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Ledger/Speculos TCP APDU transport (#288)
* Ledger/Speculos TCP transport * Ledger transport option documentation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| package ledger | ||
|
|
||
| import ( | ||
| "encoding/binary" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| "strings" | ||
| ) | ||
|
|
||
| type TCPTransport struct { | ||
| Addr string | ||
| Model string | ||
| } | ||
|
|
||
| func (t *TCPTransport) Enumerate() ([]*DeviceInfo, error) { | ||
| var dev *LedgerDeviceInfo | ||
| if t.Model != "" { | ||
| for _, d := range ledgerDevices { | ||
| if strings.EqualFold(t.Model, d.ID) { | ||
| dev = d | ||
| break | ||
| } | ||
| } | ||
| if dev == nil { | ||
| return nil, fmt.Errorf("ledger: unknown model") | ||
| } | ||
| } else { | ||
| dev = &ledgerNanoS | ||
| } | ||
| return []*DeviceInfo{ | ||
| { | ||
| Path: t.Addr, | ||
| DeviceInfo: dev, | ||
| }, | ||
| }, nil | ||
| } | ||
|
|
||
| func (t *TCPTransport) Open(path string) (Exchanger, error) { | ||
| conn, err := net.Dial("tcp", path) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("tcp: %w", err) | ||
| } | ||
| return &tcpRoundTripper{conn: conn}, nil | ||
| } | ||
|
|
||
| type tcpRoundTripper struct { | ||
| conn net.Conn | ||
| } | ||
|
|
||
| func (t *tcpRoundTripper) Exchange(req *APDUCommand) (*APDUResponse, error) { | ||
| data := req.Bytes() | ||
| //log.Printf("> %s", hex.EncodeToString(data)) | ||
|
|
||
| buf := make([]byte, len(data)+4) | ||
| binary.BigEndian.PutUint32(buf, uint32(len(data))) | ||
| copy(buf[4:], data) | ||
|
|
||
| if _, err := t.conn.Write(buf); err != nil { | ||
| return nil, fmt.Errorf("tcp: %w", err) | ||
| } | ||
|
|
||
| var ln [4]byte | ||
| if _, err := io.ReadFull(t.conn, ln[:]); err != nil { | ||
| return nil, fmt.Errorf("tcp: %w", err) | ||
| } | ||
| buf = make([]byte, int(binary.BigEndian.Uint32(ln[:])+2)) | ||
| if _, err := io.ReadFull(t.conn, buf); err != nil { | ||
| return nil, fmt.Errorf("tcp: %w", err) | ||
| } | ||
| //log.Printf("< %s", hex.EncodeToString(buf)) | ||
| res := parseAPDUResponse(buf) | ||
| if res == nil { | ||
| return nil, errors.New("ledger: error parsing APDU response") | ||
| } | ||
| return res, nil | ||
| } | ||
|
|
||
| func (t *tcpRoundTripper) Close() error { return t.conn.Close() } | ||
|
|
||
| var _ Transport = (*TCPTransport)(nil) |
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