external/bsd/libpcap/dist/pcap-bt-linux.c

   1 /*      $NetBSD: pcap-bt-linux.c,v 1.3 2015/03/31 21:39:42 christos Exp $       */
   2
   3 /*
   4  * Copyright (c) 2006 Paolo Abeni (Italy)
   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  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  * notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  * notice, this list of conditions and the following disclaimer in the
  15  * documentation and/or other materials provided with the distribution.
  16  * 3. The name of the author may not be used to endorse or promote
  17  * products derived from this software without specific prior written
  18  * permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * Bluetooth sniffing API implementation for Linux platform
  33  * By Paolo Abeni <paolo.abeni@email.it>
  34  *
  35  */
  36 #include <sys/cdefs.h>
  37 __RCSID("$NetBSD: pcap-bt-linux.c,v 1.3 2015/03/31 21:39:42 christos Exp $");
  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 */
  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 *);
  72
  73 /*
  74  * Private data for capturing on Linux Bluetooth devices.
  75  */
  76 struct pcap_bt {
  77         int dev_id;             /* device ID of device we're bound to */
  78 };
  79
  80 int
  81 bt_findalldevs(pcap_if_t **alldevsp, char *err_str)
  82 {
  83         struct hci_dev_list_req *dev_list;
  84         struct hci_dev_req *dev_req;
  85         int i, sock;
  86         int ret = 0;
  87
  88         sock  = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
  89         if (sock < 0)
  90         {
  91                 /* if bluetooth is not supported this this is not fatal*/
  92                 if (errno == EAFNOSUPPORT)
  93                         return 0;
  94                 snprintf(err_str, PCAP_ERRBUF_SIZE,
  95                     "Can't open raw Bluetooth socket: %s", strerror(errno));
  96                 return -1;
  97         }
  98
  99         dev_list = malloc(HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list));
 100         if (!dev_list)
 101         {
 102                 snprintf(err_str, PCAP_ERRBUF_SIZE, "Can't allocate %zu bytes for Bluetooth device list",
 103                         HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list));
 104                 ret = -1;
 105                 goto done;
 106         }
 107
 108         dev_list->dev_num = HCI_MAX_DEV;
 109
 110         if (ioctl(sock, HCIGETDEVLIST, (void *) dev_list) < 0)
 111         {
 112                 snprintf(err_str, PCAP_ERRBUF_SIZE,
 113                     "Can't get Bluetooth device list via ioctl: %s",
 114                     strerror(errno));
 115                 ret = -1;
 116                 goto free;
 117         }
 118
 119         dev_req = dev_list->dev_req;
 120         for (i = 0; i < dev_list->dev_num; i++, dev_req++) {
 121                 char dev_name[20], dev_descr[30];
 122
 123                 snprintf(dev_name, 20, BT_IFACE"%d", dev_req->dev_id);
 124                 snprintf(dev_descr, 30, "Bluetooth adapter number %d", i);
 125
 126                 if (pcap_add_if(alldevsp, dev_name, 0,
 127                        dev_descr, err_str) < 0)
 128                 {
 129                         ret = -1;
 130                         break;
 131                 }
 132
 133         }
 134
 135 free:
 136         free(dev_list);
 137
 138 done:
 139         close(sock);
 140         return ret;
 141 }
 142
 143 pcap_t *
 144 bt_create(const char *device, char *ebuf, int *is_ours)
 145 {
 146         const char *cp;
 147         char *cpend;
 148         long devnum;
 149         pcap_t *p;
 150
 151         /* Does this look like a Bluetooth device? */
 152         cp = strrchr(device, '/');
 153         if (cp == NULL)
 154                 cp = device;
 155         /* Does it begin with BT_IFACE? */
 156         if (strncmp(cp, BT_IFACE, sizeof BT_IFACE - 1) != 0) {
 157                 /* Nope, doesn't begin with BT_IFACE */
 158                 *is_ours = 0;
 159                 return NULL;
 160         }
 161         /* Yes - is BT_IFACE followed by a number? */
 162         cp += sizeof BT_IFACE - 1;
 163         devnum = strtol(cp, &cpend, 10);
 164         if (cpend == cp || *cpend != '\0') {
 165                 /* Not followed by a number. */
 166                 *is_ours = 0;
 167                 return NULL;
 168         }
 169         if (devnum < 0) {
 170                 /* Followed by a non-valid number. */
 171                 *is_ours = 0;
 172                 return NULL;
 173         }
 174
 175         /* OK, it's probably ours. */
 176         *is_ours = 1;
 177
 178         p = pcap_create_common(device, ebuf, sizeof (struct pcap_bt));
 179         if (p == NULL)
 180                 return (NULL);
 181
 182         p->activate_op = bt_activate;
 183         return (p);
 184 }
 185
 186 static int
 187 bt_activate(pcap_t* handle)
 188 {
 189         struct pcap_bt *handlep = handle->priv;
 190         struct sockaddr_hci addr;
 191         int opt;
 192         int             dev_id;
 193         struct hci_filter       flt;
 194         int err = PCAP_ERROR;
 195
 196         /* get bt interface id */
 197         if (sscanf(handle->opt.source, BT_IFACE"%d", &dev_id) != 1)
 198         {
 199                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 200                         "Can't get Bluetooth device index from %s",
 201                          handle->opt.source);
 202                 return PCAP_ERROR;
 203         }
 204
 205         /* Initialize some components of the pcap structure. */
 206         handle->bufsize = handle->snapshot+BT_CTRL_SIZE+sizeof(pcap_bluetooth_h4_header);
 207         handle->offset = BT_CTRL_SIZE;
 208         handle->linktype = DLT_BLUETOOTH_HCI_H4_WITH_PHDR;
 209
 210         handle->read_op = bt_read_linux;
 211         handle->inject_op = bt_inject_linux;
 212         handle->setfilter_op = install_bpf_program; /* no kernel filtering */
 213         handle->setdirection_op = bt_setdirection_linux;
 214         handle->set_datalink_op = NULL; /* can't change data link type */
 215         handle->getnonblock_op = pcap_getnonblock_fd;
 216         handle->setnonblock_op = pcap_setnonblock_fd;
 217         handle->stats_op = bt_stats_linux;
 218         handlep->dev_id = dev_id;
 219
 220         /* Create HCI socket */
 221         handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
 222         if (handle->fd < 0) {
 223                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 224                     "Can't create raw socket: %s", strerror(errno));
 225                 return PCAP_ERROR;
 226         }
 227
 228         handle->buffer = malloc(handle->bufsize);
 229         if (!handle->buffer) {
 230                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate dump buffer: %s",
 231                         pcap_strerror(errno));
 232                 goto close_fail;
 233         }
 234
 235         opt = 1;
 236         if (setsockopt(handle->fd, SOL_HCI, HCI_DATA_DIR, &opt, sizeof(opt)) < 0) {
 237                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 238                     "Can't enable data direction info: %s", strerror(errno));
 239                 goto close_fail;
 240         }
 241
 242         opt = 1;
 243         if (setsockopt(handle->fd, SOL_HCI, HCI_TIME_STAMP, &opt, sizeof(opt)) < 0) {
 244                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 245                     "Can't enable time stamp: %s", strerror(errno));
 246                 goto close_fail;
 247         }
 248
 249         /* Setup filter, do not call hci function to avoid dependence on
 250          * external libs        */
 251         memset(&flt, 0, sizeof(flt));
 252         memset((void *) &flt.type_mask, 0xff, sizeof(flt.type_mask));
 253         memset((void *) &flt.event_mask, 0xff, sizeof(flt.event_mask));
 254         if (setsockopt(handle->fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
 255                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 256                     "Can't set filter: %s", strerror(errno));
 257                 goto close_fail;
 258         }
 259
 260
 261         /* Bind socket to the HCI device */
 262         addr.hci_family = AF_BLUETOOTH;
 263         addr.hci_dev = handlep->dev_id;
 264 #ifdef SOCKADDR_HCI_HAS_HCI_CHANNEL
 265         addr.hci_channel = HCI_CHANNEL_RAW;
 266 #endif
 267         if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 268                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 269                     "Can't attach to device %d: %s", handlep->dev_id,
 270                     strerror(errno));
 271                 goto close_fail;
 272         }
 273
 274         if (handle->opt.rfmon) {
 275                 /*
 276                  * Monitor mode doesn't apply to Bluetooth devices.
 277                  */
 278                 err = PCAP_ERROR_RFMON_NOTSUP;
 279                 goto close_fail;
 280         }
 281
 282         if (handle->opt.buffer_size != 0) {
 283                 /*
 284                  * Set the socket buffer size to the specified value.
 285                  */
 286                 if (setsockopt(handle->fd, SOL_SOCKET, SO_RCVBUF,
 287                     &handle->opt.buffer_size,
 288                     sizeof(handle->opt.buffer_size)) == -1) {
 289                         snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 290                                  "SO_RCVBUF: %s", pcap_strerror(errno));
 291                         goto close_fail;
 292                 }
 293         }
 294
 295         handle->selectable_fd = handle->fd;
 296         return 0;
 297
 298 close_fail:
 299         pcap_cleanup_live_common(handle);
 300         return err;
 301 }
 302
 303 static int
 304 bt_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
 305 {
 306         struct cmsghdr *cmsg;
 307         struct msghdr msg;
 308         struct iovec  iv;
 309         ssize_t ret;
 310         struct pcap_pkthdr pkth;
 311         pcap_bluetooth_h4_header* bthdr;
 312
 313         bthdr = (pcap_bluetooth_h4_header*) &handle->buffer[handle->offset];
 314         iv.iov_base = &handle->buffer[handle->offset+sizeof(pcap_bluetooth_h4_header)];
 315         iv.iov_len  = handle->snapshot;
 316
 317         memset(&msg, 0, sizeof(msg));
 318         msg.msg_iov = &iv;
 319         msg.msg_iovlen = 1;
 320         msg.msg_control = handle->buffer;
 321         msg.msg_controllen = handle->offset;
 322
 323         /* ignore interrupt system call error */
 324         do {
 325                 ret = recvmsg(handle->fd, &msg, 0);
 326                 if (handle->break_loop)
 327                 {
 328                         handle->break_loop = 0;
 329                         return -2;
 330                 }
 331         } while ((ret == -1) && (errno == EINTR));
 332
 333         if (ret < 0) {
 334                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 335                     "Can't receive packet: %s", strerror(errno));
 336                 return -1;
 337         }
 338
 339         pkth.caplen = ret;
 340
 341         /* get direction and timestamp*/
 342         cmsg = CMSG_FIRSTHDR(&msg);
 343         int in=0;
 344         while (cmsg) {
 345                 switch (cmsg->cmsg_type) {
 346                         case HCI_CMSG_DIR:
 347                                 memcpy(&in, CMSG_DATA(cmsg), sizeof in);
 348                                 break;
 349                         case HCI_CMSG_TSTAMP:
 350                                 memcpy(&pkth.ts, CMSG_DATA(cmsg),
 351                                     sizeof pkth.ts);
 352                                 break;
 353                 }
 354                 cmsg = CMSG_NXTHDR(&msg, cmsg);
 355         }
 356         if ((in && (handle->direction == PCAP_D_OUT)) ||
 357                                 ((!in) && (handle->direction == PCAP_D_IN)))
 358                 return 0;
 359
 360         bthdr->direction = htonl(in != 0);
 361         pkth.caplen+=sizeof(pcap_bluetooth_h4_header);
 362         pkth.len = pkth.caplen;
 363         if (handle->fcode.bf_insns == NULL ||
 364             bpf_filter(handle->fcode.bf_insns, &handle->buffer[handle->offset],
 365               pkth.len, pkth.caplen)) {
 366                 callback(user, &pkth, &handle->buffer[handle->offset]);
 367                 return 1;
 368         }
 369         return 0;       /* didn't pass filter */
 370 }
 371
 372 static int
 373 bt_inject_linux(pcap_t *handle, const void *buf, size_t size)
 374 {
 375         snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on "
 376                 "bluetooth devices");
 377         return (-1);
 378 }
 379
 380
 381 static int
 382 bt_stats_linux(pcap_t *handle, struct pcap_stat *stats)
 383 {
 384         struct pcap_bt *handlep = handle->priv;
 385         int ret;
 386         struct hci_dev_info dev_info;
 387         struct hci_dev_stats * s = &dev_info.stat;
 388         dev_info.dev_id = handlep->dev_id;
 389
 390         /* ignore eintr */
 391         do {
 392                 ret = ioctl(handle->fd, HCIGETDEVINFO, (void *)&dev_info);
 393         } while ((ret == -1) && (errno == EINTR));
 394
 395         if (ret < 0) {
 396                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 397                     "Can't get stats via ioctl: %s", strerror(errno));
 398                 return (-1);
 399
 400         }
 401
 402         /* we receive both rx and tx frames, so comulate all stats */
 403         stats->ps_recv = s->evt_rx + s->acl_rx + s->sco_rx + s->cmd_tx +
 404                 s->acl_tx +s->sco_tx;
 405         stats->ps_drop = s->err_rx + s->err_tx;
 406         stats->ps_ifdrop = 0;
 407         return 0;
 408 }
 409
 410 static int
 411 bt_setdirection_linux(pcap_t *p, pcap_direction_t d)
 412 {
 413         p->direction = d;
 414         return 0;
 415 }