/* * Copyright (c) 2006 Paolo Abeni (Italy) * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote * products derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Bluetooth sniffing API implementation for Linux platform * By Paolo Abeni * */ #ifndef lint static const char rcsid[] _U_ = "@(#) $Header: /tcpdump/master/libpcap/pcap-bt-linux.c,v 1.9.2.6 2008-07-01 07:06:37 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "pcap-int.h" #include "pcap-bt-linux.h" #include "pcap/bluetooth.h" #ifdef NEED_STRERROR_H #include "strerror.h" #endif #include #include #include #include #include #include #include #include #include #include #define BT_IFACE "bluetooth" #define BT_CTRL_SIZE 128 /* forward declaration */ static int bt_activate(pcap_t *); static int bt_read_linux(pcap_t *, int , pcap_handler , u_char *); static int bt_inject_linux(pcap_t *, const void *, size_t); static int bt_setfilter_linux(pcap_t *, struct bpf_program *); static int bt_setdirection_linux(pcap_t *, pcap_direction_t); static int bt_stats_linux(pcap_t *, struct pcap_stat *); int bt_platform_finddevs(pcap_if_t **alldevsp, char *err_str) { pcap_if_t *found_dev = *alldevsp; struct hci_dev_list_req *dev_list; struct hci_dev_req *dev_req; int i, sock; int ret = 0; sock = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI); if (sock < 0) { /* if bluetooth is not supported this this is not fatal*/ if (errno == EAFNOSUPPORT) return 0; snprintf(err_str, PCAP_ERRBUF_SIZE, "Can't open raw Bluetooth socket %d:%s", errno, strerror(errno)); return -1; } dev_list = malloc(HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list)); if (!dev_list) { snprintf(err_str, PCAP_ERRBUF_SIZE, "Can't allocate %zu bytes for Bluetooth device list", HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list)); ret = -1; goto done; } dev_list->dev_num = HCI_MAX_DEV; if (ioctl(sock, HCIGETDEVLIST, (void *) dev_list) < 0) { snprintf(err_str, PCAP_ERRBUF_SIZE, "Can't get Bluetooth device list via ioctl %d:%s", errno, strerror(errno)); ret = -1; goto free; } dev_req = dev_list->dev_req; for (i = 0; i < dev_list->dev_num; i++, dev_req++) { char dev_name[20], dev_descr[30]; snprintf(dev_name, 20, BT_IFACE"%d", dev_req->dev_id); snprintf(dev_descr, 30, "Bluetooth adapter number %d", i); if (pcap_add_if(&found_dev, dev_name, 0, dev_descr, err_str) < 0) { ret = -1; break; } } free: free(dev_list); done: close(sock); return ret; } pcap_t * bt_create(const char *device, char *ebuf) { pcap_t *p; p = pcap_create_common(device, ebuf); if (p == NULL) return (NULL); p->activate_op = bt_activate; return (p); } static int bt_activate(pcap_t* handle) { struct sockaddr_hci addr; int opt; int dev_id; struct hci_filter flt; int err = PCAP_ERROR; /* get bt interface id */ if (sscanf(handle->opt.source, BT_IFACE"%d", &dev_id) != 1) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't get Bluetooth device index from %s", handle->opt.source); return PCAP_ERROR; } /* Initialize some components of the pcap structure. */ handle->bufsize = handle->snapshot+BT_CTRL_SIZE+sizeof(pcap_bluetooth_h4_header); handle->offset = BT_CTRL_SIZE; handle->linktype = DLT_BLUETOOTH_HCI_H4_WITH_PHDR; handle->read_op = bt_read_linux; handle->inject_op = bt_inject_linux; handle->setfilter_op = bt_setfilter_linux; handle->setdirection_op = bt_setdirection_linux; handle->set_datalink_op = NULL; /* can't change data link type */ handle->getnonblock_op = pcap_getnonblock_fd; handle->setnonblock_op = pcap_setnonblock_fd; handle->stats_op = bt_stats_linux; handle->md.ifindex = dev_id; /* Create HCI socket */ handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI); if (handle->fd < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't create raw socket %d:%s", errno, strerror(errno)); return PCAP_ERROR; } handle->buffer = malloc(handle->bufsize); if (!handle->buffer) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate dump buffer: %s", pcap_strerror(errno)); goto close_fail; } opt = 1; if (setsockopt(handle->fd, SOL_HCI, HCI_DATA_DIR, &opt, sizeof(opt)) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't enable data direction info %d:%s", errno, strerror(errno)); goto close_fail; } opt = 1; if (setsockopt(handle->fd, SOL_HCI, HCI_TIME_STAMP, &opt, sizeof(opt)) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't enable time stamp %d:%s", errno, strerror(errno)); goto close_fail; } /* Setup filter, do not call hci function to avoid dependence on * external libs */ memset(&flt, 0, sizeof(flt)); memset((void *) &flt.type_mask, 0xff, sizeof(flt.type_mask)); memset((void *) &flt.event_mask, 0xff, sizeof(flt.event_mask)); if (setsockopt(handle->fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't set filter %d:%s", errno, strerror(errno)); goto close_fail; } /* Bind socket to the HCI device */ addr.hci_family = AF_BLUETOOTH; addr.hci_dev = handle->md.ifindex; if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't attach to device %d %d:%s", handle->md.ifindex, errno, strerror(errno)); goto close_fail; } if (handle->opt.rfmon) { /* * Monitor mode doesn't apply to Bluetooth devices. */ err = PCAP_ERROR_RFMON_NOTSUP; goto close_fail; } if (handle->opt.buffer_size == 0) { /* * Set the socket buffer size to the specified value. */ if (setsockopt(handle->fd, SOL_SOCKET, SO_RCVBUF, &handle->opt.buffer_size, sizeof(handle->opt.buffer_size)) == -1) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "SO_RCVBUF: %s", pcap_strerror(errno)); goto close_fail; } } handle->selectable_fd = handle->fd; return 0; close_fail: pcap_cleanup_live_common(handle); return err; } static int bt_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) { struct cmsghdr *cmsg; struct msghdr msg; struct iovec iv; struct pcap_pkthdr pkth; pcap_bluetooth_h4_header* bthdr; bthdr = (pcap_bluetooth_h4_header*) &handle->buffer[handle->offset]; iv.iov_base = &handle->buffer[handle->offset+sizeof(pcap_bluetooth_h4_header)]; iv.iov_len = handle->snapshot; memset(&msg, 0, sizeof(msg)); msg.msg_iov = &iv; msg.msg_iovlen = 1; msg.msg_control = handle->buffer; msg.msg_controllen = handle->offset; /* ignore interrupt system call error */ do { pkth.caplen = recvmsg(handle->fd, &msg, 0); if (handle->break_loop) { handle->break_loop = 0; return -2; } } while ((pkth.caplen == -1) && (errno == EINTR)); if (pkth.caplen < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't receive packet %d:%s", errno, strerror(errno)); return -1; } /* get direction and timestamp*/ cmsg = CMSG_FIRSTHDR(&msg); int in=0; while (cmsg) { switch (cmsg->cmsg_type) { case HCI_CMSG_DIR: in = *((int *) CMSG_DATA(cmsg)); break; case HCI_CMSG_TSTAMP: pkth.ts = *((struct timeval *) CMSG_DATA(cmsg)); break; } cmsg = CMSG_NXTHDR(&msg, cmsg); } if ((in && (handle->direction == PCAP_D_OUT)) || ((!in) && (handle->direction == PCAP_D_IN))) return 0; bthdr->direction = htonl(in != 0); pkth.caplen+=sizeof(pcap_bluetooth_h4_header); pkth.len = pkth.caplen; callback(user, &pkth, &handle->buffer[handle->offset]); return 1; } static int bt_inject_linux(pcap_t *handle, const void *buf, size_t size) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on " "bluetooth devices"); return (-1); } static int bt_stats_linux(pcap_t *handle, struct pcap_stat *stats) { int ret; struct hci_dev_info dev_info; struct hci_dev_stats * s = &dev_info.stat; dev_info.dev_id = handle->md.ifindex; /* ingnore eintr */ do { ret = ioctl(handle->fd, HCIGETDEVINFO, (void *)&dev_info); } while ((ret == -1) && (errno == EINTR)); if (ret < 0) { snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "can get stats" " via ioctl %d:%s", errno, strerror(errno)); return (-1); } /* we receive both rx and tx frames, so comulate all stats */ stats->ps_recv = s->evt_rx + s->acl_rx + s->sco_rx + s->cmd_tx + s->acl_tx +s->sco_tx; stats->ps_drop = s->err_rx + s->err_tx; stats->ps_ifdrop = 0; return 0; } static int bt_setfilter_linux(pcap_t *p, struct bpf_program *fp) { return 0; } static int bt_setdirection_linux(pcap_t *p, pcap_direction_t d) { p->direction = d; return 0; }