1/*
2 * Copyright (c) 2006 Paolo Abeni (Italy)
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote
15 * products derived from this software without specific prior written
16 * permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * Bluetooth sniffing API implementation for Linux platform
31 * By Paolo Abeni <paolo.abeni@email.it>
32 *
33 */
34#ifndef lint
35static const char rcsid[] _U_ =
36 "@(#) $Header: /tcpdump/master/libpcap/pcap-bt-linux.c,v 1.15 2008-07-01 07:05:54 guy Exp $ (LBL)";
37#endif
38
39#ifdef HAVE_CONFIG_H
40#include "config.h"
41#endif
42
43#include "pcap-int.h"
44#include "pcap-bt-linux.h"
45#include "pcap/bluetooth.h"
46
47#ifdef NEED_STRERROR_H
48#include "strerror.h"
49#endif
50
51#include <errno.h>
52#include <stdlib.h>
53#include <unistd.h>
54#include <fcntl.h>
55#include <string.h>
56#include <sys/ioctl.h>
57#include <sys/socket.h>
58#include <arpa/inet.h>
59
60#include <bluetooth/bluetooth.h>
61#include <bluetooth/hci.h>
62
63#define BT_IFACE "bluetooth"
64#define BT_CTRL_SIZE 128
65
66/* forward declaration */
67static int bt_activate(pcap_t *);
68static int bt_read_linux(pcap_t *, int , pcap_handler , u_char *);
69static int bt_inject_linux(pcap_t *, const void *, size_t);
70static int bt_setfilter_linux(pcap_t *, struct bpf_program *);
71static int bt_setdirection_linux(pcap_t *, pcap_direction_t);
72static int bt_stats_linux(pcap_t *, struct pcap_stat *);
73
74int
75bt_platform_finddevs(pcap_if_t **alldevsp, char *err_str)
76{
77 pcap_if_t *found_dev = *alldevsp;
78 struct hci_dev_list_req *dev_list;
79 struct hci_dev_req *dev_req;
80 int i, sock;
81 int ret = 0;
82
83 sock = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
84 if (sock < 0)
85 {
86 /* if bluetooth is not supported this this is not fatal*/
87 if (errno == EAFNOSUPPORT)
88 return 0;
89 snprintf(err_str, PCAP_ERRBUF_SIZE, "Can't open raw Bluetooth socket %d:%s",
90 errno, strerror(errno));
91 return -1;
92 }
93
94 dev_list = malloc(HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list));
95 if (!dev_list)
96 {
97 snprintf(err_str, PCAP_ERRBUF_SIZE, "Can't allocate %zu bytes for Bluetooth device list",
98 HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list));
99 ret = -1;
100 goto done;
101 }
102
103 dev_list->dev_num = HCI_MAX_DEV;
104
105 if (ioctl(sock, HCIGETDEVLIST, (void *) dev_list) < 0)
106 {
107 snprintf(err_str, PCAP_ERRBUF_SIZE, "Can't get Bluetooth device list via ioctl %d:%s",
108 errno, strerror(errno));
109 ret = -1;
110 goto free;
111 }
112
113 dev_req = dev_list->dev_req;
114 for (i = 0; i < dev_list->dev_num; i++, dev_req++) {
115 char dev_name[20], dev_descr[30];
116
117 snprintf(dev_name, 20, BT_IFACE"%d", dev_req->dev_id);
118 snprintf(dev_descr, 30, "Bluetooth adapter number %d", i);
119
120 if (pcap_add_if(&found_dev, dev_name, 0,
121 dev_descr, err_str) < 0)
122 {
123 ret = -1;
124 break;
125 }
126
127 }
128
129free:
130 free(dev_list);
131
132done:
133 close(sock);
134 return ret;
135}
136
137pcap_t *
138bt_create(const char *device, char *ebuf)
139{
140 pcap_t *p;
141
142 p = pcap_create_common(device, ebuf);
143 if (p == NULL)
144 return (NULL);
145
146 p->activate_op = bt_activate;
147 return (p);
148}
149
150static int
151bt_activate(pcap_t* handle)
152{
153 struct sockaddr_hci addr;
154 int opt;
155 int dev_id;
156 struct hci_filter flt;
157 int err = PCAP_ERROR;
158
159 /* get bt interface id */
160 if (sscanf(handle->opt.source, BT_IFACE"%d", &dev_id) != 1)
161 {
162 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
163 "Can't get Bluetooth device index from %s",
164 handle->opt.source);
165 return PCAP_ERROR;
166 }
167
168 /* Initialize some components of the pcap structure. */
169 handle->bufsize = handle->snapshot+BT_CTRL_SIZE+sizeof(pcap_bluetooth_h4_header);
170 handle->offset = BT_CTRL_SIZE;
171 handle->linktype = DLT_BLUETOOTH_HCI_H4_WITH_PHDR;
172
173 handle->read_op = bt_read_linux;
174 handle->inject_op = bt_inject_linux;
175 handle->setfilter_op = bt_setfilter_linux;
176 handle->setdirection_op = bt_setdirection_linux;
177 handle->set_datalink_op = NULL; /* can't change data link type */
178 handle->getnonblock_op = pcap_getnonblock_fd;
179 handle->setnonblock_op = pcap_setnonblock_fd;
180 handle->stats_op = bt_stats_linux;
181 handle->md.ifindex = dev_id;
182
183 /* Create HCI socket */
184 handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
185 if (handle->fd < 0) {
186 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't create raw socket %d:%s",
187 errno, strerror(errno));
188 return PCAP_ERROR;
189 }
190
191 handle->buffer = malloc(handle->bufsize);
192 if (!handle->buffer) {
193 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate dump buffer: %s",
194 pcap_strerror(errno));
195 goto close_fail;
196 }
197
198 opt = 1;
199 if (setsockopt(handle->fd, SOL_HCI, HCI_DATA_DIR, &opt, sizeof(opt)) < 0) {
200 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't enable data direction info %d:%s",
201 errno, strerror(errno));
202 goto close_fail;
203 }
204
205 opt = 1;
206 if (setsockopt(handle->fd, SOL_HCI, HCI_TIME_STAMP, &opt, sizeof(opt)) < 0) {
207 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't enable time stamp %d:%s",
208 errno, strerror(errno));
209 goto close_fail;
210 }
211
212 /* Setup filter, do not call hci function to avoid dependence on
213 * external libs */
214 memset(&flt, 0, sizeof(flt));
215 memset((void *) &flt.type_mask, 0xff, sizeof(flt.type_mask));
216 memset((void *) &flt.event_mask, 0xff, sizeof(flt.event_mask));
217 if (setsockopt(handle->fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
218 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't set filter %d:%s",
219 errno, strerror(errno));
220 goto close_fail;
221 }
222
223
224 /* Bind socket to the HCI device */
225 addr.hci_family = AF_BLUETOOTH;
226 addr.hci_dev = handle->md.ifindex;
227 if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
228 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't attach to device %d %d:%s",
229 handle->md.ifindex, errno, strerror(errno));
230 goto close_fail;
231 }
232
233 if (handle->opt.rfmon) {
234 /*
235 * Monitor mode doesn't apply to Bluetooth devices.
236 */
237 err = PCAP_ERROR_RFMON_NOTSUP;
238 goto close_fail;
239 }
240
241 if (handle->opt.buffer_size == 0) {
242 /*
243 * Set the socket buffer size to the specified value.
244 */
245 if (setsockopt(handle->fd, SOL_SOCKET, SO_RCVBUF,
246 &handle->opt.buffer_size,
247 sizeof(handle->opt.buffer_size)) == -1) {
248 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
249 "SO_RCVBUF: %s", pcap_strerror(errno));
250 goto close_fail;
251 }
252 }
253
254 handle->selectable_fd = handle->fd;
255 return 0;
256
257close_fail:
258 pcap_cleanup_live_common(handle);
259 return err;
260}
261
262static int
263bt_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
264{
265 struct cmsghdr *cmsg;
266 struct msghdr msg;
267 struct iovec iv;
268 struct pcap_pkthdr pkth;
269 pcap_bluetooth_h4_header* bthdr;
270
271 bthdr = (pcap_bluetooth_h4_header*) &handle->buffer[handle->offset];
272 iv.iov_base = &handle->buffer[handle->offset+sizeof(pcap_bluetooth_h4_header)];
273 iv.iov_len = handle->snapshot;
274
275 memset(&msg, 0, sizeof(msg));
276 msg.msg_iov = &iv;
277 msg.msg_iovlen = 1;
278 msg.msg_control = handle->buffer;
279 msg.msg_controllen = handle->offset;
280
281 /* ignore interrupt system call error */
282 do {
283 pkth.caplen = recvmsg(handle->fd, &msg, 0);
284 if (handle->break_loop)
285 {
286 handle->break_loop = 0;
287 return -2;
288 }
289 } while ((pkth.caplen == -1) && (errno == EINTR));
290
291
292 if (pkth.caplen < 0) {
293 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't receive packet %d:%s",
294 errno, strerror(errno));
295 return -1;
296 }
297
298 /* get direction and timestamp*/
299 cmsg = CMSG_FIRSTHDR(&msg);
300 int in=0;
301 while (cmsg) {
302 switch (cmsg->cmsg_type) {
303 case HCI_CMSG_DIR:
304 in = *((int *) CMSG_DATA(cmsg));
305 break;
306 case HCI_CMSG_TSTAMP:
307 pkth.ts = *((struct timeval *) CMSG_DATA(cmsg));
308 break;
309 }
310 cmsg = CMSG_NXTHDR(&msg, cmsg);
311 }
312 if ((in && (handle->direction == PCAP_D_OUT)) ||
313 ((!in) && (handle->direction == PCAP_D_IN)))
314 return 0;
315
316 bthdr->direction = htonl(in != 0);
317 pkth.caplen+=sizeof(pcap_bluetooth_h4_header);
318 pkth.len = pkth.caplen;
319 callback(user, &pkth, &handle->buffer[handle->offset]);
320 return 1;
321}
322
323static int
324bt_inject_linux(pcap_t *handle, const void *buf, size_t size)
325{
326 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on "
327 "bluetooth devices");
328 return (-1);
329}
330
331
332static int
333bt_stats_linux(pcap_t *handle, struct pcap_stat *stats)
334{
335 int ret;
336 struct hci_dev_info dev_info;
337 struct hci_dev_stats * s = &dev_info.stat;
338 dev_info.dev_id = handle->md.ifindex;
339
340 /* ingnore eintr */
341 do {
342 ret = ioctl(handle->fd, HCIGETDEVINFO, (void *)&dev_info);
343 } while ((ret == -1) && (errno == EINTR));
344
345 if (ret < 0) {
346 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "can get stats"
347 " via ioctl %d:%s", errno, strerror(errno));
348 return (-1);
349
350 }
351
352 /* we receive both rx and tx frames, so comulate all stats */
353 stats->ps_recv = s->evt_rx + s->acl_rx + s->sco_rx + s->cmd_tx +
354 s->acl_tx +s->sco_tx;
355 stats->ps_drop = s->err_rx + s->err_tx;
356 stats->ps_ifdrop = 0;
357 return 0;
358}
359
360static int
361bt_setfilter_linux(pcap_t *p, struct bpf_program *fp)
362{
363 return 0;
364}
365
366
367static int
368bt_setdirection_linux(pcap_t *p, pcap_direction_t d)
369{
370 p->direction = d;
371 return 0;
372}