ul_mod.c

/*
 * Usrloc module interface
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of opensips, a free SIP server.
 *
 * opensips is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * opensips is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 *
 * History:
 * ---------
 * 2003-01-27 timer activity printing #ifdef-ed to EXTRA_DEBUG (jiri)
 * 2003-03-11 New module interface (janakj)
 * 2003-03-12 added replication and state columns (nils)
 * 2003-03-16 flags export parameter added (janakj)
 * 2003-04-05: default_uri #define used (jiri)
 * 2003-04-21 failed fifo init stops init process (jiri)
 * 2004-03-17 generic callbacks added (bogdan)
 * 2004-06-07 updated to the new DB api (andrei)
 */

/*! \file
 *  \brief USRLOC - Usrloc module interface
 *  \ingroup usrloc
 */

/*! \defgroup usrloc User location module
	\brief The module keeps a user location table
   	and provides access to the table to other modules. The module
   	exports no functions that could be used directly from scripts.
 */

#include <stdio.h>
#include "../../sr_module.h"
#include "ul_mod.h"
#include "../../rw_locking.h"
#include "../../dprint.h"
#include "../../timer.h"     /* register_timer */
#include "../../globals.h"   /* is_main */
#include "../../ut.h"        /* str_init */
#include "../../ipc.h"
#include "dlist.h"           /* register_udomain */
#include "udomain.h"         /* {insert,delete,get,release}_urecord */
#include "urecord.h"         /* {insert,delete,get}_ucontact */
#include "ucontact.h"        /* update_ucontact */
#include "ureplication.h"
#include "ul_mi.h"
#include "ul_callback.h"
#include "usrloc.h"


#define CONTACTID_COL  "contact_id"
#define USER_COL       "username"
#define DOMAIN_COL     "domain"
#define CONTACT_COL    "contact"
#define RECEIVED_COL   "received"
#define PATH_COL       "path"
#define EXPIRES_COL    "expires"
#define Q_COL          "q"
#define CALLID_COL     "callid"
#define CSEQ_COL       "cseq"
#define LAST_MOD_COL   "last_modified"
#define FLAGS_COL      "flags"
#define CFLAGS_COL     "cflags"
#define USER_AGENT_COL "user_agent"
#define SOCK_COL       "socket"
#define METHODS_COL    "methods"
#define SIP_INSTANCE_COL   "sip_instance"
#define KV_STORE_COL   "kv_store"
#define ATTR_COL       "attr"

static int mod_init(void);        /*!< Module initialization */
static void destroy(void);        /*!< Module destroy */
static void update_db_state(unsigned int ticks, void* param); /*!< Timer */
static int child_init(int rank);  /*!< Per-child init function */
static int mi_child_init(void);
int check_runtime_config(void);

//static int add_replication_dest(modparam_t type, void *val);

extern int bind_usrloc(usrloc_api_t* api);
extern int ul_locks_no;
extern rw_lock_t *sync_lock;

/* Skip all DB operations when receiving replicated data */
int skip_replicated_db_ops;

int max_contact_delete=10;
db_key_t *cid_keys=NULL;
db_val_t *cid_vals=NULL;

int cid_regen=0;



/*
 * Module parameters and their default values
 */

str user_col        = str_init(USER_COL); 		/*!< Name of column containing usernames */
str domain_col      = str_init(DOMAIN_COL); 		/*!< Name of column containing domains */
str contact_col     = str_init(CONTACT_COL);		/*!< Name of column containing contact addresses */
str expires_col     = str_init(EXPIRES_COL);		/*!< Name of column containing expires values */
str q_col           = str_init(Q_COL);			/*!< Name of column containing q values */
str callid_col      = str_init(CALLID_COL);		/*!< Name of column containing callid string */
str cseq_col        = str_init(CSEQ_COL);		/*!< Name of column containing cseq values */
str flags_col       = str_init(FLAGS_COL);		/*!< Name of column containing internal flags */
str cflags_col      = str_init(CFLAGS_COL);		/*!< Name of column containing contact flags */
str user_agent_col  = str_init(USER_AGENT_COL);		/*!< Name of column containing user agent string */
str received_col    = str_init(RECEIVED_COL);		/*!< Name of column containing transport info of REGISTER */
str path_col        = str_init(PATH_COL);		/*!< Name of column containing the Path header */
str sock_col        = str_init(SOCK_COL);		/*!< Name of column containing the received socket */
str methods_col     = str_init(METHODS_COL);		/*!< Name of column containing the supported methods */
str last_mod_col    = str_init(LAST_MOD_COL);		/*!< Name of column containing the last modified date */
str kv_store_col    = str_init(KV_STORE_COL);		/*!< Name of column containing generic key-value data */
str attr_col        = str_init(ATTR_COL);		/*!< Name of column containing additional info */
str sip_instance_col = str_init(SIP_INSTANCE_COL);
str contactid_col   = str_init(CONTACTID_COL);

str db_url          = STR_NULL;					/*!< Database URL */
str cdb_url         = STR_NULL;					/*!< Cache Database URL */
int timer_interval  = 60;              /*!< Timer interval in seconds */
enum usrloc_modes db_mode = NOT_SET;   /*!< XXX: DEPRECATED: DB sync scheme */
char *runtime_preset;

/*!< Clustering scheme */
enum ul_cluster_mode cluster_mode = CM_NONE;
char *cluster_mode_str;

/*!< Restart persistency */
enum ul_rr_persist rr_persist = RRP_NONE;
char *rr_persist_str;

/*!< SQL write mode */
enum ul_sql_write_mode sql_wmode = SQL_NO_WRITE;
char *sql_wmode_str;

int use_domain      = 0;   /*!< Whether usrloc should use domain part of aor */
int desc_time_order = 0;   /*!< By default do not enable timestamp ordering */

int ul_hash_size = 9;

/* flag */
unsigned int nat_bflag = (unsigned int)-1;
static char *nat_bflag_str = 0;
unsigned int init_flag = 0;

/**
 * A global SIP user location cluster. It must include all
 * OpenSIPS user location nodes, regardless whether some of them form
 * virtual IP pairs or not. Depending on the @cluster_mode, the behavior
 * of the current node with regards to the @location_cluster may shift.
 *
 * For example, we may either:
 *   - fully broadcast contact updates to all nodes
 *   - broadcast contact updates to local nodes only
 *   - not directly broadcast any contact data at all
 *       (although it gets published into a global NoSQL cluster)
 */
int location_cluster;

db_con_t* ul_dbh = 0; /* Database connection handle */
db_func_t ul_dbf;

cachedb_funcs cdbf;
cachedb_con *cdbc;

int mi_dump_kv_store;
int latency_event_min_us_delta;
int latency_event_min_us;

/*! \brief
 * Exported functions
 */
static cmd_export_t cmds[] = {
	{"ul_bind_usrloc",        (cmd_function)bind_usrloc,        1, 0, 0, 0},
	{0, 0, 0, 0, 0, 0}
};


/*! \brief
 * Exported parameters
 */
static param_export_t params[] = {
	{"contact_id_column",   STR_PARAM,&contactid_col.s   },
	{"user_column",        STR_PARAM, &user_col.s        },
	{"domain_column",      STR_PARAM, &domain_col.s      },
	{"contact_column",     STR_PARAM, &contact_col.s     },
	{"expires_column",     STR_PARAM, &expires_col.s     },
	{"q_column",           STR_PARAM, &q_col.s           },
	{"callid_column",      STR_PARAM, &callid_col.s      },
	{"cseq_column",        STR_PARAM, &cseq_col.s        },
	{"flags_column",       STR_PARAM, &flags_col.s       },
	{"cflags_column",      STR_PARAM, &cflags_col.s      },
	{"db_url",             STR_PARAM, &db_url.s          },
	{"cachedb_url",        STR_PARAM, &cdb_url.s         },
	{"timer_interval",     INT_PARAM, &timer_interval    },

	/* runtime behavior selection */
	{"db_mode",            INT_PARAM, &db_mode           }, /* bw-compat */
	{"working_mode_preset",STR_PARAM, &runtime_preset    },
	{"cluster_mode",       STR_PARAM, &cluster_mode_str  },
	{"restart_persistency",STR_PARAM, &rr_persist_str    },
	{"sql_write_mode",     STR_PARAM, &sql_wmode_str     },

	{"use_domain",         INT_PARAM, &use_domain        },
	{"desc_time_order",    INT_PARAM, &desc_time_order   },
	{"user_agent_column",  STR_PARAM, &user_agent_col.s  },
	{"received_column",    STR_PARAM, &received_col.s    },
	{"path_column",        STR_PARAM, &path_col.s        },
	{"socket_column",      STR_PARAM, &sock_col.s        },
	{"methods_column",     STR_PARAM, &methods_col.s     },
	{"sip_instance_column",STR_PARAM, &sip_instance_col.s},
	{"kv_store_column",    STR_PARAM, &kv_store_col.s    },
	{"mi_dump_kv_store",   INT_PARAM, &mi_dump_kv_store  },
	{"latency_event_min_us",   INT_PARAM, &latency_event_min_us  },
	{"latency_event_min_us_delta",   INT_PARAM, &latency_event_min_us_delta  },
	{"attr_column",        STR_PARAM, &attr_col.s        },
	{"matching_mode",      INT_PARAM, &matching_mode     },
	{"cseq_delay",         INT_PARAM, &cseq_delay        },
	{"hash_size",          INT_PARAM, &ul_hash_size      },
	{"nat_bflag",          STR_PARAM, &nat_bflag_str     },
	{"nat_bflag",          INT_PARAM, &nat_bflag         },
    /* data replication through clusterer using TCP binary packets */
	{ "location_cluster",	INT_PARAM, &location_cluster   },
	{ "skip_replicated_db_ops", INT_PARAM, &skip_replicated_db_ops   },
	{ "max_contact_delete", INT_PARAM, &max_contact_delete },
	{ "regen_broken_contactid", INT_PARAM, &cid_regen},
	{0, 0, 0}
};


static stat_export_t mod_stats[] = {
	{"registered_users" ,  STAT_IS_FUNC, (stat_var**)get_number_of_users  },
	{0,0,0}
};


static mi_export_t mi_cmds[] = {
	{ MI_USRLOC_RM,           0, mi_usrloc_rm_aor,       0,                 0,
				mi_child_init },
	{ MI_USRLOC_RM_CONTACT,   0, mi_usrloc_rm_contact,   0,                 0,
				mi_child_init },
	{ MI_USRLOC_DUMP,         0, mi_usrloc_dump,         0,                 0,
				0             },
	{ MI_USRLOC_FLUSH,        0, mi_usrloc_flush,        MI_NO_INPUT_FLAG,  0,
				mi_child_init },
	{ MI_USRLOC_ADD,          0, mi_usrloc_add,          0,                 0,
				mi_child_init },
	{ MI_USRLOC_SHOW_CONTACT, 0, mi_usrloc_show_contact, 0,                 0,
				mi_child_init },
	{ MI_USRLOC_SYNC,         0, mi_usrloc_sync,         0,                 0,
				mi_child_init },
	{ MI_USRLOC_CL_SYNC,      0, mi_usrloc_cl_sync,      MI_NO_INPUT_FLAG,  0,
				mi_child_init },
	{ 0, 0, 0, 0, 0, 0}
};

static module_dependency_t *get_deps_db_mode(param_export_t *param)
{
	if (*(int *)param->param_pointer <= NO_DB)
		return NULL;

	return alloc_module_dep(MOD_TYPE_SQLDB, NULL, DEP_ABORT);
}

static module_dependency_t *get_deps_wmode_preset(param_export_t *param)
{
	char *haystack = (char *)param->param_pointer;

	if (l_memmem(haystack, "sql-", strlen(haystack), strlen("sql-")))
		return alloc_module_dep(MOD_TYPE_SQLDB, NULL, DEP_ABORT);

	if (l_memmem(haystack, "cachedb", strlen(haystack), strlen("cachedb")))
		return alloc_module_dep(MOD_TYPE_CACHEDB, NULL, DEP_ABORT);

	return NULL;
}

static module_dependency_t *get_deps_rr_persist(param_export_t *param)
{
	if (!strcasecmp((char *)param->param_pointer, "load-from-sql"))
		return alloc_module_dep(MOD_TYPE_SQLDB, NULL, DEP_ABORT);

	return NULL;
}

static dep_export_t deps = {
	{ /* OpenSIPS module dependencies */
		{ MOD_TYPE_NULL, NULL, 0 },
	},
	{ /* modparam dependencies */
		{"db_mode", get_deps_db_mode},
		{"cachedb_url", get_deps_cachedb_url},
		{"working_mode_preset", get_deps_wmode_preset},
		{"cluster_mode", get_deps_wmode_preset},
		{"restart_persistency", get_deps_rr_persist},
		{"location_cluster", get_deps_clusterer},
		{NULL, NULL},
	},
};

struct module_exports exports = {
	"usrloc",
	MOD_TYPE_DEFAULT,/*!< class of this module */
	MODULE_VERSION,
	DEFAULT_DLFLAGS, /*!< dlopen flags */
	&deps,           /*!< OpenSIPS module dependencies */
	cmds,       /*!< Exported functions */
	0,          /*!< Exported async functions */
	params,     /*!< Export parameters */
	mod_stats,  /*!< exported statistics */
	mi_cmds,    /*!< exported MI functions */
	0,          /*!< exported pseudo-variables */
	0,          /*!< exported transformations */
	0,          /*!< extra processes */
	mod_init,   /*!< Module initialization function */
	0,          /*!< Response function */
	destroy,    /*!< Destroy function */
	child_init  /*!< Child initialization function */
};


/*! \brief
 * Module initialization function
 */
static int mod_init(void)
{
	int idx;

	LM_DBG("initializing\n");

	/* Compute the lengths of string parameters */
	init_db_url( db_url , 1 /*can be null*/);
	contactid_col.len = strlen(contactid_col.s);
	user_col.len = strlen(user_col.s);
	domain_col.len = strlen(domain_col.s);
	contact_col.len = strlen(contact_col.s);
	expires_col.len = strlen(expires_col.s);
	q_col.len = strlen(q_col.s);
	callid_col.len = strlen(callid_col.s);
	cseq_col.len = strlen(cseq_col.s);
	flags_col.len = strlen(flags_col.s);
	cflags_col.len = strlen(cflags_col.s);
	user_agent_col.len = strlen(user_agent_col.s);
	received_col.len = strlen(received_col.s);
	path_col.len = strlen(path_col.s);
	sock_col.len = strlen(sock_col.s);
	methods_col.len = strlen(methods_col.s);
	sip_instance_col.len = strlen(sip_instance_col.s);
	kv_store_col.len = strlen(kv_store_col.s);
	attr_col.len = strlen(attr_col.s);
	last_mod_col.len = strlen(last_mod_col.s);

	if (ul_hash_size > 16) {
		LM_WARN("hash too big! max 2 ^ 16\n");
		return -1;
	}

	if(ul_hash_size<=1)
		ul_hash_size = 512;
	else
		ul_hash_size = 1<<ul_hash_size;
	ul_locks_no = ul_hash_size;

	if (check_runtime_config() != 0) {
		LM_ERR("bad runtime config - exiting...\n");
		return -1;
	}

	if (have_cdb_conns()) {
		cdb_url.len = strlen(cdb_url.s);

		if (cachedb_bind_mod(&cdb_url, &cdbf) < 0) {
			LM_ERR("cannot bind functions for cachedb_url %.*s\n",
			       cdb_url.len, cdb_url.s);
			return -1;
		}

		if (!CACHEDB_CAPABILITY(&cdbf, CACHEDB_CAP_COL_ORIENTED)) {
			LM_ERR("not enough capabilities for cachedb_url %.*s\n",
			       cdb_url.len, cdb_url.s);
			return -1;
		}
	}

	if (cluster_mode != CM_NONE || rr_persist == RRP_LOAD_FROM_SQL) {
		cid_keys = pkg_malloc(max_contact_delete *
				(sizeof(db_key_t) * sizeof(db_val_t)));
		if (cid_keys == NULL) {
			LM_ERR("no more pkg memory\n");
			return -1;
		}

		cid_vals = (db_val_t *)(cid_keys + max_contact_delete);
		for (idx=0; idx < max_contact_delete; idx++) {
			VAL_TYPE(cid_vals+idx) = DB_BIGINT;
			VAL_NULL(cid_vals+idx) = 0;
			cid_keys[idx] = &contactid_col;
		}
	}

	/* check matching mode */
	switch (matching_mode) {
		case CONTACT_ONLY:
		case CONTACT_CALLID:
			break;
		default:
			LM_ERR("invalid matching mode %d\n", matching_mode);
	}

	if(ul_init_locks()!=0)
	{
		LM_ERR("locks array initialization failed\n");
		return -1;
	}

	/* Register cache timer */
	register_timer( "ul-timer", update_db_state, 0, timer_interval,
		TIMER_FLAG_DELAY_ON_DELAY);

	/* init the callbacks list */
	if ( init_ulcb_list() < 0) {
		LM_ERR("usrloc/callbacks initialization failed\n");
		return -1;
	}

	/* use database if needed */
	if (cluster_mode == CM_SQL_ONLY || rr_persist == RRP_LOAD_FROM_SQL) {
		if (db_url.s==NULL || db_url.len==0) {
			LM_ERR("selected mode requires a db connection -> db_url \n");
			return -1;
		}
		if (db_bind_mod(&db_url, &ul_dbf) < 0) { /* Find database module */
			LM_ERR("failed to bind database module\n");
			return -1;
		}
		if (!DB_CAPABILITY(ul_dbf, DB_CAP_ALL)) {
			LM_ERR("database module does not implement all functions"
					" needed by the module\n");
			return -1;
		}
		if (rr_persist == RRP_LOAD_FROM_SQL) {
			if (!(sync_lock = lock_init_rw())) {
				LM_ERR("cannot init rw lock\n");
				return -1;
			}
		}
	}

	fix_flag_name(nat_bflag_str, nat_bflag);

	nat_bflag = get_flag_id_by_name(FLAG_TYPE_BRANCH, nat_bflag_str);

	if (nat_bflag==(unsigned int)-1) {
		nat_bflag = 0;
	} else if ( nat_bflag>=8*sizeof(nat_bflag) ) {
		LM_ERR("bflag index (%d) too big!\n", nat_bflag);
		return -1;
	} else {
		nat_bflag = 1<<nat_bflag;
	}

	if (ul_event_init() < 0) {
		LM_ERR("cannot initialize USRLOC events\n");
		return -1;
	}

	if (location_cluster < 0) {
		LM_ERR("Invalid cluster id to replicate contacts to, must be 0 or "
			"a positive number\n");
		return -1;
	}

	if (location_cluster) {
		if (load_clusterer_api(&clusterer_api) != 0) {
			LM_DBG("failed to find clusterer API - is clusterer module loaded?\n");
			return -1;
		}

		/* register handler for processing usrloc packets to the clusterer module */
		if (clusterer_api.register_capability(&contact_repl_cap,
			receive_binary_packets, receive_cluster_event, location_cluster,
			rr_persist == RRP_SYNC_FROM_CLUSTER? 1 : 0,
			(cluster_mode == CM_FEDERATION
			 || cluster_mode == CM_FEDERATION_CACHEDB) ?
				NODE_CMP_EQ_SIP_ADDR : NODE_CMP_ANY) < 0) {
			LM_ERR("cannot register callbacks to clusterer module!\n");
			return -1;
		}

		if (rr_persist == RRP_SYNC_FROM_CLUSTER &&
		    clusterer_api.request_sync(&contact_repl_cap, location_cluster, 0) < 0)
			LM_ERR("Sync request failed\n");
	}

	init_flag = 1;

	return 0;
}


static void ul_rpc_data_load(int sender_id, void *unsused)
{
	dlist_t* ptr;

	for( ptr=root ; ptr ; ptr=ptr->next) {
		if (preload_udomain(ul_dbh, ptr->d) < 0) {
			LM_ERR("failed to preload domain '%.*s'\n",
				ptr->name.len, ZSW(ptr->name.s));
			/* continue with the other ul domains */;
		}
	}
}

int init_cachedb(void)
{
	if (!cdbf.init) {
		LM_ERR("cachedb functions not initialized\n");
		return -1;
	}

	cdbc = cdbf.init(&cdb_url);
	if (!cdbc) {
		LM_ERR("cannot connect to cachedb_url %.*s\n", cdb_url.len, cdb_url.s);
		return -1;
	}

	LM_DBG("Init'ed cachedb\n");
	return 0;
}

static int child_init(int _rank)
{
	if (have_cdb_conns() && init_cachedb() < 0) {
	    LM_ERR("cannot init cachedb feature\n");
	    return -1;
	}

	if (!have_db_conns())
		return 0;

	/* we need connection from SIP workers, BIN and MAIN procs */
	if (_rank < PROC_MAIN && _rank != PROC_BIN )
		return 0;

	ul_dbh = ul_dbf.init(&db_url); /* Get a new database connection */
	if (!ul_dbh) {
		LM_ERR("child(%d): failed to connect to database\n", _rank);
		return -1;
	}
	/* _rank==1 is used even when fork is disabled */
	if (_rank==1 && rr_persist == RRP_LOAD_FROM_SQL) {
		/* if cache is used, populate domains from DB */
		if (ipc_send_rpc( process_no, ul_rpc_data_load, NULL)<0) {
			LM_ERR("failed to fire RPC for data load\n");
			return -1;
		}
	}

	return 0;
}


/* */
static int mi_child_init(void)
{
	static int done = 0;

	if (done)
		return 0;

	if (have_db_conns()) {
		ul_dbh = ul_dbf.init(&db_url);
		if (!ul_dbh) {
			LM_ERR("failed to connect to database\n");
			return -1;
		}
	}
	done = 1;

	return 0;
}


/*! \brief
 * Module destroy function
 */
static void destroy(void)
{
	if (cdbc)
		cdbf.destroy(cdbc);
	cdbc = NULL;

	/* we need to sync DB in order to flush the cache */
	if (ul_dbh) {
		ul_unlock_locks();
		if (sync_lock)
			lock_start_read(sync_lock);
		if (synchronize_all_udomains() != 0) {
			LM_ERR("flushing cache failed\n");
		}
		if (sync_lock) {
			lock_stop_read(sync_lock);
			lock_destroy_rw(sync_lock);
			sync_lock = 0;
		}
		ul_dbf.close(ul_dbh);
	}

	free_all_udomains();
	ul_destroy_locks();

	/* free callbacks list */
	destroy_ulcb_list();
}


/*! \brief
 * Timer handler
 */
static void update_db_state(unsigned int ticks, void* param)
{
	if (sync_lock)
		lock_start_read(sync_lock);
	if (synchronize_all_udomains() != 0) {
		LM_ERR("synchronizing cache failed\n");
	}
	if (sync_lock)
		lock_stop_read(sync_lock);
}

int check_runtime_config(void)
{
	if (db_mode >= NO_DB && db_mode <= DB_ONLY) {
		if (runtime_preset) {
			LM_ERR("both 'db_mode' and 'working_mode_preset' are present "
			       "-- please pick one!\n");
			return -1;
		}

		LM_WARN("'db_mode' is now deprecated, use 'working_mode_preset'!\n");

		switch (db_mode) {
		case NOT_SET:
		case NO_DB:
			runtime_preset = "single-instance-no-db";
			break;
		case WRITE_THROUGH:
			runtime_preset = "single-instance-sql-write-through";
			break;
		case WRITE_BACK:
			runtime_preset = "single-instance-sql-write-back";
			break;
		case DB_ONLY:
			runtime_preset = "sql-only";
			break;
		}
	} else if (db_mode != NOT_SET) {
		LM_WARN("ignoring unknown db_mode: %d\n", db_mode);
	}

	if (runtime_preset) {
		if (!strcasecmp(runtime_preset, "single-instance-no-db")) {
			cluster_mode = CM_NONE;
			rr_persist = RRP_NONE;
			sql_wmode = SQL_NO_WRITE;
		} else if (!strcasecmp(runtime_preset,
		           "single-instance-sql-write-through")) {
			cluster_mode = CM_NONE;
			rr_persist = RRP_LOAD_FROM_SQL;
			sql_wmode = SQL_WRITE_THROUGH;
		} else if (!strcasecmp(runtime_preset,
		           "single-instance-sql-write-back")) {
			cluster_mode = CM_NONE;
			rr_persist = RRP_LOAD_FROM_SQL;
			sql_wmode = SQL_WRITE_BACK;
		} else if (!strcasecmp(runtime_preset, "federation-cluster")) {
			cluster_mode = CM_FEDERATION;
			rr_persist = RRP_SYNC_FROM_CLUSTER;
			sql_wmode = SQL_NO_WRITE;
		} else if (!strcasecmp(runtime_preset, "federation-cachedb-cluster")) {
			cluster_mode = CM_FEDERATION_CACHEDB;
			rr_persist = RRP_SYNC_FROM_CLUSTER;
			sql_wmode = SQL_NO_WRITE;
		} else if (!strcasecmp(runtime_preset, "full-sharing-cluster")) {
			cluster_mode = CM_FULL_SHARING;
			rr_persist = RRP_SYNC_FROM_CLUSTER;
			sql_wmode = SQL_NO_WRITE;
		} else if (!strcasecmp(runtime_preset, "full-sharing-cachedb-cluster")) {
			cluster_mode = CM_FULL_SHARING_CACHEDB;
			rr_persist = RRP_NONE;
			sql_wmode = SQL_NO_WRITE;
		/* TODO: update CM_SQL_ONLY to work in clusterized environments
		} else if (!strcasecmp(runtime_preset, "full-sharing-sql-cluster")) {
			cluster_mode = CM_SQL_ONLY;
			rr_persist = RRP_NONE;
			sql_wmode = SQL_NO_WRITE;*/
		} else {
			LM_ERR("unrecognized preset: %s, defaulting to "
			       "'single-instance-no-db'\n", runtime_preset);
			cluster_mode = CM_NONE;
			rr_persist = RRP_NONE;
			sql_wmode = SQL_NO_WRITE;
		}
	} else {
		if (cluster_mode_str) {
			if (!strcasecmp(cluster_mode_str, "none"))
				cluster_mode = CM_NONE;
			else if (!strcasecmp(cluster_mode_str, "federation"))
				cluster_mode = CM_FEDERATION;
			else if (!strcasecmp(cluster_mode_str, "federation-cachedb"))
				cluster_mode = CM_FEDERATION_CACHEDB;
			else if (!strcasecmp(cluster_mode_str, "full-sharing"))
				cluster_mode = CM_FULL_SHARING;
			else if (!strcasecmp(cluster_mode_str, "full-sharing-cachedb"))
				cluster_mode = CM_FULL_SHARING_CACHEDB;
			/* TODO: same as above
			else if (!strcasecmp(cluster_mode_str, "full-sharing-sql"))
				cluster_mode = CM_SQL_ONLY;*/
			else
				LM_ERR("unknown 'cluster_mode' value: %s, using 'none'\n",
				       cluster_mode_str);
		}

		if (rr_persist_str) {
			if (!strcasecmp(rr_persist_str, "none"))
				rr_persist = RRP_NONE;
			else if (!strcasecmp(rr_persist_str, "load-from-sql"))
				rr_persist = RRP_LOAD_FROM_SQL;
			else if (!strcasecmp(rr_persist_str, "sync-from-cluster"))
				rr_persist = RRP_SYNC_FROM_CLUSTER;
			else
				LM_ERR("unknown 'restart_persistency' value: %s, "
				       "using 'none'\n", rr_persist_str);
		}

		if (sql_wmode_str) {
			if (!strcasecmp(sql_wmode_str, "none"))
				sql_wmode = SQL_NO_WRITE;
			else if (!strcasecmp(sql_wmode_str, "write-through"))
				sql_wmode = SQL_WRITE_THROUGH;
			else if (!strcasecmp(sql_wmode_str, "write-back"))
				sql_wmode = SQL_WRITE_BACK;
			else
				LM_ERR("unknown 'sql_write_mode' value: %s\n", sql_wmode_str);
		}
	}

	if (bad_cluster_mode(cluster_mode)) {
		LM_ERR("bad cluster mode (%d) - select one from the docs\n",
		       cluster_mode);
		return -1;
	}

	if (bad_rr_persist(rr_persist)) {
		LM_ERR("bad restart persistency (%d) - select one from the docs\n",
		       rr_persist);
		return -1;
	}

	if (bad_sql_write_mode(sql_wmode)) {
		LM_ERR("bad sql write mode (%d) - select one from the docs\n",
		       sql_wmode);
		return -1;
	}

	if (rr_persist != RRP_LOAD_FROM_SQL && sql_wmode != SQL_NO_WRITE) {
		LM_WARN("the 'sql_write_mode' only makes sense with an "
		        "SQL-based restart persistency -- ignoring...\n");
		sql_wmode = SQL_NO_WRITE;
	} else if (rr_persist == RRP_LOAD_FROM_SQL && sql_wmode == SQL_NO_WRITE) {
		LM_WARN("using SQL restart persistency without an 'sql_write_mode' "
		        "- defaulting to 'write-back'...\n");
		sql_wmode = SQL_WRITE_BACK;
	}

	switch (cluster_mode) {
	case CM_NONE:
		if (rr_persist == RRP_SYNC_FROM_CLUSTER) {
			LM_ERR("cannot sync from cluster without first "
			       "enabling a clustering mode!\n");
			return -1;
		}

		if (location_cluster) {
			LM_WARN("a 'location_cluster' has been defined with "
			        "a single-instance clustering mode! ignoring...\n");

			location_cluster = 0;
		}
		break;

	case CM_FEDERATION:
		LM_ERR("usrloc 'federation' clustering not implemented yet! :(\n");
		return -1;

	case CM_FEDERATION_CACHEDB:
		if (!use_domain) {
			LM_ERR("usrloc 'federation-cachedb' clustering only works with "
			       "'use_domain = 1'\n");
			return -1;
		}

		if (!location_cluster) {
			LM_ERR("'location_cluster' is not set!\n");
			return -1;
		}

		if (!cdb_url.s) {
			LM_ERR("no cache database URL defined! ('cachedb_url')\n");
			return -1;
		}
		break;

	case CM_FULL_SHARING:
		if (!location_cluster) {
			LM_ERR("'location_cluster' is not set!\n");
			return -1;
		}
		break;

	case CM_FULL_SHARING_CACHEDB:
		if (rr_persist != RRP_NONE) {
			LM_WARN("externally managed data is already restart persistent!"
			        " -- auto-disabling 'restart_persistency'\n");
			rr_persist = RRP_NONE;
		}

		if (sql_wmode != SQL_NO_WRITE) {
			LM_WARN("externally managed data is already restart persistent!"
			        " -- auto-disabling 'sql_write_mode'\n");
			sql_wmode = SQL_NO_WRITE;
		}

		if (!location_cluster) {
			LM_ERR("'location_cluster' is not set!\n");
			return -1;
		}

		if (!cdb_url.s) {
			LM_ERR("no cache database URL defined! ('cachedb_url')\n");
			return -1;
		}
		break;

	case CM_SQL_ONLY:
		if (rr_persist != RRP_NONE) {
			LM_WARN("externally managed data is already restart persistent!"
			        " -- auto-disabling 'restart_persistency'\n");
			rr_persist = RRP_NONE;
		}

		if (sql_wmode != SQL_NO_WRITE) {
			LM_WARN("externally managed data is already restart persistent!"
			        " -- auto-disabling 'sql_write_mode'\n");
			sql_wmode = SQL_NO_WRITE;
		}

		if (location_cluster) {
			LM_WARN("a 'location_cluster' has been defined although "
			        "it is not required! ignoring...\n");

			location_cluster = 0;
		}
		break;
	}

	LM_DBG("ul config: db_mode=%d, cluster_mode=%d, rrp=%d, sql_wm=%d\n",
	       db_mode, cluster_mode, rr_persist, sql_wmode);

	return 0;
}