++;
                }
        }
        if (num_configured == 0) {
                error_reason = "No interfaces defined";
                goto parse_error;
        }

        /* Check we found a local node name */
        if (icmap_get_uint32("nodelist.local_node_pos", &u32) != CS_OK) {
                error_reason = "No valid name found for local host";
                goto parse_error;
        }

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

                struct totem_ip_address null_addr;

                if (!totem_config->interfaces[i].configured) {
                        continue;
                }

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

                if ((totem_config->transport_number == TOTEM_TRANSPORT_UDP) &&
                        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].knet_link_priority > 255) {
                        error_reason = "Invalid link priority (should be 0..255)";
                        goto parse_error;
                }
                if (totem_config->transport_number != TOTEM_TRANSPORT_KNET &&
                    totem_config->interfaces[i].knet_link_priority != 1) {
                        error_reason = "Can only set link priority on knet transport type";
                        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 == TOTEM_TRANSPORT_UDP) {
                        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 (totemip_is_mcast (&totem_config->interfaces[i].mcast_addr) != 0) {
                                error_reason = "mcastaddr is not a correct multicast address.";
                                goto parse_error;
                        }
                }
                /* Verify that all nodes on the same knet link have the same IP family */
                for (j=1; j<totem_config->interfaces[i].member_count; j++) {
                        if (totem_config->interfaces[i].configured) {
                                if (totem_config->interfaces[i].member_list[j].family !=
                                    totem_config->interfaces[i].member_list[0].family) {
                                        snprintf (local_error_reason, sizeof(local_error_reason),
                                                  "Nodes for link %d have different IP families", i);
                                        goto parse_error;
                                }
                        }
                }
        }

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

        if (totem_volatile_config_validate(totem_config, error_string) == -1) {
                return (-1);
        }

        if (check_for_duplicate_nodeids(totem_config, error_string) == -1) {
                return (-1);
        }

        /*
         * KNET Link values validation
         */
        if (strcmp (totem_config->link_mode, "active") &&
                strcmp (totem_config->link_mode, "rr") &&
                strcmp (totem_config->link_mode, "passive")) {
                snprintf (local_error_reason, sizeof(local_error_reason),
                        "The Knet link mode \"%s\" specified is invalid.  It must be active, passive or rr.\n", totem_config->link_mode);
                goto parse_error;
        }

        /* Only Knet does multiple interfaces */
        if (totem_config->transport_number != TOTEM_TRANSPORT_KNET) {
                interface_max = 1;
        }

        if (interface_max < num_configured) {
                snprintf (parse_error, sizeof(parse_error),
                          "%d is too many configured interfaces for non-Knet transport.",
                          num_configured);
                error_reason = parse_error;
                goto parse_error;
        }

        /* Only knet allows crypto */
        if (totem_config->transport_number != TOTEM_TRANSPORT_KNET) {
                if ((strcmp(totem_config->crypto_cipher_type, "none") != 0) ||
                    (strcmp(totem_config->crypto_hash_type, "none") != 0)) {

                        snprintf (parse_error, sizeof(parse_error),
                                  "crypto_cipher & crypto_hash are only valid for the Knet transport.");
                        error_reason = parse_error;
                        goto parse_error;
                }
        }

        if (totem_config->net_mtu == 0) {
                if (totem_config->transport_number == TOTEM_TRANSPORT_KNET) {
                        totem_config->net_mtu = KNET_MAX_PACKET_SIZE;
                }
                else {
                        totem_config->net_mtu = 1500;
                }
        }

        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;
        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, TOTEM_PRIVATE_KEY_LEN_MAX);
        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;
        }

        if (res < TOTEM_PRIVATE_KEY_LEN_MIN) {
                snprintf (error_string_response, sizeof(error_string_response),
                        "Could only read %d bits of minimum %u bits from %s.\n",
                         res * 8, TOTEM_PRIVATE_KEY_LEN_MIN * 8, key_location);
                goto parse_error;
        }

        totem_config->private_key_len = res;

        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, sizeof(totem_config->private_key));
        totem_config->private_key_len = 0;

        if (strcmp(totem_config->crypto_cipher_type, "none") == 0 &&
            strcmp(totem_config->crypto_hash_type, "none") == 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 (key_len < TOTEM_PRIVATE_KEY_LEN_MIN) {
                                sprintf(error_string_response, "key is too short");
                                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 load 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 debug_dump_totem_config(const struct totem_config *totem_config)
{

        log_printf(LOGSYS_LEVEL_DEBUG, "Token Timeout (%d ms) retransmit timeout (%d ms)",
            totem_config->token_timeout, totem_config->token_retransmit_timeout);
        log_printf(LOGSYS_LEVEL_DEBUG, "token hold (%d ms) retransmits before loss (%d retrans)",
            totem_config->token_hold_timeout, totem_config->token_retransmits_before_loss_const);
        log_printf(LOGSYS_LEVEL_DEBUG, "join (%d ms) send_join (%d ms) consensus (%d ms) merge (%d ms)",
            totem_config->join_timeout, totem_config->send_join_timeout, totem_config->consensus_timeout,
            totem_config->merge_timeout);
        log_printf(LOGSYS_LEVEL_DEBUG, "downcheck (%d ms) fail to recv const (%d msgs)",
            totem_config->downcheck_timeout, totem_config->fail_to_recv_const);
        log_printf(LOGSYS_LEVEL_DEBUG,
            "seqno unchanged const (%d rotations) Maximum network MTU %d",
            totem_config->seqno_unchanged_const, totem_config->net_mtu);
        log_printf(LOGSYS_LEVEL_DEBUG,
            "window size per rotation (%d messages) maximum messages per rotation (%d messages)",
            totem_config->window_size, totem_config->max_messages);
        log_printf(LOGSYS_LEVEL_DEBUG, "missed count const (%d messages)", totem_config->miss_count_const);
        log_printf(LOGSYS_LEVEL_DEBUG, "heartbeat_failures_allowed (%d)",
            totem_config->heartbeat_failures_allowed);
        log_printf(LOGSYS_LEVEL_DEBUG, "max_network_delay (%d ms)", totem_config->max_network_delay);
}

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)
{
        struct totem_config *totem_config = (struct totem_config *)user_data;
        uint32_t *param;
        uint8_t reloading;
        const char *deleted_key = NULL;
        const char *error_string;

        /*
         * If a full reload is in progress then don't do anything until it's done and
         * can reconfigure it all atomically
         */
        if (icmap_get_uint8("config.reload_in_progress", &reloading) == CS_OK && reloading)
                return;

        param = totem_get_param_by_name((struct totem_config *)user_data, key_name);
        /*
         * Process change only if changed key is found in totem_config (-> param is not NULL)
         * or for special key token_coefficient. token_coefficient key is not stored in
         * totem_config, but it is used for computation of token timeout.
         */
        if (!param && strcmp(key_name, "totem.token_coefficient") != 0)
                return;

        /*
         * Values other than UINT32 are not supported, or needed (yet)
         */
        switch (event) {
        case ICMAP_TRACK_DELETE:
                deleted_key = key_name;
                break;
        case ICMAP_TRACK_ADD:
        case ICMAP_TRACK_MODIFY:
                deleted_key = NULL;
                break;
        default:
                break;
        }

        totem_volatile_config_read (totem_config, deleted_key);
        log_printf(LOGSYS_LEVEL_DEBUG, "Totem related config key changed. Dumping actual totem config.");
        debug_dump_totem_config(totem_config);
        if (totem_volatile_config_validate(totem_config, &error_string) == -1) {
                log_printf (LOGSYS_LEVEL_ERROR, "%s", error_string);
                /*
                 * TODO: Consider corosync exit and/or load defaults for volatile
                 * values. For now, log error seems to be enough
                 */
        }
}

static void totem_reload_notify(
        int32_t event,
        const char *key_name,
        struct icmap_notify_value new_val,
        struct icmap_notify_value old_val,
        void *user_data)
{
        struct totem_config *totem_config = (struct totem_config *)user_data;
        const char *error_string;
        uint64_t warnings;

        /* Reload has completed */
        if (*(uint8_t *)new_val.data == 0) {

                totem_config->orig_interfaces = malloc (sizeof (struct totem_interface) * INTERFACE_MAX);
                assert(totem_config->orig_interfaces != NULL);
                memcpy(totem_config->orig_interfaces, totem_config->interfaces, sizeof (struct totem_interface) * INTERFACE_MAX);

                get_interface_params(totem_config, &error_string, &warnings, 1);
                put_nodelist_members_to_config (totem_config, 1);
                totem_volatile_config_read (totem_config, NULL);

                calc_knet_ping_timers(totem_config);

                log_printf(LOGSYS_LEVEL_DEBUG, "Configuration reloaded. Dumping actual totem config.");
                debug_dump_totem_config(totem_config);
                if (totem_volatile_config_validate(totem_config, &error_string) == -1) {
                        log_printf (LOGSYS_LEVEL_ERROR, "%s", error_string);
                        /*
                         * TODO: Consider corosync exit and/or load defaults for volatile
                         * values. For now, log error seems to be enough
                         */
                }

                /* Reinstate the local_node_pos */
                (void)find_local_node(0);

                /* Reconfigure network params as appropriate */
                totempg_reconfigure();

                free(totem_config->orig_interfaces);

                icmap_set_uint8("config.totemconfig_reload_in_progress", 0);
        } else {
                icmap_set_uint8("config.totemconfig_reload_in_progress", 1);
        }
}

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);

        icmap_track_add("config.reload_in_progress",
                ICMAP_TRACK_ADD | ICMAP_TRACK_MODIFY,
                totem_reload_notify,
                totem_config,
                &icmap_track);

        icmap_track_add("nodelist.node.",
                ICMAP_TRACK_ADD | ICMAP_TRACK_DELETE | ICMAP_TRACK_MODIFY | ICMAP_TRACK_PREFIX,
                nodelist_dynamic_notify,
                (void *)totem_config,
                &icmap_track);
}