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freebsd-nq/sbin/sysctl/sysctl.c
Vladimir Kondratyev f99e7b1aed evdev: export event device properties through sysctl interface 
A big security advantage of Wayland is not allowing applications to read
input devices all the time. Having /dev/input/* accessible to the user
account subverts this advantage.

libudev-devd was opening the evdev devices to detect their types (mouse,
keyboard, touchpad, etc). This don't work if /dev/input/* is inaccessible.
With the kernel exposing this information as sysctls (kern.evdev.input.*),
we can work w/o /dev/input/* access, preserving the Wayland security model.

Submitted by:		Greg V <greg@unrelenting.technology>
Reviewed by:		wulf, imp
MFC after:		2 weeks
Differential Revision:	https://reviews.freebsd.org/D18694
2019-02-24 18:47:04 +00:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1993
* The Regents of the University of California. 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)from: sysctl.c 8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/vmmeter.h>
#include <dev/evdev/input.h>
#ifdef __amd64__
#include <sys/efi.h>
#include <machine/metadata.h>
#endif
#if defined(__amd64__) || defined(__i386__)
#include <machine/pc/bios.h>
#endif
#include <assert.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <inttypes.h>
#include <locale.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
static const char *conffile;
static int aflag, bflag, Bflag, dflag, eflag, hflag, iflag;
static int Nflag, nflag, oflag, qflag, tflag, Tflag, Wflag, xflag;
static int oidfmt(int *, int, char *, u_int *);
static int parsefile(const char *);
static int parse(const char *, int);
static int show_var(int *, int);
static int sysctl_all(int *oid, int len);
static int name2oid(const char *, int *);
static int strIKtoi(const char *, char **, const char *);
static int ctl_sign[CTLTYPE+1] = {
[CTLTYPE_INT] = 1,
[CTLTYPE_LONG] = 1,
[CTLTYPE_S8] = 1,
[CTLTYPE_S16] = 1,
[CTLTYPE_S32] = 1,
[CTLTYPE_S64] = 1,
};
static int ctl_size[CTLTYPE+1] = {
[CTLTYPE_INT] = sizeof(int),
[CTLTYPE_UINT] = sizeof(u_int),
[CTLTYPE_LONG] = sizeof(long),
[CTLTYPE_ULONG] = sizeof(u_long),
[CTLTYPE_S8] = sizeof(int8_t),
[CTLTYPE_S16] = sizeof(int16_t),
[CTLTYPE_S32] = sizeof(int32_t),
[CTLTYPE_S64] = sizeof(int64_t),
[CTLTYPE_U8] = sizeof(uint8_t),
[CTLTYPE_U16] = sizeof(uint16_t),
[CTLTYPE_U32] = sizeof(uint32_t),
[CTLTYPE_U64] = sizeof(uint64_t),
};
static const char *ctl_typename[CTLTYPE+1] = {
[CTLTYPE_INT] = "integer",
[CTLTYPE_UINT] = "unsigned integer",
[CTLTYPE_LONG] = "long integer",
[CTLTYPE_ULONG] = "unsigned long",
[CTLTYPE_U8] = "uint8_t",
[CTLTYPE_U16] = "uint16_t",
[CTLTYPE_U32] = "uint32_t",
[CTLTYPE_U64] = "uint64_t",
[CTLTYPE_S8] = "int8_t",
[CTLTYPE_S16] = "int16_t",
[CTLTYPE_S32] = "int32_t",
[CTLTYPE_S64] = "int64_t",
[CTLTYPE_NODE] = "node",
[CTLTYPE_STRING] = "string",
[CTLTYPE_OPAQUE] = "opaque",
};
static void
usage(void)
{
(void)fprintf(stderr, "%s\n%s\n",
"usage: sysctl [-bdehiNnoqTtWx] [ -B <bufsize> ] [-f filename] name[=value] ...",
" sysctl [-bdehNnoqTtWx] [ -B <bufsize> ] -a");
exit(1);
}
int
main(int argc, char **argv)
{
int ch;
int warncount = 0;
setlocale(LC_NUMERIC, "");
setbuf(stdout,0);
setbuf(stderr,0);
while ((ch = getopt(argc, argv, "AabB:def:hiNnoqtTwWxX")) != -1) {
switch (ch) {
case 'A':
/* compatibility */
aflag = oflag = 1;
break;
case 'a':
aflag = 1;
break;
case 'b':
bflag = 1;
break;
case 'B':
Bflag = strtol(optarg, NULL, 0);
break;
case 'd':
dflag = 1;
break;
case 'e':
eflag = 1;
break;
case 'f':
conffile = optarg;
break;
case 'h':
hflag = 1;
break;
case 'i':
iflag = 1;
break;
case 'N':
Nflag = 1;
break;
case 'n':
nflag = 1;
break;
case 'o':
oflag = 1;
break;
case 'q':
qflag = 1;
break;
case 't':
tflag = 1;
break;
case 'T':
Tflag = 1;
break;
case 'w':
/* compatibility */
/* ignored */
break;
case 'W':
Wflag = 1;
break;
case 'X':
/* compatibility */
aflag = xflag = 1;
break;
case 'x':
xflag = 1;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (Nflag && nflag)
usage();
if (aflag && argc == 0)
exit(sysctl_all(0, 0));
if (argc == 0 && conffile == NULL)
usage();
warncount = 0;
if (conffile != NULL)
warncount += parsefile(conffile);
while (argc-- > 0)
warncount += parse(*argv++, 0);
return (warncount);
}
/*
* Parse a single numeric value, append it to 'newbuf', and update
* 'newsize'. Returns true if the value was parsed and false if the
* value was invalid. Non-numeric types (strings) are handled
* directly in parse().
*/
static bool
parse_numeric(const char *newvalstr, const char *fmt, u_int kind,
void **newbufp, size_t *newsizep)
{
void *newbuf;
const void *newval;
int8_t i8val;
uint8_t u8val;
int16_t i16val;
uint16_t u16val;
int32_t i32val;
uint32_t u32val;
int intval;
unsigned int uintval;
long longval;
unsigned long ulongval;
int64_t i64val;
uint64_t u64val;
size_t valsize;
char *endptr = NULL;
errno = 0;
switch (kind & CTLTYPE) {
case CTLTYPE_INT:
if (strncmp(fmt, "IK", 2) == 0)
intval = strIKtoi(newvalstr, &endptr, fmt);
else
intval = (int)strtol(newvalstr, &endptr, 0);
newval = &intval;
valsize = sizeof(intval);
break;
case CTLTYPE_UINT:
uintval = (int) strtoul(newvalstr, &endptr, 0);
newval = &uintval;
valsize = sizeof(uintval);
break;
case CTLTYPE_LONG:
longval = strtol(newvalstr, &endptr, 0);
newval = &longval;
valsize = sizeof(longval);
break;
case CTLTYPE_ULONG:
ulongval = strtoul(newvalstr, &endptr, 0);
newval = &ulongval;
valsize = sizeof(ulongval);
break;
case CTLTYPE_S8:
i8val = (int8_t)strtol(newvalstr, &endptr, 0);
newval = &i8val;
valsize = sizeof(i8val);
break;
case CTLTYPE_S16:
i16val = (int16_t)strtol(newvalstr, &endptr, 0);
newval = &i16val;
valsize = sizeof(i16val);
break;
case CTLTYPE_S32:
i32val = (int32_t)strtol(newvalstr, &endptr, 0);
newval = &i32val;
valsize = sizeof(i32val);
break;
case CTLTYPE_S64:
i64val = strtoimax(newvalstr, &endptr, 0);
newval = &i64val;
valsize = sizeof(i64val);
break;
case CTLTYPE_U8:
u8val = (uint8_t)strtoul(newvalstr, &endptr, 0);
newval = &u8val;
valsize = sizeof(u8val);
break;
case CTLTYPE_U16:
u16val = (uint16_t)strtoul(newvalstr, &endptr, 0);
newval = &u16val;
valsize = sizeof(u16val);
break;
case CTLTYPE_U32:
u32val = (uint32_t)strtoul(newvalstr, &endptr, 0);
newval = &u32val;
valsize = sizeof(u32val);
break;
case CTLTYPE_U64:
u64val = strtoumax(newvalstr, &endptr, 0);
newval = &u64val;
valsize = sizeof(u64val);
break;
default:
/* NOTREACHED */
abort();
}
if (errno != 0 || endptr == newvalstr ||
(endptr != NULL && *endptr != '\0'))
return (false);
newbuf = realloc(*newbufp, *newsizep + valsize);
if (newbuf == NULL)
err(1, "out of memory");
memcpy((char *)newbuf + *newsizep, newval, valsize);
*newbufp = newbuf;
*newsizep += valsize;
return (true);
}
/*
* Parse a name into a MIB entry.
* Lookup and print out the MIB entry if it exists.
* Set a new value if requested.
*/
static int
parse(const char *string, int lineno)
{
int len, i, j;
const void *newval;
char *newvalstr = NULL;
void *newbuf;
size_t newsize = Bflag;
int mib[CTL_MAXNAME];
char *cp, *bufp, buf[BUFSIZ], fmt[BUFSIZ], line[BUFSIZ];
u_int kind;
if (lineno)
snprintf(line, sizeof(line), " at line %d", lineno);
else
line[0] = '\0';
cp = buf;
if (snprintf(buf, BUFSIZ, "%s", string) >= BUFSIZ) {
warnx("oid too long: '%s'%s", string, line);
return (1);
}
bufp = strsep(&cp, "=:");
if (cp != NULL) {
/* Tflag just lists tunables, do not allow assignment */
if (Tflag || Wflag) {
warnx("Can't set variables when using -T or -W");
usage();
}
while (isspace(*cp))
cp++;
/* Strip a pair of " or ' if any. */
switch (*cp) {
case '\"':
case '\'':
if (cp[strlen(cp) - 1] == *cp)
cp[strlen(cp) - 1] = '\0';
cp++;
}
newvalstr = cp;
newsize = strlen(cp);
}
/* Trim spaces */
cp = bufp + strlen(bufp) - 1;
while (cp >= bufp && isspace((int)*cp)) {
*cp = '\0';
cp--;
}
len = name2oid(bufp, mib);
if (len < 0) {
if (iflag)
return (0);
if (qflag)
return (1);
else {
if (errno == ENOENT) {
warnx("unknown oid '%s'%s", bufp, line);
} else {
warn("unknown oid '%s'%s", bufp, line);
}
return (1);
}
}
if (oidfmt(mib, len, fmt, &kind)) {
warn("couldn't find format of oid '%s'%s", bufp, line);
if (iflag)
return (1);
else
exit(1);
}
if (newvalstr == NULL || dflag) {
if ((kind & CTLTYPE) == CTLTYPE_NODE) {
if (dflag) {
i = show_var(mib, len);
if (!i && !bflag)
putchar('\n');
}
sysctl_all(mib, len);
} else {
i = show_var(mib, len);
if (!i && !bflag)
putchar('\n');
}
} else {
if ((kind & CTLTYPE) == CTLTYPE_NODE) {
warnx("oid '%s' isn't a leaf node%s", bufp, line);
return (1);
}
if (!(kind & CTLFLAG_WR)) {
if (kind & CTLFLAG_TUN) {
warnx("oid '%s' is a read only tunable%s", bufp, line);
warnx("Tunable values are set in /boot/loader.conf");
} else
warnx("oid '%s' is read only%s", bufp, line);
return (1);
}
switch (kind & CTLTYPE) {
case CTLTYPE_INT:
case CTLTYPE_UINT:
case CTLTYPE_LONG:
case CTLTYPE_ULONG:
case CTLTYPE_S8:
case CTLTYPE_S16:
case CTLTYPE_S32:
case CTLTYPE_S64:
case CTLTYPE_U8:
case CTLTYPE_U16:
case CTLTYPE_U32:
case CTLTYPE_U64:
if (strlen(newvalstr) == 0) {
warnx("empty numeric value");
return (1);
}
/* FALLTHROUGH */
case CTLTYPE_STRING:
break;
default:
warnx("oid '%s' is type %d,"
" cannot set that%s", bufp,
kind & CTLTYPE, line);
return (1);
}
newbuf = NULL;
switch (kind & CTLTYPE) {
case CTLTYPE_STRING:
newval = newvalstr;
break;
default:
newsize = 0;
while ((cp = strsep(&newvalstr, " ,")) != NULL) {
if (*cp == '\0')
continue;
if (!parse_numeric(cp, fmt, kind, &newbuf,
&newsize)) {
warnx("invalid %s '%s'%s",
ctl_typename[kind & CTLTYPE],
cp, line);
free(newbuf);
return (1);
}
}
newval = newbuf;
break;
}
i = show_var(mib, len);
if (sysctl(mib, len, 0, 0, newval, newsize) == -1) {
free(newbuf);
if (!i && !bflag)
putchar('\n');
switch (errno) {
case EOPNOTSUPP:
warnx("%s: value is not available%s",
string, line);
return (1);
case ENOTDIR:
warnx("%s: specification is incomplete%s",
string, line);
return (1);
case ENOMEM:
warnx("%s: type is unknown to this program%s",
string, line);
return (1);
default:
warn("%s%s", string, line);
return (1);
}
}
free(newbuf);
if (!bflag)
printf(" -> ");
i = nflag;
nflag = 1;
j = show_var(mib, len);
if (!j && !bflag)
putchar('\n');
nflag = i;
}
return (0);
}
static int
parsefile(const char *filename)
{
FILE *file;
char line[BUFSIZ], *p, *pq, *pdq;
int warncount = 0, lineno = 0;
file = fopen(filename, "r");
if (file == NULL)
err(EX_NOINPUT, "%s", filename);
while (fgets(line, sizeof(line), file) != NULL) {
lineno++;
p = line;
pq = strchr(line, '\'');
pdq = strchr(line, '\"');
/* Replace the first # with \0. */
while((p = strchr(p, '#')) != NULL) {
if (pq != NULL && p > pq) {
if ((p = strchr(pq+1, '\'')) != NULL)
*(++p) = '\0';
break;
} else if (pdq != NULL && p > pdq) {
if ((p = strchr(pdq+1, '\"')) != NULL)
*(++p) = '\0';
break;
} else if (p == line || *(p-1) != '\\') {
*p = '\0';
break;
}
p++;
}
/* Trim spaces */
p = line + strlen(line) - 1;
while (p >= line && isspace((int)*p)) {
*p = '\0';
p--;
}
p = line;
while (isspace((int)*p))
p++;
if (*p == '\0')
continue;
else
warncount += parse(p, lineno);
}
fclose(file);
return (warncount);
}
/* These functions will dump out various interesting structures. */
static int
S_clockinfo(size_t l2, void *p)
{
struct clockinfo *ci = (struct clockinfo*)p;
if (l2 != sizeof(*ci)) {
warnx("S_clockinfo %zu != %zu", l2, sizeof(*ci));
return (1);
}
printf(hflag ? "{ hz = %'d, tick = %'d, profhz = %'d, stathz = %'d }" :
"{ hz = %d, tick = %d, profhz = %d, stathz = %d }",
ci->hz, ci->tick, ci->profhz, ci->stathz);
return (0);
}
static int
S_loadavg(size_t l2, void *p)
{
struct loadavg *tv = (struct loadavg*)p;
if (l2 != sizeof(*tv)) {
warnx("S_loadavg %zu != %zu", l2, sizeof(*tv));
return (1);
}
printf(hflag ? "{ %'.2f %'.2f %'.2f }" : "{ %.2f %.2f %.2f }",
(double)tv->ldavg[0]/(double)tv->fscale,
(double)tv->ldavg[1]/(double)tv->fscale,
(double)tv->ldavg[2]/(double)tv->fscale);
return (0);
}
static int
S_timeval(size_t l2, void *p)
{
struct timeval *tv = (struct timeval*)p;
time_t tv_sec;
char *p1, *p2;
if (l2 != sizeof(*tv)) {
warnx("S_timeval %zu != %zu", l2, sizeof(*tv));
return (1);
}
printf(hflag ? "{ sec = %'jd, usec = %'ld } " :
"{ sec = %jd, usec = %ld } ",
(intmax_t)tv->tv_sec, tv->tv_usec);
tv_sec = tv->tv_sec;
p1 = strdup(ctime(&tv_sec));
for (p2=p1; *p2 ; p2++)
if (*p2 == '\n')
*p2 = '\0';
fputs(p1, stdout);
free(p1);
return (0);
}
static int
S_vmtotal(size_t l2, void *p)
{
struct vmtotal *v;
int pageKilo;
if (l2 != sizeof(*v)) {
warnx("S_vmtotal %zu != %zu", l2, sizeof(*v));
return (1);
}
v = p;
pageKilo = getpagesize() / 1024;
#define pg2k(a) ((uintmax_t)(a) * pageKilo)
printf("\nSystem wide totals computed every five seconds:"
" (values in kilobytes)\n");
printf("===============================================\n");
printf("Processes:\t\t(RUNQ: %d Disk Wait: %d Page Wait: "
"%d Sleep: %d)\n",
v->t_rq, v->t_dw, v->t_pw, v->t_sl);
printf("Virtual Memory:\t\t(Total: %juK Active: %juK)\n",
pg2k(v->t_vm), pg2k(v->t_avm));
printf("Real Memory:\t\t(Total: %juK Active: %juK)\n",
pg2k(v->t_rm), pg2k(v->t_arm));
printf("Shared Virtual Memory:\t(Total: %juK Active: %juK)\n",
pg2k(v->t_vmshr), pg2k(v->t_avmshr));
printf("Shared Real Memory:\t(Total: %juK Active: %juK)\n",
pg2k(v->t_rmshr), pg2k(v->t_armshr));
printf("Free Memory:\t%juK", pg2k(v->t_free));
return (0);
}
static int
S_input_id(size_t l2, void *p)
{
struct input_id *id = p;
if (l2 != sizeof(*id)) {
warnx("S_input_id %zu != %zu", l2, sizeof(*id));
return (1);
}
printf("{ bustype = 0x%04x, vendor = 0x%04x, "
"product = 0x%04x, version = 0x%04x }",
id->bustype, id->vendor, id->product, id->version);
return (0);
}
#ifdef __amd64__
static int
S_efi_map(size_t l2, void *p)
{
struct efi_map_header *efihdr;
struct efi_md *map;
const char *type;
size_t efisz;
int ndesc, i;
static const char * const types[] = {
[EFI_MD_TYPE_NULL] = "Reserved",
[EFI_MD_TYPE_CODE] = "LoaderCode",
[EFI_MD_TYPE_DATA] = "LoaderData",
[EFI_MD_TYPE_BS_CODE] = "BootServicesCode",
[EFI_MD_TYPE_BS_DATA] = "BootServicesData",
[EFI_MD_TYPE_RT_CODE] = "RuntimeServicesCode",
[EFI_MD_TYPE_RT_DATA] = "RuntimeServicesData",
[EFI_MD_TYPE_FREE] = "ConventionalMemory",
[EFI_MD_TYPE_BAD] = "UnusableMemory",
[EFI_MD_TYPE_RECLAIM] = "ACPIReclaimMemory",
[EFI_MD_TYPE_FIRMWARE] = "ACPIMemoryNVS",
[EFI_MD_TYPE_IOMEM] = "MemoryMappedIO",
[EFI_MD_TYPE_IOPORT] = "MemoryMappedIOPortSpace",
[EFI_MD_TYPE_PALCODE] = "PalCode",
[EFI_MD_TYPE_PERSISTENT] = "PersistentMemory",
};
/*
* Memory map data provided by UEFI via the GetMemoryMap
* Boot Services API.
*/
if (l2 < sizeof(*efihdr)) {
warnx("S_efi_map length less than header");
return (1);
}
efihdr = p;
efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf;
map = (struct efi_md *)((uint8_t *)efihdr + efisz);
if (efihdr->descriptor_size == 0)
return (0);
if (l2 != efisz + efihdr->memory_size) {
warnx("S_efi_map length mismatch %zu vs %zu", l2, efisz +
efihdr->memory_size);
return (1);
}
ndesc = efihdr->memory_size / efihdr->descriptor_size;
printf("\n%23s %12s %12s %8s %4s",
"Type", "Physical", "Virtual", "#Pages", "Attr");
for (i = 0; i < ndesc; i++,
map = efi_next_descriptor(map, efihdr->descriptor_size)) {
type = NULL;
if (map->md_type < nitems(types))
type = types[map->md_type];
if (type == NULL)
type = "<INVALID>";
printf("\n%23s %012jx %12p %08jx ", type,
(uintmax_t)map->md_phys, map->md_virt,
(uintmax_t)map->md_pages);
if (map->md_attr & EFI_MD_ATTR_UC)
printf("UC ");
if (map->md_attr & EFI_MD_ATTR_WC)
printf("WC ");
if (map->md_attr & EFI_MD_ATTR_WT)
printf("WT ");
if (map->md_attr & EFI_MD_ATTR_WB)
printf("WB ");
if (map->md_attr & EFI_MD_ATTR_UCE)
printf("UCE ");
if (map->md_attr & EFI_MD_ATTR_WP)
printf("WP ");
if (map->md_attr & EFI_MD_ATTR_RP)
printf("RP ");
if (map->md_attr & EFI_MD_ATTR_XP)
printf("XP ");
if (map->md_attr & EFI_MD_ATTR_RT)
printf("RUNTIME");
}
return (0);
}
#endif
#if defined(__amd64__) || defined(__i386__)
static int
S_bios_smap_xattr(size_t l2, void *p)
{
struct bios_smap_xattr *smap, *end;
if (l2 % sizeof(*smap) != 0) {
warnx("S_bios_smap_xattr %zu is not a multiple of %zu", l2,
sizeof(*smap));
return (1);
}
end = (struct bios_smap_xattr *)((char *)p + l2);
for (smap = p; smap < end; smap++)
printf("\nSMAP type=%02x, xattr=%02x, base=%016jx, len=%016jx",
smap->type, smap->xattr, (uintmax_t)smap->base,
(uintmax_t)smap->length);
return (0);
}
#endif
static int
strIKtoi(const char *str, char **endptrp, const char *fmt)
{
int kelv;
float temp;
size_t len;
const char *p;
int prec, i;
assert(errno == 0);
len = strlen(str);
/* caller already checked this */
assert(len > 0);
/*
* A format of "IK" is in deciKelvin. A format of "IK3" is in
* milliKelvin. The single digit following IK is log10 of the
* multiplying factor to convert Kelvin into the untis of this sysctl,
* or the dividing factor to convert the sysctl value to Kelvin. Numbers
* larger than 6 will run into precision issues with 32-bit integers.
* Characters that aren't ASCII digits after the 'K' are ignored. No
* localization is present because this is an interface from the kernel
* to this program (eg not an end-user interface), so isdigit() isn't
* used here.
*/
if (fmt[2] != '\0' && fmt[2] >= '0' && fmt[2] <= '9')
prec = fmt[2] - '0';
else
prec = 1;
p = &str[len - 1];
if (*p == 'C' || *p == 'F' || *p == 'K') {
temp = strtof(str, endptrp);
if (*endptrp != str && *endptrp == p && errno == 0) {
if (*p == 'F')
temp = (temp - 32) * 5 / 9;
*endptrp = NULL;
if (*p != 'K')
temp += 273.15;
for (i = 0; i < prec; i++)
temp *= 10.0;
return ((int)(temp + 0.5));
}
} else {
/* No unit specified -> treat it as a raw number */
kelv = (int)strtol(str, endptrp, 10);
if (*endptrp != str && *endptrp == p && errno == 0) {
*endptrp = NULL;
return (kelv);
}
}
errno = ERANGE;
return (0);
}
/*
* These functions uses a presently undocumented interface to the kernel
* to walk the tree and get the type so it can print the value.
* This interface is under work and consideration, and should probably
* be killed with a big axe by the first person who can find the time.
* (be aware though, that the proper interface isn't as obvious as it
* may seem, there are various conflicting requirements.
*/
static int
name2oid(const char *name, int *oidp)
{
int oid[2];
int i;
size_t j;
oid[0] = 0;
oid[1] = 3;
j = CTL_MAXNAME * sizeof(int);
i = sysctl(oid, 2, oidp, &j, name, strlen(name));
if (i < 0)
return (i);
j /= sizeof(int);
return (j);
}
static int
oidfmt(int *oid, int len, char *fmt, u_int *kind)
{
int qoid[CTL_MAXNAME+2];
u_char buf[BUFSIZ];
int i;
size_t j;
qoid[0] = 0;
qoid[1] = 4;
memcpy(qoid + 2, oid, len * sizeof(int));
j = sizeof(buf);
i = sysctl(qoid, len + 2, buf, &j, 0, 0);
if (i)
err(1, "sysctl fmt %d %zu %d", i, j, errno);
if (kind)
*kind = *(u_int *)buf;
if (fmt)
strcpy(fmt, (char *)(buf + sizeof(u_int)));
return (0);
}
/*
* This formats and outputs the value of one variable
*
* Returns zero if anything was actually output.
* Returns one if didn't know what to do with this.
* Return minus one if we had errors.
*/
static int
show_var(int *oid, int nlen)
{
u_char buf[BUFSIZ], *val, *oval, *p;
char name[BUFSIZ], fmt[BUFSIZ];
const char *sep, *sep1, *prntype;
int qoid[CTL_MAXNAME+2];
uintmax_t umv;
intmax_t mv;
int i, hexlen, sign, ctltype;
size_t intlen;
size_t j, len;
u_int kind;
float base;
int (*func)(size_t, void *);
int prec;
/* Silence GCC. */
umv = mv = intlen = 0;
bzero(buf, BUFSIZ);
bzero(fmt, BUFSIZ);
bzero(name, BUFSIZ);
qoid[0] = 0;
memcpy(qoid + 2, oid, nlen * sizeof(int));
qoid[1] = 1;
j = sizeof(name);
i = sysctl(qoid, nlen + 2, name, &j, 0, 0);
if (i || !j)
err(1, "sysctl name %d %zu %d", i, j, errno);
oidfmt(oid, nlen, fmt, &kind);
/* if Wflag then only list sysctls that are writeable and not stats. */
if (Wflag && ((kind & CTLFLAG_WR) == 0 || (kind & CTLFLAG_STATS) != 0))
return 1;
/* if Tflag then only list sysctls that are tuneables. */
if (Tflag && (kind & CTLFLAG_TUN) == 0)
return 1;
if (Nflag) {
printf("%s", name);
return (0);
}
if (eflag)
sep = "=";
else
sep = ": ";
ctltype = (kind & CTLTYPE);
if (tflag || dflag) {
if (!nflag)
printf("%s%s", name, sep);
if (ctl_typename[ctltype] != NULL)
prntype = ctl_typename[ctltype];
else
prntype = "unknown";
if (tflag && dflag)
printf("%s%s", prntype, sep);
else if (tflag) {
printf("%s", prntype);
return (0);
}
qoid[1] = 5;
j = sizeof(buf);
i = sysctl(qoid, nlen + 2, buf, &j, 0, 0);
printf("%s", buf);
return (0);
}
/* don't fetch opaques that we don't know how to print */
if (ctltype == CTLTYPE_OPAQUE) {
if (strcmp(fmt, "S,clockinfo") == 0)
func = S_clockinfo;
else if (strcmp(fmt, "S,timeval") == 0)
func = S_timeval;
else if (strcmp(fmt, "S,loadavg") == 0)
func = S_loadavg;
else if (strcmp(fmt, "S,vmtotal") == 0)
func = S_vmtotal;
else if (strcmp(fmt, "S,input_id") == 0)
func = S_input_id;
#ifdef __amd64__
else if (strcmp(fmt, "S,efi_map_header") == 0)
func = S_efi_map;
#endif
#if defined(__amd64__) || defined(__i386__)
else if (strcmp(fmt, "S,bios_smap_xattr") == 0)
func = S_bios_smap_xattr;
#endif
else {
func = NULL;
if (!bflag && !oflag && !xflag)
return (1);
}
}
/* find an estimate of how much we need for this var */
if (Bflag)
j = Bflag;
else {
j = 0;
i = sysctl(oid, nlen, 0, &j, 0, 0);
j += j; /* we want to be sure :-) */
}
val = oval = malloc(j + 1);
if (val == NULL) {
warnx("malloc failed");
return (1);
}
len = j;
i = sysctl(oid, nlen, val, &len, 0, 0);
if (i != 0 || (len == 0 && ctltype != CTLTYPE_STRING)) {
free(oval);
return (1);
}
if (bflag) {
fwrite(val, 1, len, stdout);
free(oval);
return (0);
}
val[len] = '\0';
p = val;
sign = ctl_sign[ctltype];
intlen = ctl_size[ctltype];
switch (ctltype) {
case CTLTYPE_STRING:
if (!nflag)
printf("%s%s", name, sep);
printf("%.*s", (int)len, p);
free(oval);
return (0);
case CTLTYPE_INT:
case CTLTYPE_UINT:
case CTLTYPE_LONG:
case CTLTYPE_ULONG:
case CTLTYPE_S8:
case CTLTYPE_S16:
case CTLTYPE_S32:
case CTLTYPE_S64:
case CTLTYPE_U8:
case CTLTYPE_U16:
case CTLTYPE_U32:
case CTLTYPE_U64:
if (!nflag)
printf("%s%s", name, sep);
hexlen = 2 + (intlen * CHAR_BIT + 3) / 4;
sep1 = "";
while (len >= intlen) {
switch (kind & CTLTYPE) {
case CTLTYPE_INT:
case CTLTYPE_UINT:
umv = *(u_int *)p;
mv = *(int *)p;
break;
case CTLTYPE_LONG:
case CTLTYPE_ULONG:
umv = *(u_long *)p;
mv = *(long *)p;
break;
case CTLTYPE_S8:
case CTLTYPE_U8:
umv = *(uint8_t *)p;
mv = *(int8_t *)p;
break;
case CTLTYPE_S16:
case CTLTYPE_U16:
umv = *(uint16_t *)p;
mv = *(int16_t *)p;
break;
case CTLTYPE_S32:
case CTLTYPE_U32:
umv = *(uint32_t *)p;
mv = *(int32_t *)p;
break;
case CTLTYPE_S64:
case CTLTYPE_U64:
umv = *(uint64_t *)p;
mv = *(int64_t *)p;
break;
}
fputs(sep1, stdout);
if (xflag)
printf("%#0*jx", hexlen, umv);
else if (!sign)
printf(hflag ? "%'ju" : "%ju", umv);
else if (fmt[1] == 'K') {
if (mv < 0)
printf("%jd", mv);
else {
/*
* See strIKtoi for details on fmt.
*/
prec = 1;
if (fmt[2] != '\0')
prec = fmt[2] - '0';
base = 1.0;
for (int i = 0; i < prec; i++)
base *= 10.0;
printf("%.*fC", prec,
(float)mv / base - 273.15);
}
} else
printf(hflag ? "%'jd" : "%jd", mv);
sep1 = " ";
len -= intlen;
p += intlen;
}
free(oval);
return (0);
case CTLTYPE_OPAQUE:
i = 0;
if (func) {
if (!nflag)
printf("%s%s", name, sep);
i = (*func)(len, p);
free(oval);
return (i);
}
/* FALLTHROUGH */
default:
if (!oflag && !xflag) {
free(oval);
return (1);
}
if (!nflag)
printf("%s%s", name, sep);
printf("Format:%s Length:%zu Dump:0x", fmt, len);
while (len-- && (xflag || p < val + 16))
printf("%02x", *p++);
if (!xflag && len > 16)
printf("...");
free(oval);
return (0);
}
free(oval);
return (1);
}
static int
sysctl_all(int *oid, int len)
{
int name1[22], name2[22];
int i, j;
size_t l1, l2;
name1[0] = 0;
name1[1] = 2;
l1 = 2;
if (len) {
memcpy(name1+2, oid, len * sizeof(int));
l1 += len;
} else {
name1[2] = 1;
l1++;
}
for (;;) {
l2 = sizeof(name2);
j = sysctl(name1, l1, name2, &l2, 0, 0);
if (j < 0) {
if (errno == ENOENT)
return (0);
else
err(1, "sysctl(getnext) %d %zu", j, l2);
}
l2 /= sizeof(int);
if (len < 0 || l2 < (unsigned int)len)
return (0);
for (i = 0; i < len; i++)
if (name2[i] != oid[i])
return (0);
i = show_var(name2, l2);
if (!i && !bflag)
putchar('\n');
memcpy(name1+2, name2, l2 * sizeof(int));
l1 = 2 + l2;
}
}
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