src/db_hlr.c - osmo-hlr - Gitiles

 /* (C) 2015 by Harald Welte <laforge@gnumonks.org>
  *
  * All Rights Reserved
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
  * the Free Software Foundation; either version 3 of the License, or
  * (at your option) any later version.
  *
  * This program 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 Affero General Public License for more details.
  *
  * You should have received a copy of the GNU Affero General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */

 #include <string.h>
 #include <errno.h>
 #include <inttypes.h>

 #include <osmocom/core/utils.h>
 #include <osmocom/crypt/auth.h>
 #include <osmocom/gsm/gsm23003.h>

 #include <sqlite3.h>

 #include "logging.h"
 #include "db.h"

 #define LOGHLR(imsi, level, fmt, args ...)	LOGP(DAUC, level, "IMSI='%s': " fmt, imsi, ## args)

 #define SL3_TXT(x, stmt, idx) 					\
 	do {							\
 		const char *_txt = (const char *) sqlite3_column_text(stmt, idx);\
 		if (_txt)					\
 			strncpy(x, _txt, sizeof(x));		\
 		x[sizeof(x)-1] = '\0';				\
 	} while (0)

 int db_subscr_create(struct db_context *dbc, const char *imsi)
 {
 	sqlite3_stmt *stmt;
 	int rc;

 	if (!osmo_imsi_str_valid(imsi)) {
 		LOGP(DAUC, LOGL_ERROR, "Cannot create subscriber: invalid IMSI: '%s'\n",
 		     imsi);
 		return -EINVAL;
 	}

 	stmt = dbc->stmt[DB_STMT_SUBSCR_CREATE];

 	if (!db_bind_text(stmt, "$imsi", imsi))
 		return -EIO;

 	/* execute the statement */
 	rc = sqlite3_step(stmt);
 	db_remove_reset(stmt);
 	if (rc != SQLITE_DONE) {
 		LOGHLR(imsi, LOGL_ERROR, "Cannot create subscriber: SQL error: (%d) %s\n",
 		       rc, sqlite3_errmsg(dbc->db));
 		return -EIO;
 	}

 	return 0;
 }

 int db_subscr_delete_by_id(struct db_context *dbc, int64_t subscr_id)
 {
 	int rc;
 	int ret = 0;

 	sqlite3_stmt *stmt = dbc->stmt[DB_STMT_DEL_BY_ID];

 	if (!db_bind_int64(stmt, "$subscriber_id", subscr_id))
 		return -EIO;

 	/* execute the statement */
 	rc = sqlite3_step(stmt);
 	if (rc != SQLITE_DONE) {
 		LOGP(DAUC, LOGL_ERROR,
 		       "Cannot delete subscriber ID=%"PRId64": SQL error: (%d) %s\n",
 		       subscr_id, rc, sqlite3_errmsg(dbc->db));
 		db_remove_reset(stmt);
 		return -EIO;
 	}

 	/* verify execution result */
 	rc = sqlite3_changes(dbc->db);
 	if (!rc) {
 		LOGP(DAUC, LOGL_ERROR, "Cannot delete: no such subscriber: ID=%"PRId64"\n",
 		     subscr_id);
 		ret = -ENOENT;
 	} else if (rc != 1) {
 		LOGP(DAUC, LOGL_ERROR, "Delete subscriber ID=%"PRId64
 		     ": SQL modified %d rows (expected 1)\n", subscr_id, rc);
 		ret = -EIO;
 	}

 	/* FIXME: also remove authentication data from auc_2g and auc_3g */

 	db_remove_reset(stmt);
 	return ret;
 }

 int db_subscr_update_msisdn_by_imsi(struct db_context *dbc, const char *imsi,
 				    const char *msisdn)
 {
 	int rc;
 	int ret = 0;

 	if (!osmo_msisdn_str_valid(msisdn)) {
 		LOGHLR(imsi, LOGL_ERROR,
 		       "Cannot update subscriber: invalid MSISDN: '%s'\n",
 		       msisdn);
 		return -EINVAL;
 	}

 	sqlite3_stmt *stmt = dbc->stmt[DB_STMT_SET_MSISDN_BY_IMSI];

 	if (!db_bind_text(stmt, "$imsi", imsi))
 		return -EIO;
 	if (!db_bind_text(stmt, "$msisdn", msisdn))
 		return -EIO;

 	/* execute the statement */
 	rc = sqlite3_step(stmt);
 	if (rc != SQLITE_DONE) {
 		LOGHLR(imsi, LOGL_ERROR,
 		       "Cannot update subscriber's MSISDN: SQL error: (%d) %s\n",
 		       rc, sqlite3_errmsg(dbc->db));
 		ret = -EIO;
 		goto out;
 	}

 	/* verify execution result */
 	rc = sqlite3_changes(dbc->db);
 	if (!rc) {
 		LOGP(DAUC, LOGL_ERROR, "Cannot update MSISDN: no such subscriber: IMSI='%s'\n",
 		     imsi);
 		ret = -ENOENT;
 		goto out;
 	} else if (rc != 1) {
 		LOGHLR(imsi, LOGL_ERROR, "Update MSISDN: SQL modified %d rows (expected 1)\n", rc);
 		ret = -EIO;
 	}

 out:
 	db_remove_reset(stmt);
 	return ret;

 }

 /* Common code for db_subscr_get_by_*() functions. */
 static int db_sel(struct db_context *dbc, sqlite3_stmt *stmt, struct hlr_subscriber *subscr,
 		  const char **err)
 {
 	int rc;
 	int ret = 0;

 	/* execute the statement */
 	rc = sqlite3_step(stmt);
 	if (rc == SQLITE_DONE) {
 		ret = -ENOENT;
 		goto out;
 	}
 	if (rc != SQLITE_ROW) {
 		ret = -EIO;
 		goto out;
 	}

 	if (!subscr)
 		goto out;

 	/* obtain the various columns */
 	subscr->id = sqlite3_column_int64(stmt, 0);
 	SL3_TXT(subscr->imsi, stmt, 1);
 	SL3_TXT(subscr->msisdn, stmt, 2);
 	/* FIXME: These should all be BLOBs as they might contain NUL */
 	SL3_TXT(subscr->vlr_number, stmt, 3);
 	SL3_TXT(subscr->sgsn_number, stmt, 4);
 	SL3_TXT(subscr->sgsn_address, stmt, 5);
 	subscr->periodic_lu_timer = sqlite3_column_int(stmt, 6);
 	subscr->periodic_rau_tau_timer = sqlite3_column_int(stmt, 7);
 	subscr->nam_cs = sqlite3_column_int(stmt, 8);
 	subscr->nam_ps = sqlite3_column_int(stmt, 9);
 	subscr->lmsi = sqlite3_column_int(stmt, 10);
 	subscr->ms_purged_cs = sqlite3_column_int(stmt, 11);
 	subscr->ms_purged_ps = sqlite3_column_int(stmt, 12);

 out:
 	db_remove_reset(stmt);

 	switch (ret) {
 	case 0:
 		*err = NULL;
 		break;
 	case -ENOENT:
 		*err = "No such subscriber";
 		break;
 	default:
 		*err = sqlite3_errmsg(dbc->db);
 		break;
 	}
 	return ret;
 }

 int db_subscr_get_by_imsi(struct db_context *dbc, const char *imsi,
 			  struct hlr_subscriber *subscr)
 {
 	sqlite3_stmt *stmt = dbc->stmt[DB_STMT_SEL_BY_IMSI];
 	const char *err;
 	int rc;

 	if (!db_bind_text(stmt, NULL, imsi))
 		return -EIO;

 	rc = db_sel(dbc, stmt, subscr, &err);
 	if (rc)
 		LOGP(DAUC, LOGL_ERROR, "Cannot read subscriber from db: IMSI='%s': %s\n",
 		     imsi, err);
 	return rc;
 }

 int db_subscr_get_by_msisdn(struct db_context *dbc, const char *msisdn,
 			    struct hlr_subscriber *subscr)
 {
 	sqlite3_stmt *stmt = dbc->stmt[DB_STMT_SEL_BY_MSISDN];
 	const char *err;
 	int rc;

 	if (!db_bind_text(stmt, NULL, msisdn))
 		return -EIO;

 	rc = db_sel(dbc, stmt, subscr, &err);
 	if (rc)
 		LOGP(DAUC, LOGL_ERROR, "Cannot read subscriber from db: MSISDN='%s': %s\n",
 		     msisdn, err);
 	return rc;
 }

 int db_subscr_get_by_id(struct db_context *dbc, int64_t id,
 			struct hlr_subscriber *subscr)
 {
 	sqlite3_stmt *stmt = dbc->stmt[DB_STMT_SEL_BY_ID];
 	const char *err;
 	int rc;

 	if (!db_bind_int64(stmt, NULL, id))
 		return -EIO;

 	rc = db_sel(dbc, stmt, subscr, &err);
 	if (rc)
 		LOGP(DAUC, LOGL_ERROR, "Cannot read subscriber from db: ID=%"PRId64": %s\n",
 		     id, err);
 	return rc;
 }

 /* Enable or disable PS or CS for a subscriber.
  * For the subscriber with the given imsi, set nam_ps (when is_ps == true) or
  * nam_cs (when is_ps == false) to nam_val in the database.
  * Returns 0 on success, -ENOENT when the given IMSI does not exist, -EINVAL if
  * the SQL statement could not be composed, -ENOEXEC if running the SQL
  * statement failed, -EIO if the amount of rows modified is unexpected.
  */
 int db_subscr_nam(struct db_context *dbc, const char *imsi, bool nam_val, bool is_ps)
 {
 	sqlite3_stmt *stmt;
 	int rc;
 	int ret = 0;

 	stmt = dbc->stmt[is_ps ? DB_STMT_UPD_NAM_PS_BY_IMSI
 			       : DB_STMT_UPD_NAM_CS_BY_IMSI];

 	if (!db_bind_text(stmt, "$imsi", imsi))
 		return -EIO;
 	if (!db_bind_int(stmt, "$val", nam_val ? 1 : 0))
 		return -EIO;

 	/* execute the statement */
 	rc = sqlite3_step(stmt);
 	if (rc != SQLITE_DONE) {
 		LOGHLR(imsi, LOGL_ERROR, "%s %s: SQL error: %s\n",
 		       nam_val ? "enable" : "disable",
 		       is_ps ? "PS" : "CS",
 		       sqlite3_errmsg(dbc->db));
 		ret = -EIO;
 		goto out;
 	}

 	/* verify execution result */
 	rc = sqlite3_changes(dbc->db);
 	if (!rc) {
 		LOGP(DAUC, LOGL_ERROR, "Cannot %s %s: no such subscriber: IMSI='%s'\n",
 		     nam_val ? "enable" : "disable",
 		     is_ps ? "PS" : "CS",
 		     imsi);
 		ret = -ENOENT;
 		goto out;
 	} else if (rc != 1) {
 		LOGHLR(imsi, LOGL_ERROR, "%s %s: SQL modified %d rows (expected 1)\n",
 		       nam_val ? "enable" : "disable",
 		       is_ps ? "PS" : "CS",
 		       rc);
 		ret = -EIO;
 	}

 out:
 	db_remove_reset(stmt);
 	return ret;
 }

 int db_subscr_lu(struct db_context *dbc, int64_t subscr_id,
 		 const char *vlr_or_sgsn_number, bool is_ps)
 {
 	sqlite3_stmt *stmt;
 	int rc, ret = 0;

 	stmt = dbc->stmt[is_ps ? DB_STMT_UPD_SGSN_BY_ID
 			       : DB_STMT_UPD_VLR_BY_ID];

 	if (!db_bind_int64(stmt, "$subscriber_id", subscr_id))
 		return -EIO;

 	if (!db_bind_text(stmt, "$number", vlr_or_sgsn_number))
 		return -EIO;

 	/* execute the statement */
 	rc = sqlite3_step(stmt);
 	if (rc != SQLITE_DONE) {
 		LOGP(DAUC, LOGL_ERROR, "Update %s number for subscriber ID=%"PRId64": SQL Error: %s\n",
 		     is_ps? "SGSN" : "VLR", subscr_id, sqlite3_errmsg(dbc->db));
 		ret = -EIO;
 		goto out;
 	}

 	/* verify execution result */
 	rc = sqlite3_changes(dbc->db);
 	if (!rc) {
 		LOGP(DAUC, LOGL_ERROR, "Cannot update %s number for subscriber ID=%"PRId64
 		     ": no such subscriber\n",
 		     is_ps? "SGSN" : "VLR", subscr_id);
 		ret = -ENOENT;
 	} else if (rc != 1) {
 		LOGP(DAUC, LOGL_ERROR, "Update %s number for subscriber ID=%"PRId64
 		       ": SQL modified %d rows (expected 1)\n",
 		       is_ps? "SGSN" : "VLR", subscr_id, rc);
 		ret = -EIO;
 	}

 out:
 	db_remove_reset(stmt);
 	return ret;
 }

 int db_subscr_purge(struct db_context *dbc, const char *imsi, bool is_ps)
 {
 	sqlite3_stmt *stmt = dbc->stmt[DB_STMT_UPD_VLR_BY_ID];
 	int rc, ret = 1;

 	if (is_ps)
 		stmt = dbc->stmt[DB_STMT_UPD_PURGE_PS_BY_IMSI];
 	else
 		stmt = dbc->stmt[DB_STMT_UPD_PURGE_CS_BY_IMSI];

 	if (!db_bind_text(stmt, NULL, imsi))
 		return -EINVAL;

 	/* execute the statement */
 	rc = sqlite3_step(stmt);
 	if (rc != SQLITE_DONE) {
 		LOGP(DAUC, LOGL_ERROR, "Error setting Purged: %d\n", rc);
 		ret = -ENOEXEC;
 	}
 	/* FIXME: return 0 in case IMSI not known */

 	db_remove_reset(stmt);

 	return ret;
 }
	/* (C) 2015 by Harald Welte <laforge@gnumonks.org>
	*
	* All Rights Reserved
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as published by
	* the Free Software Foundation; either version 3 of the License, or
	* (at your option) any later version.
	*
	* This program 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	*/

	#include <string.h>
	#include <errno.h>
	#include <inttypes.h>

	#include <osmocom/core/utils.h>
	#include <osmocom/crypt/auth.h>
	#include <osmocom/gsm/gsm23003.h>

	#include <sqlite3.h>

	#include "logging.h"
	#include "db.h"

	#define LOGHLR(imsi, level, fmt, args ...) LOGP(DAUC, level, "IMSI='%s': " fmt, imsi, ## args)

	#define SL3_TXT(x, stmt, idx) \
	do { \
	const char _txt = (const char ) sqlite3_column_text(stmt, idx);\
	if (_txt) \
	strncpy(x, _txt, sizeof(x)); \
	x[sizeof(x)-1] = '\0'; \
	} while (0)

	int db_subscr_create(struct db_context dbc, const char imsi)
	{
	sqlite3_stmt *stmt;
	int rc;

	if (!osmo_imsi_str_valid(imsi)) {
	LOGP(DAUC, LOGL_ERROR, "Cannot create subscriber: invalid IMSI: '%s'\n",
	imsi);
	return -EINVAL;
	}

	stmt = dbc->stmt[DB_STMT_SUBSCR_CREATE];

	if (!db_bind_text(stmt, "$imsi", imsi))
	return -EIO;

	/* execute the statement */
	rc = sqlite3_step(stmt);
	db_remove_reset(stmt);
	if (rc != SQLITE_DONE) {
	LOGHLR(imsi, LOGL_ERROR, "Cannot create subscriber: SQL error: (%d) %s\n",
	rc, sqlite3_errmsg(dbc->db));
	return -EIO;
	}

	return 0;
	}

	int db_subscr_delete_by_id(struct db_context *dbc, int64_t subscr_id)
	{
	int rc;
	int ret = 0;

	sqlite3_stmt *stmt = dbc->stmt[DB_STMT_DEL_BY_ID];

	if (!db_bind_int64(stmt, "$subscriber_id", subscr_id))
	return -EIO;

	/* execute the statement */
	rc = sqlite3_step(stmt);
	if (rc != SQLITE_DONE) {
	LOGP(DAUC, LOGL_ERROR,
	"Cannot delete subscriber ID=%"PRId64": SQL error: (%d) %s\n",
	subscr_id, rc, sqlite3_errmsg(dbc->db));
	db_remove_reset(stmt);
	return -EIO;
	}

	/* verify execution result */
	rc = sqlite3_changes(dbc->db);
	if (!rc) {
	LOGP(DAUC, LOGL_ERROR, "Cannot delete: no such subscriber: ID=%"PRId64"\n",
	subscr_id);
	ret = -ENOENT;
	} else if (rc != 1) {
	LOGP(DAUC, LOGL_ERROR, "Delete subscriber ID=%"PRId64
	": SQL modified %d rows (expected 1)\n", subscr_id, rc);
	ret = -EIO;
	}

	/* FIXME: also remove authentication data from auc_2g and auc_3g */

	db_remove_reset(stmt);
	return ret;
	}

	int db_subscr_update_msisdn_by_imsi(struct db_context dbc, const char imsi,
	const char *msisdn)
	{
	int rc;
	int ret = 0;

	if (!osmo_msisdn_str_valid(msisdn)) {
	LOGHLR(imsi, LOGL_ERROR,
	"Cannot update subscriber: invalid MSISDN: '%s'\n",
	msisdn);
	return -EINVAL;
	}

	sqlite3_stmt *stmt = dbc->stmt[DB_STMT_SET_MSISDN_BY_IMSI];

	if (!db_bind_text(stmt, "$imsi", imsi))
	return -EIO;
	if (!db_bind_text(stmt, "$msisdn", msisdn))
	return -EIO;

	/* execute the statement */
	rc = sqlite3_step(stmt);
	if (rc != SQLITE_DONE) {
	LOGHLR(imsi, LOGL_ERROR,
	"Cannot update subscriber's MSISDN: SQL error: (%d) %s\n",
	rc, sqlite3_errmsg(dbc->db));
	ret = -EIO;
	goto out;
	}

	/* verify execution result */
	rc = sqlite3_changes(dbc->db);
	if (!rc) {
	LOGP(DAUC, LOGL_ERROR, "Cannot update MSISDN: no such subscriber: IMSI='%s'\n",
	imsi);
	ret = -ENOENT;
	goto out;
	} else if (rc != 1) {
	LOGHLR(imsi, LOGL_ERROR, "Update MSISDN: SQL modified %d rows (expected 1)\n", rc);
	ret = -EIO;
	}

	out:
	db_remove_reset(stmt);
	return ret;

	}

	/* Common code for db_subscr_get_by_() functions. /
	static int db_sel(struct db_context dbc, sqlite3_stmt stmt, struct hlr_subscriber *subscr,
	const char **err)
	{
	int rc;
	int ret = 0;

	/* execute the statement */
	rc = sqlite3_step(stmt);
	if (rc == SQLITE_DONE) {
	ret = -ENOENT;
	goto out;
	}
	if (rc != SQLITE_ROW) {
	ret = -EIO;
	goto out;
	}

	if (!subscr)
	goto out;

	/* obtain the various columns */
	subscr->id = sqlite3_column_int64(stmt, 0);
	SL3_TXT(subscr->imsi, stmt, 1);
	SL3_TXT(subscr->msisdn, stmt, 2);
	/* FIXME: These should all be BLOBs as they might contain NUL */
	SL3_TXT(subscr->vlr_number, stmt, 3);
	SL3_TXT(subscr->sgsn_number, stmt, 4);
	SL3_TXT(subscr->sgsn_address, stmt, 5);
	subscr->periodic_lu_timer = sqlite3_column_int(stmt, 6);
	subscr->periodic_rau_tau_timer = sqlite3_column_int(stmt, 7);
	subscr->nam_cs = sqlite3_column_int(stmt, 8);
	subscr->nam_ps = sqlite3_column_int(stmt, 9);
	subscr->lmsi = sqlite3_column_int(stmt, 10);
	subscr->ms_purged_cs = sqlite3_column_int(stmt, 11);
	subscr->ms_purged_ps = sqlite3_column_int(stmt, 12);

	out:
	db_remove_reset(stmt);

	switch (ret) {
	case 0:
	*err = NULL;
	break;
	case -ENOENT:
	*err = "No such subscriber";
	break;
	default:
	*err = sqlite3_errmsg(dbc->db);
	break;
	}
	return ret;
	}

	int db_subscr_get_by_imsi(struct db_context dbc, const char imsi,
	struct hlr_subscriber *subscr)
	{
	sqlite3_stmt *stmt = dbc->stmt[DB_STMT_SEL_BY_IMSI];
	const char *err;
	int rc;

	if (!db_bind_text(stmt, NULL, imsi))
	return -EIO;

	rc = db_sel(dbc, stmt, subscr, &err);
	if (rc)
	LOGP(DAUC, LOGL_ERROR, "Cannot read subscriber from db: IMSI='%s': %s\n",
	imsi, err);
	return rc;
	}

	int db_subscr_get_by_msisdn(struct db_context dbc, const char msisdn,
	struct hlr_subscriber *subscr)
	{
	sqlite3_stmt *stmt = dbc->stmt[DB_STMT_SEL_BY_MSISDN];
	const char *err;
	int rc;

	if (!db_bind_text(stmt, NULL, msisdn))
	return -EIO;

	rc = db_sel(dbc, stmt, subscr, &err);
	if (rc)
	LOGP(DAUC, LOGL_ERROR, "Cannot read subscriber from db: MSISDN='%s': %s\n",
	msisdn, err);
	return rc;
	}

	int db_subscr_get_by_id(struct db_context *dbc, int64_t id,
	struct hlr_subscriber *subscr)
	{
	sqlite3_stmt *stmt = dbc->stmt[DB_STMT_SEL_BY_ID];
	const char *err;
	int rc;

	if (!db_bind_int64(stmt, NULL, id))
	return -EIO;

	rc = db_sel(dbc, stmt, subscr, &err);
	if (rc)
	LOGP(DAUC, LOGL_ERROR, "Cannot read subscriber from db: ID=%"PRId64": %s\n",
	id, err);
	return rc;
	}

	/* Enable or disable PS or CS for a subscriber.
	* For the subscriber with the given imsi, set nam_ps (when is_ps == true) or
	* nam_cs (when is_ps == false) to nam_val in the database.
	* Returns 0 on success, -ENOENT when the given IMSI does not exist, -EINVAL if
	* the SQL statement could not be composed, -ENOEXEC if running the SQL
	* statement failed, -EIO if the amount of rows modified is unexpected.
	*/
	int db_subscr_nam(struct db_context dbc, const char imsi, bool nam_val, bool is_ps)
	{
	sqlite3_stmt *stmt;
	int rc;
	int ret = 0;

	stmt = dbc->stmt[is_ps ? DB_STMT_UPD_NAM_PS_BY_IMSI
	: DB_STMT_UPD_NAM_CS_BY_IMSI];

	if (!db_bind_text(stmt, "$imsi", imsi))
	return -EIO;
	if (!db_bind_int(stmt, "$val", nam_val ? 1 : 0))
	return -EIO;

	/* execute the statement */
	rc = sqlite3_step(stmt);
	if (rc != SQLITE_DONE) {
	LOGHLR(imsi, LOGL_ERROR, "%s %s: SQL error: %s\n",
	nam_val ? "enable" : "disable",
	is_ps ? "PS" : "CS",
	sqlite3_errmsg(dbc->db));
	ret = -EIO;
	goto out;
	}

	/* verify execution result */
	rc = sqlite3_changes(dbc->db);
	if (!rc) {
	LOGP(DAUC, LOGL_ERROR, "Cannot %s %s: no such subscriber: IMSI='%s'\n",
	nam_val ? "enable" : "disable",
	is_ps ? "PS" : "CS",
	imsi);
	ret = -ENOENT;
	goto out;
	} else if (rc != 1) {
	LOGHLR(imsi, LOGL_ERROR, "%s %s: SQL modified %d rows (expected 1)\n",
	nam_val ? "enable" : "disable",
	is_ps ? "PS" : "CS",
	rc);
	ret = -EIO;
	}

	out:
	db_remove_reset(stmt);
	return ret;
	}

	int db_subscr_lu(struct db_context *dbc, int64_t subscr_id,
	const char *vlr_or_sgsn_number, bool is_ps)
	{
	sqlite3_stmt *stmt;
	int rc, ret = 0;

	stmt = dbc->stmt[is_ps ? DB_STMT_UPD_SGSN_BY_ID
	: DB_STMT_UPD_VLR_BY_ID];

	if (!db_bind_int64(stmt, "$subscriber_id", subscr_id))
	return -EIO;

	if (!db_bind_text(stmt, "$number", vlr_or_sgsn_number))
	return -EIO;

	/* execute the statement */
	rc = sqlite3_step(stmt);
	if (rc != SQLITE_DONE) {
	LOGP(DAUC, LOGL_ERROR, "Update %s number for subscriber ID=%"PRId64": SQL Error: %s\n",
	is_ps? "SGSN" : "VLR", subscr_id, sqlite3_errmsg(dbc->db));
	ret = -EIO;
	goto out;
	}

	/* verify execution result */
	rc = sqlite3_changes(dbc->db);
	if (!rc) {
	LOGP(DAUC, LOGL_ERROR, "Cannot update %s number for subscriber ID=%"PRId64
	": no such subscriber\n",
	is_ps? "SGSN" : "VLR", subscr_id);
	ret = -ENOENT;
	} else if (rc != 1) {
	LOGP(DAUC, LOGL_ERROR, "Update %s number for subscriber ID=%"PRId64
	": SQL modified %d rows (expected 1)\n",
	is_ps? "SGSN" : "VLR", subscr_id, rc);
	ret = -EIO;
	}

	out:
	db_remove_reset(stmt);
	return ret;
	}

	int db_subscr_purge(struct db_context dbc, const char imsi, bool is_ps)
	{
	sqlite3_stmt *stmt = dbc->stmt[DB_STMT_UPD_VLR_BY_ID];
	int rc, ret = 1;

	if (is_ps)
	stmt = dbc->stmt[DB_STMT_UPD_PURGE_PS_BY_IMSI];
	else
	stmt = dbc->stmt[DB_STMT_UPD_PURGE_CS_BY_IMSI];

	if (!db_bind_text(stmt, NULL, imsi))
	return -EINVAL;

	/* execute the statement */
	rc = sqlite3_step(stmt);
	if (rc != SQLITE_DONE) {
	LOGP(DAUC, LOGL_ERROR, "Error setting Purged: %d\n", rc);
	ret = -ENOEXEC;
	}
	/* FIXME: return 0 in case IMSI not known */

	db_remove_reset(stmt);

	return ret;
	}