/libfido2/src/io.c

Source
/*
 * Copyright (c) 2018-2022 Yubico AB. All rights reserved.
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include "fido.h"
#include "packed.h"

PACKED_TYPE(frame_t,
struct frame {
        uint32_t cid; /* channel id */
        union {
                uint8_t type;
                struct {
                        uint8_t cmd;
                        uint8_t bcnth;
                        uint8_t bcntl;
                        uint8_t data[CTAP_MAX_REPORT_LEN - CTAP_INIT_HEADER_LEN];
                } init;
                struct {
                        uint8_t seq;
                        uint8_t data[CTAP_MAX_REPORT_LEN - CTAP_CONT_HEADER_LEN];
                } cont;
        } body;
})

#ifndef MIN
#define MIN(x, y) ((x) > (y) ? (y) : (x))
#endif

static int
tx_pkt(fido_dev_t *d, const void *pkt, size_t len, int *ms)
{
        struct timespec ts;
        int n;

        if (fido_time_now(&ts) != 0)
                return (-1);

        n = d->io.write(d->io_handle, pkt, len);

        if (fido_time_delta(&ts, ms) != 0)
                return (-1);

        return (n);
}

static int
tx_empty(fido_dev_t *d, uint8_t cmd, int *ms)
{
        struct frame    *fp;
        unsigned char    pkt[sizeof(*fp) + 1];
        const size_t     len = d->tx_len + 1;
        int              n;

        memset(&pkt, 0, sizeof(pkt));
        fp = (struct frame *)(pkt + 1);
        fp->cid = d->cid;
        fp->body.init.cmd = CTAP_FRAME_INIT | cmd;

        if (len > sizeof(pkt) || (n = tx_pkt(d, pkt, len, ms)) < 0 ||
            (size_t)n != len)
                return (-1);

        return (0);
}

static size_t
tx_preamble(fido_dev_t *d, uint8_t cmd, const void *buf, size_t count, int *ms)
{
        struct frame    *fp;
        unsigned char    pkt[sizeof(*fp) + 1];
        const size_t     len = d->tx_len + 1;
        int              n;

        if (d->tx_len - CTAP_INIT_HEADER_LEN > sizeof(fp->body.init.data))
                return (0);

        memset(&pkt, 0, sizeof(pkt));
        fp = (struct frame *)(pkt + 1);
        fp->cid = d->cid;
        fp->body.init.cmd = CTAP_FRAME_INIT | cmd;
        fp->body.init.bcnth = (count >> 8) & 0xff;
        fp->body.init.bcntl = count & 0xff;
        count = MIN(count, d->tx_len - CTAP_INIT_HEADER_LEN);
        memcpy(&fp->body.init.data, buf, count);

        if (len > sizeof(pkt) || (n = tx_pkt(d, pkt, len, ms)) < 0 ||
            (size_t)n != len)
                return (0);

        return (count);
}

static size_t
tx_frame(fido_dev_t *d, uint8_t seq, const void *buf, size_t count, int *ms)
{
        struct frame    *fp;
        unsigned char    pkt[sizeof(*fp) + 1];
        const size_t     len = d->tx_len + 1;
        int              n;

        if (d->tx_len - CTAP_CONT_HEADER_LEN > sizeof(fp->body.cont.data))
                return (0);

        memset(&pkt, 0, sizeof(pkt));
        fp = (struct frame *)(pkt + 1);
        fp->cid = d->cid;
        fp->body.cont.seq = seq;
        count = MIN(count, d->tx_len - CTAP_CONT_HEADER_LEN);
        memcpy(&fp->body.cont.data, buf, count);

        if (len > sizeof(pkt) || (n = tx_pkt(d, pkt, len, ms)) < 0 ||
            (size_t)n != len)
                return (0);

        return (count);
}

static int
tx(fido_dev_t *d, uint8_t cmd, const unsigned char *buf, size_t count, int *ms)
{
        size_t n, sent;

        if ((sent = tx_preamble(d, cmd, buf, count, ms)) == 0) {
                fido_log_debug("%s: tx_preamble", __func__);
                return (-1);
        }

        for (uint8_t seq = 0; sent < count; sent += n) {
                if (seq & 0x80) {
                        fido_log_debug("%s: seq & 0x80", __func__);
                        return (-1);
                }
                if ((n = tx_frame(d, seq++, buf + sent, count - sent,
                    ms)) == 0) {
                        fido_log_debug("%s: tx_frame", __func__);
                        return (-1);
                }
        }

        return (0);
}

static int
transport_tx(fido_dev_t *d, uint8_t cmd, const void *buf, size_t count, int *ms)
{
        struct timespec ts;
        int n;

        if (fido_time_now(&ts) != 0)
                return (-1);

        n = d->transport.tx(d, cmd, buf, count);

        if (fido_time_delta(&ts, ms) != 0)
                return (-1);

        return (n);
}

int
fido_tx(fido_dev_t *d, uint8_t cmd, const void *buf, size_t count, int *ms)
{
        fido_log_debug("%s: dev=%p, cmd=0x%02x", __func__, (void *)d, cmd);
        fido_log_xxd(buf, count, "%s", __func__);

        if (d->transport.tx != NULL)
                return (transport_tx(d, cmd, buf, count, ms));
        if (d->io_handle == NULL || d->io.write == NULL || count > UINT16_MAX) {
                fido_log_debug("%s: invalid argument", __func__);
                return (-1);
        }

        return (count == 0 ? tx_empty(d, cmd, ms) : tx(d, cmd, buf, count, ms));
}

static int
rx_frame(fido_dev_t *d, struct frame *fp, int *ms)
{
        struct timespec ts;
        int n;

        memset(fp, 0, sizeof(*fp));

        if (fido_time_now(&ts) != 0)
                return (-1);

        if (d->rx_len > sizeof(*fp) || (n = d->io.read(d->io_handle,
            (unsigned char *)fp, d->rx_len, *ms)) < 0 || (size_t)n != d->rx_len)
                return (-1);

        return (fido_time_delta(&ts, ms));
}

static int
rx_preamble(fido_dev_t *d, uint8_t cmd, struct frame *fp, int *ms)
{
        do {
                if (rx_frame(d, fp, ms) < 0)
                        return (-1);
#ifdef FIDO_FUZZ
                fp->cid = d->cid;
#endif
        } while (fp->cid != d->cid || (fp->cid == d->cid &&
            fp->body.init.cmd == (CTAP_FRAME_INIT | CTAP_KEEPALIVE)));

        if (d->rx_len > sizeof(*fp))
                return (-1);

        fido_log_xxd(fp, d->rx_len, "%s", __func__);
#ifdef FIDO_FUZZ
        fp->body.init.cmd = (CTAP_FRAME_INIT | cmd);
#endif

        if (fp->cid != d->cid || fp->body.init.cmd != (CTAP_FRAME_INIT | cmd)) {
                fido_log_debug("%s: cid (0x%x, 0x%x), cmd (0x%02x, 0x%02x)",
                    __func__, fp->cid, d->cid, fp->body.init.cmd, cmd);
                return (-1);
        }

        return (0);
}

static int
rx(fido_dev_t *d, uint8_t cmd, unsigned char *buf, size_t count, int *ms)
{
        struct frame f;
        size_t r, payload_len, init_data_len, cont_data_len;

        if (d->rx_len <= CTAP_INIT_HEADER_LEN ||
            d->rx_len <= CTAP_CONT_HEADER_LEN)
                return (-1);

        init_data_len = d->rx_len - CTAP_INIT_HEADER_LEN;
        cont_data_len = d->rx_len - CTAP_CONT_HEADER_LEN;

        if (init_data_len > sizeof(f.body.init.data) ||
            cont_data_len > sizeof(f.body.cont.data))
                return (-1);

        if (rx_preamble(d, cmd, &f, ms) < 0) {
                fido_log_debug("%s: rx_preamble", __func__);
                return (-1);
        }

        payload_len = (size_t)((f.body.init.bcnth << 8) | f.body.init.bcntl);
        fido_log_debug("%s: payload_len=%zu", __func__, payload_len);

        if (count < payload_len) {
                fido_log_debug("%s: count < payload_len", __func__);
                return (-1);
        }

        if (payload_len < init_data_len) {
                memcpy(buf, f.body.init.data, payload_len);
                return ((int)payload_len);
        }

        memcpy(buf, f.body.init.data, init_data_len);
        r = init_data_len;

        for (int seq = 0; r < payload_len; seq++) {
                if (rx_frame(d, &f, ms) < 0) {
                        fido_log_debug("%s: rx_frame", __func__);
                        return (-1);
                }

                fido_log_xxd(&f, d->rx_len, "%s", __func__);
#ifdef FIDO_FUZZ
                f.cid = d->cid;
                f.body.cont.seq = (uint8_t)seq;
#endif

                if (f.cid != d->cid || f.body.cont.seq != seq) {
                        fido_log_debug("%s: cid (0x%x, 0x%x), seq (%d, %d)",
                            __func__, f.cid, d->cid, f.body.cont.seq, seq);
                        return (-1);
                }

                if (payload_len - r > cont_data_len) {
                        memcpy(buf + r, f.body.cont.data, cont_data_len);
                        r += cont_data_len;
                } else {
                        memcpy(buf + r, f.body.cont.data, payload_len - r);
                        r += payload_len - r; /* break */
                }
        }

        return ((int)r);
}

static int
transport_rx(fido_dev_t *d, uint8_t cmd, void *buf, size_t count, int *ms)
{
        struct timespec ts;
        int n;

        if (fido_time_now(&ts) != 0)
                return (-1);

        n = d->transport.rx(d, cmd, buf, count, *ms);

        if (fido_time_delta(&ts, ms) != 0)
                return (-1);

        return (n);
}

int
fido_rx(fido_dev_t *d, uint8_t cmd, void *buf, size_t count, int *ms)
{
        int n;

        fido_log_debug("%s: dev=%p, cmd=0x%02x, ms=%d", __func__, (void *)d,
            cmd, *ms);

        if (d->transport.rx != NULL)
                return (transport_rx(d, cmd, buf, count, ms));
        if (d->io_handle == NULL || d->io.read == NULL || count > UINT16_MAX) {
                fido_log_debug("%s: invalid argument", __func__);
                return (-1);
        }
        if ((n = rx(d, cmd, buf, count, ms)) >= 0)
                fido_log_xxd(buf, (size_t)n, "%s", __func__);

        return (n);
}

int
fido_rx_cbor_status(fido_dev_t *d, int *ms)
{
        unsigned char   *msg;
        int              msglen;
        int              r;

        if ((msg = malloc(FIDO_MAXMSG)) == NULL) {
                r = FIDO_ERR_INTERNAL;
                goto out;
        }

        if ((msglen = fido_rx(d, CTAP_CMD_CBOR, msg, FIDO_MAXMSG, ms)) < 0 ||
            (size_t)msglen < 1) {
                fido_log_debug("%s: fido_rx", __func__);
                r = FIDO_ERR_RX;
                goto out;
        }

        r = msg[0];
out:
        freezero(msg, FIDO_MAXMSG);

        return (r);
}

Coverage Report

Created: 2025-10-04 18:33

Line	Count	Source
1		/*
2		* Copyright (c) 2018-2022 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.
5		* SPDX-License-Identifier: BSD-2-Clause
6		*/
7
8		#include "fido.h"
9		#include "packed.h"
10
11		PACKED_TYPE(frame_t,
12		struct frame {
13		uint32_t cid; /* channel id */
14		union {
15		uint8_t type;
16		struct {
17		uint8_t cmd;
18		uint8_t bcnth;
19		uint8_t bcntl;
20		uint8_t data[CTAP_MAX_REPORT_LEN - CTAP_INIT_HEADER_LEN];
21		} init;
22		struct {
23		uint8_t seq;
24		uint8_t data[CTAP_MAX_REPORT_LEN - CTAP_CONT_HEADER_LEN];
25		} cont;
26		} body;
27		})
28
29		#ifndef MIN
30	1.12M	#define MIN(x, y) ((x) > (y) ? (y) : (x))
31		#endif
32
33		static int
34		tx_pkt(fido_dev_t d, const void pkt, size_t len, int *ms)
35	1.14M	{
36	1.14M	struct timespec ts;
37	1.14M	int n;
38
39	1.14M	if (fido_time_now(&ts) != 0)
40	2.54k	return (-1);
41
42	1.14M	n = d->io.write(d->io_handle, pkt, len);
43
44	1.14M	if (fido_time_delta(&ts, ms) != 0)
45	5.00k	return (-1);
46
47	1.14M	return (n);
48	1.14M	}
49
50		static int
51		tx_empty(fido_dev_t d, uint8_t cmd, int ms)
52	25.1k	{
53	25.1k	struct frame *fp;
54	25.1k	unsigned char pkt[sizeof(*fp) + 1];
55	25.1k	const size_t len = d->tx_len + 1;
56	25.1k	int n;
57
58	25.1k	memset(&pkt, 0, sizeof(pkt));
59	25.1k	fp = (struct frame *)(pkt + 1);
60	25.1k	fp->cid = d->cid;
61	25.1k	fp->body.init.cmd = CTAP_FRAME_INIT \| cmd;
62
63	25.1k	if (len > sizeof(pkt) \|\| (n = tx_pkt(d, pkt, len, ms)) < 0 \|\|
64	25.1k	(size_t)n != len)
65	375	return (-1);
66
67	24.7k	return (0);
68	25.1k	}
69
70		static size_t
71		tx_preamble(fido_dev_t d, uint8_t cmd, const void buf, size_t count, int *ms)
72	579k	{
73	579k	struct frame *fp;
74	579k	unsigned char pkt[sizeof(*fp) + 1];
75	579k	const size_t len = d->tx_len + 1;
76	579k	int n;
77
78	579k	if (d->tx_len - CTAP_INIT_HEADER_LEN > sizeof(fp->body.init.data))
79	0	return (0);
80
81	579k	memset(&pkt, 0, sizeof(pkt));
82	579k	fp = (struct frame *)(pkt + 1);
83	579k	fp->cid = d->cid;
84	579k	fp->body.init.cmd = CTAP_FRAME_INIT \| cmd;
85	579k	fp->body.init.bcnth = (count >> 8) & 0xff;
86	579k	fp->body.init.bcntl = count & 0xff;
87	579k	count = MIN(count, d->tx_len - CTAP_INIT_HEADER_LEN);
88	579k	memcpy(&fp->body.init.data, buf, count);
89
90	579k	if (len > sizeof(pkt) \|\| (n = tx_pkt(d, pkt, len, ms)) < 0 \|\|
91	579k	(size_t)n != len)
92	5.80k	return (0);
93
94	573k	return (count);
95	579k	}
96
97		static size_t
98		tx_frame(fido_dev_t d, uint8_t seq, const void buf, size_t count, int *ms)
99	544k	{
100	544k	struct frame *fp;
101	544k	unsigned char pkt[sizeof(*fp) + 1];
102	544k	const size_t len = d->tx_len + 1;
103	544k	int n;
104
105	544k	if (d->tx_len - CTAP_CONT_HEADER_LEN > sizeof(fp->body.cont.data))
106	0	return (0);
107
108	544k	memset(&pkt, 0, sizeof(pkt));
109	544k	fp = (struct frame *)(pkt + 1);
110	544k	fp->cid = d->cid;
111	544k	fp->body.cont.seq = seq;
112	544k	count = MIN(count, d->tx_len - CTAP_CONT_HEADER_LEN);
113	544k	memcpy(&fp->body.cont.data, buf, count);
114
115	544k	if (len > sizeof(pkt) \|\| (n = tx_pkt(d, pkt, len, ms)) < 0 \|\|
116	544k	(size_t)n != len)
117	3.34k	return (0);
118
119	541k	return (count);
120	544k	}
121
122		static int
123		tx(fido_dev_t d, uint8_t cmd, const unsigned char buf, size_t count, int *ms)
124	579k	{
125	579k	size_t n, sent;
126
127	579k	if ((sent = tx_preamble(d, cmd, buf, count, ms)) == 0) {
128	5.80k	fido_log_debug("%s: tx_preamble", __func__);
129	5.80k	return (-1);
130	5.80k	}
131
132	1.11M	for (uint8_t seq = 0; sent < count; sent += n) {
133	545k	if (seq & 0x80) {
134	411	fido_log_debug("%s: seq & 0x80", __func__);
135	411	return (-1);
136	411	}
137	544k	if ((n = tx_frame(d, seq++, buf + sent, count - sent,
138	544k	ms)) == 0) {
139	3.34k	fido_log_debug("%s: tx_frame", __func__);
140	3.34k	return (-1);
141	3.34k	}
142	544k	}
143
144	570k	return (0);
145	573k	}
146
147		static int
148		transport_tx(fido_dev_t d, uint8_t cmd, const void buf, size_t count, int *ms)
149	22.6k	{
150	22.6k	struct timespec ts;
151	22.6k	int n;
152
153	22.6k	if (fido_time_now(&ts) != 0)
154	274	return (-1);
155
156	22.3k	n = d->transport.tx(d, cmd, buf, count);
157
158	22.3k	if (fido_time_delta(&ts, ms) != 0)
159	133	return (-1);
160
161	22.2k	return (n);
162	22.3k	}
163
164		int
165		fido_tx(fido_dev_t d, uint8_t cmd, const void buf, size_t count, int *ms)
166	627k	{
167	627k	fido_log_debug("%s: dev=%p, cmd=0x%02x", __func__, (void *)d, cmd);
168	627k	fido_log_xxd(buf, count, "%s", __func__);
169
170	627k	if (d->transport.tx != NULL)
171	22.6k	return (transport_tx(d, cmd, buf, count, ms));
172	605k	if (d->io_handle == NULL \|\| d->io.write == NULL \|\| count > UINT16_MAX) {
173	341	fido_log_debug("%s: invalid argument", __func__);
174	341	return (-1);
175	341	}
176
177	604k	return (count == 0 ? tx_empty(d, cmd, ms) : tx(d, cmd, buf, count, ms));
178	605k	}
179
180		static int
181		rx_frame(fido_dev_t d, struct frame fp, int *ms)
182	1.25M	{
183	1.25M	struct timespec ts;
184	1.25M	int n;
185
186	1.25M	memset(fp, 0, sizeof(*fp));
187
188	1.25M	if (fido_time_now(&ts) != 0)
189	1.68k	return (-1);
190
191	1.25M	if (d->rx_len > sizeof(*fp) \|\| (n = d->io.read(d->io_handle,
192	1.25M	(unsigned char )fp, d->rx_len, ms)) < 0 \|\| (size_t)n != d->rx_len)
193	202k	return (-1);
194
195	1.05M	return (fido_time_delta(&ts, ms));
196	1.25M	}
197
198		static int
199		rx_preamble(fido_dev_t d, uint8_t cmd, struct frame fp, int *ms)
200	580k	{
201	606k	do {
202	606k	if (rx_frame(d, fp, ms) < 0)
203	196k	return (-1);
204	409k	#ifdef FIDO_FUZZ
205	409k	fp->cid = d->cid;
206	409k	#endif
207	409k	} while (fp->cid != d->cid \|\| (fp->cid == d->cid &&
208	409k	fp->body.init.cmd == (CTAP_FRAME_INIT \| CTAP_KEEPALIVE)));
209
210	384k	if (d->rx_len > sizeof(*fp))
211	0	return (-1);
212
213	384k	fido_log_xxd(fp, d->rx_len, "%s", __func__);
214	384k	#ifdef FIDO_FUZZ
215	384k	fp->body.init.cmd = (CTAP_FRAME_INIT \| cmd);
216	384k	#endif
217
218	384k	if (fp->cid != d->cid \|\| fp->body.init.cmd != (CTAP_FRAME_INIT \| cmd)) {
219	0	fido_log_debug("%s: cid (0x%x, 0x%x), cmd (0x%02x, 0x%02x)",
220	0	__func__, fp->cid, d->cid, fp->body.init.cmd, cmd);
221	0	return (-1);
222	0	}
223
224	384k	return (0);
225	384k	}
226
227		static int
228		rx(fido_dev_t d, uint8_t cmd, unsigned char buf, size_t count, int *ms)
229	580k	{
230	580k	struct frame f;
231	580k	size_t r, payload_len, init_data_len, cont_data_len;
232
233	580k	if (d->rx_len <= CTAP_INIT_HEADER_LEN \|\|
234	580k	d->rx_len <= CTAP_CONT_HEADER_LEN)
235	0	return (-1);
236
237	580k	init_data_len = d->rx_len - CTAP_INIT_HEADER_LEN;
238	580k	cont_data_len = d->rx_len - CTAP_CONT_HEADER_LEN;
239
240	580k	if (init_data_len > sizeof(f.body.init.data) \|\|
241	580k	cont_data_len > sizeof(f.body.cont.data))
242	0	return (-1);
243
244	580k	if (rx_preamble(d, cmd, &f, ms) < 0) {
245	196k	fido_log_debug("%s: rx_preamble", __func__);
246	196k	return (-1);
247	196k	}
248
249	384k	payload_len = (size_t)((f.body.init.bcnth << 8) \| f.body.init.bcntl);
250	384k	fido_log_debug("%s: payload_len=%zu", __func__, payload_len);
251
252	384k	if (count < payload_len) {
253	37.6k	fido_log_debug("%s: count < payload_len", __func__);
254	37.6k	return (-1);
255	37.6k	}
256
257	346k	if (payload_len < init_data_len) {
258	188k	memcpy(buf, f.body.init.data, payload_len);
259	188k	return ((int)payload_len);
260	188k	}
261
262	157k	memcpy(buf, f.body.init.data, init_data_len);
263	157k	r = init_data_len;
264
265	797k	for (int seq = 0; r < payload_len; seq++) {
266	650k	if (rx_frame(d, &f, ms) < 0) {
267	9.67k	fido_log_debug("%s: rx_frame", __func__);
268	9.67k	return (-1);
269	9.67k	}
270
271	640k	fido_log_xxd(&f, d->rx_len, "%s", __func__);
272	640k	#ifdef FIDO_FUZZ
273	640k	f.cid = d->cid;
274	640k	f.body.cont.seq = (uint8_t)seq;
275	640k	#endif
276
277	640k	if (f.cid != d->cid \|\| f.body.cont.seq != seq) {
278	72	fido_log_debug("%s: cid (0x%x, 0x%x), seq (%d, %d)",
279	72	__func__, f.cid, d->cid, f.body.cont.seq, seq);
280	72	return (-1);
281	72	}
282
283	640k	if (payload_len - r > cont_data_len) {
284	503k	memcpy(buf + r, f.body.cont.data, cont_data_len);
285	503k	r += cont_data_len;
286	503k	} else {
287	136k	memcpy(buf + r, f.body.cont.data, payload_len - r);
288	136k	r += payload_len - r; /* break */
289	136k	}
290	640k	}
291
292	147k	return ((int)r);
293	157k	}
294
295		static int
296		transport_rx(fido_dev_t d, uint8_t cmd, void buf, size_t count, int *ms)
297	20.8k	{
298	20.8k	struct timespec ts;
299	20.8k	int n;
300
301	20.8k	if (fido_time_now(&ts) != 0)
302	175	return (-1);
303
304	20.7k	n = d->transport.rx(d, cmd, buf, count, *ms);
305
306	20.7k	if (fido_time_delta(&ts, ms) != 0)
307	472	return (-1);
308
309	20.2k	return (n);
310	20.7k	}
311
312		int
313		fido_rx(fido_dev_t d, uint8_t cmd, void buf, size_t count, int *ms)
314	601k	{
315	601k	int n;
316
317	601k	fido_log_debug("%s: dev=%p, cmd=0x%02x, ms=%d", __func__, (void *)d,
318	601k	cmd, *ms);
319
320	601k	if (d->transport.rx != NULL)
321	20.8k	return (transport_rx(d, cmd, buf, count, ms));
322	580k	if (d->io_handle == NULL \|\| d->io.read == NULL \|\| count > UINT16_MAX) {
323	0	fido_log_debug("%s: invalid argument", __func__);
324	0	return (-1);
325	0	}
326	580k	if ((n = rx(d, cmd, buf, count, ms)) >= 0)
327	336k	fido_log_xxd(buf, (size_t)n, "%s", __func__);
328
329	580k	return (n);
330	580k	}
331
332		int
333		fido_rx_cbor_status(fido_dev_t d, int ms)
334	12.4k	{
335	12.4k	unsigned char *msg;
336	12.4k	int msglen;
337	12.4k	int r;
338
339	12.4k	if ((msg = malloc(FIDO_MAXMSG)) == NULL) {
340	81	r = FIDO_ERR_INTERNAL;
341	81	goto out;
342	81	}
343
344	12.3k	if ((msglen = fido_rx(d, CTAP_CMD_CBOR, msg, FIDO_MAXMSG, ms)) < 0 \|\|
345	12.3k	(size_t)msglen < 1) {
346	7.65k	fido_log_debug("%s: fido_rx", __func__);
347	7.65k	r = FIDO_ERR_RX;
348	7.65k	goto out;
349	7.65k	}
350
351	4.73k	r = msg[0];
352	12.4k	out:
353	12.4k	freezero(msg, FIDO_MAXMSG);
354
355	12.4k	return (r);
356	4.73k	}