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Add preliminary MNC length determination based on IMSI

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Some SIM cards do not include MNC length with in EF_AD. Try to figure
out the MNC length based on the MCC/MNC values in the beginning of the
IMSI. This covers a prepaid Elisa/Kolumbus card that would have ended
up using incorrect MNC length based on the 3-digit default.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-01-22 21:33:57 +02:00
parent a3e0105692
commit e6c6274947
1 changed files with 22 additions and 0 deletions
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22
src/eap_peer/eap.c
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@ -879,6 +879,26 @@ static void eap_sm_processIdentity(struct eap_sm *sm, const struct wpabuf *req)
#ifdef PCSC_FUNCS
/*
* Rules for figuring out MNC length based on IMSI for SIM cards that do not
* include MNC length field.
*/
static int mnc_len_from_imsi(const char *imsi)
{
char mcc_str[4];
unsigned int mcc;
os_memcpy(mcc_str, imsi, 3);
mcc_str[3] = '\0';
mcc = atoi(mcc_str);
if (mcc == 244)
return 2; /* Networks in Finland use 2-digit MNC */
return -1;
}
static int eap_sm_append_3gpp_realm(struct eap_sm *sm, char *imsi,
size_t max_len, size_t *imsi_len)
{
@ -892,6 +912,8 @@ static int eap_sm_append_3gpp_realm(struct eap_sm *sm, char *imsi,
/* MNC (2 or 3 digits) */
mnc_len = scard_get_mnc_len(sm->scard_ctx);
if (mnc_len < 0)
mnc_len = mnc_len_from_imsi(imsi);
if (mnc_len < 0) {
wpa_printf(MSG_INFO, "Failed to get MNC length from (U)SIM "
"assuming 3");