X-Git-Url: https://git.tcpdump.org/libpcap/blobdiff_plain/266b20f3d4bc6ae55ea9742eadb8fbe40c6b7750..cc3ca65d6519faf3a0e4609b5150757c14af36e9:/pcap-bt-linux.c

diff --git a/pcap-bt-linux.c b/pcap-bt-linux.c
index f54fc48f..4452fe44 100644
--- a/pcap-bt-linux.c
+++ b/pcap-bt-linux.c
@@ -11,9 +11,8 @@
  * 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. Neither the name of the Politecnico di Torino, CACE Technologies 
- * nor the names of its contributors may be used to endorse or promote 
- * products derived from this software without specific prior written 
+ * 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
@@ -32,17 +31,14 @@
  * By Paolo Abeni <paolo.abeni@email.it>
  *
  */
-#ifndef lint
-static const char rcsid[] _U_ =
-    "@(#) $Header: /tcpdump/master/libpcap/pcap-bt-linux.c,v 1.8 2007-08-18 20:54:52 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"
@@ -55,6 +51,7 @@ static const char rcsid[] _U_ =
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
+#include <arpa/inet.h>
 
 #include <bluetooth/bluetooth.h>
 #include <bluetooth/hci.h>
@@ -63,37 +60,42 @@ static const char rcsid[] _U_ =
 #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 *);
-static void bt_close_linux(pcap_t *);
 
-int 
-bt_platform_finddevs(pcap_if_t **alldevsp, char *err_str)
+/*
+ * 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_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 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));
+		pcap_snprintf(err_str, PCAP_ERRBUF_SIZE,
+		    "Can't open raw Bluetooth socket: %s", strerror(errno));
 		return -1;
 	}
 
 	dev_list = malloc(HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list));
-	if (!dev_list) 
+	if (!dev_list)
 	{
-		snprintf(err_str, PCAP_ERRBUF_SIZE, "Can't allocate %d bytes for Bluetooth device 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;
@@ -101,10 +103,11 @@ bt_platform_finddevs(pcap_if_t **alldevsp, char *err_str)
 
 	dev_list->dev_num = HCI_MAX_DEV;
 
-	if (ioctl(sock, HCIGETDEVLIST, (void *) dev_list) < 0) 
+	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));
+		pcap_snprintf(err_str, PCAP_ERRBUF_SIZE,
+		    "Can't get Bluetooth device list via ioctl: %s",
+		    strerror(errno));
 		ret = -1;
 		goto free;
 	}
@@ -112,11 +115,11 @@ bt_platform_finddevs(pcap_if_t **alldevsp, char *err_str)
 	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, 
+
+		pcap_snprintf(dev_name, 20, BT_IFACE"%d", dev_req->dev_id);
+		pcap_snprintf(dev_descr, 30, "Bluetooth adapter number %d", i);
+
+		if (pcap_add_if(alldevsp, dev_name, 0,
 		       dev_descr, err_str) < 0)
 		{
 			ret = -1;
@@ -133,108 +136,163 @@ done:
 	return ret;
 }
 
-pcap_t*
-bt_open_live(const char* bus, int snaplen, int promisc , int to_ms, char* errmsg)
+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;
-	pcap_t		*handle;
 	int		dev_id;
 	struct hci_filter	flt;
-	    
+	int err = PCAP_ERROR;
+
 	/* get bt interface id */
-	if (sscanf(bus, BT_IFACE"%d", &dev_id) != 1)
+	if (sscanf(handle->opt.device, BT_IFACE"%d", &dev_id) != 1)
 	{
-	    	snprintf(errmsg, PCAP_ERRBUF_SIZE,
-			"Can't get Bluetooth bus index from %s", bus);
-		return NULL;
-	}
-	
-	/* Allocate a handle for this session. */
-	handle = malloc(sizeof(*handle));
-	if (handle == NULL) {
-		snprintf(errmsg, PCAP_ERRBUF_SIZE, "malloc: %s",
-			pcap_strerror(errno));
-		return NULL;
+		pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+			"Can't get Bluetooth device index from %s",
+			 handle->opt.device);
+		return PCAP_ERROR;
 	}
-	
+
 	/* Initialize some components of the pcap structure. */
-	memset(handle, 0, sizeof(*handle));
-	handle->snapshot	= snaplen;
-	handle->md.timeout	= to_ms;
-	handle->bufsize = snaplen+BT_CTRL_SIZE;
-	handle->offset = BT_CTRL_SIZE;
-	handle->linktype = DLT_BLUETOOTH_HCI_H4;
-	
+	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 = bt_setfilter_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;
-	handle->close_op = bt_close_linux;
-	handle->md.ifindex = dev_id;
-	
+	handlep->dev_id = dev_id;
+
 	/* Create HCI socket */
 	handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
 	if (handle->fd < 0) {
-		snprintf(errmsg, PCAP_ERRBUF_SIZE, "Can't create raw socket %d:%s",
-			errno, strerror(errno));
-		free(handle);
-		return NULL;
+		pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    "Can't create raw socket: %s", strerror(errno));
+		return PCAP_ERROR;
 	}
 
-	handle->buffer = malloc(snaplen+BT_CTRL_SIZE);
+	handle->buffer = malloc(handle->bufsize);
 	if (!handle->buffer) {
-		snprintf(errmsg, PCAP_ERRBUF_SIZE, "Can't allocate dump buffer: %s",
+		pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate dump buffer: %s",
 			pcap_strerror(errno));
-		pcap_close(handle);
-		return NULL;
+		goto close_fail;
 	}
 
 	opt = 1;
 	if (setsockopt(handle->fd, SOL_HCI, HCI_DATA_DIR, &opt, sizeof(opt)) < 0) {
-		snprintf(errmsg, PCAP_ERRBUF_SIZE, "Can't enable data direction info %d:%s",
-			errno, strerror(errno));
-		pcap_close(handle);
-		return NULL;
+		pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    "Can't enable data direction info: %s", strerror(errno));
+		goto close_fail;
 	}
 
 	opt = 1;
 	if (setsockopt(handle->fd, SOL_HCI, HCI_TIME_STAMP, &opt, sizeof(opt)) < 0) {
-		snprintf(errmsg, PCAP_ERRBUF_SIZE, "Can't enable time stamp %d:%s",
-			errno, strerror(errno));
-		pcap_close(handle);
-		return NULL;
+		pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    "Can't enable time stamp: %s", strerror(errno));
+		goto close_fail;
 	}
-	
-	/* Setup filter, do not call hci function to avoid dependence on 
+
+	/* 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.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(errmsg, PCAP_ERRBUF_SIZE, "Can't set filter %d:%s",
-			errno, strerror(errno));
-		pcap_close(handle);
-		return NULL;
+		pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    "Can't set filter: %s", strerror(errno));
+		goto close_fail;
 	}
 
 
 	/* Bind socket to the HCI device */
 	addr.hci_family = AF_BLUETOOTH;
-	addr.hci_dev = handle->md.ifindex;
+	addr.hci_dev = handlep->dev_id;
+#ifdef SOCKADDR_HCI_HAS_HCI_CHANNEL
+	addr.hci_channel = HCI_CHANNEL_RAW;
+#endif
 	if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
-		snprintf(errmsg, PCAP_ERRBUF_SIZE, "Can't attach to device %d %d:%s",
-			handle->md.ifindex, errno, strerror(errno));
-		pcap_close(handle);
-		return NULL;
+		pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    "Can't attach to device %d: %s", handlep->dev_id,
+		    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) {
+			pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+				 "SO_RCVBUF: %s", pcap_strerror(errno));
+			goto close_fail;
+		}
 	}
-	handle->selectable_fd = handle->fd;	
-	
-	return handle;	
+
+	handle->selectable_fd = handle->fd;
+	return 0;
+
+close_fail:
+	pcap_cleanup_live_common(handle);
+	return err;
 }
 
 static int
@@ -243,106 +301,109 @@ bt_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *us
 	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;
 
-	iv.iov_base = &handle->buffer[handle->offset];
+	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 = handle->offset;
+	msg.msg_controllen = BT_CTRL_SIZE;
 
 	/* ignore interrupt system call error */
 	do {
-		pkth.caplen = recvmsg(handle->fd, &msg, 0);
+		ret = recvmsg(handle->fd, &msg, 0);
 		if (handle->break_loop)
 		{
 			handle->break_loop = 0;
 			return -2;
 		}
-	} while ((pkth.caplen == -1) && (errno == EINTR));
+	} while ((ret == -1) && (errno == EINTR));
 
-		
-	if (pkth.caplen < 0) {
-		snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't receive packet %d:%s",
-			errno, strerror(errno));
+	if (ret < 0) {
+		pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    "Can't receive packet: %s", strerror(errno));
 		return -1;
 	}
 
-	/* get direction and timestamp*/ 
+	pkth.caplen = ret;
+
+	/* get direction and timestamp*/
 	cmsg = CMSG_FIRSTHDR(&msg);
 	while (cmsg) {
-		int in;
 		switch (cmsg->cmsg_type) {
 			case HCI_CMSG_DIR:
-				in = *((int *) CMSG_DATA(cmsg));
+				memcpy(&in, CMSG_DATA(cmsg), sizeof in);
 				break;
                       	case HCI_CMSG_TSTAMP:
-				pkth.ts = *((struct timeval *) CMSG_DATA(cmsg));
+                      		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;
-	callback(user, &pkth, iv.iov_base);
-	return 1;
+	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, size_t size)
 {
-	snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on "
+	pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on "
     		"bluetooth devices");
 	return (-1);
-}                           
-
-
-static void
-bt_close_linux(pcap_t* handle)
-{
-	close(handle->fd);
-	free(handle->buffer);
 }
 
 
-static int 
+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 = handle->md.ifindex;
-	
-	/* ingnore eintr */
+	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) {
-		snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "can get stats"
-			" via ioctl %d:%s", errno, strerror(errno));
+		pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+		    "Can't get stats via ioctl: %s", 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 + 
+	/* 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 
+static int
 bt_setdirection_linux(pcap_t *p, pcap_direction_t d)
 {
 	p->direction = d;