1 files changed, 423 insertions, 0 deletions
diff --git a/lib/libpcap/libpcap/pcap-bt-linux.c b/lib/libpcap/libpcap/pcap-bt-linux.c
new file mode 100644
index 0000000..9c8712e
--- /dev/null
+++ b/lib/libpcap/libpcap/pcap-bt-linux.c
@@ -0,0 +1,423 @@
+/*
+ * 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 <paolo.abeni@email.it>
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "pcap-int.h"
+#include "pcap-bt-linux.h"
+#include "pcap/bluetooth.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+#include <bluetooth/bluetooth.h>
+#include <bluetooth/hci.h>
+
+#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_setdirection_linux(pcap_t *, pcap_direction_t);
+static int bt_stats_linux(pcap_t *, struct pcap_stat *);
+
+/*
+ * Private data for capturing on Linux Bluetooth devices.
+ */
+struct pcap_bt {
+	int dev_id;		/* device ID of device we're bound to */
+};
+
+int
+bt_findalldevs(pcap_if_list_t *devlistp, char *err_str)
+{
+	struct hci_dev_list_req *dev_list;
+	struct hci_dev_req *dev_req;
+	int sock;
+	unsigned i;
+	int ret = 0;
+
+	sock  = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
+	if (sock < 0)
+	{
+		/* if bluetooth is not supported this is not fatal*/
+		if (errno == EAFNOSUPPORT)
+			return 0;
+		pcap_fmt_errmsg_for_errno(err_str, PCAP_ERRBUF_SIZE,
+		    errno, "Can't open raw Bluetooth socket");
+		return -1;
+	}
+
+	dev_list = malloc(HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list));
+	if (!dev_list)
+	{
+		pcap_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)
+	{
+		pcap_fmt_errmsg_for_errno(err_str, PCAP_ERRBUF_SIZE,
+		    errno, "Can't get Bluetooth device list via ioctl");
+		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[40];
+
+		pcap_snprintf(dev_name, sizeof(dev_name), BT_IFACE"%u", dev_req->dev_id);
+		pcap_snprintf(dev_descr, sizeof(dev_descr), "Bluetooth adapter number %u", i);
+
+		/*
+		 * Bluetooth is a wireless technology.
+		 * XXX - if there's the notion of associating with a
+		 * network, and we can determine whether the interface
+		 * is associated with a network, check that and set
+		 * the status to PCAP_IF_CONNECTION_STATUS_CONNECTED
+		 * or PCAP_IF_CONNECTION_STATUS_DISCONNECTED.
+		 */
+		if (add_dev(devlistp, dev_name, PCAP_IF_WIRELESS, dev_descr, err_str)  == NULL)
+		{
+			ret = -1;
+			break;
+		}
+	}
+
+free:
+	free(dev_list);
+
+done:
+	close(sock);
+	return ret;
+}
+
+pcap_t *
+bt_create(const char *device, char *ebuf, int *is_ours)
+{
+	const char *cp;
+	char *cpend;
+	long devnum;
+	pcap_t *p;
+
+	/* Does this look like a Bluetooth device? */
+	cp = strrchr(device, '/');
+	if (cp == NULL)
+		cp = device;
+	/* Does it begin with BT_IFACE? */
+	if (strncmp(cp, BT_IFACE, sizeof BT_IFACE - 1) != 0) {
+		/* Nope, doesn't begin with BT_IFACE */
+		*is_ours = 0;
+		return NULL;
+	}
+	/* Yes - is BT_IFACE followed by a number? */
+	cp += sizeof BT_IFACE - 1;
+	devnum = strtol(cp, &cpend, 10);
+	if (cpend == cp || *cpend != '\0') {
+		/* Not followed by a number. */
+		*is_ours = 0;
+		return NULL;
+	}
+	if (devnum < 0) {
+		/* Followed by a non-valid number. */
+		*is_ours = 0;
+		return NULL;
+	}
+
+	/* OK, it's probably ours. */
+	*is_ours = 1;
+
+	p = pcap_create_common(ebuf, sizeof (struct pcap_bt));
+	if (p == NULL)
+		return (NULL);
+
+	p->activate_op = bt_activate;
+	return (p);
+}
+
+static int
+bt_activate(pcap_t* handle)
+{
+	struct pcap_bt *handlep = handle->priv;
+	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.device, BT_IFACE"%d", &dev_id) != 1)
+	{
+		pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+			"Can't get Bluetooth device index from %s",
+			 handle->opt.device);
+		return PCAP_ERROR;
+	}
+
+	/*
+	 * Turn a negative snapshot value (invalid), a snapshot value of
+	 * 0 (unspecified), or a value bigger than the normal maximum
+	 * value, into the maximum allowed value.
+	 *
+	 * If some application really *needs* a bigger snapshot
+	 * length, we should just increase MAXIMUM_SNAPLEN.
+	 */
+	if (handle->snapshot <= 0 || handle->snapshot > MAXIMUM_SNAPLEN)
+		handle->snapshot = MAXIMUM_SNAPLEN;
+
+	/* Initialize some components of the pcap structure. */
+	handle->bufsize = BT_CTRL_SIZE+sizeof(pcap_bluetooth_h4_header)+handle->snapshot;
+	handle->linktype = DLT_BLUETOOTH_HCI_H4_WITH_PHDR;
+
+	handle->read_op = bt_read_linux;
+	handle->inject_op = bt_inject_linux;
+	handle->setfilter_op = install_bpf_program; /* no kernel filtering */
+	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;
+	handlep->dev_id = dev_id;
+
+	/* Create HCI socket */
+	handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
+	if (handle->fd < 0) {
+		pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "Can't create raw socket");
+		return PCAP_ERROR;
+	}
+
+	handle->buffer = malloc(handle->bufsize);
+	if (!handle->buffer) {
+		pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "Can't allocate dump buffer");
+		goto close_fail;
+	}
+
+	opt = 1;
+	if (setsockopt(handle->fd, SOL_HCI, HCI_DATA_DIR, &opt, sizeof(opt)) < 0) {
+		pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "Can't enable data direction info");
+		goto close_fail;
+	}
+
+	opt = 1;
+	if (setsockopt(handle->fd, SOL_HCI, HCI_TIME_STAMP, &opt, sizeof(opt)) < 0) {
+		pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "Can't enable time stamp");
+		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) {
+		pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "Can't set filter");
+		goto close_fail;
+	}
+
+
+	/* Bind socket to the HCI device */
+	addr.hci_family = AF_BLUETOOTH;
+	addr.hci_dev = handlep->dev_id;
+#ifdef HAVE_STRUCT_SOCKADDR_HCI_HCI_CHANNEL
+	addr.hci_channel = HCI_CHANNEL_RAW;
+#endif
+	if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+		pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "Can't attach to device %d", handlep->dev_id);
+		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) {
+			pcap_fmt_errmsg_for_errno(handle->errbuf,
+			    errno, PCAP_ERRBUF_SIZE, "SO_RCVBUF");
+			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 _U_, pcap_handler callback, u_char *user)
+{
+	struct cmsghdr *cmsg;
+	struct msghdr msg;
+	struct iovec  iv;
+	ssize_t ret;
+	struct pcap_pkthdr pkth;
+	pcap_bluetooth_h4_header* bthdr;
+	u_char *pktd;
+	int in = 0;
+
+	pktd = (u_char *)handle->buffer + BT_CTRL_SIZE;
+	bthdr = (pcap_bluetooth_h4_header*)(void *)pktd;
+	iv.iov_base = pktd + 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 = BT_CTRL_SIZE;
+
+	/* ignore interrupt system call error */
+	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) {
+		pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "Can't receive packet");
+		return -1;
+	}
+
+	pkth.caplen = ret;
+
+	/* get direction and timestamp*/
+	cmsg = CMSG_FIRSTHDR(&msg);
+	while (cmsg) {
+		switch (cmsg->cmsg_type) {
+			case HCI_CMSG_DIR:
+				memcpy(&in, CMSG_DATA(cmsg), sizeof in);
+				break;
+                      	case HCI_CMSG_TSTAMP:
+                      		memcpy(&pkth.ts, CMSG_DATA(cmsg),
+                      		    sizeof pkth.ts);
+				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;
+	if (handle->fcode.bf_insns == NULL ||
+	    bpf_filter(handle->fcode.bf_insns, pktd, pkth.len, pkth.caplen)) {
+		callback(user, &pkth, pktd);
+		return 1;
+	}
+	return 0;	/* didn't pass filter */
+}
+
+static int
+bt_inject_linux(pcap_t *handle, const void *buf _U_, size_t size _U_)
+{
+	pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+	    "Packet injection is not supported on Bluetooth devices");
+	return (-1);
+}
+
+
+static int
+bt_stats_linux(pcap_t *handle, struct pcap_stat *stats)
+{
+	struct pcap_bt *handlep = handle->priv;
+	int ret;
+	struct hci_dev_info dev_info;
+	struct hci_dev_stats * s = &dev_info.stat;
+	dev_info.dev_id = handlep->dev_id;
+
+	/* ignore eintr */
+	do {
+		ret = ioctl(handle->fd, HCIGETDEVINFO, (void *)&dev_info);
+	} while ((ret == -1) && (errno == EINTR));
+
+	if (ret < 0) {
+		pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    errno, "Can't get stats via ioctl");
+		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_setdirection_linux(pcap_t *p, pcap_direction_t d)
+{
+	p->direction = d;
+	return 0;
+}