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sysctl: Add flags to filter jail prison and vnet variables

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So users do not have to contact the source code to tell whether a
variable is a jail prison / vnet one or not.

Reviewed by:	cy (previous version), markj, jamie (for #jails)
MFC after:	2 weeks
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D47107
This commit is contained in:
Zhenlei Huang 2024-10-29 19:26:11 +08:00
parent d652801574
commit 5ec83c660a
2 changed files with 23 additions and 4 deletions
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9
sbin/sysctl/sysctl.8
View File

@ -28,7 +28,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd August 18, 2023
.Dd October 29, 2024
.Dt SYSCTL 8
.Os
.Sh NAME
@ -111,6 +111,8 @@ The purpose is to make use of
.Nm
for collecting data from a variety of machines (not all of which
are necessarily running exactly the same software) easier.
.It Fl J
Display only jail prision sysctl variables (CTLFLAG_PRISON).
.It Fl l
Show the length of variables along with their values.
This option cannot be combined with the
@ -153,6 +155,8 @@ to standard error.
Display only variables that are settable via loader (CTLFLAG_TUN).
.It Fl t
Print the type of the variable.
.It Fl V
Display only VNET sysctl variables (CTLFLAG_VNET).
.It Fl W
Display only writable variables that are not statistical.
Useful for determining the set of runtime tunable sysctls.
@ -325,7 +329,8 @@ option has been deprecated and is silently ignored.
.Xr loader.conf 5 ,
.Xr sysctl.conf 5 ,
.Xr security 7 ,
.Xr loader 8
.Xr loader 8 ,
.Xr jail 8
.Sh HISTORY
A
.Nm

18
sbin/sysctl/sysctl.c
View File

@ -63,7 +63,7 @@ static const char *conffile;
static int aflag, bflag, Bflag, dflag, eflag, hflag, iflag;
static int Nflag, nflag, oflag, qflag, tflag, Tflag, Wflag, xflag;
static bool Fflag, lflag;
static bool Fflag, Jflag, lflag, Vflag;
static int oidfmt(int *, int, char *, u_int *);
static int parsefile(const char *);
@ -136,7 +136,7 @@ main(int argc, char **argv)
setbuf(stdout,0);
setbuf(stderr,0);
while ((ch = getopt(argc, argv, "AabB:def:FhilNnoqtTwWxX")) != -1) {
while ((ch = getopt(argc, argv, "AabB:def:FhiJlNnoqtTVwWxX")) != -1) {
switch (ch) {
case 'A':
/* compatibility */
@ -169,6 +169,9 @@ main(int argc, char **argv)
case 'i':
iflag = 1;
break;
case 'J':
Jflag = true;
break;
case 'l':
lflag = true;
break;
@ -190,6 +193,9 @@ main(int argc, char **argv)
case 'T':
Tflag = 1;
break;
case 'V':
Vflag = true;
break;
case 'w':
/* compatibility */
/* ignored */
@ -1048,10 +1054,18 @@ show_var(int *oid, int nlen, bool honor_skip)
if (Wflag && ((kind & CTLFLAG_WR) == 0 || (kind & CTLFLAG_STATS) != 0))
return (1);
/* if Jflag then only list sysctls that are prison variables. */
if (Jflag && (kind & CTLFLAG_PRISON) == 0)
return (1);
/* if Tflag then only list sysctls that are tuneables. */
if (Tflag && (kind & CTLFLAG_TUN) == 0)
return (1);
/* if Vflag then only list sysctls that are vnet variables. */
if (Vflag && (kind & CTLFLAG_VNET) == 0)
return (1);
if (Nflag) {
printf("%s", name);
return (0);