Author: hselasky
Date: Tue Jan 21 08:24:12 2014
New Revision: 260978
URL: http://svnweb.freebsd.org/changeset/base/260978
Log:
Add check for "hw.usb.no_pf" sysctl value.
Submitted by: Warren Block <wbl...@wonkity.com>
MFC after: 1 week
Modified:
head/usr.sbin/usbdump/usbdump.c
Modified: head/usr.sbin/usbdump/usbdump.c
==============================================================================
--- head/usr.sbin/usbdump/usbdump.c Tue Jan 21 05:56:35 2014
(r260977)
+++ head/usr.sbin/usbdump/usbdump.c Tue Jan 21 08:24:12 2014
(r260978)
@@ -34,6 +34,7 @@
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
+#include <sys/sysctl.h>
#include <sys/utsname.h>
#include <sys/queue.h>
#include <net/if.h>
@@ -780,6 +781,23 @@ usage(void)
exit(EX_USAGE);
}
+static void
+check_usb_pf_sysctl(void)
+{
+ int error;
+ int no_pf_val = 0;
+ size_t no_pf_len = sizeof(int);
+
+ /* check "hw.usb.no_pf" sysctl for 8- and 9- stable */
+
+ error = sysctlbyname("hw.usb.no_pf", &no_pf_val,
+ &no_pf_len, NULL, 0);
+ if (error == 0 && no_pf_val != 0) {
+ warnx("The USB packet filter might be disabled.");
+ warnx("See the \"hw.usb.no_pf\" sysctl for more information.");
+ }
+}
+
int
main(int argc, char *argv[])
{
@@ -872,6 +890,8 @@ main(int argc, char *argv[])
exit(EXIT_SUCCESS);
}
+ check_usb_pf_sysctl();
+
p->fd = fd = open("/dev/bpf", O_RDONLY);
if (p->fd < 0)
err(EXIT_FAILURE, "Could not open BPF device");
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