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