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>
40 #include "pcap-bt-linux.h"
41 #include "pcap/bluetooth.h"
48 #include <sys/ioctl.h>
49 #include <sys/socket.h>
50 #include <arpa/inet.h>
52 #include <bluetooth/bluetooth.h>
53 #include <bluetooth/hci.h>
55 #define BT_IFACE "bluetooth"
56 #define BT_CTRL_SIZE 128
58 /* forward declaration */
59 static int bt_activate(pcap_t *);
60 static int bt_read_linux(pcap_t *, int , pcap_handler , u_char *);
61 static int bt_inject_linux(pcap_t *, const void *, size_t);
62 static int bt_setdirection_linux(pcap_t *, pcap_direction_t);
63 static int bt_stats_linux(pcap_t *, struct pcap_stat *);
66 * Private data for capturing on Linux Bluetooth devices.
69 int dev_id; /* device ID of device we're bound to */
73 bt_findalldevs(pcap_if_list_t *devlistp, char *err_str)
75 struct hci_dev_list_req *dev_list;
76 struct hci_dev_req *dev_req;
80 sock = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
83 /* if bluetooth is not supported this this is not fatal*/
84 if (errno == EAFNOSUPPORT)
86 pcap_fmt_errmsg_for_errno(err_str, PCAP_ERRBUF_SIZE,
87 errno, "Can't open raw Bluetooth socket");
91 dev_list = malloc(HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list));
94 pcap_snprintf(err_str, PCAP_ERRBUF_SIZE, "Can't allocate %zu bytes for Bluetooth device list",
95 HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list));
100 dev_list->dev_num = HCI_MAX_DEV;
102 if (ioctl(sock, HCIGETDEVLIST, (void *) dev_list) < 0)
104 pcap_fmt_errmsg_for_errno(err_str, PCAP_ERRBUF_SIZE,
105 errno, "Can't get Bluetooth device list via ioctl");
110 dev_req = dev_list->dev_req;
111 for (i = 0; i < dev_list->dev_num; i++, dev_req++) {
112 char dev_name[20], dev_descr[30];
114 pcap_snprintf(dev_name, 20, BT_IFACE"%d", dev_req->dev_id);
115 pcap_snprintf(dev_descr, 30, "Bluetooth adapter number %d", i);
118 * Bluetooth is a wireless technology.
119 * XXX - if there's the notion of associating with a
120 * network, and we can determine whether the interface
121 * is associated with a network, check that and set
122 * the status to PCAP_IF_CONNECTION_STATUS_CONNECTED
123 * or PCAP_IF_CONNECTION_STATUS_DISCONNECTED.
125 if (add_dev(devlistp, dev_name, PCAP_IF_WIRELESS, dev_descr, err_str) == NULL)
141 bt_create(const char *device, char *ebuf, int *is_ours)
148 /* Does this look like a Bluetooth device? */
149 cp = strrchr(device, '/');
152 /* Does it begin with BT_IFACE? */
153 if (strncmp(cp, BT_IFACE, sizeof BT_IFACE - 1) != 0) {
154 /* Nope, doesn't begin with BT_IFACE */
158 /* Yes - is BT_IFACE followed by a number? */
159 cp += sizeof BT_IFACE - 1;
160 devnum = strtol(cp, &cpend, 10);
161 if (cpend == cp || *cpend != '\0') {
162 /* Not followed by a number. */
167 /* Followed by a non-valid number. */
172 /* OK, it's probably ours. */
175 p = pcap_create_common(ebuf, sizeof (struct pcap_bt));
179 p->activate_op = bt_activate;
184 bt_activate(pcap_t* handle)
186 struct pcap_bt *handlep = handle->priv;
187 struct sockaddr_hci addr;
190 struct hci_filter flt;
191 int err = PCAP_ERROR;
193 /* get bt interface id */
194 if (sscanf(handle->opt.device, BT_IFACE"%d", &dev_id) != 1)
196 pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
197 "Can't get Bluetooth device index from %s",
203 * Turn a negative snapshot value (invalid), a snapshot value of
204 * 0 (unspecified), or a value bigger than the normal maximum
205 * value, into the maximum allowed value.
207 * If some application really *needs* a bigger snapshot
208 * length, we should just increase MAXIMUM_SNAPLEN.
210 if (handle->snapshot <= 0 || handle->snapshot > MAXIMUM_SNAPLEN)
211 handle->snapshot = MAXIMUM_SNAPLEN;
213 /* Initialize some components of the pcap structure. */
214 handle->bufsize = BT_CTRL_SIZE+sizeof(pcap_bluetooth_h4_header)+handle->snapshot;
215 handle->linktype = DLT_BLUETOOTH_HCI_H4_WITH_PHDR;
217 handle->read_op = bt_read_linux;
218 handle->inject_op = bt_inject_linux;
219 handle->setfilter_op = install_bpf_program; /* no kernel filtering */
220 handle->setdirection_op = bt_setdirection_linux;
221 handle->set_datalink_op = NULL; /* can't change data link type */
222 handle->getnonblock_op = pcap_getnonblock_fd;
223 handle->setnonblock_op = pcap_setnonblock_fd;
224 handle->stats_op = bt_stats_linux;
225 handlep->dev_id = dev_id;
227 /* Create HCI socket */
228 handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
229 if (handle->fd < 0) {
230 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
231 errno, "Can't create raw socket");
235 handle->buffer = malloc(handle->bufsize);
236 if (!handle->buffer) {
237 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
238 errno, "Can't allocate dump buffer");
243 if (setsockopt(handle->fd, SOL_HCI, HCI_DATA_DIR, &opt, sizeof(opt)) < 0) {
244 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
245 errno, "Can't enable data direction info");
250 if (setsockopt(handle->fd, SOL_HCI, HCI_TIME_STAMP, &opt, sizeof(opt)) < 0) {
251 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
252 errno, "Can't enable time stamp");
256 /* Setup filter, do not call hci function to avoid dependence on
258 memset(&flt, 0, sizeof(flt));
259 memset((void *) &flt.type_mask, 0xff, sizeof(flt.type_mask));
260 memset((void *) &flt.event_mask, 0xff, sizeof(flt.event_mask));
261 if (setsockopt(handle->fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
262 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
263 errno, "Can't set filter");
268 /* Bind socket to the HCI device */
269 addr.hci_family = AF_BLUETOOTH;
270 addr.hci_dev = handlep->dev_id;
271 #ifdef HAVE_STRUCT_SOCKADDR_HCI_HCI_CHANNEL
272 addr.hci_channel = HCI_CHANNEL_RAW;
274 if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
275 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
276 errno, "Can't attach to device %d", handlep->dev_id);
280 if (handle->opt.rfmon) {
282 * Monitor mode doesn't apply to Bluetooth devices.
284 err = PCAP_ERROR_RFMON_NOTSUP;
288 if (handle->opt.buffer_size != 0) {
290 * Set the socket buffer size to the specified value.
292 if (setsockopt(handle->fd, SOL_SOCKET, SO_RCVBUF,
293 &handle->opt.buffer_size,
294 sizeof(handle->opt.buffer_size)) == -1) {
295 pcap_fmt_errmsg_for_errno(handle->errbuf,
296 errno, PCAP_ERRBUF_SIZE, "SO_RCVBUF");
301 handle->selectable_fd = handle->fd;
305 pcap_cleanup_live_common(handle);
310 bt_read_linux(pcap_t *handle, int max_packets _U_, pcap_handler callback, u_char *user)
312 struct cmsghdr *cmsg;
316 struct pcap_pkthdr pkth;
317 pcap_bluetooth_h4_header* bthdr;
321 pktd = (u_char *)handle->buffer + BT_CTRL_SIZE;
322 bthdr = (pcap_bluetooth_h4_header*)(void *)pktd;
323 iv.iov_base = pktd + sizeof(pcap_bluetooth_h4_header);
324 iv.iov_len = handle->snapshot;
326 memset(&msg, 0, sizeof(msg));
329 msg.msg_control = handle->buffer;
330 msg.msg_controllen = BT_CTRL_SIZE;
332 /* ignore interrupt system call error */
334 ret = recvmsg(handle->fd, &msg, 0);
335 if (handle->break_loop)
337 handle->break_loop = 0;
340 } while ((ret == -1) && (errno == EINTR));
343 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
344 errno, "Can't receive packet");
350 /* get direction and timestamp*/
351 cmsg = CMSG_FIRSTHDR(&msg);
353 switch (cmsg->cmsg_type) {
355 memcpy(&in, CMSG_DATA(cmsg), sizeof in);
357 case HCI_CMSG_TSTAMP:
358 memcpy(&pkth.ts, CMSG_DATA(cmsg),
362 cmsg = CMSG_NXTHDR(&msg, cmsg);
364 if ((in && (handle->direction == PCAP_D_OUT)) ||
365 ((!in) && (handle->direction == PCAP_D_IN)))
368 bthdr->direction = htonl(in != 0);
369 pkth.caplen+=sizeof(pcap_bluetooth_h4_header);
370 pkth.len = pkth.caplen;
371 if (handle->fcode.bf_insns == NULL ||
372 bpf_filter(handle->fcode.bf_insns, pktd, pkth.len, pkth.caplen)) {
373 callback(user, &pkth, pktd);
376 return 0; /* didn't pass filter */
380 bt_inject_linux(pcap_t *handle, const void *buf _U_, size_t size _U_)
382 pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on "
383 "bluetooth devices");
389 bt_stats_linux(pcap_t *handle, struct pcap_stat *stats)
391 struct pcap_bt *handlep = handle->priv;
393 struct hci_dev_info dev_info;
394 struct hci_dev_stats * s = &dev_info.stat;
395 dev_info.dev_id = handlep->dev_id;
399 ret = ioctl(handle->fd, HCIGETDEVINFO, (void *)&dev_info);
400 } while ((ret == -1) && (errno == EINTR));
403 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
404 errno, "Can't get stats via ioctl");
409 /* we receive both rx and tx frames, so comulate all stats */
410 stats->ps_recv = s->evt_rx + s->acl_rx + s->sco_rx + s->cmd_tx +
411 s->acl_tx +s->sco_tx;
412 stats->ps_drop = s->err_rx + s->err_tx;
413 stats->ps_ifdrop = 0;
418 bt_setdirection_linux(pcap_t *p, pcap_direction_t d)