2 * Copyright (c) 2014 Michal Labedzki for Tieto Corporation
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.
41 #include <bluetooth/bluetooth.h>
42 #include <bluetooth/hci.h>
44 #include "pcap/bluetooth.h"
47 #include "pcap-bt-monitor-linux.h"
49 #define BT_CONTROL_SIZE 32
50 #define INTERFACE_NAME "bluetooth-monitor"
54 * Currently contains nothing.
56 struct pcap_bt_monitor {
61 * Fields and alignment must match the declaration in the Linux kernel 3.4+.
62 * See struct hci_mon_hdr in include/net/bluetooth/hci_mon.h.
68 } __attribute__((packed));
71 bt_monitor_findalldevs(pcap_if_list_t *devlistp, char *err_str)
76 * Bluetooth is a wireless technology.
78 * This is a device to monitor all Bluetooth interfaces, so
79 * there's no notion of "connected" or "disconnected", any
80 * more than there's a notion of "connected" or "disconnected"
81 * for the "any" device.
83 if (add_dev(devlistp, INTERFACE_NAME,
84 PCAP_IF_WIRELESS|PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE,
85 "Bluetooth Linux Monitor", err_str) == NULL)
94 bt_monitor_read(pcap_t *handle, int max_packets _U_, pcap_handler callback, u_char *user)
100 struct pcap_pkthdr pkth;
101 pcap_bluetooth_linux_monitor_header *bthdr;
103 struct hci_mon_hdr hdr;
105 pktd = (u_char *)handle->buffer + BT_CONTROL_SIZE;
106 bthdr = (pcap_bluetooth_linux_monitor_header*)(void *)pktd;
108 iv[0].iov_base = &hdr;
109 iv[0].iov_len = sizeof(hdr);
110 iv[1].iov_base = pktd + sizeof(pcap_bluetooth_linux_monitor_header);
111 iv[1].iov_len = handle->snapshot;
113 memset(&pkth.ts, 0, sizeof(pkth.ts));
114 memset(&msg, 0, sizeof(msg));
117 msg.msg_control = handle->buffer;
118 msg.msg_controllen = BT_CONTROL_SIZE;
121 ret = recvmsg(handle->fd, &msg, 0);
122 if (handle->break_loop)
124 handle->break_loop = 0;
127 } while ((ret == -1) && (errno == EINTR));
130 if (errno == EAGAIN || errno == EWOULDBLOCK) {
131 /* Nonblocking mode, no data */
134 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
135 errno, "Can't receive packet");
139 pkth.caplen = (bpf_u_int32)(ret - sizeof(hdr) + sizeof(pcap_bluetooth_linux_monitor_header));
140 pkth.len = pkth.caplen;
142 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
143 if (cmsg->cmsg_level != SOL_SOCKET) continue;
145 if (cmsg->cmsg_type == SCM_TIMESTAMP) {
146 memcpy(&pkth.ts, CMSG_DATA(cmsg), sizeof(pkth.ts));
150 bthdr->adapter_id = htons(hdr.index);
151 bthdr->opcode = htons(hdr.opcode);
153 if (handle->fcode.bf_insns == NULL ||
154 pcap_filter(handle->fcode.bf_insns, pktd, pkth.len, pkth.caplen)) {
155 callback(user, &pkth, pktd);
158 return 0; /* didn't pass filter */
162 bt_monitor_inject(pcap_t *handle, const void *buf _U_, int size _U_)
164 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
165 "Packet injection is not supported yet on Bluetooth monitor devices");
170 bt_monitor_stats(pcap_t *handle _U_, struct pcap_stat *stats)
174 stats->ps_ifdrop = 0;
180 bt_monitor_activate(pcap_t* handle)
182 struct sockaddr_hci addr;
183 int err = PCAP_ERROR;
186 if (handle->opt.rfmon) {
187 /* monitor mode doesn't apply here */
188 return PCAP_ERROR_RFMON_NOTSUP;
192 * Turn a negative snapshot value (invalid), a snapshot value of
193 * 0 (unspecified), or a value bigger than the normal maximum
194 * value, into the maximum allowed value.
196 * If some application really *needs* a bigger snapshot
197 * length, we should just increase MAXIMUM_SNAPLEN.
199 if (handle->snapshot <= 0 || handle->snapshot > MAXIMUM_SNAPLEN)
200 handle->snapshot = MAXIMUM_SNAPLEN;
202 handle->bufsize = BT_CONTROL_SIZE + sizeof(pcap_bluetooth_linux_monitor_header) + handle->snapshot;
203 handle->linktype = DLT_BLUETOOTH_LINUX_MONITOR;
205 handle->read_op = bt_monitor_read;
206 handle->inject_op = bt_monitor_inject;
207 handle->setfilter_op = install_bpf_program; /* no kernel filtering */
208 handle->setdirection_op = NULL; /* Not implemented */
209 handle->set_datalink_op = NULL; /* can't change data link type */
210 handle->getnonblock_op = pcap_getnonblock_fd;
211 handle->setnonblock_op = pcap_setnonblock_fd;
212 handle->stats_op = bt_monitor_stats;
214 handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
215 if (handle->fd < 0) {
216 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
217 errno, "Can't create raw socket");
221 handle->buffer = malloc(handle->bufsize);
222 if (!handle->buffer) {
223 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
224 errno, "Can't allocate dump buffer");
228 /* Bind socket to the HCI device */
229 addr.hci_family = AF_BLUETOOTH;
230 addr.hci_dev = HCI_DEV_NONE;
231 addr.hci_channel = HCI_CHANNEL_MONITOR;
233 if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
234 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
235 errno, "Can't attach to interface");
240 if (setsockopt(handle->fd, SOL_SOCKET, SO_TIMESTAMP, &opt, sizeof(opt)) < 0) {
241 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
242 errno, "Can't enable time stamp");
246 handle->selectable_fd = handle->fd;
251 pcap_cleanup_live_common(handle);
256 bt_monitor_create(const char *device, char *ebuf, int *is_ours)
261 cp = strrchr(device, '/');
265 if (strcmp(cp, INTERFACE_NAME) != 0) {
271 p = PCAP_CREATE_COMMON(ebuf, struct pcap_bt_monitor);
275 p->activate_op = bt_monitor_activate;