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-rw-r--r--contrib/libpcap/pcap-bt-monitor-linux.c241
1 files changed, 241 insertions, 0 deletions
diff --git a/contrib/libpcap/pcap-bt-monitor-linux.c b/contrib/libpcap/pcap-bt-monitor-linux.c
new file mode 100644
index 0000000..76c9ee3
--- /dev/null
+++ b/contrib/libpcap/pcap-bt-monitor-linux.c
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+/*
+ * Copyright (c) 2014 Michal Labedzki for Tieto Corporation
+ * 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.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <bluetooth/bluetooth.h>
+#include <bluetooth/hci.h>
+#include <bluetooth/mgmt.h>
+
+#include "pcap/bluetooth.h"
+#include "pcap-int.h"
+
+#define BT_CONTROL_SIZE 32
+#define INTERFACE_NAME "bluetooth-monitor"
+
+int
+bt_monitor_findalldevs(pcap_if_t **alldevsp, char *err_str)
+{
+ int ret = 0;
+
+ if (pcap_add_if(alldevsp, INTERFACE_NAME, 0,
+ "Bluetooth Linux Monitor", err_str) < 0)
+ {
+ ret = -1;
+ }
+
+ return ret;
+}
+
+static int
+bt_monitor_read(pcap_t *handle, int max_packets _U_, pcap_handler callback, u_char *user)
+{
+ struct cmsghdr *cmsg;
+ struct msghdr msg;
+ struct iovec iv[2];
+ ssize_t ret;
+ struct pcap_pkthdr pkth;
+ pcap_bluetooth_linux_monitor_header *bthdr;
+ struct mgmt_hdr hdr;
+ int in = 0;
+
+ bthdr = (pcap_bluetooth_linux_monitor_header*) &handle->buffer[handle->offset];
+
+ iv[0].iov_base = &hdr;
+ iv[0].iov_len = MGMT_HDR_SIZE;
+ iv[1].iov_base = &handle->buffer[handle->offset + sizeof(pcap_bluetooth_linux_monitor_header)];
+ iv[1].iov_len = handle->snapshot;
+
+ memset(&pkth.ts, 0, sizeof(pkth.ts));
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_iov = iv;
+ msg.msg_iovlen = 2;
+ msg.msg_control = handle->buffer;
+ msg.msg_controllen = handle->offset;
+
+ do {
+ ret = recvmsg(handle->fd, &msg, 0);
+ if (handle->break_loop)
+ {
+ handle->break_loop = 0;
+ return -2;
+ }
+ } while ((ret == -1) && (errno == EINTR));
+
+ if (ret < 0) {
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "Can't receive packet: %s", strerror(errno));
+ return -1;
+ }
+
+ pkth.caplen = ret - MGMT_HDR_SIZE + sizeof(pcap_bluetooth_linux_monitor_header);
+ pkth.len = pkth.caplen;
+
+ for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+ if (cmsg->cmsg_level != SOL_SOCKET) continue;
+
+ if (cmsg->cmsg_type == SCM_TIMESTAMP) {
+ memcpy(&pkth.ts, CMSG_DATA(cmsg), sizeof(pkth.ts));
+ }
+ }
+
+ bthdr->adapter_id = htons(hdr.index);
+ bthdr->opcode = htons(hdr.opcode);
+
+ if (handle->fcode.bf_insns == NULL ||
+ bpf_filter(handle->fcode.bf_insns, &handle->buffer[handle->offset],
+ pkth.len, pkth.caplen)) {
+ callback(user, &pkth, &handle->buffer[handle->offset]);
+ return 1;
+ }
+ return 0; /* didn't pass filter */
+}
+
+static int
+bt_monitor_inject(pcap_t *handle, const void *buf _U_, size_t size _U_)
+{
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported yet");
+ return -1;
+}
+
+static int
+bt_monitor_setdirection(pcap_t *p, pcap_direction_t d)
+{
+ p->direction = d;
+ return 0;
+}
+
+static int
+bt_monitor_stats(pcap_t *handle _U_, struct pcap_stat *stats)
+{
+ stats->ps_recv = 0;
+ stats->ps_drop = 0;
+ stats->ps_ifdrop = 0;
+
+ return 0;
+}
+
+static int
+bt_monitor_activate(pcap_t* handle)
+{
+ struct sockaddr_hci addr;
+ int err = PCAP_ERROR;
+ int opt;
+
+ if (handle->opt.rfmon) {
+ /* monitor mode doesn't apply here */
+ return PCAP_ERROR_RFMON_NOTSUP;
+ }
+
+ handle->bufsize = handle->snapshot + BT_CONTROL_SIZE + sizeof(pcap_bluetooth_linux_monitor_header);
+ handle->offset = BT_CONTROL_SIZE;
+ handle->linktype = DLT_BLUETOOTH_LINUX_MONITOR;
+
+ handle->read_op = bt_monitor_read;
+ handle->inject_op = bt_monitor_inject;
+ handle->setfilter_op = install_bpf_program; /* no kernel filtering */
+ handle->setdirection_op = bt_monitor_setdirection;
+ 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_monitor_stats;
+
+ handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
+ if (handle->fd < 0) {
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "Can't create raw socket: %s", 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;
+ }
+
+ /* Bind socket to the HCI device */
+ addr.hci_family = AF_BLUETOOTH;
+ addr.hci_dev = HCI_DEV_NONE;
+ addr.hci_channel = HCI_CHANNEL_MONITOR;
+
+ if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "Can't attach to interface: %s", strerror(errno));
+ goto close_fail;
+ }
+
+ opt = 1;
+ if (setsockopt(handle->fd, SOL_SOCKET, SO_TIMESTAMP, &opt, sizeof(opt)) < 0) {
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "Can't enable time stamp: %s", strerror(errno));
+ goto close_fail;
+ }
+
+ handle->selectable_fd = handle->fd;
+
+ return 0;
+
+close_fail:
+ pcap_cleanup_live_common(handle);
+ return err;
+}
+
+pcap_t *
+bt_monitor_create(const char *device, char *ebuf, int *is_ours)
+{
+ pcap_t *p;
+ const char *cp;
+
+ cp = strrchr(device, '/');
+ if (cp == NULL)
+ cp = device;
+
+ if (strcmp(cp, INTERFACE_NAME) != 0) {
+ *is_ours = 0;
+ return NULL;
+ }
+
+ *is_ours = 1;
+ p = pcap_create_common(device, ebuf, 0);
+ if (p == NULL)
+ return NULL;
+
+ p->activate_op = bt_monitor_activate;
+
+ return p;
+}
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