243 lines
6.8 KiB
C
Executable File
243 lines
6.8 KiB
C
Executable File
/*
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* Copyright (c) 2014 Michal Labedzki for Tieto Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <bluetooth/bluetooth.h>
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#include <bluetooth/hci.h>
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#include <bluetooth/mgmt.h>
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#include "pcap/bluetooth.h"
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#include "pcap-int.h"
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#include "pcap-bt-monitor-linux.h"
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#define BT_CONTROL_SIZE 32
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#define INTERFACE_NAME "bluetooth-monitor"
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int
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bt_monitor_findalldevs(pcap_if_t **alldevsp, char *err_str)
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{
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int ret = 0;
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if (pcap_add_if(alldevsp, INTERFACE_NAME, 0,
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"Bluetooth Linux Monitor", err_str) < 0)
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{
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ret = -1;
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}
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return ret;
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}
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static int
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bt_monitor_read(pcap_t *handle, int max_packets _U_, pcap_handler callback, u_char *user)
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{
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struct cmsghdr *cmsg;
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struct msghdr msg;
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struct iovec iv[2];
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ssize_t ret;
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struct pcap_pkthdr pkth;
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pcap_bluetooth_linux_monitor_header *bthdr;
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struct mgmt_hdr hdr;
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bthdr = (pcap_bluetooth_linux_monitor_header*) &handle->buffer[handle->offset];
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iv[0].iov_base = &hdr;
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iv[0].iov_len = MGMT_HDR_SIZE;
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iv[1].iov_base = &handle->buffer[handle->offset + sizeof(pcap_bluetooth_linux_monitor_header)];
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iv[1].iov_len = handle->snapshot;
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memset(&pkth.ts, 0, sizeof(pkth.ts));
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memset(&msg, 0, sizeof(msg));
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msg.msg_iov = iv;
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msg.msg_iovlen = 2;
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msg.msg_control = handle->buffer;
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msg.msg_controllen = handle->offset;
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do {
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ret = recvmsg(handle->fd, &msg, 0);
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if (handle->break_loop)
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{
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handle->break_loop = 0;
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return -2;
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}
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} while ((ret == -1) && (errno == EINTR));
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if (ret < 0) {
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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
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"Can't receive packet: %s", strerror(errno));
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return -1;
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}
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pkth.caplen = ret - MGMT_HDR_SIZE + sizeof(pcap_bluetooth_linux_monitor_header);
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pkth.len = pkth.caplen;
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for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
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if (cmsg->cmsg_level != SOL_SOCKET) continue;
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if (cmsg->cmsg_type == SCM_TIMESTAMP) {
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memcpy(&pkth.ts, CMSG_DATA(cmsg), sizeof(pkth.ts));
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}
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}
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bthdr->adapter_id = htons(hdr.index);
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bthdr->opcode = htons(hdr.opcode);
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if (handle->fcode.bf_insns == NULL ||
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bpf_filter(handle->fcode.bf_insns, &handle->buffer[handle->offset],
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pkth.len, pkth.caplen)) {
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callback(user, &pkth, &handle->buffer[handle->offset]);
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return 1;
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}
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return 0; /* didn't pass filter */
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}
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static int
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bt_monitor_inject(pcap_t *handle, const void *buf _U_, size_t size _U_)
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{
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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported yet");
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return -1;
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}
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static int
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bt_monitor_setdirection(pcap_t *p, pcap_direction_t d)
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{
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p->direction = d;
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return 0;
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}
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static int
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bt_monitor_stats(pcap_t *handle _U_, struct pcap_stat *stats)
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{
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stats->ps_recv = 0;
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stats->ps_drop = 0;
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stats->ps_ifdrop = 0;
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return 0;
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}
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static int
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bt_monitor_activate(pcap_t* handle)
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{
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struct sockaddr_hci addr;
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int err = PCAP_ERROR;
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int opt;
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if (handle->opt.rfmon) {
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/* monitor mode doesn't apply here */
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return PCAP_ERROR_RFMON_NOTSUP;
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}
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handle->bufsize = handle->snapshot + BT_CONTROL_SIZE + sizeof(pcap_bluetooth_linux_monitor_header);
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handle->offset = BT_CONTROL_SIZE;
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handle->linktype = DLT_BLUETOOTH_LINUX_MONITOR;
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handle->read_op = bt_monitor_read;
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handle->inject_op = bt_monitor_inject;
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handle->setfilter_op = install_bpf_program; /* no kernel filtering */
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handle->setdirection_op = bt_monitor_setdirection;
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handle->set_datalink_op = NULL; /* can't change data link type */
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handle->getnonblock_op = pcap_getnonblock_fd;
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handle->setnonblock_op = pcap_setnonblock_fd;
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handle->stats_op = bt_monitor_stats;
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handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
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if (handle->fd < 0) {
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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
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"Can't create raw socket: %s", strerror(errno));
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return PCAP_ERROR;
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}
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handle->buffer = malloc(handle->bufsize);
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if (!handle->buffer) {
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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate dump buffer: %s",
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pcap_strerror(errno));
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goto close_fail;
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}
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/* Bind socket to the HCI device */
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addr.hci_family = AF_BLUETOOTH;
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addr.hci_dev = HCI_DEV_NONE;
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addr.hci_channel = HCI_CHANNEL_MONITOR;
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if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
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"Can't attach to interface: %s", strerror(errno));
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goto close_fail;
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}
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opt = 1;
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if (setsockopt(handle->fd, SOL_SOCKET, SO_TIMESTAMP, &opt, sizeof(opt)) < 0) {
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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
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"Can't enable time stamp: %s", strerror(errno));
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goto close_fail;
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}
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handle->selectable_fd = handle->fd;
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return 0;
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close_fail:
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pcap_cleanup_live_common(handle);
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return err;
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}
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pcap_t *
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bt_monitor_create(const char *device, char *ebuf, int *is_ours)
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{
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pcap_t *p;
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const char *cp;
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cp = strrchr(device, '/');
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if (cp == NULL)
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cp = device;
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if (strcmp(cp, INTERFACE_NAME) != 0) {
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*is_ours = 0;
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return NULL;
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}
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*is_ours = 1;
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p = pcap_create_common(device, ebuf, 0);
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if (p == NULL)
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return NULL;
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p->activate_op = bt_monitor_activate;
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return p;
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}
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