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Add check for "hw.usb.no_pf" sysctl value.

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Submitted by:	Warren Block <wblock@wonkity.com>
MFC after:	1 week
This commit is contained in:
Hans Petter Selasky 2014-01-21 08:24:12 +00:00
parent 615eca9b9d
commit 0b30fcb60d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=260978
1 changed files with 20 additions and 0 deletions
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20
usr.sbin/usbdump/usbdump.c
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@ -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");