2 * Copyright (c) 2018 Yubico AB. All rights reserved.
3 * Use of this source code is governed by a BSD-style
4 * license that can be found in the LICENSE file.
12 uint32_t cid; /* channel id */
19 uint8_t data[CTAP_MAX_REPORT_LEN - CTAP_INIT_HEADER_LEN];
23 uint8_t data[CTAP_MAX_REPORT_LEN - CTAP_CONT_HEADER_LEN];
29 #define MIN(x, y) ((x) > (y) ? (y) : (x))
33 tx_pkt(fido_dev_t *d, const void *pkt, size_t len, int *ms)
38 if (fido_time_now(&ts) != 0)
41 n = d->io.write(d->io_handle, pkt, len);
43 if (fido_time_delta(&ts, ms) != 0)
50 tx_empty(fido_dev_t *d, uint8_t cmd, int *ms)
53 unsigned char pkt[sizeof(*fp) + 1];
54 const size_t len = d->tx_len + 1;
57 memset(&pkt, 0, sizeof(pkt));
58 fp = (struct frame *)(pkt + 1);
60 fp->body.init.cmd = CTAP_FRAME_INIT | cmd;
62 if (len > sizeof(pkt) || (n = tx_pkt(d, pkt, len, ms)) < 0 ||
70 tx_preamble(fido_dev_t *d, uint8_t cmd, const void *buf, size_t count, int *ms)
73 unsigned char pkt[sizeof(*fp) + 1];
74 const size_t len = d->tx_len + 1;
77 if (d->tx_len - CTAP_INIT_HEADER_LEN > sizeof(fp->body.init.data))
80 memset(&pkt, 0, sizeof(pkt));
81 fp = (struct frame *)(pkt + 1);
83 fp->body.init.cmd = CTAP_FRAME_INIT | cmd;
84 fp->body.init.bcnth = (count >> 8) & 0xff;
85 fp->body.init.bcntl = count & 0xff;
86 count = MIN(count, d->tx_len - CTAP_INIT_HEADER_LEN);
87 memcpy(&fp->body.init.data, buf, count);
89 if (len > sizeof(pkt) || (n = tx_pkt(d, pkt, len, ms)) < 0 ||
97 tx_frame(fido_dev_t *d, uint8_t seq, const void *buf, size_t count, int *ms)
100 unsigned char pkt[sizeof(*fp) + 1];
101 const size_t len = d->tx_len + 1;
104 if (d->tx_len - CTAP_CONT_HEADER_LEN > sizeof(fp->body.cont.data))
107 memset(&pkt, 0, sizeof(pkt));
108 fp = (struct frame *)(pkt + 1);
110 fp->body.cont.seq = seq;
111 count = MIN(count, d->tx_len - CTAP_CONT_HEADER_LEN);
112 memcpy(&fp->body.cont.data, buf, count);
114 if (len > sizeof(pkt) || (n = tx_pkt(d, pkt, len, ms)) < 0 ||
122 tx(fido_dev_t *d, uint8_t cmd, const unsigned char *buf, size_t count, int *ms)
126 if ((sent = tx_preamble(d, cmd, buf, count, ms)) == 0) {
127 fido_log_debug("%s: tx_preamble", __func__);
131 for (uint8_t seq = 0; sent < count; sent += n) {
133 fido_log_debug("%s: seq & 0x80", __func__);
136 if ((n = tx_frame(d, seq++, buf + sent, count - sent,
138 fido_log_debug("%s: tx_frame", __func__);
147 transport_tx(fido_dev_t *d, uint8_t cmd, const void *buf, size_t count, int *ms)
152 if (fido_time_now(&ts) != 0)
155 n = d->transport.tx(d, cmd, buf, count);
157 if (fido_time_delta(&ts, ms) != 0)
164 fido_tx(fido_dev_t *d, uint8_t cmd, const void *buf, size_t count, int *ms)
166 fido_log_debug("%s: dev=%p, cmd=0x%02x", __func__, (void *)d, cmd);
167 fido_log_xxd(buf, count, "%s", __func__);
169 if (d->transport.tx != NULL)
170 return (transport_tx(d, cmd, buf, count, ms));
171 if (d->io_handle == NULL || d->io.write == NULL || count > UINT16_MAX) {
172 fido_log_debug("%s: invalid argument", __func__);
176 return (count == 0 ? tx_empty(d, cmd, ms) : tx(d, cmd, buf, count, ms));
180 rx_frame(fido_dev_t *d, struct frame *fp, int *ms)
185 memset(fp, 0, sizeof(*fp));
187 if (fido_time_now(&ts) != 0)
190 if (d->rx_len > sizeof(*fp) || (n = d->io.read(d->io_handle,
191 (unsigned char *)fp, d->rx_len, *ms)) < 0 || (size_t)n != d->rx_len)
194 return (fido_time_delta(&ts, ms));
198 rx_preamble(fido_dev_t *d, uint8_t cmd, struct frame *fp, int *ms)
201 if (rx_frame(d, fp, ms) < 0)
206 } while (fp->cid != d->cid || (fp->cid == d->cid &&
207 fp->body.init.cmd == (CTAP_FRAME_INIT | CTAP_KEEPALIVE)));
209 if (d->rx_len > sizeof(*fp))
212 fido_log_xxd(fp, d->rx_len, "%s", __func__);
214 fp->body.init.cmd = (CTAP_FRAME_INIT | cmd);
217 if (fp->cid != d->cid || fp->body.init.cmd != (CTAP_FRAME_INIT | cmd)) {
218 fido_log_debug("%s: cid (0x%x, 0x%x), cmd (0x%02x, 0x%02x)",
219 __func__, fp->cid, d->cid, fp->body.init.cmd, cmd);
227 rx(fido_dev_t *d, uint8_t cmd, unsigned char *buf, size_t count, int *ms)
230 size_t r, payload_len, init_data_len, cont_data_len;
232 if (d->rx_len <= CTAP_INIT_HEADER_LEN ||
233 d->rx_len <= CTAP_CONT_HEADER_LEN)
236 init_data_len = d->rx_len - CTAP_INIT_HEADER_LEN;
237 cont_data_len = d->rx_len - CTAP_CONT_HEADER_LEN;
239 if (init_data_len > sizeof(f.body.init.data) ||
240 cont_data_len > sizeof(f.body.cont.data))
243 if (rx_preamble(d, cmd, &f, ms) < 0) {
244 fido_log_debug("%s: rx_preamble", __func__);
248 payload_len = (size_t)((f.body.init.bcnth << 8) | f.body.init.bcntl);
249 fido_log_debug("%s: payload_len=%zu", __func__, payload_len);
251 if (count < payload_len) {
252 fido_log_debug("%s: count < payload_len", __func__);
256 if (payload_len < init_data_len) {
257 memcpy(buf, f.body.init.data, payload_len);
258 return ((int)payload_len);
261 memcpy(buf, f.body.init.data, init_data_len);
264 for (int seq = 0; r < payload_len; seq++) {
265 if (rx_frame(d, &f, ms) < 0) {
266 fido_log_debug("%s: rx_frame", __func__);
270 fido_log_xxd(&f, d->rx_len, "%s", __func__);
273 f.body.cont.seq = (uint8_t)seq;
276 if (f.cid != d->cid || f.body.cont.seq != seq) {
277 fido_log_debug("%s: cid (0x%x, 0x%x), seq (%d, %d)",
278 __func__, f.cid, d->cid, f.body.cont.seq, seq);
282 if (payload_len - r > cont_data_len) {
283 memcpy(buf + r, f.body.cont.data, cont_data_len);
286 memcpy(buf + r, f.body.cont.data, payload_len - r);
287 r += payload_len - r; /* break */
295 transport_rx(fido_dev_t *d, uint8_t cmd, void *buf, size_t count, int *ms)
300 if (fido_time_now(&ts) != 0)
303 n = d->transport.rx(d, cmd, buf, count, *ms);
305 if (fido_time_delta(&ts, ms) != 0)
312 fido_rx(fido_dev_t *d, uint8_t cmd, void *buf, size_t count, int *ms)
316 fido_log_debug("%s: dev=%p, cmd=0x%02x, ms=%d", __func__, (void *)d,
319 if (d->transport.rx != NULL)
320 return (transport_rx(d, cmd, buf, count, ms));
321 if (d->io_handle == NULL || d->io.read == NULL || count > UINT16_MAX) {
322 fido_log_debug("%s: invalid argument", __func__);
325 if ((n = rx(d, cmd, buf, count, ms)) >= 0)
326 fido_log_xxd(buf, (size_t)n, "%s", __func__);
332 fido_rx_cbor_status(fido_dev_t *d, int *ms)
334 unsigned char reply[FIDO_MAXMSG];
337 if ((reply_len = fido_rx(d, CTAP_CMD_CBOR, &reply, sizeof(reply),
338 ms)) < 0 || (size_t)reply_len < 1) {
339 fido_log_debug("%s: fido_rx", __func__);
340 return (FIDO_ERR_RX);