From 4d358c00e1b3389291bdb3d5c40d0da8d6cf4d02 Mon Sep 17 00:00:00 2001 From: Neels Hofmeyr Date: Thu, 22 Feb 2018 03:19:05 +0100 Subject: gsm48_ra_id_by_bts(): struct gsm48_ra_id* instead of buf MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Move from using deprecated gsm48_construct_ra(), which uses a buf, to gsm48_encode_ra(), which uses a gsm48_ra_id argument. Pass struct gsm48_ra_id around instead of a buf. struct gsm48_ra_id is the "encoded" representation of the bytes in a typical MCC-MNC-LAC-RAC (04.08 Routing Area Id IE, 3GPP TS 24.008 ยง 10.5.5.15). Using the struct spares using magic numbers for byte offsets. In the process, fix a sanitizer warning for unaligned access by using memcpy() instead of pointer assignment: osmo-bsc/src/libbsc/abis_nm.c:2857:27: runtime error: store to misaligned address 0x7ffe8e0d6695 for type 'uint16_t', which requires 2 byte alignment Note that (besides removing a now unnecessary cast) the gsm0408_test and abis_test tests of RAI / CGI encoding remain stable, which indicates that the new code is still correct. Change-Id: I0d3908fb8ca1e2e669d257b5d59b40675fa85d06 --- include/osmocom/bsc/gsm_data.h | 2 +- src/libbsc/abis_nm.c | 10 ++++++---- src/libbsc/gsm_data.c | 5 ++--- tests/gsm0408/gsm0408_test.c | 2 +- 4 files changed, 10 insertions(+), 9 deletions(-) diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h index 3c65c9c3f..8692469b4 100644 --- a/include/osmocom/bsc/gsm_data.h +++ b/include/osmocom/bsc/gsm_data.h @@ -1353,7 +1353,7 @@ enum bts_gprs_mode bts_gprs_mode_parse(const char *arg, int *valid); const char *bts_gprs_mode_name(enum bts_gprs_mode mode); int bts_gprs_mode_is_compat(struct gsm_bts *bts, enum bts_gprs_mode mode); -int gsm48_ra_id_by_bts(uint8_t *buf, struct gsm_bts *bts); +void gsm48_ra_id_by_bts(struct gsm48_ra_id *buf, struct gsm_bts *bts); void gprs_ra_id_by_bts(struct gprs_ra_id *raid, struct gsm_bts *bts); int gsm_btsmodel_set_feature(struct gsm_bts_model *model, enum gsm_bts_features feat); diff --git a/src/libbsc/abis_nm.c b/src/libbsc/abis_nm.c index 671c87419..435d00453 100644 --- a/src/libbsc/abis_nm.c +++ b/src/libbsc/abis_nm.c @@ -2850,10 +2850,12 @@ int abis_nm_ipaccess_set_attr(struct gsm_bts *bts, uint8_t obj_class, void abis_nm_ipaccess_cgi(uint8_t *buf, struct gsm_bts *bts) { - /* we simply reuse the GSM48 function and overwrite the RAC - * with the Cell ID */ - gsm48_ra_id_by_bts(buf, bts); - *((uint16_t *)(buf + 5)) = htons(bts->cell_identity); + struct gsm48_ra_id *_buf = (struct gsm48_ra_id*)buf; + uint16_t ci = htons(bts->cell_identity); + /* we simply reuse the GSM48 function and write the Cell ID over the position where the RAC + * starts */ + gsm48_ra_id_by_bts(_buf, bts); + memcpy(&_buf->rac, &ci, sizeof(ci)); } void gsm_trx_lock_rf(struct gsm_bts_trx *trx, bool locked, const char *reason) diff --git a/src/libbsc/gsm_data.c b/src/libbsc/gsm_data.c index 15945228a..d4a6a70f9 100644 --- a/src/libbsc/gsm_data.c +++ b/src/libbsc/gsm_data.c @@ -279,13 +279,12 @@ void gprs_ra_id_by_bts(struct gprs_ra_id *raid, struct gsm_bts *bts) }; } -int gsm48_ra_id_by_bts(uint8_t *buf, struct gsm_bts *bts) +void gsm48_ra_id_by_bts(struct gsm48_ra_id *buf, struct gsm_bts *bts) { struct gprs_ra_id raid; gprs_ra_id_by_bts(&raid, bts); - - return gsm48_construct_ra(buf, &raid); + gsm48_encode_ra(buf, &raid); } int gsm_parse_reg(void *ctx, regex_t *reg, char **str, int argc, const char **argv) diff --git a/tests/gsm0408/gsm0408_test.c b/tests/gsm0408/gsm0408_test.c index d1d50f135..aeec56f4c 100644 --- a/tests/gsm0408/gsm0408_test.c +++ b/tests/gsm0408/gsm0408_test.c @@ -801,7 +801,7 @@ static void test_gsm48_ra_id_by_bts() bts.location_area_code = t->lac; bts.gprs.rac = t->rac; - gsm48_ra_id_by_bts((uint8_t*)&result, &bts); + gsm48_ra_id_by_bts(&result, &bts); ok = (t->expect.digits[0] == result.digits[0]) && (t->expect.digits[1] == result.digits[1]) -- cgit v1.2.3