1/*-
2 * send_recv.c
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 * Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com>
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $Id: send_recv.c,v 1.2 2003/05/21 22:40:30 max Exp $
31 */
32
33#include <sys/types.h>
34#include <sys/socket.h>
35#include <sys/time.h>
36#include <sys/endian.h>
37#include <assert.h>
38#include <errno.h>
39#include <netgraph/bluetooth/include/ng_hci.h>
40#include <string.h>
41#include <unistd.h>
42#include "hccontrol.h"
43
44/* Send HCI request to the unit */
45int
46hci_request(int s, int opcode, char const *cp, int cp_size, char *rp, int *rp_size)
47{
48	char			 buffer[512];
49	int			 n;
50	ng_hci_cmd_pkt_t	*c = (ng_hci_cmd_pkt_t *) buffer;
51	ng_hci_event_pkt_t	*e = (ng_hci_event_pkt_t *) buffer;
52
53	assert(rp != NULL);
54	assert(rp_size != NULL);
55	assert(*rp_size > 0);
56
57	c->type = NG_HCI_CMD_PKT;
58	c->opcode = (uint16_t) opcode;
59	c->opcode = htole16(c->opcode);
60
61	if (cp != NULL) {
62		assert(0 < cp_size && cp_size <= NG_HCI_CMD_PKT_SIZE);
63
64		c->length = (uint8_t) cp_size;
65		memcpy(buffer + sizeof(*c), cp, cp_size);
66	} else
67		c->length = 0;
68
69	if (hci_send(s, buffer, sizeof(*c) + cp_size) == ERROR)
70		return (ERROR);
71
72again:
73	n = sizeof(buffer);
74	if (hci_recv(s, buffer, &n) == ERROR)
75		return (ERROR);
76
77	if (n < sizeof(*e)) {
78		errno = EMSGSIZE;
79		return (ERROR);
80	}
81
82	if (e->type != NG_HCI_EVENT_PKT) {
83		errno = EIO;
84		return (ERROR);
85	}
86
87	switch (e->event) {
88	case NG_HCI_EVENT_COMMAND_COMPL: {
89		ng_hci_command_compl_ep	*cc =
90				(ng_hci_command_compl_ep *)(e + 1);
91
92		cc->opcode = le16toh(cc->opcode);
93
94		if (cc->opcode == 0x0000 || cc->opcode != opcode)
95			goto again;
96
97		n -= (sizeof(*e) + sizeof(*cc));
98		if (n < *rp_size)
99			*rp_size = n;
100
101		memcpy(rp, buffer + sizeof(*e) + sizeof(*cc), *rp_size);
102		} break;
103
104	case NG_HCI_EVENT_COMMAND_STATUS: {
105		ng_hci_command_status_ep	*cs =
106				(ng_hci_command_status_ep *)(e + 1);
107
108		cs->opcode = le16toh(cs->opcode);
109
110		if (cs->opcode == 0x0000 || cs->opcode != opcode)
111			goto again;
112
113		*rp_size = 1;
114		*rp = cs->status;
115		} break;
116
117	default:
118		goto again;
119	}
120
121	return (OK);
122} /* hci_request */
123
124/* Send simple HCI request - Just HCI command packet (no parameters) */
125int
126hci_simple_request(int s, int opcode, char *rp, int *rp_size)
127{
128	return (hci_request(s, opcode, NULL, 0, rp, rp_size));
129} /* hci_simple_request */
130
131/* Send HCI data to the unit */
132int
133hci_send(int s, char const *buffer, int size)
134{
135	assert(buffer != NULL);
136	assert(size >= sizeof(ng_hci_cmd_pkt_t));
137	assert(size <= sizeof(ng_hci_cmd_pkt_t) + NG_HCI_CMD_PKT_SIZE);
138
139	if (send(s, buffer, size, 0) < 0)
140		return (ERROR);
141
142	return (OK);
143} /* hci_send */
144
145/* Receive HCI data from the unit */
146int
147hci_recv(int s, char *buffer, int *size)
148{
149	struct timeval	tv;
150	fd_set		rfd;
151	int		n;
152
153	assert(buffer != NULL);
154	assert(size != NULL);
155	assert(*size > sizeof(ng_hci_event_pkt_t));
156
157again:
158	FD_ZERO(&rfd);
159	FD_SET(s, &rfd);
160
161	tv.tv_sec = timeout;
162	tv.tv_usec = 0;
163
164	n = select(s + 1, &rfd, NULL, NULL, &tv);
165	if (n <= 0) {
166		if (n < 0) {
167			if (errno == EINTR)
168				goto again;
169		} else
170			errno = ETIMEDOUT;
171
172		return (ERROR);
173	}
174
175	assert(FD_ISSET(s, &rfd));
176
177	n = recv(s, buffer, *size, 0);
178	if (n < 0)
179		return (ERROR);
180
181	*size = n;
182
183	return (OK);
184} /* hci_recv */
185
186