Adds usbdump(8) tool that currently it only supports the very basic

feature set.  It's not connected to the build yet.

Reviewed by:	hps

3 files changed, 627 insertions, 0 deletions

diff --git a/usr.sbin/usbdump/Makefile b/usr.sbin/usbdump/Makefile
new file mode 100644
index 0000000..5188901
--- /dev/null
+++ b/usr.sbin/usbdump/Makefile
@@ -0,0 +1,8 @@
+# $FreeBSD$
+
+PROG=	usbdump
+SRCS=	usbdump.c
+MAN=	usbdump.8
+WARNS?=	4
+
+.include <bsd.prog.mk>
diff --git a/usr.sbin/usbdump/usbdump.8 b/usr.sbin/usbdump/usbdump.8
new file mode 100644
index 0000000..edd883a
--- /dev/null
+++ b/usr.sbin/usbdump/usbdump.8
@@ -0,0 +1,77 @@
+.\"
+.\" Copyright (c) 2010 Weongyo Jeong.
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd October 14, 2010
+.Dt usbdump 8
+.Os
+.Sh NAME
+.Nm usbdump
+.Nd "dump traffic on USB host controller"
+.Sh SYNOPSIS
+.Nm
+.Op Fl i Ar ifname
+.Op Fl r Ar file
+.Op Fl s Ar snaplen
+.Op Fl v
+.Op Fl w Ar file
+.Sh DESCRIPTION
+The
+.Nm
+utility provides a way to dump USB packets on each host controller.
+.Pp
+The following options are accepted.
+.Bl -tag -width ".Fl f Ar file"
+.It Fl i Ar ifname
+Listen on USB bus interface.
+.It Fl r Ar file
+Read the raw packets from file.
+.It Fl s Ar snaplen
+Snapshot bytes from each packet.
+.It Fl v
+Enable debugging messages.
+When it defined multiple times the verbose level increases.
+.It Fl w Ar file
+Write the raw packets to file.
+.El
+.Sh EXAMPLES
+Captures the USB raw packets alive on usbus2:
+.Pp
+.Dl "usbdump -i usbus2 -s 256 -v"
+.Pp
+Dumps the USB raw packets of usbus2 into the file without packet
+size limit:
+.Pp
+.Dl "usbdump -i usbus2 -s 0 -w /tmp/dump_pkts"
+.Pp
+Read the USB raw packets from the file:
+.Pp
+.Dl "usbdump -r /tmp/dump_pkts -v"
+.Sh SEE ALSO
+.Xr usbconfig 8
+.Sh AUTHORS
+.An Weongyo Jeong
+.Aq weongyo@FreeBSD.org .
diff --git a/usr.sbin/usbdump/usbdump.c b/usr.sbin/usbdump/usbdump.c
new file mode 100644
index 0000000..6545f1c
--- /dev/null
+++ b/usr.sbin/usbdump/usbdump.c
@@ -0,0 +1,542 @@
+/*-
+ * Copyright (c) 2010 Weongyo Jeong <weongyo@freebsd.org>
+ * 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,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
+ *    redistribution must be conditioned upon including a substantially
+ *    similar Disclaimer requirement for further binary redistribution.
+ *
+ * NO WARRANTY
+ * 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 NONINFRINGEMENT, MERCHANTIBILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/endian.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/utsname.h>
+#include <dev/usb/usb.h>
+#include <dev/usb/usb_pf.h>
+#include <dev/usb/usbdi.h>
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+struct usbcap {
+	int		fd;		/* fd for /dev/usbpf */
+	u_int		bufsize;
+	char		*buffer;
+
+	/* for -w option */
+	int		wfd;
+	/* for -r option */
+	int		rfd;
+};
+
+struct usbcap_filehdr {
+	u_int		magic;
+#define	USBCAP_FILEHDR_MAGIC	0x9a90000e
+	u_char		major;
+	u_char		minor;
+	u_char		reserved[26];
+} __packed;
+
+static int doexit = 0;
+static int pkt_captured = 0;
+static int verbose = 0;
+static const char *i_arg = "usbus0";;
+static const char *r_arg = NULL;
+static const char *w_arg = NULL;
+static const char *errstr_table[USB_ERR_MAX] = {
+	[USB_ERR_NORMAL_COMPLETION]	= "NORMAL_COMPLETION",
+	[USB_ERR_PENDING_REQUESTS]	= "PENDING_REQUESTS",
+	[USB_ERR_NOT_STARTED]		= "NOT_STARTED",
+	[USB_ERR_INVAL]			= "INVAL",
+	[USB_ERR_NOMEM]			= "NOMEM",
+	[USB_ERR_CANCELLED]		= "CANCELLED",
+	[USB_ERR_BAD_ADDRESS]		= "BAD_ADDRESS",
+	[USB_ERR_BAD_BUFSIZE]		= "BAD_BUFSIZE",
+	[USB_ERR_BAD_FLAG]		= "BAD_FLAG",
+	[USB_ERR_NO_CALLBACK]		= "NO_CALLBACK",
+	[USB_ERR_IN_USE]		= "IN_USE",
+	[USB_ERR_NO_ADDR]		= "NO_ADDR",
+	[USB_ERR_NO_PIPE]		= "NO_PIPE",
+	[USB_ERR_ZERO_NFRAMES]		= "ZERO_NFRAMES",
+	[USB_ERR_ZERO_MAXP]		= "ZERO_MAXP",
+	[USB_ERR_SET_ADDR_FAILED]	= "SET_ADDR_FAILED",
+	[USB_ERR_NO_POWER]		= "NO_POWER",
+	[USB_ERR_TOO_DEEP]		= "TOO_DEEP",
+	[USB_ERR_IOERROR]		= "IOERROR",
+	[USB_ERR_NOT_CONFIGURED]	= "NOT_CONFIGURED",
+	[USB_ERR_TIMEOUT]		= "TIMEOUT",
+	[USB_ERR_SHORT_XFER]		= "SHORT_XFER",
+	[USB_ERR_STALLED]		= "STALLED",
+	[USB_ERR_INTERRUPTED]		= "INTERRUPTED",
+	[USB_ERR_DMA_LOAD_FAILED]	= "DMA_LOAD_FAILED",
+	[USB_ERR_BAD_CONTEXT]		= "BAD_CONTEXT",
+	[USB_ERR_NO_ROOT_HUB]		= "NO_ROOT_HUB",
+	[USB_ERR_NO_INTR_THREAD]	= "NO_INTR_THREAD",
+	[USB_ERR_NOT_LOCKED]		= "NOT_LOCKED",
+};
+
+static const char *xfertype_table[] = {
+	[UE_CONTROL]			= "CTRL",
+	[UE_ISOCHRONOUS]		= "ISOC",
+	[UE_BULK]			= "BULK",
+	[UE_INTERRUPT]			= "INTR"
+};
+
+static void
+handle_sigint(int sig)
+{
+
+	(void)sig;
+	doexit = 1;
+}
+
+static void
+print_flags(u_int32_t flags)
+{
+#define	PRINTFLAGS(name)			\
+	if ((flags & USBPF_FLAG_##name) != 0)	\
+		printf("%s ", #name);
+	printf(" flags %#x", flags);
+	printf(" < ");
+	PRINTFLAGS(FORCE_SHORT_XFER);
+	PRINTFLAGS(SHORT_XFER_OK);
+	PRINTFLAGS(SHORT_FRAMES_OK);
+	PRINTFLAGS(PIPE_BOF);
+	PRINTFLAGS(PROXY_BUFFER);
+	PRINTFLAGS(EXT_BUFFER);
+	PRINTFLAGS(MANUAL_STATUS);
+	PRINTFLAGS(NO_PIPE_OK);
+	PRINTFLAGS(STALL_PIPE);
+	printf(">\n");
+#undef PRINTFLAGS
+}
+
+static void
+print_status(u_int32_t status)
+{
+#define	PRINTSTATUS(name)				\
+	if ((status & USBPF_STATUS_##name) != 0)	\
+		printf("%s ", #name);
+
+	printf(" status %#x", status);
+	printf(" < ");
+	PRINTSTATUS(OPEN);
+	PRINTSTATUS(TRANSFERRING);
+	PRINTSTATUS(DID_DMA_DELAY);
+	PRINTSTATUS(DID_CLOSE);
+	PRINTSTATUS(DRAINING);
+	PRINTSTATUS(STARTED);
+	PRINTSTATUS(BW_RECLAIMED);
+	PRINTSTATUS(CONTROL_XFR);
+	PRINTSTATUS(CONTROL_HDR);
+	PRINTSTATUS(CONTROL_ACT);
+	PRINTSTATUS(CONTROL_STALL);
+	PRINTSTATUS(SHORT_FRAMES_OK);
+	PRINTSTATUS(SHORT_XFER_OK);
+#if USB_HAVE_BUSDMA
+	PRINTSTATUS(BDMA_ENABLE);
+	PRINTSTATUS(BDMA_NO_POST_SYNC);
+	PRINTSTATUS(BDMA_SETUP);
+#endif
+	PRINTSTATUS(ISOCHRONOUS_XFR);
+	PRINTSTATUS(CURR_DMA_SET);
+	PRINTSTATUS(CAN_CANCEL_IMMED);
+	PRINTSTATUS(DOING_CALLBACK);
+	printf(">\n");
+#undef PRINTSTATUS
+}
+
+/*
+ * Display a region in traditional hexdump format.
+ */
+static void
+hexdump(const char *region, size_t len)
+{
+	const char *line;
+	int x, c;
+	char lbuf[80];
+#define EMIT(fmt, args...)	do {		\
+	sprintf(lbuf, fmt , ## args);		\
+	printf("%s", lbuf);			\
+} while (0)
+
+	for (line = region; line < (region + len); line += 16) {
+		EMIT(" %04lx  ", (long) (line - region));
+		for (x = 0; x < 16; x++) {
+			if ((line + x) < (region + len))
+				EMIT("%02x ", *(const u_int8_t *)(line + x));
+			else
+				EMIT("-- ");
+			if (x == 7)
+				EMIT(" ");
+		}
+		EMIT(" |");
+		for (x = 0; x < 16; x++) {
+			if ((line + x) < (region + len)) {
+				c = *(const u_int8_t *)(line + x);
+				/* !isprint(c) */
+				if ((c < ' ') || (c > '~'))
+					c = '.';
+				EMIT("%c", c);
+			} else
+				EMIT(" ");
+		}
+		EMIT("|\n");
+	}
+#undef EMIT
+}
+
+static void
+print_apacket(const struct usbpf_xhdr *hdr, struct usbpf_pkthdr *up,
+    const char *payload)
+{
+	struct tm *tm;
+	struct timeval tv;
+	size_t len;
+	u_int32_t framelen, x;
+	const char *ptr = payload;
+	char buf[64];
+
+	/* A packet from the kernel is based on little endian byte order. */
+	up->up_busunit = le32toh(up->up_busunit);
+	up->up_flags = le32toh(up->up_flags);
+	up->up_status = le32toh(up->up_status);
+	up->up_length = le32toh(up->up_length);
+	up->up_frames = le32toh(up->up_frames);
+	up->up_error = le32toh(up->up_error);
+	up->up_interval = le32toh(up->up_interval);
+
+	tv.tv_sec = hdr->uh_tstamp.ut_sec;
+	tv.tv_usec = hdr->uh_tstamp.ut_frac;
+	tm = localtime(&tv.tv_sec);
+
+	len = strftime(buf, sizeof(buf), "%H:%M:%S", tm);
+	printf("%.*s.%06ju", (int)len, buf, tv.tv_usec);
+	printf(" usbus%d.%d 0x%02x %s %s", up->up_busunit, up->up_address,
+	    up->up_endpoint,
+	    xfertype_table[up->up_xfertype],
+	    up->up_type == USBPF_XFERTAP_SUBMIT ? ">" : "<");
+	printf(" (%d/%d)", up->up_frames, up->up_length);
+	if (up->up_type == USBPF_XFERTAP_DONE)
+		printf(" %s", errstr_table[up->up_error]);
+	if (up->up_xfertype == UE_BULK || up->up_xfertype == UE_ISOCHRONOUS)
+		printf(" %d", up->up_interval);
+	printf("\n");
+
+	if (verbose >= 1) {
+		for (x = 0; x < up->up_frames; x++) {
+			framelen = le32toh(*((const u_int32_t *)ptr));
+			ptr += sizeof(u_int32_t);
+			printf(" frame[%u] len %d\n", x, framelen);
+			assert(framelen < (1024 * 4));
+			hexdump(ptr, framelen);
+			ptr += framelen;
+		}
+	}
+	if (verbose >= 2) {
+		print_flags(up->up_flags);
+		print_status(up->up_status);
+	}
+}
+    
+
+static void
+print_packets(char *data, const int datalen)
+{
+	struct usbpf_pkthdr *up;
+	const struct usbpf_xhdr *hdr;
+	u_int32_t framelen, x;
+	char *ptr, *next;
+
+	for (ptr = data; ptr < (data + datalen); ptr = next) {
+		hdr = (const struct usbpf_xhdr *)ptr;
+		up = (struct usbpf_pkthdr *)(ptr + hdr->uh_hdrlen);
+		next = ptr + USBPF_WORDALIGN(hdr->uh_hdrlen + hdr->uh_caplen);
+
+		ptr = ((char *)up) + sizeof(struct usbpf_pkthdr);
+		if (w_arg == NULL)
+			print_apacket(hdr, up, ptr);
+		pkt_captured++;
+		for (x = 0; x < up->up_frames; x++) {
+			framelen = le32toh(*((const u_int32_t *)ptr));
+			ptr += sizeof(u_int32_t) + framelen;
+		}
+	}
+}
+
+static void
+write_packets(struct usbcap *p, const char *data, const int datalen)
+{
+	int len = htole32(datalen), ret;
+
+	ret = write(p->wfd, &len, sizeof(int));
+	assert(ret == sizeof(int));
+	ret = write(p->wfd, data, datalen);
+	assert(ret == datalen);
+}
+
+static void
+read_file(struct usbcap *p)
+{
+	int datalen, ret;
+	char *data;
+
+	while ((ret = read(p->rfd, &datalen, sizeof(int))) == sizeof(int)) {
+		datalen = le32toh(datalen);
+		data = malloc(datalen);
+		assert(data != NULL);
+		ret = read(p->rfd, data, datalen);
+		assert(ret == datalen);
+		print_packets(data, datalen);
+		free(data);
+	}
+	if (ret == -1)
+		fprintf(stderr, "read: %s\n", strerror(errno));
+}
+
+static void
+do_loop(struct usbcap *p)
+{
+	int cc;
+
+	while (doexit == 0) {
+		cc = read(p->fd, (char *)p->buffer, p->bufsize);
+		if (cc < 0) {
+			switch (errno) {
+			case EINTR:
+				break;
+			default:
+				fprintf(stderr, "read: %s\n", strerror(errno));
+				return;
+			}
+			continue;
+		}
+		if (cc == 0)
+			continue;
+		if (w_arg != NULL)
+			write_packets(p, p->buffer, cc);
+		print_packets(p->buffer, cc);
+	}
+}
+
+static void
+init_rfile(struct usbcap *p)
+{
+	struct usbcap_filehdr uf;
+	int ret;
+
+	p->rfd = open(r_arg, O_RDONLY);
+	if (p->rfd < 0) {
+		fprintf(stderr, "open: %s (%s)\n", r_arg, strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+	ret = read(p->rfd, &uf, sizeof(uf));
+	assert(ret == sizeof(uf));
+	assert(le32toh(uf.magic) == USBCAP_FILEHDR_MAGIC);
+	assert(uf.major == 0);
+	assert(uf.minor == 1);
+}
+
+static void
+init_wfile(struct usbcap *p)
+{
+	struct usbcap_filehdr uf;
+	int ret;
+
+	p->wfd = open(w_arg, O_CREAT | O_TRUNC | O_WRONLY, S_IRUSR | S_IWUSR);
+	if (p->wfd < 0) {
+		fprintf(stderr, "open: %s (%s)\n", w_arg, strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+	bzero(&uf, sizeof(uf));
+	uf.magic = htole32(USBCAP_FILEHDR_MAGIC);
+	uf.major = 0;
+	uf.minor = 1;
+	ret = write(p->wfd, (const void *)&uf, sizeof(uf));
+	assert(ret == sizeof(uf));
+}
+
+static void
+usage(void)
+{
+
+#define FMT "    %-14s %s\n"
+	fprintf(stderr, "usage: usbdump [options]\n");
+	fprintf(stderr, FMT, "-i ifname", "Listen on USB bus interface");
+	fprintf(stderr, FMT, "-r file", "Read the raw packets from file");
+	fprintf(stderr, FMT, "-s snaplen", "Snapshot bytes from each packet");
+	fprintf(stderr, FMT, "-v", "Increases the verbose level");
+	fprintf(stderr, FMT, "-w file", "Write the raw packets to file");
+#undef FMT
+	exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct timeval tv;
+	struct usbpf_insn total_insn;
+	struct usbpf_program total_prog;
+	struct usbpf_stat us;
+	struct usbpf_version uv;
+	struct usbcap uc, *p = &uc;
+	struct usbpf_ifreq ufr;
+	long snapshot = 192;
+	u_int v;
+	int fd, o;
+	const char *optstring;
+
+	bzero(&uc, sizeof(struct usbcap));
+
+	optstring = "i:r:s:vw:";
+	while ((o = getopt(argc, argv, optstring)) != -1) {
+		switch (o) {
+		case 'i':
+			i_arg = optarg;
+			break;
+		case 'r':
+			r_arg = optarg;
+			init_rfile(p);
+			break;
+		case 's':
+			snapshot = strtol(optarg, NULL, 10);
+			errno = 0;
+			if (snapshot == 0 && errno == EINVAL)
+				usage();
+			/* snapeshot == 0 is special */
+			if (snapshot == 0)
+				snapshot = -1;
+			break;
+		case 'v':
+			verbose++;
+			break;
+		case 'w':
+			w_arg = optarg;
+			init_wfile(p);
+			break;
+		default:
+			usage();
+			/* NOTREACHED */
+		}
+	}
+
+	if (r_arg != NULL) {
+		read_file(p);
+		exit(EXIT_SUCCESS);
+	}
+
+	p->fd = fd = open("/dev/usbpf", O_RDONLY);
+	if (p->fd < 0) {
+		fprintf(stderr, "(no devices found)\n");
+		return (EXIT_FAILURE);
+	}
+
+	if (ioctl(fd, UIOCVERSION, (caddr_t)&uv) < 0) {
+		fprintf(stderr, "UIOCVERSION: %s\n", strerror(errno));
+		return (EXIT_FAILURE);
+	}
+	if (uv.uv_major != USBPF_MAJOR_VERSION ||
+	    uv.uv_minor < USBPF_MINOR_VERSION) {
+		fprintf(stderr, "kernel bpf filter out of date");
+		return (EXIT_FAILURE);
+	}
+
+	if ((ioctl(fd, UIOCGBLEN, (caddr_t)&v) < 0) || v < 65536)
+		v = 65536;
+	for ( ; v != 0; v >>= 1) {
+		(void)ioctl(fd, UIOCSBLEN, (caddr_t)&v);
+		(void)strncpy(ufr.ufr_name, i_arg, sizeof(ufr.ufr_name));
+		if (ioctl(fd, UIOCSETIF, (caddr_t)&ufr) >= 0)
+			break;
+	}
+	if (v == 0) {
+		fprintf(stderr, "UIOCSBLEN: %s: No buffer size worked", i_arg);
+		return (EXIT_FAILURE);
+	}
+
+	if (ioctl(fd, UIOCGBLEN, (caddr_t)&v) < 0) {
+		fprintf(stderr, "UIOCGBLEN: %s", strerror(errno));
+		return (EXIT_FAILURE);
+	}
+
+	p->bufsize = v;
+	p->buffer = (u_char *)malloc(p->bufsize);
+	if (p->buffer == NULL) {
+		fprintf(stderr, "malloc: %s", strerror(errno));
+		return (EXIT_FAILURE);
+	}
+
+	/* XXX no read filter rules yet so at this moment accept everything */
+	total_insn.code = (u_short)(USBPF_RET | USBPF_K);
+	total_insn.jt = 0;
+	total_insn.jf = 0;
+	total_insn.k = snapshot;
+
+	total_prog.uf_len = 1;
+	total_prog.uf_insns = &total_insn;
+	if (ioctl(p->fd, UIOCSETF, (caddr_t)&total_prog) < 0) {
+		fprintf(stderr, "UIOCSETF: %s", strerror(errno));
+		return (EXIT_FAILURE);
+	}
+
+	/* 1 second read timeout */
+	tv.tv_sec = 1;
+	tv.tv_usec = 0;
+	if (ioctl(p->fd, UIOCSRTIMEOUT, (caddr_t)&tv) < 0) {
+		fprintf(stderr, "UIOCSRTIMEOUT: %s", strerror(errno));
+		return (EXIT_FAILURE);
+	}
+
+	(void)signal(SIGINT, handle_sigint);
+
+	do_loop(p);
+
+	if (ioctl(fd, UIOCGSTATS, (caddr_t)&us) < 0) {
+		fprintf(stderr, "UIOCGSTATS: %s", strerror(errno));
+		return (EXIT_FAILURE);
+	}
+
+	/* XXX what's difference between pkt_captured and us.us_recv? */
+	printf("\n");
+	printf("%d packets captured\n", pkt_captured);
+	printf("%d packets received by filter\n", us.us_recv);
+	printf("%d packets dropped by kernel\n", us.us_drop);
+
+	if (p->fd > 0)
+		close(p->fd);
+	if (p->rfd > 0)
+		close(p->rfd);
+	if (p->wfd > 0)
+		close(p->wfd);
+
+	return (EXIT_SUCCESS);
+}