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C-Netz: Add authentication support (process only)

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No real authentication, since the algorithm and the keys inside the cards
are not known. A challenge can be specified and optionally the response
can be verified.
This commit is contained in:
Andreas Eversberg
2019-06-29 07:49:28 +02:00
parent 5d9a9b59c3
commit 13245c56f6
11 changed files with 220 additions and 76 deletions
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27
src/cnetz/database.c
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@@ -40,6 +40,7 @@ typedef struct cnetz_database {
uint8_t futln_nat; /* who ... */
uint8_t futln_fuvst;
uint16_t futln_rest;
int futelg_bit; /* chip card inside */
int extended; /* mobile supports extended frequencies */
struct timer timer; /* timer for next availability check */
int retry; /* counts number of retries */
@@ -89,7 +90,7 @@ static void db_timeout(struct timer *timer)
}
/* create/update db entry */
int update_db(cnetz_t __attribute__((unused)) *cnetz, uint8_t futln_nat, uint8_t futln_fuvst, uint16_t futln_rest, int extended, int busy, int failed)
int update_db(cnetz_t __attribute__((unused)) *cnetz, uint8_t futln_nat, uint8_t futln_fuvst, uint16_t futln_rest, int *futelg_bit, int *extended, int busy, int failed)
{
cnetz_db_t *db, **dbp;
@@ -123,8 +124,11 @@ int update_db(cnetz_t __attribute__((unused)) *cnetz, uint8_t futln_nat, uint8_t
PDEBUG(DDB, DEBUG_INFO, "Adding subscriber '%d,%d,%d' to database.\n", db->futln_nat, db->futln_fuvst, db->futln_rest);
}
if (extended >= 0)
db->extended = extended;
if (futelg_bit && *futelg_bit >= 0)
db->futelg_bit = *futelg_bit;
if (extended && *extended >= 0)
db->extended = *extended;
if (busy) {
PDEBUG(DDB, DEBUG_INFO, "Subscriber '%d,%d,%d' busy now.\n", db->futln_nat, db->futln_fuvst, db->futln_rest);
@@ -143,18 +147,27 @@ int update_db(cnetz_t __attribute__((unused)) *cnetz, uint8_t futln_nat, uint8_t
timer_start(&db->timer, MELDE_WIEDERHOLUNG); /* when to do retry */
}
return db->extended;
if (futelg_bit)
*futelg_bit = db->futelg_bit;
if (extended)
*extended = db->extended;
return 0;
}
int find_db(uint8_t futln_nat, uint8_t futln_fuvst, uint16_t futln_rest)
int find_db(uint8_t futln_nat, uint8_t futln_fuvst, uint16_t futln_rest, int *futelg_bit, int *extended)
{
cnetz_db_t *db = cnetz_db_head;
while (db) {
if (db->futln_nat == futln_nat
&& db->futln_fuvst == futln_fuvst
&& db->futln_rest == futln_rest)
return db->extended;
&& db->futln_rest == futln_rest) {
if (futelg_bit)
*futelg_bit = db->futelg_bit;
if (extended)
*extended = db->extended;
return 0;
}
db = db->next;
}
return -1;