2 * Copyright (c) 2006 Paolo Abeni (Italy)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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
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.
30 * Bluetooth sniffing API implementation for Linux platform
31 * By Paolo Abeni <paolo.abeni@email.it>
35 static 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)";
44 #include "pcap-bt-linux.h"
45 #include "pcap/bluetooth.h"
47 #ifdef NEED_STRERROR_H
56 #include <sys/ioctl.h>
57 #include <sys/socket.h>
58 #include <arpa/inet.h>
60 #include <bluetooth/bluetooth.h>
61 #include <bluetooth/hci.h>
63 #define BT_IFACE "bluetooth"
64 #define BT_CTRL_SIZE 128
66 /* forward declaration */
67 static int bt_activate(pcap_t *);
68 static int bt_read_linux(pcap_t *, int , pcap_handler , u_char *);
69 static int bt_inject_linux(pcap_t *, const void *, size_t);
70 static int bt_setdirection_linux(pcap_t *, pcap_direction_t);
71 static int bt_stats_linux(pcap_t *, struct pcap_stat *);
74 bt_findalldevs(pcap_if_t **alldevsp, char *err_str)
76 pcap_if_t *found_dev = *alldevsp;
77 struct hci_dev_list_req *dev_list;
78 struct hci_dev_req *dev_req;
82 sock = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
85 /* if bluetooth is not supported this this is not fatal*/
86 if (errno == EAFNOSUPPORT)
88 snprintf(err_str, PCAP_ERRBUF_SIZE,
89 "Can't open raw Bluetooth socket: %s", strerror(errno));
93 dev_list = malloc(HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list));
96 snprintf(err_str, PCAP_ERRBUF_SIZE, "Can't allocate %zu bytes for Bluetooth device list",
97 HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list));
102 dev_list->dev_num = HCI_MAX_DEV;
104 if (ioctl(sock, HCIGETDEVLIST, (void *) dev_list) < 0)
106 snprintf(err_str, PCAP_ERRBUF_SIZE,
107 "Can't get Bluetooth device list via ioctl: %s",
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];
117 snprintf(dev_name, 20, BT_IFACE"%d", dev_req->dev_id);
118 snprintf(dev_descr, 30, "Bluetooth adapter number %d", i);
120 if (pcap_add_if(&found_dev, dev_name, 0,
121 dev_descr, err_str) < 0)
138 bt_create(const char *device, char *ebuf, int *is_ours)
145 /* Does this look like a Bluetooth device? */
146 cp = strrchr(device, '/');
149 /* Does it begin with BT_IFACE? */
150 if (strncmp(cp, BT_IFACE, sizeof BT_IFACE - 1) != 0) {
151 /* Nope, doesn't begin with BT_IFACE */
155 /* Yes - is BT_IFACE followed by a number? */
156 cp += sizeof BT_IFACE - 1;
157 devnum = strtol(cp, &cpend, 10);
158 if (cpend == cp || *cpend != '\0') {
159 /* Not followed by a number. */
164 /* Followed by a non-valid number. */
169 /* OK, it's probably ours. */
172 p = pcap_create_common(device, ebuf);
176 p->activate_op = bt_activate;
181 bt_activate(pcap_t* handle)
183 struct sockaddr_hci addr;
186 struct hci_filter flt;
187 int err = PCAP_ERROR;
189 /* get bt interface id */
190 if (sscanf(handle->opt.source, BT_IFACE"%d", &dev_id) != 1)
192 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
193 "Can't get Bluetooth device index from %s",
198 /* Initialize some components of the pcap structure. */
199 handle->bufsize = handle->snapshot+BT_CTRL_SIZE+sizeof(pcap_bluetooth_h4_header);
200 handle->offset = BT_CTRL_SIZE;
201 handle->linktype = DLT_BLUETOOTH_HCI_H4_WITH_PHDR;
203 handle->read_op = bt_read_linux;
204 handle->inject_op = bt_inject_linux;
205 handle->setfilter_op = install_bpf_program; /* no kernel filtering */
206 handle->setdirection_op = bt_setdirection_linux;
207 handle->set_datalink_op = NULL; /* can't change data link type */
208 handle->getnonblock_op = pcap_getnonblock_fd;
209 handle->setnonblock_op = pcap_setnonblock_fd;
210 handle->stats_op = bt_stats_linux;
211 handle->md.ifindex = dev_id;
213 /* Create HCI socket */
214 handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
215 if (handle->fd < 0) {
216 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
217 "Can't create raw socket: %s", strerror(errno));
221 handle->buffer = malloc(handle->bufsize);
222 if (!handle->buffer) {
223 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate dump buffer: %s",
224 pcap_strerror(errno));
229 if (setsockopt(handle->fd, SOL_HCI, HCI_DATA_DIR, &opt, sizeof(opt)) < 0) {
230 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
231 "Can't enable data direction info: %s", strerror(errno));
236 if (setsockopt(handle->fd, SOL_HCI, HCI_TIME_STAMP, &opt, sizeof(opt)) < 0) {
237 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
238 "Can't enable time stamp: %s", strerror(errno));
242 /* Setup filter, do not call hci function to avoid dependence on
244 memset(&flt, 0, sizeof(flt));
245 memset((void *) &flt.type_mask, 0xff, sizeof(flt.type_mask));
246 memset((void *) &flt.event_mask, 0xff, sizeof(flt.event_mask));
247 if (setsockopt(handle->fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
248 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
249 "Can't set filter: %s", strerror(errno));
254 /* Bind socket to the HCI device */
255 addr.hci_family = AF_BLUETOOTH;
256 addr.hci_dev = handle->md.ifindex;
257 #ifdef SOCKADDR_HCI_HAS_HCI_CHANNEL
258 addr.hci_channel = HCI_CHANNEL_RAW;
260 if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
261 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
262 "Can't attach to device %d: %s", handle->md.ifindex,
267 if (handle->opt.rfmon) {
269 * Monitor mode doesn't apply to Bluetooth devices.
271 err = PCAP_ERROR_RFMON_NOTSUP;
275 if (handle->opt.buffer_size != 0) {
277 * Set the socket buffer size to the specified value.
279 if (setsockopt(handle->fd, SOL_SOCKET, SO_RCVBUF,
280 &handle->opt.buffer_size,
281 sizeof(handle->opt.buffer_size)) == -1) {
282 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
283 "SO_RCVBUF: %s", pcap_strerror(errno));
288 handle->selectable_fd = handle->fd;
292 pcap_cleanup_live_common(handle);
297 bt_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
299 struct cmsghdr *cmsg;
303 struct pcap_pkthdr pkth;
304 pcap_bluetooth_h4_header* bthdr;
306 bthdr = (pcap_bluetooth_h4_header*) &handle->buffer[handle->offset];
307 iv.iov_base = &handle->buffer[handle->offset+sizeof(pcap_bluetooth_h4_header)];
308 iv.iov_len = handle->snapshot;
310 memset(&msg, 0, sizeof(msg));
313 msg.msg_control = handle->buffer;
314 msg.msg_controllen = handle->offset;
316 /* ignore interrupt system call error */
318 ret = recvmsg(handle->fd, &msg, 0);
319 if (handle->break_loop)
321 handle->break_loop = 0;
324 } while ((ret == -1) && (errno == EINTR));
327 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
328 "Can't receive packet: %s", strerror(errno));
334 /* get direction and timestamp*/
335 cmsg = CMSG_FIRSTHDR(&msg);
338 switch (cmsg->cmsg_type) {
340 memcpy(&in, CMSG_DATA(cmsg), sizeof in);
342 case HCI_CMSG_TSTAMP:
343 memcpy(&pkth.ts, CMSG_DATA(cmsg),
347 cmsg = CMSG_NXTHDR(&msg, cmsg);
349 if ((in && (handle->direction == PCAP_D_OUT)) ||
350 ((!in) && (handle->direction == PCAP_D_IN)))
353 bthdr->direction = htonl(in != 0);
354 pkth.caplen+=sizeof(pcap_bluetooth_h4_header);
355 pkth.len = pkth.caplen;
356 if (handle->fcode.bf_insns == NULL ||
357 bpf_filter(handle->fcode.bf_insns, &handle->buffer[handle->offset],
358 pkth.len, pkth.caplen)) {
359 callback(user, &pkth, &handle->buffer[handle->offset]);
362 return 0; /* didn't pass filter */
366 bt_inject_linux(pcap_t *handle, const void *buf, size_t size)
368 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on "
369 "bluetooth devices");
375 bt_stats_linux(pcap_t *handle, struct pcap_stat *stats)
378 struct hci_dev_info dev_info;
379 struct hci_dev_stats * s = &dev_info.stat;
380 dev_info.dev_id = handle->md.ifindex;
384 ret = ioctl(handle->fd, HCIGETDEVINFO, (void *)&dev_info);
385 } while ((ret == -1) && (errno == EINTR));
388 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
389 "Can't get stats via ioctl: %s", strerror(errno));
394 /* we receive both rx and tx frames, so comulate all stats */
395 stats->ps_recv = s->evt_rx + s->acl_rx + s->sco_rx + s->cmd_tx +
396 s->acl_tx +s->sco_tx;
397 stats->ps_drop = s->err_rx + s->err_tx;
398 stats->ps_ifdrop = 0;
403 bt_setdirection_linux(pcap_t *p, pcap_direction_t d)