1335640Shselasky/* 2335640Shselasky * Copyright (c) 2006 Paolo Abeni (Italy) 3335640Shselasky * All rights reserved. 4335640Shselasky * 5335640Shselasky * Redistribution and use in source and binary forms, with or without 6335640Shselasky * modification, are permitted provided that the following conditions 7335640Shselasky * are met: 8335640Shselasky * 9335640Shselasky * 1. Redistributions of source code must retain the above copyright 10335640Shselasky * notice, this list of conditions and the following disclaimer. 11335640Shselasky * 2. Redistributions in binary form must reproduce the above copyright 12335640Shselasky * notice, this list of conditions and the following disclaimer in the 13335640Shselasky * documentation and/or other materials provided with the distribution. 14335640Shselasky * 3. The name of the author may not be used to endorse or promote 15335640Shselasky * products derived from this software without specific prior written 16335640Shselasky * permission. 17335640Shselasky * 18335640Shselasky * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19335640Shselasky * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20335640Shselasky * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21335640Shselasky * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22335640Shselasky * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23335640Shselasky * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24335640Shselasky * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25335640Shselasky * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26335640Shselasky * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27335640Shselasky * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28335640Shselasky * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29335640Shselasky * 30335640Shselasky * Bluetooth sniffing API implementation for Linux platform 31335640Shselasky * By Paolo Abeni <paolo.abeni@email.it> 32335640Shselasky * 33335640Shselasky */ 34335640Shselasky 35335640Shselasky#ifdef HAVE_CONFIG_H 36335640Shselasky#include <config.h> 37335640Shselasky#endif 38335640Shselasky 39335640Shselasky#include "pcap-int.h" 40335640Shselasky#include "pcap-bt-linux.h" 41335640Shselasky#include "pcap/bluetooth.h" 42335640Shselasky 43335640Shselasky#include <errno.h> 44335640Shselasky#include <stdlib.h> 45335640Shselasky#include <unistd.h> 46335640Shselasky#include <fcntl.h> 47335640Shselasky#include <string.h> 48335640Shselasky#include <sys/ioctl.h> 49335640Shselasky#include <sys/socket.h> 50335640Shselasky#include <arpa/inet.h> 51335640Shselasky 52335640Shselasky#include <bluetooth/bluetooth.h> 53335640Shselasky#include <bluetooth/hci.h> 54335640Shselasky 55335640Shselasky#define BT_IFACE "bluetooth" 56335640Shselasky#define BT_CTRL_SIZE 128 57335640Shselasky 58335640Shselasky/* forward declaration */ 59335640Shselaskystatic int bt_activate(pcap_t *); 60335640Shselaskystatic int bt_read_linux(pcap_t *, int , pcap_handler , u_char *); 61335640Shselaskystatic int bt_inject_linux(pcap_t *, const void *, size_t); 62335640Shselaskystatic int bt_setdirection_linux(pcap_t *, pcap_direction_t); 63335640Shselaskystatic int bt_stats_linux(pcap_t *, struct pcap_stat *); 64335640Shselasky 65335640Shselasky/* 66335640Shselasky * Private data for capturing on Linux Bluetooth devices. 67335640Shselasky */ 68335640Shselaskystruct pcap_bt { 69335640Shselasky int dev_id; /* device ID of device we're bound to */ 70335640Shselasky}; 71335640Shselasky 72335640Shselaskyint 73335640Shselaskybt_findalldevs(pcap_if_list_t *devlistp, char *err_str) 74335640Shselasky{ 75335640Shselasky struct hci_dev_list_req *dev_list; 76335640Shselasky struct hci_dev_req *dev_req; 77356341Scy int sock; 78356341Scy unsigned i; 79335640Shselasky int ret = 0; 80335640Shselasky 81335640Shselasky sock = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI); 82335640Shselasky if (sock < 0) 83335640Shselasky { 84356341Scy /* if bluetooth is not supported this is not fatal*/ 85335640Shselasky if (errno == EAFNOSUPPORT) 86335640Shselasky return 0; 87335640Shselasky pcap_fmt_errmsg_for_errno(err_str, PCAP_ERRBUF_SIZE, 88335640Shselasky errno, "Can't open raw Bluetooth socket"); 89335640Shselasky return -1; 90335640Shselasky } 91335640Shselasky 92335640Shselasky dev_list = malloc(HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list)); 93335640Shselasky if (!dev_list) 94335640Shselasky { 95335640Shselasky pcap_snprintf(err_str, PCAP_ERRBUF_SIZE, "Can't allocate %zu bytes for Bluetooth device list", 96335640Shselasky HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list)); 97335640Shselasky ret = -1; 98335640Shselasky goto done; 99335640Shselasky } 100335640Shselasky 101335640Shselasky dev_list->dev_num = HCI_MAX_DEV; 102335640Shselasky 103335640Shselasky if (ioctl(sock, HCIGETDEVLIST, (void *) dev_list) < 0) 104335640Shselasky { 105335640Shselasky pcap_fmt_errmsg_for_errno(err_str, PCAP_ERRBUF_SIZE, 106335640Shselasky errno, "Can't get Bluetooth device list via ioctl"); 107335640Shselasky ret = -1; 108335640Shselasky goto free; 109335640Shselasky } 110335640Shselasky 111335640Shselasky dev_req = dev_list->dev_req; 112335640Shselasky for (i = 0; i < dev_list->dev_num; i++, dev_req++) { 113356341Scy char dev_name[20], dev_descr[40]; 114335640Shselasky 115356341Scy pcap_snprintf(dev_name, sizeof(dev_name), BT_IFACE"%u", dev_req->dev_id); 116356341Scy pcap_snprintf(dev_descr, sizeof(dev_descr), "Bluetooth adapter number %u", i); 117335640Shselasky 118335640Shselasky /* 119335640Shselasky * Bluetooth is a wireless technology. 120335640Shselasky * XXX - if there's the notion of associating with a 121335640Shselasky * network, and we can determine whether the interface 122335640Shselasky * is associated with a network, check that and set 123335640Shselasky * the status to PCAP_IF_CONNECTION_STATUS_CONNECTED 124335640Shselasky * or PCAP_IF_CONNECTION_STATUS_DISCONNECTED. 125335640Shselasky */ 126335640Shselasky if (add_dev(devlistp, dev_name, PCAP_IF_WIRELESS, dev_descr, err_str) == NULL) 127335640Shselasky { 128335640Shselasky ret = -1; 129335640Shselasky break; 130335640Shselasky } 131335640Shselasky } 132335640Shselasky 133335640Shselaskyfree: 134335640Shselasky free(dev_list); 135335640Shselasky 136335640Shselaskydone: 137335640Shselasky close(sock); 138335640Shselasky return ret; 139335640Shselasky} 140335640Shselasky 141335640Shselaskypcap_t * 142335640Shselaskybt_create(const char *device, char *ebuf, int *is_ours) 143335640Shselasky{ 144335640Shselasky const char *cp; 145335640Shselasky char *cpend; 146335640Shselasky long devnum; 147335640Shselasky pcap_t *p; 148335640Shselasky 149335640Shselasky /* Does this look like a Bluetooth device? */ 150335640Shselasky cp = strrchr(device, '/'); 151335640Shselasky if (cp == NULL) 152335640Shselasky cp = device; 153335640Shselasky /* Does it begin with BT_IFACE? */ 154335640Shselasky if (strncmp(cp, BT_IFACE, sizeof BT_IFACE - 1) != 0) { 155335640Shselasky /* Nope, doesn't begin with BT_IFACE */ 156335640Shselasky *is_ours = 0; 157335640Shselasky return NULL; 158335640Shselasky } 159335640Shselasky /* Yes - is BT_IFACE followed by a number? */ 160335640Shselasky cp += sizeof BT_IFACE - 1; 161335640Shselasky devnum = strtol(cp, &cpend, 10); 162335640Shselasky if (cpend == cp || *cpend != '\0') { 163335640Shselasky /* Not followed by a number. */ 164335640Shselasky *is_ours = 0; 165335640Shselasky return NULL; 166335640Shselasky } 167335640Shselasky if (devnum < 0) { 168335640Shselasky /* Followed by a non-valid number. */ 169335640Shselasky *is_ours = 0; 170335640Shselasky return NULL; 171335640Shselasky } 172335640Shselasky 173335640Shselasky /* OK, it's probably ours. */ 174335640Shselasky *is_ours = 1; 175335640Shselasky 176335640Shselasky p = pcap_create_common(ebuf, sizeof (struct pcap_bt)); 177335640Shselasky if (p == NULL) 178335640Shselasky return (NULL); 179335640Shselasky 180335640Shselasky p->activate_op = bt_activate; 181335640Shselasky return (p); 182335640Shselasky} 183335640Shselasky 184335640Shselaskystatic int 185335640Shselaskybt_activate(pcap_t* handle) 186335640Shselasky{ 187335640Shselasky struct pcap_bt *handlep = handle->priv; 188335640Shselasky struct sockaddr_hci addr; 189335640Shselasky int opt; 190335640Shselasky int dev_id; 191335640Shselasky struct hci_filter flt; 192335640Shselasky int err = PCAP_ERROR; 193335640Shselasky 194335640Shselasky /* get bt interface id */ 195335640Shselasky if (sscanf(handle->opt.device, BT_IFACE"%d", &dev_id) != 1) 196335640Shselasky { 197335640Shselasky pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, 198335640Shselasky "Can't get Bluetooth device index from %s", 199335640Shselasky handle->opt.device); 200335640Shselasky return PCAP_ERROR; 201335640Shselasky } 202335640Shselasky 203335640Shselasky /* 204335640Shselasky * Turn a negative snapshot value (invalid), a snapshot value of 205335640Shselasky * 0 (unspecified), or a value bigger than the normal maximum 206335640Shselasky * value, into the maximum allowed value. 207335640Shselasky * 208335640Shselasky * If some application really *needs* a bigger snapshot 209335640Shselasky * length, we should just increase MAXIMUM_SNAPLEN. 210335640Shselasky */ 211335640Shselasky if (handle->snapshot <= 0 || handle->snapshot > MAXIMUM_SNAPLEN) 212335640Shselasky handle->snapshot = MAXIMUM_SNAPLEN; 213335640Shselasky 214335640Shselasky /* Initialize some components of the pcap structure. */ 215335640Shselasky handle->bufsize = BT_CTRL_SIZE+sizeof(pcap_bluetooth_h4_header)+handle->snapshot; 216335640Shselasky handle->linktype = DLT_BLUETOOTH_HCI_H4_WITH_PHDR; 217335640Shselasky 218335640Shselasky handle->read_op = bt_read_linux; 219335640Shselasky handle->inject_op = bt_inject_linux; 220335640Shselasky handle->setfilter_op = install_bpf_program; /* no kernel filtering */ 221335640Shselasky handle->setdirection_op = bt_setdirection_linux; 222335640Shselasky handle->set_datalink_op = NULL; /* can't change data link type */ 223335640Shselasky handle->getnonblock_op = pcap_getnonblock_fd; 224335640Shselasky handle->setnonblock_op = pcap_setnonblock_fd; 225335640Shselasky handle->stats_op = bt_stats_linux; 226335640Shselasky handlep->dev_id = dev_id; 227335640Shselasky 228335640Shselasky /* Create HCI socket */ 229335640Shselasky handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI); 230335640Shselasky if (handle->fd < 0) { 231335640Shselasky pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, 232335640Shselasky errno, "Can't create raw socket"); 233335640Shselasky return PCAP_ERROR; 234335640Shselasky } 235335640Shselasky 236335640Shselasky handle->buffer = malloc(handle->bufsize); 237335640Shselasky if (!handle->buffer) { 238335640Shselasky pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, 239335640Shselasky errno, "Can't allocate dump buffer"); 240335640Shselasky goto close_fail; 241335640Shselasky } 242335640Shselasky 243335640Shselasky opt = 1; 244335640Shselasky if (setsockopt(handle->fd, SOL_HCI, HCI_DATA_DIR, &opt, sizeof(opt)) < 0) { 245335640Shselasky pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, 246335640Shselasky errno, "Can't enable data direction info"); 247335640Shselasky goto close_fail; 248335640Shselasky } 249335640Shselasky 250335640Shselasky opt = 1; 251335640Shselasky if (setsockopt(handle->fd, SOL_HCI, HCI_TIME_STAMP, &opt, sizeof(opt)) < 0) { 252335640Shselasky pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, 253335640Shselasky errno, "Can't enable time stamp"); 254335640Shselasky goto close_fail; 255335640Shselasky } 256335640Shselasky 257335640Shselasky /* Setup filter, do not call hci function to avoid dependence on 258335640Shselasky * external libs */ 259335640Shselasky memset(&flt, 0, sizeof(flt)); 260335640Shselasky memset((void *) &flt.type_mask, 0xff, sizeof(flt.type_mask)); 261335640Shselasky memset((void *) &flt.event_mask, 0xff, sizeof(flt.event_mask)); 262335640Shselasky if (setsockopt(handle->fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) { 263335640Shselasky pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, 264335640Shselasky errno, "Can't set filter"); 265335640Shselasky goto close_fail; 266335640Shselasky } 267335640Shselasky 268335640Shselasky 269335640Shselasky /* Bind socket to the HCI device */ 270335640Shselasky addr.hci_family = AF_BLUETOOTH; 271335640Shselasky addr.hci_dev = handlep->dev_id; 272335640Shselasky#ifdef HAVE_STRUCT_SOCKADDR_HCI_HCI_CHANNEL 273335640Shselasky addr.hci_channel = HCI_CHANNEL_RAW; 274335640Shselasky#endif 275335640Shselasky if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { 276335640Shselasky pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, 277335640Shselasky errno, "Can't attach to device %d", handlep->dev_id); 278335640Shselasky goto close_fail; 279335640Shselasky } 280335640Shselasky 281335640Shselasky if (handle->opt.rfmon) { 282335640Shselasky /* 283335640Shselasky * Monitor mode doesn't apply to Bluetooth devices. 284335640Shselasky */ 285335640Shselasky err = PCAP_ERROR_RFMON_NOTSUP; 286335640Shselasky goto close_fail; 287335640Shselasky } 288335640Shselasky 289335640Shselasky if (handle->opt.buffer_size != 0) { 290335640Shselasky /* 291335640Shselasky * Set the socket buffer size to the specified value. 292335640Shselasky */ 293335640Shselasky if (setsockopt(handle->fd, SOL_SOCKET, SO_RCVBUF, 294335640Shselasky &handle->opt.buffer_size, 295335640Shselasky sizeof(handle->opt.buffer_size)) == -1) { 296335640Shselasky pcap_fmt_errmsg_for_errno(handle->errbuf, 297335640Shselasky errno, PCAP_ERRBUF_SIZE, "SO_RCVBUF"); 298335640Shselasky goto close_fail; 299335640Shselasky } 300335640Shselasky } 301335640Shselasky 302335640Shselasky handle->selectable_fd = handle->fd; 303335640Shselasky return 0; 304335640Shselasky 305335640Shselaskyclose_fail: 306335640Shselasky pcap_cleanup_live_common(handle); 307335640Shselasky return err; 308335640Shselasky} 309335640Shselasky 310335640Shselaskystatic int 311335640Shselaskybt_read_linux(pcap_t *handle, int max_packets _U_, pcap_handler callback, u_char *user) 312335640Shselasky{ 313335640Shselasky struct cmsghdr *cmsg; 314335640Shselasky struct msghdr msg; 315335640Shselasky struct iovec iv; 316335640Shselasky ssize_t ret; 317335640Shselasky struct pcap_pkthdr pkth; 318335640Shselasky pcap_bluetooth_h4_header* bthdr; 319335640Shselasky u_char *pktd; 320335640Shselasky int in = 0; 321335640Shselasky 322335640Shselasky pktd = (u_char *)handle->buffer + BT_CTRL_SIZE; 323335640Shselasky bthdr = (pcap_bluetooth_h4_header*)(void *)pktd; 324335640Shselasky iv.iov_base = pktd + sizeof(pcap_bluetooth_h4_header); 325335640Shselasky iv.iov_len = handle->snapshot; 326335640Shselasky 327335640Shselasky memset(&msg, 0, sizeof(msg)); 328335640Shselasky msg.msg_iov = &iv; 329335640Shselasky msg.msg_iovlen = 1; 330335640Shselasky msg.msg_control = handle->buffer; 331335640Shselasky msg.msg_controllen = BT_CTRL_SIZE; 332335640Shselasky 333335640Shselasky /* ignore interrupt system call error */ 334335640Shselasky do { 335335640Shselasky ret = recvmsg(handle->fd, &msg, 0); 336335640Shselasky if (handle->break_loop) 337335640Shselasky { 338335640Shselasky handle->break_loop = 0; 339335640Shselasky return -2; 340335640Shselasky } 341335640Shselasky } while ((ret == -1) && (errno == EINTR)); 342335640Shselasky 343335640Shselasky if (ret < 0) { 344335640Shselasky pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, 345335640Shselasky errno, "Can't receive packet"); 346335640Shselasky return -1; 347335640Shselasky } 348335640Shselasky 349335640Shselasky pkth.caplen = ret; 350335640Shselasky 351335640Shselasky /* get direction and timestamp*/ 352335640Shselasky cmsg = CMSG_FIRSTHDR(&msg); 353335640Shselasky while (cmsg) { 354335640Shselasky switch (cmsg->cmsg_type) { 355335640Shselasky case HCI_CMSG_DIR: 356335640Shselasky memcpy(&in, CMSG_DATA(cmsg), sizeof in); 357335640Shselasky break; 358335640Shselasky case HCI_CMSG_TSTAMP: 359335640Shselasky memcpy(&pkth.ts, CMSG_DATA(cmsg), 360335640Shselasky sizeof pkth.ts); 361335640Shselasky break; 362335640Shselasky } 363335640Shselasky cmsg = CMSG_NXTHDR(&msg, cmsg); 364335640Shselasky } 365335640Shselasky if ((in && (handle->direction == PCAP_D_OUT)) || 366335640Shselasky ((!in) && (handle->direction == PCAP_D_IN))) 367335640Shselasky return 0; 368335640Shselasky 369335640Shselasky bthdr->direction = htonl(in != 0); 370335640Shselasky pkth.caplen+=sizeof(pcap_bluetooth_h4_header); 371335640Shselasky pkth.len = pkth.caplen; 372335640Shselasky if (handle->fcode.bf_insns == NULL || 373335640Shselasky bpf_filter(handle->fcode.bf_insns, pktd, pkth.len, pkth.caplen)) { 374335640Shselasky callback(user, &pkth, pktd); 375335640Shselasky return 1; 376335640Shselasky } 377335640Shselasky return 0; /* didn't pass filter */ 378335640Shselasky} 379335640Shselasky 380335640Shselaskystatic int 381335640Shselaskybt_inject_linux(pcap_t *handle, const void *buf _U_, size_t size _U_) 382335640Shselasky{ 383356341Scy pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, 384356341Scy "Packet injection is not supported on Bluetooth devices"); 385335640Shselasky return (-1); 386335640Shselasky} 387335640Shselasky 388335640Shselasky 389335640Shselaskystatic int 390335640Shselaskybt_stats_linux(pcap_t *handle, struct pcap_stat *stats) 391335640Shselasky{ 392335640Shselasky struct pcap_bt *handlep = handle->priv; 393335640Shselasky int ret; 394335640Shselasky struct hci_dev_info dev_info; 395335640Shselasky struct hci_dev_stats * s = &dev_info.stat; 396335640Shselasky dev_info.dev_id = handlep->dev_id; 397335640Shselasky 398335640Shselasky /* ignore eintr */ 399335640Shselasky do { 400335640Shselasky ret = ioctl(handle->fd, HCIGETDEVINFO, (void *)&dev_info); 401335640Shselasky } while ((ret == -1) && (errno == EINTR)); 402335640Shselasky 403335640Shselasky if (ret < 0) { 404335640Shselasky pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, 405335640Shselasky errno, "Can't get stats via ioctl"); 406335640Shselasky return (-1); 407335640Shselasky 408335640Shselasky } 409335640Shselasky 410335640Shselasky /* we receive both rx and tx frames, so comulate all stats */ 411335640Shselasky stats->ps_recv = s->evt_rx + s->acl_rx + s->sco_rx + s->cmd_tx + 412335640Shselasky s->acl_tx +s->sco_tx; 413335640Shselasky stats->ps_drop = s->err_rx + s->err_tx; 414335640Shselasky stats->ps_ifdrop = 0; 415335640Shselasky return 0; 416335640Shselasky} 417335640Shselasky 418335640Shselaskystatic int 419335640Shselaskybt_setdirection_linux(pcap_t *p, pcap_direction_t d) 420335640Shselasky{ 421335640Shselasky p->direction = d; 422335640Shselasky return 0; 423335640Shselasky} 424