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package cvend
import (
"bytes"
"encoding/binary"
"encoding/hex"
"errors"
"log"
"os"
"slices"
"time"
"pm3.dev/ipp"
)
const Path = "/dev/ttymxc3"
func OpenIPP(handler ipp.Handler) (ipp.Session, error) {
return ipp.Open(Path, handler)
}
func LogIPP(msgType byte, msgData []byte) {
switch msgType {
case 0x07:
log.Printf("Heartbeat(%s)", hex.EncodeToString(msgData))
case 0x0f:
log.Printf("Startup(%s)", hex.EncodeToString(msgData))
case 0xed:
if len(msgData) == 0 {
log.Printf("Log()")
} else {
log.Printf("Log(%d) %s", msgData[0], string(bytes.TrimSuffix(msgData[1:], []byte{0})))
}
case 0xb1:
if len(msgData) < 9 {
log.Printf("ISORead(short)\n%s", hex.Dump(msgData))
} else {
uid := msgData[2:9]
log.Printf("ISORead(uid %s)\n%s", hex.EncodeToString(uid), hex.Dump(msgData))
}
case 0xb3:
log.Printf("ISOCardReleased\n%s", hex.Dump(msgData))
case 0xb5:
log.Printf("APDUProxReply\n%s", hex.Dump(msgData))
case 0xb9:
if len(msgData) < 11 {
log.Printf("DESFireRead(short)\n%s", hex.Dump(msgData))
} else {
uid := msgData[4:11]
log.Printf("DESFireRead(uid %s)\n%s", hex.EncodeToString(uid), hex.Dump(msgData))
}
case 0xbb:
log.Printf("DESFireCardRemoved\n%s", hex.Dump(msgData))
case 0xbe:
if len(msgData) < 22 || len(msgData) < 22+int(msgData[21]) {
log.Printf("UnhandledCard(short)\n%s", hex.Dump(msgData))
} else {
_ = msgData[:11] // unknown
uid := msgData[11:18]
atqa := binary.LittleEndian.Uint16(msgData[18:20])
sak := msgData[20]
atrLen := msgData[21]
atr := msgData[22 : 22+atrLen]
_ = msgData[22+atrLen:] // unknown
log.Printf("UnhandledCard(uid %s atqa 0x%04x sak %02x atr %s)\n%s", hex.EncodeToString(uid), atqa, sak, hex.EncodeToString(atr), hex.Dump(msgData))
}
case 0xd1:
log.Printf("EMVStatus\n%s", hex.Dump(msgData))
default:
log.Printf("ipp %02x\n%s", msgType, hex.Dump(msgData))
}
}
var (
ErrCardRemoved = errors.New("card removed")
)
type Device struct {
ipp.Session
closed chan struct{}
statusReply chan []byte // 0x05
heartbeat chan []byte // 0x07
startup chan []byte // 0x0f
desFireRead chan []byte // 0xb9
desFireCardRemoved chan []byte // 0xbb
desFireCommandReply chan []byte // 0xbd
unhandledCard chan []byte // 0xbe
proxCardFunctionReply chan []byte // 0xe5
}
func Open() (*Device, error) {
d := &Device{
statusReply: make(chan []byte),
heartbeat: make(chan []byte),
startup: make(chan []byte),
desFireRead: make(chan []byte),
desFireCardRemoved: make(chan []byte),
desFireCommandReply: make(chan []byte),
unhandledCard: make(chan []byte),
proxCardFunctionReply: make(chan []byte),
}
var err error
d.Session, err = ipp.Open(Path, func(msgType byte, msgData []byte) {
// if channel receiver waiting, deliver data to it, else log
var ch chan []byte
switch msgType {
case 0x05:
ch = d.statusReply
case 0x07:
ch = d.heartbeat
case 0x0f:
ch = d.startup
case 0xb9:
ch = d.desFireRead
case 0xbb:
ch = d.desFireCardRemoved
case 0xbd:
ch = d.desFireCommandReply
case 0xbe:
ch = d.unhandledCard
case 0xe5:
ch = d.proxCardFunctionReply
}
select {
case ch <- slices.Clone(msgData):
return
default:
}
switch msgType {
case 0x07:
log.Printf("Heartbeat(%s)", hex.EncodeToString(msgData))
case 0xed:
log.Printf("Log(%d) %s", msgData[0], string(bytes.TrimSuffix(msgData[1:], []byte{0})))
default:
log.Printf("ipp %02x\n%s", msgType, hex.Dump(msgData))
}
})
if err != nil {
return nil, err
}
return d, err
}
func (d *Device) Close() error {
close(d.closed)
return d.Session.Close()
}
func (d *Device) AwaitStatus() ([]byte, error) {
for {
if err := d.SendIPP(0x04, nil); err != nil { // Status
return nil, err
}
select {
case <-d.closed:
return nil, os.ErrClosed
case status := <-d.statusReply:
return status, nil
case <-d.startup:
// retry
case <-time.After(1 * time.Second):
// retry
}
}
}
func (d *Device) ProxCardFunction(cardType uint16, enable bool) ([]byte, error) {
var payload [4]byte
binary.BigEndian.PutUint16(payload[0:2], cardType)
payload[2] = 1
if enable {
payload[3] = 1
}
if err := d.SendIPP(0xe4, payload[:]); err != nil {
return nil, err
}
select {
case resp := <-d.proxCardFunctionReply:
return resp, nil
case <-d.closed:
return nil, os.ErrClosed
}
}
func (d *Device) AwaitCard() (Card, error) {
select {
case data := <-d.desFireRead:
if len(data) < 11 {
log.Printf("short desfire read: %s", hex.EncodeToString(data))
return nil, errors.New("invalid desfire read")
}
c := &DESFireCard{
UID: data[4:],
d: d,
removed: make(chan struct{}),
}
go func() {
<-d.desFireCardRemoved
close(c.removed)
}()
return c, nil
case <-d.closed:
return nil, os.ErrClosed
}
}
type Card interface {
Release() error
}
type DESFireCard struct {
UID []byte
d *Device
removed chan struct{}
}
func (c *DESFireCard) AwaitRemoved() {
<-c.removed
}
func (c *DESFireCard) Release() error {
select {
case <-c.removed:
return ErrCardRemoved
default:
}
return c.d.SendIPP(0x32, nil)
}
func (c *DESFireCard) Command(cmd byte, data []byte) ([]byte, error) {
select {
case <-c.removed:
return nil, ErrCardRemoved
default:
}
if err := c.d.SendIPP(0xbc, append([]byte{cmd}, data...)); err != nil {
return nil, err
}
select {
case <-c.removed:
return nil, ErrCardRemoved
case <-c.d.closed:
return nil, os.ErrClosed
case data := <-c.d.desFireCommandReply:
return data, nil
}
}
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