add first sketch of a DB backend
diff --git a/src/db.c b/src/db.c
new file mode 100644
index 0000000..904281a
--- /dev/null
+++ b/src/db.c
@@ -0,0 +1,198 @@
+#include "db.h"
+
+#include <stdio.h>
+#include <dbi/dbi.h>
+
+dbi_conn conn;
+
+void db__error_func(dbi_conn conn, void* data) {
+ const char* msg;
+ dbi_conn_error(conn, &msg);
+ printf("DBI: %s\n", msg);
+}
+
+int db_init() {
+ dbi_initialize(NULL);
+ conn = dbi_conn_new("sqlite3");
+
+ dbi_conn_error_handler( conn, db__error_func, NULL );
+
+ /* MySQL
+ dbi_conn_set_option(conn, "host", "localhost");
+ dbi_conn_set_option(conn, "username", "your_name");
+ dbi_conn_set_option(conn, "password", "your_password");
+ dbi_conn_set_option(conn, "dbname", "your_dbname");
+ dbi_conn_set_option(conn, "encoding", "UTF-8");
+ */
+
+ /* SqLite 3 */
+ dbi_conn_set_option(conn, "sqlite3_dbdir", "/tmp");
+ dbi_conn_set_option(conn, "dbname", "hlr.sqlite3");
+
+ if (dbi_conn_connect(conn) < 0) {
+ return 1;
+ }
+
+ return 0;
+}
+
+int db_prepare() {
+ dbi_result result;
+ result = dbi_conn_query(conn,
+ "CREATE TABLE IF NOT EXISTS Subscriber ("
+ "id INTEGER PRIMARY KEY AUTOINCREMENT, "
+ "imsi INTEGER UNIQUE NOT NULL, "
+ "tmsi INTEGER UNIQUE, "
+ "extension TEXT UNIQUE, "
+ "lac INTEGER"
+ ")"
+ );
+ if (result==NULL) {
+ printf("DB: Failed to create Subscriber table.\n");
+ return 1;
+ }
+ dbi_result_free(result);
+ result = dbi_conn_query(conn,
+ "CREATE TABLE IF NOT EXISTS Equipment ("
+ "id INTEGER PRIMARY KEY AUTOINCREMENT, "
+ "imei INTEGER UNIQUE NOT NULL"
+ ")"
+ );
+ if (result==NULL) {
+ printf("DB: Failed to create Equipment table.\n");
+ return 1;
+ }
+ dbi_result_free(result);
+ return 0;
+}
+
+int db_fini() {
+ dbi_conn_close(conn);
+ dbi_shutdown();
+}
+
+int db_insert_imei(uint64_t imei) {
+ dbi_result result;
+ result = dbi_conn_queryf(conn,
+ "INSERT OR IGNORE INTO Equipment "
+ "(imei) "
+ "VALUES "
+ "(%llu) ",
+ imei
+ );
+ if (result==NULL) {
+ printf("DB: Failed to create Equipment by IMEI.\n");
+ return 1;
+ }
+ dbi_result_free(result);
+ return 0;
+}
+
+int db_insert_imsi(uint64_t imsi) {
+ dbi_result result;
+ result = dbi_conn_queryf(conn,
+ "INSERT OR IGNORE INTO Subscriber "
+ "(imsi) "
+ "VALUES "
+ "(%llu) ",
+ imsi
+ );
+ if (result==NULL) {
+ printf("DB: Failed to create Subscriber by IMSI.\n");
+ return 1;
+ }
+ dbi_result_free(result);
+ return 0;
+}
+
+int db_imsi_set_tmsi(uint64_t imsi, uint64_t tmsi) {
+ if (db_insert_imsi(imsi)) {
+ return 1;
+ }
+ dbi_result result;
+ result = dbi_conn_queryf(conn,
+ "UPDATE Subscriber "
+ "SET tmsi = %llu "
+ "WHERE imsi = %llu ",
+ tmsi, imsi
+ );
+ if (result==NULL) {
+ printf("DB: Failed to update Subscriber with TMSI by IMSI.\n");
+ return 1;
+ }
+ dbi_result_free(result);
+ return 0;
+}
+
+int db_imsi_set_lac(uint64_t imsi, uint16_t lac) {
+ if (db_insert_imsi(imsi)) {
+ return 1;
+ }
+ dbi_result result;
+ result = dbi_conn_queryf(conn,
+ "UPDATE Subscriber "
+ "SET lac = %u "
+ "WHERE imsi = %llu ",
+ lac, imsi
+ );
+ if (result==NULL) {
+ printf("DB: Failed to update Subscriber with LAC by IMSI.\n");
+ return 1;
+ }
+ dbi_result_free(result);
+ return 0;
+}
+
+int db__parse_subscriber(dbi_result result, db_subscriber* subscriber) {
+ if (!dbi_result_first_row(result)) {
+ printf("DB: Failed to find Subscriber.\n");
+ return 1;
+ }
+ subscriber->imsi = dbi_result_get_ulonglong(result, "imsi");
+ subscriber->tmsi = dbi_result_get_ulonglong(result, "tmsi");
+ // FIXME handle extension
+ subscriber->lac = dbi_result_get_uint(result, "lac");
+ printf("DB: Subscriber: IMSI %llu, TMSI %llu, LAC %hu\n", subscriber->imsi, subscriber->tmsi, subscriber->lac);
+ return 0;
+}
+
+int db_imsi_get_subscriber(uint64_t imsi, db_subscriber* subscriber) {
+ dbi_result result;
+ result = dbi_conn_queryf(conn,
+ "SELECT * FROM Subscriber "
+ "WHERE imsi = %llu ",
+ imsi
+ );
+ if (result==NULL) {
+ printf("DB: Failed to find Subscriber by IMSI.\n");
+ return 1;
+ }
+ if (db__parse_subscriber(result, subscriber)) {
+ printf("DB: Failed to parse Subscriber.\n");
+ dbi_result_free(result);
+ return 1;
+ }
+ dbi_result_free(result);
+ return 0;
+}
+
+int db_tmsi_get_subscriber(uint64_t tmsi, db_subscriber* subscriber) {
+ dbi_result result;
+ result = dbi_conn_queryf(conn,
+ "SELECT * FROM Subscriber "
+ "WHERE tmsi = %llu ",
+ tmsi
+ );
+ if (result==NULL) {
+ printf("DB: Failed to find Subscriber by TMSI.\n");
+ return 1;
+ }
+ if (db__parse_subscriber(result, subscriber)) {
+ printf("DB: Failed to parse Subscriber.\n");
+ dbi_result_free(result);
+ return 1;
+ }
+ dbi_result_free(result);
+ return 0;
+}
+