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Parse pin codes starting with '$' as hexadecimal encoded strings

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If a pin code is retrieved from an agent and the first character is
a dollar sign '$', then the pin is decoded as following:
 - The first character (dollar sign) is stripped from the pin
 - The rest is parsed as hexadecimal numbers, where each two characters
   will be converted into a one byte integer. If an odd number of
   characters follows, then the last character is stripped.
Parser is case insensitive. Pins not starting with '$' are parsed
as usual.

For instance:
 pin: $0A3e005067
is decoded into a 5 byte pin:
 decoded: 0x0a 0x3e 0x00 0x50 0x67
This commit is contained in:
David Herrmann 2011-05-05 22:10:30 +02:00 committed by Johan Hedberg
parent 90e0b59b97
commit c70a4afe43
1 changed files with 32 additions and 3 deletions
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35
src/event.c
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@ -102,24 +102,53 @@ static gboolean get_adapter_and_device(bdaddr_t *src, bdaddr_t *dst,
*
*****************************************************************/
static size_t decode_hex(const char *pin, char *out)
{
size_t i;
for (i = 0; i < 16 && pin[i * 2] && pin[i * 2 + 1]; i++)
sscanf(&pin[i * 2], "%02hhX", &out[i]);
return i;
}
static size_t decode_pin(const char *pin, char *out)
{
size_t len;
if (!pin)
return 0;
if (pin[0] == '$') {
len = decode_hex(&pin[1], out);
} else {
len = strnlen(pin, 16);
memcpy(out, pin, len);
}
return len;
}
static void pincode_cb(struct agent *agent, DBusError *derr,
const char *pincode, struct btd_device *device)
{
struct btd_adapter *adapter = device_get_adapter(device);
bdaddr_t dba;
int err;
size_t len;
char rawpin[16];
device_get_address(device, &dba);
if (derr) {
len = decode_pin(pincode, rawpin);
if (derr || !len) {
err = btd_adapter_pincode_reply(adapter, &dba, NULL, 0);
if (err < 0)
goto fail;
return;
}
err = btd_adapter_pincode_reply(adapter, &dba, pincode,
pincode ? strlen(pincode) : 0);
err = btd_adapter_pincode_reply(adapter, &dba, rawpin, len);
if (err < 0)
goto fail;