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Since OsmoMSC has built-in SMSC, it needs to store the messages somewhere. Currently we use libdbi and SQLite3 back-end for that. For a long time, the db_sms_* API remained uncovered by unit tests. This change aims to fix that, and does cover the following calls: - db_sms_store(), - db_sms_get(), - db_sms_get_next_unsent(), - db_sms_mark_delivered(), - db_sms_delete_sent_message_by_id(), - db_sms_delete_by_msisdn(), - db_sms_delete_oldest_expired_message(). Due to performance reasons, the test database is initialized in RAM using the magic filename ':memory:'. This is a feature of SQLite3 (and not libdbi), see: https://www.sqlite.org/inmemorydb.html Of course, this unit test helped to discover some problems: 1) Storing an SMS with empty TP-User-Data (TP-UDL=0) causes buffer overruns in both db_sms_store() and db_sms_get(). 2) TP-User-Data-Length is always being interpreted in octets, regardless of DCS (Data Coding Scheme). This results in storing garbage in the database if the default 7-bit encoding is used. Fortunately, the 'user_data' buffer in structure 'gsm_sms' is large emough, so we don't experience buffer overruns. 3) db_sms_delete_oldest_expired_message() doesn't work as expected. Instead of removing the *oldest* expired message, it tries to remove the *newest* one. The current test expectations do reflect these problems. All of them will be fixed in the follow-up patches. Change-Id: Id94ad35b6f78f839137db2e17010fbf9b40111a3
About OsmoMSC ============= OsmoMSC originated from the OpenBSC project, which started as a minimalistic all-in-one implementation of the GSM Network. In 2017, OpenBSC had reached maturity and diversity (including M3UA SIGTRAN and 3G support in the form of IuCS and IuPS interfaces) that naturally lead to a separation of the all-in-one approach to fully independent separate programs as in typical GSM networks. OsmoMSC was one of the parts split off from the old openbsc.git. Before, it was the libmsc part of the old OsmoNITB. Since a true A interface and IuCS for 3G support is available, OsmoMSC exists only as a separate standalone entity. OsmoMSC exposes - GSUP towards OsmoHLR (or a MAP proxy); - A over IP towards a BSC (e.g. OsmoBSC); - IuCS towards an RNC or HNB-GW (e.g. OsmoHNBGW) for 3G voice; - MNCC (Mobile Network Call Control derived from GSM TS 04.07); - SMPP 3.4 (Short Message Peer-to-Peer); - The Osmocom typical telnet VTY and CTRL interfaces. Find OsmoMSC issue tracker and wiki online at https://osmocom.org/projects/osmomsc https://osmocom.org/projects/osmomsc/wiki