sbin/sysctl/sysctl.c

   1 /*
   2  * Copyright (c) 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)from: sysctl.c   8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/sbin/sysctl/sysctl.c,v 1.25.2.11 2003/05/01 22:48:08 trhodes Exp $
  32  */
  33
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36 #include <sys/sysctl.h>
  37 #include <sys/resource.h>
  38 #include <sys/sensors.h>
  39 #include <sys/param.h>
  40
  41 #ifdef __x86_64__
  42 #include <sys/efi.h>
  43 #include <machine/metadata.h>
  44 #endif
  45
  46 #include <machine/inttypes.h>
  47
  48 #include <ctype.h>
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55
  56 static int      aflag, bflag, dflag, eflag, Nflag, nflag, oflag, xflag;
  57 static int      iflag, qflag;
  58
  59 static int      oidfmt(int *, size_t, char *, u_int *);
  60 static int      parse(const char *);
  61 static int      show_var(int *, size_t);
  62 static int      sysctl_all(int *, size_t);
  63 static void     set_T_dev_t(const char *, void **, size_t *);
  64 static int      set_IK(const char *, int *);
  65
  66 static void
  67 usage(void)
  68 {
  69
  70         fprintf(stderr, "%s\n%s\n",
  71             "usage: sysctl [-bdeNnox] variable[=value] ...",
  72             "       sysctl [-bdeNnox] -a");
  73         exit(1);
  74 }
  75
  76 int
  77 main(int argc, char **argv)
  78 {
  79         int ch;
  80         int warncount;
  81
  82         setbuf(stdout,0);
  83         setbuf(stderr,0);
  84
  85         while ((ch = getopt(argc, argv, "AabdeiNnoqwxX")) != -1) {
  86                 switch (ch) {
  87                 case 'A':
  88                         /* compatibility */
  89                         aflag = oflag = 1;
  90                         break;
  91                 case 'a':
  92                         aflag = 1;
  93                         break;
  94                 case 'b':
  95                         bflag = 1;
  96                         break;
  97                 case 'd':
  98                         dflag = 1;
  99                         break;
 100                 case 'e':
 101                         eflag = 1;
 102                         break;
 103                 case 'i':
 104                         iflag = 1;
 105                         break;
 106                 case 'N':
 107                         Nflag = 1;
 108                         break;
 109                 case 'n':
 110                         nflag = 1;
 111                         break;
 112                 case 'o':
 113                         oflag = 1;
 114                         break;
 115                 case 'q':
 116                         qflag = 1;
 117                         break;
 118                 case 'w':
 119                         /* compatibility */
 120                         /* ignored */
 121                         break;
 122                 case 'X':
 123                         /* compatibility */
 124                         aflag = xflag = 1;
 125                         break;
 126                 case 'x':
 127                         xflag = 1;
 128                         break;
 129                 default:
 130                         usage();
 131                 }
 132         }
 133         argc -= optind;
 134         argv += optind;
 135
 136         if (Nflag && nflag)
 137                 usage();
 138         if (aflag && argc == 0)
 139                 exit(sysctl_all(0, 0));
 140         if (argc == 0)
 141                 usage();
 142         warncount = 0;
 143         while (argc-- > 0)
 144                 warncount += parse(*argv++);
 145
 146         return warncount;
 147 }
 148
 149 /*
 150  * Parse a name into a MIB entry.
 151  * Lookup and print out the MIB entry if it exists.
 152  * Set a new value if requested.
 153  */
 154 static int
 155 parse(const char *string)
 156 {
 157         size_t len;
 158         int i, j;
 159         void *newval = NULL;
 160         uint32_t u32val;
 161         int intval;
 162         unsigned int uintval;
 163         long longval;
 164         unsigned long ulongval;
 165         size_t newsize = 0;
 166         quad_t quadval;
 167         u_quad_t uquadval;
 168         int mib[CTL_MAXNAME];
 169         char *cp, fmt[BUFSIZ];
 170         const char *name;
 171         char *name_allocated = NULL;
 172         u_int kind;
 173
 174         if ((cp = strchr(string, '=')) != NULL) {
 175                 if ((name_allocated = malloc(cp - string + 1)) == NULL)
 176                         err(1, "malloc failed");
 177                 strlcpy(name_allocated, string, cp - string + 1);
 178                 name = name_allocated;
 179
 180                 while (isspace(*++cp))
 181                         ;
 182
 183                 newval = cp;
 184                 newsize = strlen(cp);
 185         } else {
 186                 name = string;
 187         }
 188
 189         len = CTL_MAXNAME;
 190         if (sysctlnametomib(name, mib, &len) < 0) {
 191                 if (iflag)
 192                         return 0;
 193                 if (qflag)
 194                         return 1;
 195                 if (errno == ENOENT) {
 196                         errx(1, "unknown oid '%s'", name);
 197                 } else {
 198                         err(1, "sysctlnametomib(\"%s\")", name);
 199                 }
 200         }
 201
 202         if (oidfmt(mib, len, fmt, &kind)) {
 203                 warn("couldn't find format of oid '%s'", name);
 204                 if (iflag)
 205                         return 1;
 206                 exit(1);
 207         }
 208
 209         if (newval == NULL) {
 210                 if ((kind & CTLTYPE) == CTLTYPE_NODE) {
 211                         sysctl_all(mib, len);
 212                 } else {
 213                         i = show_var(mib, len);
 214                         if (!i && !bflag)
 215                                 putchar('\n');
 216                 }
 217         } else {
 218                 if ((kind & CTLTYPE) == CTLTYPE_NODE)
 219                         errx(1, "oid '%s' isn't a leaf node", name);
 220
 221                 if (!(kind&CTLFLAG_WR))
 222                         errx(1, "oid '%s' is read only", name);
 223
 224                 switch (kind & CTLTYPE) {
 225                         case CTLTYPE_INT:
 226                                 if (!(strcmp(fmt, "IK") == 0)) {
 227                                         if (!set_IK(newval, &intval))
 228                                                 errx(1, "invalid value '%s'",
 229                                                     (char *)newval);
 230                                 } else
 231                                         intval = (int) strtol(newval, NULL, 0);
 232                                 newval = &intval;
 233                                 newsize = sizeof(intval);
 234                                 break;
 235                         case CTLTYPE_UINT:
 236                                 uintval = (int) strtoul(newval, NULL, 0);
 237                                 newval = &uintval;
 238                                 newsize = sizeof uintval;
 239                                 break;
 240                         case CTLTYPE_LONG:
 241                                 longval = strtol(newval, NULL, 0);
 242                                 newval = &longval;
 243                                 newsize = sizeof longval;
 244                                 break;
 245                         case CTLTYPE_ULONG:
 246                                 ulongval = strtoul(newval, NULL, 0);
 247                                 newval = &ulongval;
 248                                 newsize = sizeof ulongval;
 249                                 break;
 250                         case CTLTYPE_STRING:
 251                                 break;
 252                         case CTLTYPE_QUAD:
 253                                 quadval = strtoq(newval, NULL, 0);
 254                                 newval = &quadval;
 255                                 newsize = sizeof(quadval);
 256                                 break;
 257                         case CTLTYPE_UQUAD:
 258                                 uquadval = strtouq(newval, NULL, 0);
 259                                 newval = &uquadval;
 260                                 newsize = sizeof(uquadval);
 261                                 break;
 262                         case CTLTYPE_U32:
 263                                 u32val = (uint32_t)strtoul(newval, NULL, 0);
 264                                 newval = &u32val;
 265                                 newsize = sizeof(u32val);
 266                                 break;
 267                         case CTLTYPE_OPAQUE:
 268                                 if (strcmp(fmt, "T,dev_t") == 0 ||
 269                                     strcmp(fmt, "T,udev_t") == 0
 270                                 ) {
 271                                         set_T_dev_t((char*)newval, &newval,
 272                                                     &newsize);
 273                                         break;
 274                                 }
 275                                 /* FALLTHROUGH */
 276                         default:
 277                                 errx(1, "oid '%s' is type %d,"
 278                                         " cannot set that", name,
 279                                         kind & CTLTYPE);
 280                 }
 281
 282                 i = show_var(mib, len);
 283                 if (sysctl(mib, len, 0, 0, newval, newsize) == -1) {
 284                         if (!i && !bflag)
 285                                 putchar('\n');
 286                         switch (errno) {
 287                         case EOPNOTSUPP:
 288                                 errx(1, "%s: value is not available",
 289                                         string);
 290                         case ENOTDIR:
 291                                 errx(1, "%s: specification is incomplete",
 292                                         string);
 293                         case ENOMEM:
 294                                 errx(1, "%s: type is unknown to this program",
 295                                         string);
 296                         default:
 297                                 warn("%s", string);
 298                                 return 1;
 299                         }
 300                 }
 301                 if (!bflag)
 302                         printf(" -> ");
 303                 i = nflag;
 304                 nflag = 1;
 305                 j = show_var(mib, len);
 306                 if (!j && !bflag)
 307                         putchar('\n');
 308                 nflag = i;
 309         }
 310
 311         if (name_allocated != NULL)
 312                 free(name_allocated);
 313
 314         return 0;
 315 }
 316
 317 /* These functions will dump out various interesting structures. */
 318
 319 static int
 320 S_clockinfo(size_t l2, void *p)
 321 {
 322         struct clockinfo *ci = (struct clockinfo*)p;
 323         if (l2 != sizeof(*ci))
 324                 err(1, "S_clockinfo %zu != %zu", l2, sizeof(*ci));
 325         printf("{ hz = %d, tick = %d, tickadj = %d, profhz = %d, stathz = %d }",
 326                 ci->hz, ci->tick, ci->tickadj, ci->profhz, ci->stathz);
 327         return (0);
 328 }
 329
 330 static int
 331 S_loadavg(size_t l2, void *p)
 332 {
 333         struct loadavg *tv = (struct loadavg*)p;
 334
 335         if (l2 != sizeof(*tv))
 336                 err(1, "S_loadavg %zu != %zu", l2, sizeof(*tv));
 337
 338         printf("{ %.2f %.2f %.2f }",
 339                 (double)tv->ldavg[0]/(double)tv->fscale,
 340                 (double)tv->ldavg[1]/(double)tv->fscale,
 341                 (double)tv->ldavg[2]/(double)tv->fscale);
 342         return (0);
 343 }
 344
 345 static int
 346 S_timespec(size_t l2, void *p)
 347 {
 348         struct timespec *ts = (struct timespec*)p;
 349         time_t tv_sec;
 350         char *p1, *p2;
 351
 352         if (l2 != sizeof(*ts))
 353                 err(1, "S_timespec %zu != %zu", l2, sizeof(*ts));
 354         printf("{ sec = %ld, nsec = %ld } ",
 355                 ts->tv_sec, ts->tv_nsec);
 356         tv_sec = ts->tv_sec;
 357         p1 = strdup(ctime(&tv_sec));
 358         for (p2=p1; *p2 ; p2++)
 359                 if (*p2 == '\n')
 360                         *p2 = '\0';
 361         fputs(p1, stdout);
 362         return (0);
 363 }
 364
 365 static int
 366 S_timeval(size_t l2, void *p)
 367 {
 368         struct timeval *tv = (struct timeval*)p;
 369         time_t tv_sec;
 370         char *p1, *p2;
 371
 372         if (l2 != sizeof(*tv))
 373                 err(1, "S_timeval %zu != %zu", l2, sizeof(*tv));
 374         printf("{ sec = %ld, usec = %ld } ",
 375                 tv->tv_sec, tv->tv_usec);
 376         tv_sec = tv->tv_sec;
 377         p1 = strdup(ctime(&tv_sec));
 378         for (p2=p1; *p2 ; p2++)
 379                 if (*p2 == '\n')
 380                         *p2 = '\0';
 381         fputs(p1, stdout);
 382         return (0);
 383 }
 384
 385 static int
 386 S_sensor(size_t l2, void *p)
 387 {
 388         struct sensor *s = (struct sensor *)p;
 389
 390         if (l2 != sizeof(*s)) {
 391                 warnx("S_sensor %zu != %zu", l2, sizeof(*s));
 392                 return (1);
 393         }
 394
 395         if (s->flags & SENSOR_FINVALID) {
 396                 /*
 397                  * XXX: with this flag, the node should be entirely ignored,
 398                  * but as the magic-based sysctl(8) is not too flexible, we
 399                  * simply have to print out that the sensor is invalid.
 400                  */
 401                 printf("invalid");
 402                 return (0);
 403         }
 404
 405         if (s->flags & SENSOR_FUNKNOWN)
 406                 printf("unknown");
 407         else {
 408                 switch (s->type) {
 409                 case SENSOR_TEMP:
 410                         printf("%.2f degC",
 411                             (s->value - 273150000) / 1000000.0);
 412                         break;
 413                 case SENSOR_FANRPM:
 414                         printf("%jd RPM", (intmax_t)s->value);
 415                         break;
 416                 case SENSOR_VOLTS_DC:
 417                         printf("%.2f VDC", s->value / 1000000.0);
 418                         break;
 419                 case SENSOR_WATTS:
 420                         printf("%.2f W", s->value / 1000000.0);
 421                         break;
 422                 case SENSOR_AMPS:
 423                         printf("%.2f A", s->value / 1000000.0);
 424                         break;
 425                 case SENSOR_WATTHOUR:
 426                         printf("%.2f Wh", s->value / 1000000.0);
 427                         break;
 428                 case SENSOR_AMPHOUR:
 429                         printf("%.2f Ah", s->value / 1000000.0);
 430                         break;
 431                 case SENSOR_INDICATOR:
 432                         printf("%s", s->value ? "On" : "Off");
 433                         break;
 434                 case SENSOR_FREQ:
 435                         printf("%jd Hz", (intmax_t)s->value);
 436                         break;
 437                 case SENSOR_ECC:
 438                 case SENSOR_INTEGER:
 439                         printf("%jd", (intmax_t)s->value);
 440                         break;
 441                 case SENSOR_PERCENT:
 442                         printf("%.2f%%", s->value / 1000.0);
 443                         break;
 444                 case SENSOR_LUX:
 445                         printf("%.2f lx", s->value / 1000000.0);
 446                         break;
 447                 case SENSOR_DRIVE:
 448                 {
 449                         const char *name;
 450
 451                         switch (s->value) {
 452                         case SENSOR_DRIVE_EMPTY:
 453                                 name = "empty";
 454                                 break;
 455                         case SENSOR_DRIVE_READY:
 456                                 name = "ready";
 457                                 break;
 458                         case SENSOR_DRIVE_POWERUP:
 459                                 name = "powering up";
 460                                 break;
 461                         case SENSOR_DRIVE_ONLINE:
 462                                 name = "online";
 463                                 break;
 464                         case SENSOR_DRIVE_IDLE:
 465                                 name = "idle";
 466                                 break;
 467                         case SENSOR_DRIVE_ACTIVE:
 468                                 name = "active";
 469                                 break;
 470                         case SENSOR_DRIVE_REBUILD:
 471                                 name = "rebuilding";
 472                                 break;
 473                         case SENSOR_DRIVE_POWERDOWN:
 474                                 name = "powering down";
 475                                 break;
 476                         case SENSOR_DRIVE_FAIL:
 477                                 name = "failed";
 478                                 break;
 479                         case SENSOR_DRIVE_PFAIL:
 480                                 name = "degraded";
 481                                 break;
 482                         default:
 483                                 name = "unknown";
 484                                 break;
 485                         }
 486                         printf("%s", name);
 487                         break;
 488                 }
 489                 case SENSOR_TIMEDELTA:
 490                         printf("%.6f secs", s->value / 1000000000.0);
 491                         break;
 492                 default:
 493                         printf("unknown");
 494                 }
 495         }
 496
 497         if (s->desc[0] != '\0')
 498                 printf(" (%s)", s->desc);
 499
 500         switch (s->status) {
 501         case SENSOR_S_UNSPEC:
 502                 break;
 503         case SENSOR_S_OK:
 504                 printf(", OK");
 505                 break;
 506         case SENSOR_S_WARN:
 507                 printf(", WARNING");
 508                 break;
 509         case SENSOR_S_CRIT:
 510                 printf(", CRITICAL");
 511                 break;
 512         case SENSOR_S_UNKNOWN:
 513                 printf(", UNKNOWN");
 514                 break;
 515         }
 516
 517         if (s->tv.tv_sec) {
 518                 time_t t = s->tv.tv_sec;
 519                 char ct[26];
 520
 521                 ctime_r(&t, ct);
 522                 ct[19] = '\0';
 523                 printf(", %s.%03ld", ct, s->tv.tv_usec / 1000);
 524         }
 525
 526         return (0);
 527 }
 528
 529 #ifdef __x86_64__
 530 static int
 531 S_efi_map(size_t l2, void *p)
 532 {
 533         struct efi_map_header *efihdr;
 534         struct efi_md *map;
 535         const char *type;
 536         size_t efisz;
 537         int ndesc, i;
 538
 539         static const char *types[] = {
 540                 "Reserved",
 541                 "LoaderCode",
 542                 "LoaderData",
 543                 "BootServicesCode",
 544                 "BootServicesData",
 545                 "RuntimeServicesCode",
 546                 "RuntimeServicesData",
 547                 "ConventionalMemory",
 548                 "UnusableMemory",
 549                 "ACPIReclaimMemory",
 550                 "ACPIMemoryNVS",
 551                 "MemoryMappedIO",
 552                 "MemoryMappedIOPortSpace",
 553                 "PalCode"
 554         };
 555
 556         /*
 557          * Memory map data provided by UEFI via the GetMemoryMap
 558          * Boot Services API.
 559          */
 560         if (l2 < sizeof(*efihdr)) {
 561                 warnx("S_efi_map length less than header");
 562                 return (1);
 563         }
 564         efihdr = p;
 565         efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf;
 566         map = (struct efi_md *)((uint8_t *)efihdr + efisz);
 567
 568         if (efihdr->descriptor_size == 0)
 569                 return (0);
 570         if (l2 != efisz + efihdr->memory_size) {
 571                 warnx("S_efi_map length mismatch %zu vs %zu", l2, efisz +
 572                     efihdr->memory_size);
 573                 return (1);
 574         }
 575         ndesc = efihdr->memory_size / efihdr->descriptor_size;
 576
 577         printf("\n%23s %12s %12s %8s %4s",
 578             "Type", "Physical", "Virtual", "#Pages", "Attr");
 579
 580         for (i = 0; i < ndesc; i++,
 581             map = efi_next_descriptor(map, efihdr->descriptor_size)) {
 582                 if (map->md_type <= EFI_MD_TYPE_PALCODE)
 583                         type = types[map->md_type];
 584                 else
 585                         type = "<INVALID>";
 586                 printf("\n%23s %012lx %12p %08lx ", type, map->md_phys,
 587                     map->md_virt, map->md_pages);
 588                 if (map->md_attr & EFI_MD_ATTR_UC)
 589                         printf("UC ");
 590                 if (map->md_attr & EFI_MD_ATTR_WC)
 591                         printf("WC ");
 592                 if (map->md_attr & EFI_MD_ATTR_WT)
 593                         printf("WT ");
 594                 if (map->md_attr & EFI_MD_ATTR_WB)
 595                         printf("WB ");
 596                 if (map->md_attr & EFI_MD_ATTR_UCE)
 597                         printf("UCE ");
 598                 if (map->md_attr & EFI_MD_ATTR_WP)
 599                         printf("WP ");
 600                 if (map->md_attr & EFI_MD_ATTR_RP)
 601                         printf("RP ");
 602                 if (map->md_attr & EFI_MD_ATTR_XP)
 603                         printf("XP ");
 604                 if (map->md_attr & EFI_MD_ATTR_RT)
 605                         printf("RUNTIME");
 606         }
 607         return (0);
 608 }
 609 #endif
 610
 611 static int
 612 T_dev_t(size_t l2, void *p)
 613 {
 614         dev_t *d = (dev_t *)p;
 615         if (l2 != sizeof(*d))
 616                 err(1, "T_dev_T %zu != %zu", l2, sizeof(*d));
 617         if ((int)(*d) != -1) {
 618                 if (minor(*d) > 255 || minor(*d) < 0)
 619                         printf("{ major = %d, minor = 0x%x }",
 620                                 major(*d), minor(*d));
 621                 else
 622                         printf("{ major = %d, minor = %d }",
 623                                 major(*d), minor(*d));
 624         }
 625         return (0);
 626 }
 627
 628 static void
 629 set_T_dev_t(const char *path, void **val, size_t *size)
 630 {
 631         static struct stat statb;
 632
 633         if (strcmp(path, "none") && strcmp(path, "off")) {
 634                 int rc = stat (path, &statb);
 635                 if (rc) {
 636                         err(1, "cannot stat %s", path);
 637                 }
 638
 639                 if (!S_ISCHR(statb.st_mode)) {
 640                         errx(1, "must specify a device special file.");
 641                 }
 642         } else {
 643                 statb.st_rdev = NODEV;
 644         }
 645         *val = (char*) &statb.st_rdev;
 646         *size = sizeof statb.st_rdev;
 647 }
 648
 649 static int
 650 set_IK(const char *str, int *val)
 651 {
 652         float temp;
 653         int len, kelv;
 654         const char *p;
 655         char *endptr;
 656
 657         if ((len = strlen(str)) == 0)
 658                 return (0);
 659         p = &str[len - 1];
 660         if (*p == 'C' || *p == 'F') {
 661                 temp = strtof(str, &endptr);
 662                 if (endptr == str || endptr != p)
 663                         return 0;
 664                 if (*p == 'F')
 665                         temp = (temp - 32) * 5 / 9;
 666                 kelv = temp * 10 + 2732;
 667         } else {
 668                 /*
 669                  * I would like to just use, 0 but it would make numbers
 670                  * like '023' which were interpreted as decimal before
 671                  * suddenly interpreted as octal.
 672                  */
 673                 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
 674                         kelv = (int)strtol(str, &endptr, 0);
 675                 else
 676                         kelv = (int)strtol(str, &endptr, 10);
 677                 if (endptr == str || *endptr != '\0')
 678                         return 0;
 679         }
 680         *val = kelv;
 681         return 1;
 682 }
 683
 684 /*
 685  * These functions uses a presently undocumented interface to the kernel
 686  * to walk the tree and get the type so it can print the value.
 687  * This interface is under work and consideration, and should probably
 688  * be killed with a big axe by the first person who can find the time.
 689  * (be aware though, that the proper interface isn't as obvious as it
 690  * may seem, there are various conflicting requirements.
 691  */
 692
 693 static int
 694 oidfmt(int *oid, size_t len, char *fmt, u_int *kind)
 695 {
 696         int qoid[CTL_MAXNAME+2];
 697         u_char buf[BUFSIZ];
 698         int i;
 699         size_t j;
 700
 701         qoid[0] = 0;
 702         qoid[1] = 4;
 703         memcpy(qoid + 2, oid, len * sizeof(int));
 704
 705         j = sizeof(buf);
 706         i = sysctl(qoid, len + 2, buf, &j, 0, 0);
 707         if (i)
 708                 err(1, "sysctl fmt %d %zu %d", i, j, errno);
 709
 710         if (kind)
 711                 *kind = *(u_int *)buf;
 712
 713         if (fmt)
 714                 strcpy(fmt, (char *)(buf + sizeof(u_int)));
 715         return 0;
 716 }
 717
 718 /*
 719  * This formats and outputs the value of one variable
 720  *
 721  * Returns zero if anything was actually output.
 722  * Returns one if didn't know what to do with this.
 723  * Return minus one if we had errors.
 724  */
 725
 726 static int
 727 show_var(int *oid, size_t nlen)
 728 {
 729         u_char buf[BUFSIZ], *val = NULL, *p, *nul;
 730         char name[BUFSIZ], *fmt;
 731         const char *sep, *spacer;
 732         int qoid[CTL_MAXNAME+2];
 733         int i;
 734         size_t j, len;
 735         u_int kind;
 736         int (*func)(size_t, void *);
 737         int error = 0;
 738
 739         qoid[0] = 0;
 740         memcpy(qoid + 2, oid, nlen * sizeof(int));
 741
 742         qoid[1] = 1;
 743         j = sizeof(name);
 744         i = sysctl(qoid, nlen + 2, name, &j, 0, 0);
 745         if (i || !j)
 746                 err(1, "sysctl name %d %zu %d", i, j, errno);
 747
 748         if (Nflag) {
 749                 printf("%s", name);
 750                 return (0);
 751         }
 752
 753         if (eflag)
 754                 sep = "=";
 755         else
 756                 sep = ": ";
 757
 758         if (dflag) {    /* just print description */
 759                 qoid[1] = 5;
 760                 j = sizeof(buf);
 761                 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0);
 762                 if (!nflag)
 763                         printf("%s%s", name, sep);
 764                 printf("%s", buf);
 765                 return(0);
 766         }
 767         /* find an estimate of how much we need for this var */
 768         j = 0;
 769         i = sysctl(oid, nlen, 0, &j, 0, 0);
 770         j += j; /* we want to be sure :-) */
 771
 772         val = malloc(j + 1);
 773         if (val == NULL)
 774                 return (1);
 775
 776         len = j;
 777         i = sysctl(oid, nlen, val, &len, 0, 0);
 778         if (i || !len) {
 779                 error = 1;
 780                 goto done;
 781         }
 782
 783         if (bflag) {
 784                 fwrite(val, 1, len, stdout);
 785                 goto done;
 786         }
 787
 788         val[len] = '\0';
 789         fmt = buf;
 790         oidfmt(oid, nlen, fmt, &kind);
 791         p = val;
 792         switch (*fmt) {
 793         case 'A':
 794                 if (!nflag)
 795                         printf("%s%s", name, sep);
 796                 nul = memchr(p, '\0', len);
 797                 fwrite(p, nul == NULL ? (int)len : nul - p, 1, stdout);
 798                 return (0);
 799
 800         case 'I':
 801                 if (!nflag)
 802                         printf("%s%s", name, sep);
 803                 fmt++;
 804                 spacer = "";
 805                 while (len >= sizeof(int)) {
 806                         if(*fmt == 'U')
 807                                 printf("%s%u", spacer, *(unsigned int *)p);
 808                         else if (*fmt == 'K' && *(int *)p >= 0)
 809                                 printf("%s%.1fC", spacer, (*(int *)p - 2732) / 10.0);
 810                         else
 811                                 printf("%s%d", spacer, *(int *)p);
 812                         spacer = " ";
 813                         len -= sizeof(int);
 814                         p += sizeof(int);
 815                 }
 816                 goto done;
 817
 818         case 'L':
 819                 if (!nflag)
 820                         printf("%s%s", name, sep);
 821                 fmt++;
 822                 spacer = "";
 823                 while (len >= sizeof(long)) {
 824                         if(*fmt == 'U')
 825                                 printf("%s%lu", spacer, *(unsigned long *)p);
 826                         else
 827                                 printf("%s%ld", spacer, *(long *)p);
 828                         spacer = " ";
 829                         len -= sizeof(long);
 830                         p += sizeof(long);
 831                 }
 832                 goto done;
 833
 834         case 'P':
 835                 if (!nflag)
 836                         printf("%s%s", name, sep);
 837                 printf("%p", *(void **)p);
 838                 goto done;
 839
 840         case 'Q':
 841                 if (!nflag)
 842                         printf("%s%s", name, sep);
 843                 fmt++;
 844                 spacer = "";
 845                 while (len >= sizeof(quad_t)) {
 846                         if(*fmt == 'U') {
 847                                 printf("%s%ju",
 848                                        spacer, (uintmax_t)*(u_quad_t *)p);
 849                         } else {
 850                                 printf("%s%jd",
 851                                        spacer, (intmax_t)*(quad_t *)p);
 852                         }
 853                         spacer = " ";
 854                         len -= sizeof(int64_t);
 855                         p += sizeof(int64_t);
 856                 }
 857                 goto done;
 858
 859         case 'T':
 860         case 'S':
 861                 if (!oflag && !xflag) {
 862                         i = 0;
 863                         if (strcmp(fmt, "S,clockinfo") == 0)
 864                                 func = S_clockinfo;
 865                         else if (strcmp(fmt, "S,timespec") == 0)
 866                                 func = S_timespec;
 867                         else if (strcmp(fmt, "S,timeval") == 0)
 868                                 func = S_timeval;
 869                         else if (strcmp(fmt, "S,loadavg") == 0)
 870                                 func = S_loadavg;
 871                         else if (strcmp(fmt, "S,sensor") == 0)
 872                                 func = S_sensor;
 873 #ifdef __x86_64__
 874                         else if (strcmp(fmt, "S,efi_map_header") == 0)
 875                                 func = S_efi_map;
 876 #endif
 877                         else if (strcmp(fmt, "T,dev_t") == 0)
 878                                 func = T_dev_t;
 879                         else if (strcmp(fmt, "T,udev_t") == 0)
 880                                 func = T_dev_t;
 881                         else
 882                                 func = NULL;
 883                         if (func) {
 884                                 if (!nflag)
 885                                         printf("%s%s", name, sep);
 886                                 error = (*func)(len, p);
 887                                 goto done;
 888                         }
 889                 }
 890                 /* FALL THROUGH */
 891         default:
 892                 if (!oflag && !xflag) {
 893                         error = 1;
 894                         goto done;
 895                 }
 896                 if (!nflag)
 897                         printf("%s%s", name, sep);
 898                 printf("Format:%s Length:%zu Dump:0x", fmt, len);
 899                 while (len-- && (xflag || p < val + 16))
 900                         printf("%02x", *p++);
 901                 if (!xflag && len > 16)
 902                         printf("...");
 903                 goto done;
 904         }
 905
 906 done:
 907         if (val != NULL)
 908                 free(val);
 909         return (error);
 910 }
 911
 912 static int
 913 sysctl_all(int *oid, size_t len)
 914 {
 915         int name1[22], name2[22];
 916         int retval;
 917         size_t i, l1, l2;
 918
 919         name1[0] = 0;
 920         name1[1] = 2;
 921         l1 = 2;
 922         if (len) {
 923                 memcpy(name1+2, oid, len * sizeof(int));
 924                 l1 += len;
 925         } else {
 926                 name1[2] = 1;
 927                 l1++;
 928         }
 929         for (;;) {
 930                 l2 = sizeof(name2);
 931                 retval = sysctl(name1, l1, name2, &l2, 0, 0);
 932                 if (retval < 0) {
 933                         if (errno == ENOENT)
 934                                 return 0;
 935                         else
 936                                 err(1, "sysctl(getnext) %d %zu", retval, l2);
 937                 }
 938
 939                 l2 /= sizeof(int);
 940
 941                 if (l2 < len)
 942                         return 0;
 943
 944                 for (i = 0; i < len; i++)
 945                         if (name2[i] != oid[i])
 946                                 return 0;
 947
 948                 retval = show_var(name2, l2);
 949                 if (retval == 0 && !bflag)
 950                         putchar('\n');
 951
 952                 memcpy(name1+2, name2, l2 * sizeof(int));
 953                 l1 = 2 + l2;
 954         }
 955 }