diff options
| author | Neels Hofmeyr <neels@hofmeyr.de> | 2019-01-05 00:38:54 +0100 |
|---|---|---|
| committer | Neels Hofmeyr <nhofmeyr@sysmocom.de> | 2019-01-08 14:07:07 +0000 |
| commit | 02fd83d79991665d59362f24d7a0ed263c6d91c0 (patch) | |
| tree | cd31ee90c77959890075acfea33547e76ec5e527 /src/gsm/gsm48.c | |
| parent | 45f89c938dcd5fce0bcaeee2e88c3ad7247277a0 (diff) | |
add osmo_mi_name(), for MI-to-string like "IMSI-123456"
We have gsm48_mi_to_string() and osmo_bcd2str(), but still lack a function that
conveniently prints both MI type and value in one function call.
Related: http://people.osmocom.org/neels/mi_mi_mi.jpg
Change-Id: I7798c3ef983c2e333b2b9cbffef6f366f370bd81
Diffstat (limited to 'src/gsm/gsm48.c')
| -rw-r--r-- | src/gsm/gsm48.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/gsm/gsm48.c b/src/gsm/gsm48.c index 190622ff..853ea513 100644 --- a/src/gsm/gsm48.c +++ b/src/gsm/gsm48.c @@ -433,6 +433,42 @@ const char *gsm48_mi_type_name(uint8_t mi) return get_value_string(mi_type_names, mi); } +/*! Return a human readable representation of a Mobile Identity in static buffer. + * \param[in] mi Mobile Identity buffer containing 3GPP TS 04.08 style MI type and data. + * \param[in] mi_len Length of mi. + * \return A string like "IMSI-1234567", "TMSI-0x1234ABCD" or "unknown", "TMSI-invalid"... + */ +const char *osmo_mi_name(const uint8_t *mi, uint8_t mi_len) +{ + static char mi_name[10 + GSM48_MI_SIZE + 1]; + uint8_t mi_type; + uint32_t tmsi; + char mi_string[GSM48_MI_SIZE]; + + mi_type = (mi && mi_len) ? (mi[0] & GSM_MI_TYPE_MASK) : GSM_MI_TYPE_NONE; + + switch (mi_type) { + case GSM_MI_TYPE_TMSI: + /* Table 10.5.4.3, reverse generate_mid_from_tmsi */ + if (mi_len == GSM48_TMSI_LEN && mi[0] == (0xf0 | GSM_MI_TYPE_TMSI)) { + tmsi = osmo_load32be(&mi[1]); + snprintf(mi_name, sizeof(mi_name), "TMSI-0x%08" PRIX32, tmsi); + return mi_name; + } + return "TMSI-invalid"; + + case GSM_MI_TYPE_IMSI: + case GSM_MI_TYPE_IMEI: + case GSM_MI_TYPE_IMEISV: + osmo_bcd2str(mi_string, sizeof(mi_string), mi, 1, (mi_len * 2) - (mi[0] & GSM_MI_ODD ? 0 : 1), true); + snprintf(mi_name, sizeof(mi_name), "%s-%s", gsm48_mi_type_name(mi_type), mi_string); + return mi_name; + + default: + return "unknown"; + } +} + /*! Checks is particular message is cipherable in A/Gb mode according to * 3GPP TS 24.008 ยง 4.7.1.2 * \param[in] hdr Message header |