The Tcpdump Group git mirrors - libpcap/blob - pcap-bt-linux.c

   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. Neither the name of the Politecnico di Torino, CACE Technologies
  15  * nor the names of its contributors may be used to endorse or promote
  16  * products derived from this software without specific prior written
  17  * permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  * USB sniffig API implementation for linux platform
  32  * By Paolo Abeni <paolo.abeni@email.com>
  33  *
  34  */
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include "config.h"
  38 #endif
  39
  40 #include "pcap-int.h"
  41
  42 #ifdef NEED_STRERROR_H
  43 #include "strerror.h"
  44 #endif
  45
  46 #include <errno.h>
  47 #include <stdlib.h>
  48 #include <unistd.h>
  49 #include <fcntl.h>
  50 #include <string.h>
  51 #include <sys/ioctl.h>
  52 #include <sys/socket.h>
  53
  54 #include <bluetooth/bluetooth.h>
  55 #include <bluetooth/hci.h>
  56
  57 #define BT_IFACE "bluetooth"
  58 #define BT_CTRL_SIZE 128
  59
  60 /* forward declaration */
  61 static int bt_read_linux(pcap_t *, int , pcap_handler , u_char *);
  62 static int bt_inject_linux(pcap_t *, const void *, size_t);
  63 static int bt_setfilter_linux(pcap_t *, struct bpf_program *);
  64 static int bt_setdirection_linux(pcap_t *, pcap_direction_t);
  65 static int bt_stats_linux(pcap_t *, struct pcap_stat *);
  66 static void bt_close_linux(pcap_t *);
  67
  68 int
  69 bt_platform_finddevs(pcap_if_t **alldevsp, char *err_str)
  70 {
  71         pcap_if_t *found_dev = *alldevsp;
  72         struct hci_dev_list_req *dev_list;
  73         struct hci_dev_req *dev_req;
  74         int i, sock;
  75         int ret = 0;
  76
  77         sock  = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
  78         if (sock < 0)
  79         {
  80                 snprintf(err_str, PCAP_ERRBUF_SIZE, "can't open raw by socket %d:%s",
  81                         errno, strerror(errno));
  82                 return -1;
  83         }
  84
  85         dev_list = malloc(HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list));
  86         if (!dev_list)
  87         {
  88                 snprintf(err_str, PCAP_ERRBUF_SIZE, "can't allocate %d bytes for dev cache",
  89                         HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list));
  90                 ret = -1;
  91                 goto done;
  92         }
  93
  94         dev_list->dev_num = HCI_MAX_DEV;
  95
  96         if (ioctl(sock, HCIGETDEVLIST, (void *) dev_list) < 0)
  97         {
  98                 snprintf(err_str, PCAP_ERRBUF_SIZE, "can't get dev list via ioctl %d:%s",
  99                         errno, strerror(errno));
 100                 ret = -1;
 101                 goto free;
 102         }
 103
 104         dev_req = dev_list->dev_req;
 105         for (i = 0; i < dev_list->dev_num; i++, dev_req++) {
 106                 char dev_name[20], dev_descr[30];
 107
 108                 snprintf(dev_name, 20, BT_IFACE"%d", dev_req->dev_id);
 109                 snprintf(dev_descr, 30, "bluetooth adapter number %d", i);
 110
 111                 if (pcap_add_if(&found_dev, dev_name, 0,
 112                        dev_descr, err_str) < 0)
 113                 {
 114                         ret = -1;
 115                         break;
 116                 }
 117
 118         }
 119
 120 free:
 121         free(dev_list);
 122
 123 done:
 124         close(sock);
 125         return ret;
 126 }
 127
 128 pcap_t*
 129 bt_open_live(const char* bus, int snaplen, int promisc , int to_ms, char* errmsg)
 130 {
 131         struct sockaddr_hci addr;
 132         int opt;
 133         pcap_t          *handle;
 134         int             dev_id;
 135         struct hci_filter       flt;
 136
 137         /* get bt interface id */
 138         if (sscanf(bus, BT_IFACE"%d", &dev_id) != 1)
 139         {
 140                 snprintf(errmsg, PCAP_ERRBUF_SIZE,
 141                         "Can't get usb bus index from %s", bus);
 142                 return NULL;
 143         }
 144
 145         /* Allocate a handle for this session. */
 146         handle = malloc(sizeof(*handle));
 147         if (handle == NULL) {
 148                 snprintf(errmsg, PCAP_ERRBUF_SIZE, "malloc: %s",
 149                         pcap_strerror(errno));
 150                 return NULL;
 151         }
 152
 153         /* Initialize some components of the pcap structure. */
 154         memset(handle, 0, sizeof(*handle));
 155         handle->snapshot        = snaplen;
 156         handle->md.timeout      = to_ms;
 157         handle->bufsize = snaplen+BT_CTRL_SIZE;
 158         handle->offset = BT_CTRL_SIZE;
 159         handle->linktype = DLT_BLUETOOTH_HCI_H4;
 160
 161         handle->read_op = bt_read_linux;
 162         handle->inject_op = bt_inject_linux;
 163         handle->setfilter_op = bt_setfilter_linux;
 164         handle->setdirection_op = bt_setdirection_linux;
 165         handle->set_datalink_op = NULL; /* can't change data link type */
 166         handle->getnonblock_op = pcap_getnonblock_fd;
 167         handle->setnonblock_op = pcap_setnonblock_fd;
 168         handle->stats_op = bt_stats_linux;
 169         handle->close_op = bt_close_linux;
 170         handle->md.ifindex = dev_id;
 171
 172         /* Create HCI socket */
 173         handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
 174         if (handle->fd < 0) {
 175                 snprintf(errmsg, PCAP_ERRBUF_SIZE, "Can't create raw socket %d:%s",
 176                         errno, strerror(errno));
 177                 free(handle);
 178                 return NULL;
 179         }
 180
 181         handle->buffer = malloc(snaplen+BT_CTRL_SIZE);
 182         if (!handle->buffer) {
 183                 snprintf(errmsg, PCAP_ERRBUF_SIZE, "Can't allocate dump buffer: %s",
 184                         pcap_strerror(errno));
 185                 pcap_close(handle);
 186                 return NULL;
 187         }
 188
 189         opt = 1;
 190         if (setsockopt(handle->fd, SOL_HCI, HCI_DATA_DIR, &opt, sizeof(opt)) < 0) {
 191                 snprintf(errmsg, PCAP_ERRBUF_SIZE, "Can't enable data direction info %d:%s",
 192                         errno, strerror(errno));
 193                 pcap_close(handle);
 194                 return NULL;
 195         }
 196
 197         opt = 1;
 198         if (setsockopt(handle->fd, SOL_HCI, HCI_TIME_STAMP, &opt, sizeof(opt)) < 0) {
 199                 snprintf(errmsg, PCAP_ERRBUF_SIZE, "Can't enable time stamp %d:%s",
 200                         errno, strerror(errno));
 201                 pcap_close(handle);
 202                 return NULL;
 203         }
 204
 205         /* Setup filter, do not call hci function to avoid dependence on
 206          * external libs        */
 207         memset(&flt, 0, sizeof(flt));
 208         memset((void *) &flt.type_mask, 0xff, sizeof(flt.type_mask));
 209         memset((void *) &flt.event_mask, 0xff, sizeof(flt.event_mask));
 210         if (setsockopt(handle->fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
 211                 snprintf(errmsg, PCAP_ERRBUF_SIZE, "Can't set filter %d:%s",
 212                         errno, strerror(errno));
 213                 pcap_close(handle);
 214                 return NULL;
 215         }
 216
 217
 218         /* Bind socket to the HCI device */
 219         addr.hci_family = AF_BLUETOOTH;
 220         addr.hci_dev = handle->md.ifindex;
 221         if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 222                 snprintf(errmsg, PCAP_ERRBUF_SIZE, "Can't attach to device %d %d:%s",
 223                         handle->md.ifindex, errno, strerror(errno));
 224                 pcap_close(handle);
 225                 return NULL;
 226         }
 227         handle->selectable_fd = handle->fd;
 228
 229         return handle;
 230 }
 231
 232 static int
 233 bt_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
 234 {
 235         struct cmsghdr *cmsg;
 236         struct msghdr msg;
 237         struct iovec  iv;
 238         struct pcap_pkthdr pkth;
 239
 240         iv.iov_base = &handle->buffer[handle->offset];
 241         iv.iov_len  = handle->snapshot;
 242
 243         memset(&msg, 0, sizeof(msg));
 244         msg.msg_iov = &iv;
 245         msg.msg_iovlen = 1;
 246         msg.msg_control = handle->buffer;
 247         msg.msg_controllen = handle->offset;
 248
 249         /* ignore interrupt system call error */
 250         do {
 251                 pkth.caplen = recvmsg(handle->fd, &msg, 0);
 252                 if (handle->break_loop)
 253                 {
 254                         handle->break_loop = 0;
 255                         return -2;
 256                 }
 257         } while ((pkth.caplen == -1) && (errno == EINTR));
 258
 259
 260         if (pkth.caplen < 0) {
 261                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't receive packet %d:%s",
 262                         handle->md.ifindex, errno, strerror(errno));
 263                 return -1;
 264         }
 265
 266         /* get direction and timestamp*/
 267         cmsg = CMSG_FIRSTHDR(&msg);
 268         while (cmsg) {
 269                 int in;
 270                 switch (cmsg->cmsg_type) {
 271                         case HCI_CMSG_DIR:
 272                                 in = *((int *) CMSG_DATA(cmsg));
 273                                 break;
 274                         case HCI_CMSG_TSTAMP:
 275                                 pkth.ts = *((struct timeval *) CMSG_DATA(cmsg));
 276                                 break;
 277                 }
 278                 cmsg = CMSG_NXTHDR(&msg, cmsg);
 279         }
 280         pkth.len = pkth.caplen;
 281         callback(user, &pkth, iv.iov_base);
 282         return 1;
 283 }
 284
 285 static int
 286 bt_inject_linux(pcap_t *handle, const void *buf, size_t size)
 287 {
 288         snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on "
 289                 "bluetooth devices");
 290         return (-1);
 291 }
 292
 293
 294 static void
 295 bt_close_linux(pcap_t* handle)
 296 {
 297         close(handle->fd);
 298         free(handle->buffer);
 299 }
 300
 301
 302 static int
 303 bt_stats_linux(pcap_t *handle, struct pcap_stat *stats)
 304 {
 305         int ret;
 306         struct hci_dev_info dev_info;
 307         struct hci_dev_stats * s = &dev_info.stat;
 308         dev_info.dev_id = handle->md.ifindex;
 309
 310         /* ingnore eintr */
 311         do {
 312                 ret = ioctl(handle->fd, HCIGETDEVINFO, (void *)&dev_info);
 313         } while ((ret == -1) && (errno == EINTR));
 314
 315         if (ret < 0) {
 316                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "can get stats"
 317                         " via ioctl %d:%s", errno, strerror(errno));
 318                 return (-1);
 319
 320         }
 321
 322         /* we receive both rx and tx frames, so comulate all stats */
 323         stats->ps_recv = s->evt_rx + s->acl_rx + s->sco_rx + s->cmd_tx +
 324                 s->acl_tx +s->sco_tx;
 325         stats->ps_drop = s->err_rx + s->err_tx;
 326         stats->ps_ifdrop = 0;
 327         return 0;
 328 }
 329
 330 static int
 331 bt_setfilter_linux(pcap_t *p, struct bpf_program *fp)
 332 {
 333         return 0;
 334 }
 335
 336
 337 static int
 338 bt_setdirection_linux(pcap_t *p, pcap_direction_t d)
 339 {
 340         p->direction = d;
 341         return 0;
 342 }