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Willem Oldemans
2021-10-02 11:41:29 +02:00
commit ae7421a5b3
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309
llcp.cpp Normal file
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#include "llcp.h"
#include "PN532_debug.h"
// LLCP PDU Type Values
#define PDU_SYMM 0x00
#define PDU_PAX 0x01
#define PDU_CONNECT 0x04
#define PDU_DISC 0x05
#define PDU_CC 0x06
#define PDU_DM 0x07
#define PDU_I 0x0c
#define PDU_RR 0x0d
uint8_t LLCP::SYMM_PDU[2] = {0, 0};
inline uint8_t getPType(const uint8_t *buf)
{
return ((buf[0] & 0x3) << 2) + (buf[1] >> 6);
}
inline uint8_t getSSAP(const uint8_t *buf)
{
return buf[1] & 0x3f;
}
inline uint8_t getDSAP(const uint8_t *buf)
{
return buf[0] >> 2;
}
int8_t LLCP::activate(uint16_t timeout)
{
return link.activateAsTarget(timeout);
}
int8_t LLCP::waitForConnection(uint16_t timeout)
{
uint8_t type;
mode = 1;
ns = 0;
nr = 0;
// Get CONNECT PDU
DMSG("wait for a CONNECT PDU\n");
do {
if (2 > link.read(headerBuf, headerBufLen)) {
return -1;
}
type = getPType(headerBuf);
if (PDU_CONNECT == type) {
break;
} else if (PDU_SYMM == type) {
if (!link.write(SYMM_PDU, sizeof(SYMM_PDU))) {
return -2;
}
} else {
return -3;
}
} while (1);
// Put CC PDU
DMSG("put a CC(Connection Complete) PDU to response the CONNECT PDU\n");
ssap = getDSAP(headerBuf);
dsap = getSSAP(headerBuf);
headerBuf[0] = (dsap << 2) + ((PDU_CC >> 2) & 0x3);
headerBuf[1] = ((PDU_CC & 0x3) << 6) + ssap;
if (!link.write(headerBuf, 2)) {
return -2;
}
return 1;
}
int8_t LLCP::waitForDisconnection(uint16_t timeout)
{
uint8_t type;
// Get DISC PDU
DMSG("wait for a DISC PDU\n");
do {
if (2 > link.read(headerBuf, headerBufLen)) {
return -1;
}
type = getPType(headerBuf);
if (PDU_DISC == type) {
break;
} else if (PDU_SYMM == type) {
if (!link.write(SYMM_PDU, sizeof(SYMM_PDU))) {
return -2;
}
} else {
return -3;
}
} while (1);
// Put DM PDU
DMSG("put a DM(Disconnect Mode) PDU to response the DISC PDU\n");
// ssap = getDSAP(headerBuf);
// dsap = getSSAP(headerBuf);
headerBuf[0] = (dsap << 2) + (PDU_DM >> 2);
headerBuf[1] = ((PDU_DM & 0x3) << 6) + ssap;
if (!link.write(headerBuf, 2)) {
return -2;
}
return 1;
}
int8_t LLCP::connect(uint16_t timeout)
{
uint8_t type;
mode = 0;
dsap = LLCP_DEFAULT_DSAP;
ssap = LLCP_DEFAULT_SSAP;
ns = 0;
nr = 0;
// try to get a SYMM PDU
if (2 > link.read(headerBuf, headerBufLen)) {
return -1;
}
type = getPType(headerBuf);
if (PDU_SYMM != type) {
return -1;
}
// put a CONNECT PDU
headerBuf[0] = (LLCP_DEFAULT_DSAP << 2) + (PDU_CONNECT >> 2);
headerBuf[1] = ((PDU_CONNECT & 0x03) << 6) + LLCP_DEFAULT_SSAP;
uint8_t body[] = " urn:nfc:sn:snep";
body[0] = 0x06;
body[1] = sizeof(body) - 2 - 1;
if (!link.write(headerBuf, 2, body, sizeof(body) - 1)) {
return -2;
}
// wait for a CC PDU
DMSG("wait for a CC PDU\n");
do {
if (2 > link.read(headerBuf, headerBufLen)) {
return -1;
}
type = getPType(headerBuf);
if (PDU_CC == type) {
break;
} else if (PDU_SYMM == type) {
if (!link.write(SYMM_PDU, sizeof(SYMM_PDU))) {
return -2;
}
} else {
return -3;
}
} while (1);
return 1;
}
int8_t LLCP::disconnect(uint16_t timeout)
{
uint8_t type;
// try to get a SYMM PDU
if (2 > link.read(headerBuf, headerBufLen)) {
return -1;
}
type = getPType(headerBuf);
if (PDU_SYMM != type) {
return -1;
}
// put a DISC PDU
headerBuf[0] = (LLCP_DEFAULT_DSAP << 2) + (PDU_DISC >> 2);
headerBuf[1] = ((PDU_DISC & 0x03) << 6) + LLCP_DEFAULT_SSAP;
if (!link.write(headerBuf, 2)) {
return -2;
}
// wait for a DM PDU
DMSG("wait for a DM PDU\n");
do {
if (2 > link.read(headerBuf, headerBufLen)) {
return -1;
}
type = getPType(headerBuf);
if (PDU_CC == type) {
break;
} else if (PDU_DM == type) {
if (!link.write(SYMM_PDU, sizeof(SYMM_PDU))) {
return -2;
}
} else {
return -3;
}
} while (1);
return 1;
}
bool LLCP::write(const uint8_t *header, uint8_t hlen, const uint8_t *body, uint8_t blen)
{
uint8_t type;
uint8_t buf[3];
if (mode) {
// Get a SYMM PDU
if (2 != link.read(buf, sizeof(buf))) {
return false;
}
}
if (headerBufLen < (hlen + 3)) {
return false;
}
for (int8_t i = hlen - 1; i >= 0; i--) {
headerBuf[i + 3] = header[i];
}
headerBuf[0] = (dsap << 2) + (PDU_I >> 2);
headerBuf[1] = ((PDU_I & 0x3) << 6) + ssap;
headerBuf[2] = (ns << 4) + nr;
if (!link.write(headerBuf, 3 + hlen, body, blen)) {
return false;
}
ns++;
// Get a RR PDU
int16_t status;
do {
status = link.read(headerBuf, headerBufLen);
if (2 > status) {
return false;
}
type = getPType(headerBuf);
if (PDU_RR == type) {
break;
} else if (PDU_SYMM == type) {
if (!link.write(SYMM_PDU, sizeof(SYMM_PDU))) {
return false;
}
} else {
return false;
}
} while (1);
if (!link.write(SYMM_PDU, sizeof(SYMM_PDU))) {
return false;
}
return true;
}
int16_t LLCP::read(uint8_t *buf, uint8_t length)
{
uint8_t type;
int16_t status;
// Get INFO PDU
do {
status = link.read(buf, length);
if (2 > status) {
return -1;
}
type = getPType(buf);
if (PDU_I == type) {
break;
} else if (PDU_SYMM == type) {
if (!link.write(SYMM_PDU, sizeof(SYMM_PDU))) {
return -2;
}
} else {
return -3;
}
} while (1);
uint8_t len = status - 3;
ssap = getDSAP(buf);
dsap = getSSAP(buf);
headerBuf[0] = (dsap << 2) + (PDU_RR >> 2);
headerBuf[1] = ((PDU_RR & 0x3) << 6) + ssap;
headerBuf[2] = (buf[2] >> 4) + 1;
if (!link.write(headerBuf, 3)) {
return -2;
}
for (uint8_t i = 0; i < len; i++) {
buf[i] = buf[i + 3];
}
nr++;
return len;
}