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Inform user if target UID can be emulated

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New error: ETGUIDNOTSUP raised when UID is not 4 bytes long or does not start with 0x08 (Security restriction present in the NXP PN53x chips)
This commit is contained in:
Romuald Conty 2011-01-07 16:15:18 +00:00
parent 03963ef535
commit 0f8c23bddd
3 changed files with 24 additions and 14 deletions
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11
libnfc/chips/pn53x.c
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@ -759,7 +759,9 @@ static struct sErrorMessage {
{ ENFCID3, "NFCID3 Mismatch" },
{ EOVCURRENT, "Over Current" },
{ ENAD, "NAD Missing in DEP Frame" },
/* Driver-level error */
/* Software level errors */
{ ETGUIDNOTSUP, "Target UID not supported" }, // In target mode, PN53x only support 4 bytes UID and the first byte must start with 0x08
/* Driver-level errors */
{ DENACK, "Received NACK" },
{ DEACKMISMATCH, "Expected ACK/NACK" },
{ DEISERRFRAME, "Received an error frame" },
@ -1177,9 +1179,14 @@ pn53x_target_init (nfc_device_t * pnd, nfc_target_t * pnt, byte_t * pbtRx, size_
switch (pnt->nm.nmt) {
case NMT_ISO14443A:
ptm = PTM_PASSIVE_ONLY;
if ((pnt->nti.nai.abtUid[0] != 0x08) || (pnt->nti.nai.szUidLen != 4)) {
pnd->iLastError = ETGUIDNOTSUP;
return false;
}
pn53x_set_parameter(pnd, PARAM_AUTO_ATR_RES, false);
if (pnd->nc == NC_PN532) { // We have a PN532
if ((pnt->nti.nai.btSak & SAK_ISO14443_4_COMPLIANT) && (pnd->bAutoIso14443_4)) { // We have a ISO14443-4 tag to emulate and NDO_AUTO_14443_4A option is enabled
if ((pnt->nti.nai.btSak & SAK_ISO14443_4_COMPLIANT) && (pnd->bAutoIso14443_4)) {
// We have a ISO14443-4 tag to emulate and NDO_AUTO_14443_4A option is enabled
ptm |= PTM_ISO14443_4_PICC_ONLY; // We add ISO14443-4 restriction
pn53x_set_parameter(pnd, PARAM_14443_4_PICC, true);
} else {