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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1993 The Regents of the University of California. All rights reserved. 34 * @(#)from: sysctl.c 8.1 (Berkeley) 6/6/93 35 * $FreeBSD: src/sbin/sysctl/sysctl.c,v 1.25.2.11 2003/05/01 22:48:08 trhodes Exp $ 36 * $DragonFly: src/sbin/sysctl/sysctl.c,v 1.14 2007/01/05 23:00:10 corecode Exp $ 37 */ 38 39 #ifdef __i386__ 40 #include <sys/diskslice.h> /* used for bootdev parsing */ 41 #include <sys/reboot.h> /* used for bootdev parsing */ 42 #endif 43 #include <sys/types.h> 44 #include <sys/stat.h> 45 #include <sys/sysctl.h> 46 #include <sys/resource.h> 47 #include <sys/param.h> 48 49 #include <machine/inttypes.h> 50 51 #include <ctype.h> 52 #include <err.h> 53 #include <errno.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 static int aflag, bflag, dflag, eflag, Nflag, nflag, oflag, xflag; 60 61 static int oidfmt(int *, size_t, char *, u_int *); 62 static void parse(const char *); 63 static int show_var(int *, size_t); 64 static int sysctl_all(int *, size_t); 65 static void set_T_dev_t(const char *, void **, int *); 66 67 static void 68 usage(void) 69 { 70 71 fprintf(stderr, "%s\n%s\n", 72 "usage: sysctl [-bdeNnox] variable[=value] ...", 73 " sysctl [-bdeNnox] -a"); 74 exit(1); 75 } 76 77 int 78 main(int argc, char **argv) 79 { 80 int ch; 81 setbuf(stdout,0); 82 setbuf(stderr,0); 83 84 while ((ch = getopt(argc, argv, "AabdeNnowxX")) != -1) { 85 switch (ch) { 86 case 'A': 87 /* compatibility */ 88 aflag = oflag = 1; 89 break; 90 case 'a': 91 aflag = 1; 92 break; 93 case 'b': 94 bflag = 1; 95 break; 96 case 'd': 97 dflag = 1; 98 break; 99 case 'e': 100 eflag = 1; 101 break; 102 case 'N': 103 Nflag = 1; 104 break; 105 case 'n': 106 nflag = 1; 107 break; 108 case 'o': 109 oflag = 1; 110 break; 111 case 'w': 112 /* compatibility */ 113 /* ignored */ 114 break; 115 case 'X': 116 /* compatibility */ 117 aflag = xflag = 1; 118 break; 119 case 'x': 120 xflag = 1; 121 break; 122 default: 123 usage(); 124 } 125 } 126 argc -= optind; 127 argv += optind; 128 129 if (Nflag && nflag) 130 usage(); 131 if (aflag && argc == 0) 132 exit(sysctl_all(0, 0)); 133 if (argc == 0) 134 usage(); 135 while (argc-- > 0) 136 parse(*argv++); 137 exit(0); 138 } 139 140 /* 141 * Parse a name into a MIB entry. 142 * Lookup and print out the MIB entry if it exists. 143 * Set a new value if requested. 144 */ 145 static void 146 parse(const char *string) 147 { 148 size_t len; 149 int i, j; 150 void *newval = NULL; 151 int intval; 152 unsigned int uintval; 153 long longval; 154 unsigned long ulongval; 155 size_t newsize = 0; 156 quad_t quadval; 157 u_quad_t uquadval; 158 int mib[CTL_MAXNAME]; 159 char *cp, fmt[BUFSIZ]; 160 const char *name; 161 char *name_allocated = NULL; 162 u_int kind; 163 164 if ((cp = strchr(string, '=')) != NULL) { 165 if ((name_allocated = malloc(cp - string + 1)) == NULL) 166 err(1, "malloc failed"); 167 strlcpy(name_allocated, string, cp - string + 1); 168 name = name_allocated; 169 170 while (isspace(*++cp)) 171 ; 172 173 newval = cp; 174 newsize = strlen(cp); 175 } else { 176 name = string; 177 } 178 179 len = CTL_MAXNAME; 180 if (sysctlnametomib(name, mib, &len) < 0) { 181 if (errno == ENOENT) { 182 errx(1, "unknown oid '%s'", name); 183 } else { 184 err(1, "sysctlnametomib(\"%s\")", name); 185 } 186 } 187 188 if (oidfmt(mib, len, fmt, &kind)) 189 err(1, "couldn't find format of oid '%s'", name); 190 191 if (newval == NULL) { 192 if ((kind & CTLTYPE) == CTLTYPE_NODE) { 193 sysctl_all(mib, len); 194 } else { 195 i = show_var(mib, len); 196 if (!i && !bflag) 197 putchar('\n'); 198 } 199 } else { 200 if ((kind & CTLTYPE) == CTLTYPE_NODE) 201 errx(1, "oid '%s' isn't a leaf node", name); 202 203 if (!(kind&CTLFLAG_WR)) 204 errx(1, "oid '%s' is read only", name); 205 206 switch (kind & CTLTYPE) { 207 case CTLTYPE_INT: 208 intval = (int) strtol(newval, NULL, 0); 209 newval = &intval; 210 newsize = sizeof(intval); 211 break; 212 case CTLTYPE_UINT: 213 uintval = (int) strtoul(newval, NULL, 0); 214 newval = &uintval; 215 newsize = sizeof uintval; 216 break; 217 case CTLTYPE_LONG: 218 longval = strtol(newval, NULL, 0); 219 newval = &longval; 220 newsize = sizeof longval; 221 break; 222 case CTLTYPE_ULONG: 223 ulongval = strtoul(newval, NULL, 0); 224 newval = &ulongval; 225 newsize = sizeof ulongval; 226 break; 227 case CTLTYPE_STRING: 228 break; 229 case CTLTYPE_QUAD: 230 quadval = strtoq(newval, NULL, 0); 231 newval = &quadval; 232 newsize = sizeof(quadval); 233 break; 234 case CTLTYPE_UQUAD: 235 uquadval = strtouq(newval, NULL, 0); 236 newval = &quadval; 237 newsize = sizeof(quadval); 238 break; 239 case CTLTYPE_OPAQUE: 240 if (strcmp(fmt, "T,dev_t") == 0 || 241 strcmp(fmt, "T,udev_t") == 0 242 ) { 243 set_T_dev_t((char*)newval, &newval, 244 &newsize); 245 break; 246 } 247 /* FALLTHROUGH */ 248 default: 249 errx(1, "oid '%s' is type %d," 250 " cannot set that", name, 251 kind & CTLTYPE); 252 } 253 254 i = show_var(mib, len); 255 if (sysctl(mib, len, 0, 0, newval, newsize) == -1) { 256 if (!i && !bflag) 257 putchar('\n'); 258 switch (errno) { 259 case EOPNOTSUPP: 260 errx(1, "%s: value is not available", 261 string); 262 case ENOTDIR: 263 errx(1, "%s: specification is incomplete", 264 string); 265 case ENOMEM: 266 errx(1, "%s: type is unknown to this program", 267 string); 268 default: 269 warn("%s", string); 270 return; 271 } 272 } 273 if (!bflag) 274 printf(" -> "); 275 i = nflag; 276 nflag = 1; 277 j = show_var(mib, len); 278 if (!j && !bflag) 279 putchar('\n'); 280 nflag = i; 281 } 282 283 if (name_allocated != NULL) 284 free(name_allocated); 285 } 286 287 /* These functions will dump out various interesting structures. */ 288 289 static int 290 S_clockinfo(int l2, void *p) 291 { 292 struct clockinfo *ci = (struct clockinfo*)p; 293 if (l2 != sizeof(*ci)) 294 err(1, "S_clockinfo %d != %d", l2, sizeof(*ci)); 295 printf("{ hz = %d, tick = %d, tickadj = %d, profhz = %d, stathz = %d }", 296 ci->hz, ci->tick, ci->tickadj, ci->profhz, ci->stathz); 297 return (0); 298 } 299 300 static int 301 S_loadavg(int l2, void *p) 302 { 303 struct loadavg *tv = (struct loadavg*)p; 304 305 if (l2 != sizeof(*tv)) 306 err(1, "S_loadavg %d != %d", l2, sizeof(*tv)); 307 308 printf("{ %.2f %.2f %.2f }", 309 (double)tv->ldavg[0]/(double)tv->fscale, 310 (double)tv->ldavg[1]/(double)tv->fscale, 311 (double)tv->ldavg[2]/(double)tv->fscale); 312 return (0); 313 } 314 315 static int 316 S_timespec(int l2, void *p) 317 { 318 struct timespec *ts = (struct timespec*)p; 319 time_t tv_sec; 320 char *p1, *p2; 321 322 if (l2 != sizeof(*ts)) 323 err(1, "S_timespec %d != %d", l2, sizeof(*ts)); 324 printf("{ sec = %ld, nsec = %ld } ", 325 ts->tv_sec, ts->tv_nsec); 326 tv_sec = ts->tv_sec; 327 p1 = strdup(ctime(&tv_sec)); 328 for (p2=p1; *p2 ; p2++) 329 if (*p2 == '\n') 330 *p2 = '\0'; 331 fputs(p1, stdout); 332 return (0); 333 } 334 335 static int 336 S_timeval(int l2, void *p) 337 { 338 struct timeval *tv = (struct timeval*)p; 339 time_t tv_sec; 340 char *p1, *p2; 341 342 if (l2 != sizeof(*tv)) 343 err(1, "S_timeval %d != %d", l2, sizeof(*tv)); 344 printf("{ sec = %ld, usec = %ld } ", 345 tv->tv_sec, tv->tv_usec); 346 tv_sec = tv->tv_sec; 347 p1 = strdup(ctime(&tv_sec)); 348 for (p2=p1; *p2 ; p2++) 349 if (*p2 == '\n') 350 *p2 = '\0'; 351 fputs(p1, stdout); 352 return (0); 353 } 354 355 static int 356 T_dev_t(int l2, void *p) 357 { 358 dev_t *d = (dev_t *)p; 359 if (l2 != sizeof(*d)) 360 err(1, "T_dev_T %d != %d", l2, sizeof(*d)); 361 if ((int)(*d) != -1) { 362 if (minor(*d) > 255 || minor(*d) < 0) 363 printf("{ major = %d, minor = 0x%x }", 364 major(*d), minor(*d)); 365 else 366 printf("{ major = %d, minor = %d }", 367 major(*d), minor(*d)); 368 } 369 return (0); 370 } 371 372 static void 373 set_T_dev_t(const char *path, void **val, int *size) 374 { 375 static struct stat statb; 376 377 if (strcmp(path, "none") && strcmp(path, "off")) { 378 int rc = stat (path, &statb); 379 if (rc) { 380 err(1, "cannot stat %s", path); 381 } 382 383 if (!S_ISCHR(statb.st_mode)) { 384 errx(1, "must specify a device special file."); 385 } 386 } else { 387 statb.st_rdev = NODEV; 388 } 389 *val = (char*) &statb.st_rdev; 390 *size = sizeof statb.st_rdev; 391 } 392 393 /* 394 * These functions uses a presently undocumented interface to the kernel 395 * to walk the tree and get the type so it can print the value. 396 * This interface is under work and consideration, and should probably 397 * be killed with a big axe by the first person who can find the time. 398 * (be aware though, that the proper interface isn't as obvious as it 399 * may seem, there are various conflicting requirements. 400 */ 401 402 static int 403 oidfmt(int *oid, size_t len, char *fmt, u_int *kind) 404 { 405 int qoid[CTL_MAXNAME+2]; 406 u_char buf[BUFSIZ]; 407 int i; 408 size_t j; 409 410 qoid[0] = 0; 411 qoid[1] = 4; 412 memcpy(qoid + 2, oid, len * sizeof(int)); 413 414 j = sizeof(buf); 415 i = sysctl(qoid, len + 2, buf, &j, 0, 0); 416 if (i) 417 err(1, "sysctl fmt %d %d %d", i, j, errno); 418 419 if (kind) 420 *kind = *(u_int *)buf; 421 422 if (fmt) 423 strcpy(fmt, (char *)(buf + sizeof(u_int))); 424 return 0; 425 } 426 427 #ifdef __i386__ 428 /* 429 * Code to map a bootdev major number into a suitable device name. 430 * Major numbers are mapped into names as in boot2.c 431 */ 432 struct _foo { 433 int majdev; 434 const char *name; 435 } maj2name[] = { 436 { 30, "ad" }, 437 { 0, "wd" }, 438 { 1, "wfd" }, 439 { 2, "fd" }, 440 { 4, "da" }, 441 { -1, NULL } /* terminator */ 442 }; 443 444 static int 445 machdep_bootdev(u_long value) 446 { 447 int majdev, unit, slice, part; 448 struct _foo *p; 449 450 if ((value & B_MAGICMASK) != B_DEVMAGIC) { 451 printf("invalid (0x%08lx)", value); 452 return 0; 453 } 454 majdev = B_TYPE(value); 455 unit = B_UNIT(value); 456 slice = B_SLICE(value); 457 part = B_PARTITION(value); 458 if (majdev == 2) { /* floppy, as known to the boot block... */ 459 printf("/dev/fd%d", unit); 460 return 0; 461 } 462 for (p = maj2name; p->name != NULL && p->majdev != majdev ; p++) ; 463 if (p->name != NULL) { /* found */ 464 if (slice == WHOLE_DISK_SLICE) 465 printf("/dev/%s%d%c", p->name, unit, part); 466 else 467 printf("/dev/%s%ds%d%c", 468 p->name, unit, slice - BASE_SLICE + 1, part + 'a'); 469 } else 470 printf("unknown (major %d unit %d slice %d part %d)", 471 majdev, unit, slice, part); 472 return 0; 473 } 474 #endif 475 476 /* 477 * This formats and outputs the value of one variable 478 * 479 * Returns zero if anything was actually output. 480 * Returns one if didn't know what to do with this. 481 * Return minus one if we had errors. 482 */ 483 484 static int 485 show_var(int *oid, size_t nlen) 486 { 487 u_char buf[BUFSIZ], *val, *p, *nul; 488 char name[BUFSIZ], *fmt; 489 const char *sep, *spacer; 490 int qoid[CTL_MAXNAME+2]; 491 int i; 492 size_t j, len; 493 u_int kind; 494 int (*func)(int, void *); 495 496 qoid[0] = 0; 497 memcpy(qoid + 2, oid, nlen * sizeof(int)); 498 499 qoid[1] = 1; 500 j = sizeof(name); 501 i = sysctl(qoid, nlen + 2, name, &j, 0, 0); 502 if (i || !j) 503 err(1, "sysctl name %d %d %d", i, j, errno); 504 505 if (Nflag) { 506 printf("%s", name); 507 return (0); 508 } 509 510 if (eflag) 511 sep = "="; 512 else 513 sep = ": "; 514 515 if (dflag) { /* just print description */ 516 qoid[1] = 5; 517 j = sizeof(buf); 518 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0); 519 if (!nflag) 520 printf("%s%s", name, sep); 521 printf("%s", buf); 522 return(0); 523 } 524 /* find an estimate of how much we need for this var */ 525 j = 0; 526 i = sysctl(oid, nlen, 0, &j, 0, 0); 527 j += j; /* we want to be sure :-) */ 528 529 val = alloca(j + 1); 530 len = j; 531 i = sysctl(oid, nlen, val, &len, 0, 0); 532 if (i || !len) 533 return (1); 534 535 if (bflag) { 536 fwrite(val, 1, len, stdout); 537 return (0); 538 } 539 540 val[len] = '\0'; 541 fmt = buf; 542 oidfmt(oid, nlen, fmt, &kind); 543 p = val; 544 switch (*fmt) { 545 case 'A': 546 if (!nflag) 547 printf("%s%s", name, sep); 548 nul = memchr(p, '\0', len); 549 fwrite(p, nul == NULL ? len : nul - p, 1, stdout); 550 return (0); 551 552 case 'I': 553 if (!nflag) 554 printf("%s%s", name, sep); 555 fmt++; 556 spacer = ""; 557 while (len >= sizeof(int)) { 558 if(*fmt == 'U') 559 printf("%s%u", spacer, *(unsigned int *)p); 560 else 561 printf("%s%d", spacer, *(int *)p); 562 spacer = " "; 563 len -= sizeof(int); 564 p += sizeof(int); 565 } 566 return (0); 567 568 case 'L': 569 if (!nflag) 570 printf("%s%s", name, sep); 571 fmt++; 572 #ifdef __i386__ 573 if (!strcmp(name, "machdep.guessed_bootdev")) 574 return machdep_bootdev(*(unsigned long *)p); 575 #endif 576 spacer = ""; 577 while (len >= sizeof(long)) { 578 if(*fmt == 'U') 579 printf("%s%lu", spacer, *(unsigned long *)p); 580 else 581 printf("%s%ld", spacer, *(long *)p); 582 spacer = " "; 583 len -= sizeof(long); 584 p += sizeof(long); 585 } 586 return (0); 587 588 case 'P': 589 if (!nflag) 590 printf("%s%s", name, sep); 591 printf("%p", *(void **)p); 592 return (0); 593 594 case 'Q': 595 if (!nflag) 596 printf("%s%s", name, sep); 597 fmt++; 598 spacer = ""; 599 while (len >= sizeof(quad_t)) { 600 if(*fmt == 'U') 601 printf("%s%qu", spacer, *(u_quad_t *)p); 602 else 603 printf("%s%qd", spacer, *(quad_t *)p); 604 spacer = " "; 605 len -= sizeof(int64_t); 606 p += sizeof(int64_t); 607 } 608 return (0); 609 610 case 'T': 611 case 'S': 612 if (!oflag && !xflag) { 613 i = 0; 614 if (strcmp(fmt, "S,clockinfo") == 0) 615 func = S_clockinfo; 616 else if (strcmp(fmt, "S,timespec") == 0) 617 func = S_timespec; 618 else if (strcmp(fmt, "S,timeval") == 0) 619 func = S_timeval; 620 else if (strcmp(fmt, "S,loadavg") == 0) 621 func = S_loadavg; 622 else if (strcmp(fmt, "T,dev_t") == 0) 623 func = T_dev_t; 624 else if (strcmp(fmt, "T,udev_t") == 0) 625 func = T_dev_t; 626 else 627 func = NULL; 628 if (func) { 629 if (!nflag) 630 printf("%s%s", name, sep); 631 return ((*func)(len, p)); 632 } 633 } 634 /* FALL THROUGH */ 635 default: 636 if (!oflag && !xflag) 637 return (1); 638 if (!nflag) 639 printf("%s%s", name, sep); 640 printf("Format:%s Length:%d Dump:0x", fmt, len); 641 while (len-- && (xflag || p < val + 16)) 642 printf("%02x", *p++); 643 if (!xflag && len > 16) 644 printf("..."); 645 return (0); 646 } 647 return (1); 648 } 649 650 static int 651 sysctl_all(int *oid, size_t len) 652 { 653 int name1[22], name2[22]; 654 int retval; 655 size_t i, l1, l2; 656 657 name1[0] = 0; 658 name1[1] = 2; 659 l1 = 2; 660 if (len) { 661 memcpy(name1+2, oid, len * sizeof(int)); 662 l1 += len; 663 } else { 664 name1[2] = 1; 665 l1++; 666 } 667 for (;;) { 668 l2 = sizeof(name2); 669 retval = sysctl(name1, l1, name2, &l2, 0, 0); 670 if (retval < 0) { 671 if (errno == ENOENT) 672 return 0; 673 else 674 err(1, "sysctl(getnext) %d %d", retval, l2); 675 } 676 677 l2 /= sizeof(int); 678 679 if (l2 < len) 680 return 0; 681 682 for (i = 0; i < len; i++) 683 if (name2[i] != oid[i]) 684 return 0; 685 686 retval = show_var(name2, l2); 687 if (retval == 0 && !bflag) 688 putchar('\n'); 689 690 memcpy(name1+2, name2, l2 * sizeof(int)); 691 l1 = 2 + l2; 692 } 693 } 694