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 1.13 2006/09/21 16:16:07 dillon 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_timeval(int l2, void *p) 317 { 318 struct timeval *tv = (struct timeval*)p; 319 time_t tv_sec; 320 char *p1, *p2; 321 322 if (l2 != sizeof(*tv)) 323 err(1, "S_timeval %d != %d", l2, sizeof(*tv)); 324 printf("{ sec = %ld, usec = %ld } ", 325 tv->tv_sec, tv->tv_usec); 326 tv_sec = tv->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 T_dev_t(int l2, void *p) 337 { 338 dev_t *d = (dev_t *)p; 339 if (l2 != sizeof(*d)) 340 err(1, "T_dev_T %d != %d", l2, sizeof(*d)); 341 if ((int)(*d) != -1) { 342 if (minor(*d) > 255 || minor(*d) < 0) 343 printf("{ major = %d, minor = 0x%x }", 344 major(*d), minor(*d)); 345 else 346 printf("{ major = %d, minor = %d }", 347 major(*d), minor(*d)); 348 } 349 return (0); 350 } 351 352 static void 353 set_T_dev_t(const char *path, void **val, int *size) 354 { 355 static struct stat statb; 356 357 if (strcmp(path, "none") && strcmp(path, "off")) { 358 int rc = stat (path, &statb); 359 if (rc) { 360 err(1, "cannot stat %s", path); 361 } 362 363 if (!S_ISCHR(statb.st_mode)) { 364 errx(1, "must specify a device special file."); 365 } 366 } else { 367 statb.st_rdev = NODEV; 368 } 369 *val = (char*) &statb.st_rdev; 370 *size = sizeof statb.st_rdev; 371 } 372 373 /* 374 * These functions uses a presently undocumented interface to the kernel 375 * to walk the tree and get the type so it can print the value. 376 * This interface is under work and consideration, and should probably 377 * be killed with a big axe by the first person who can find the time. 378 * (be aware though, that the proper interface isn't as obvious as it 379 * may seem, there are various conflicting requirements. 380 */ 381 382 static int 383 oidfmt(int *oid, size_t len, char *fmt, u_int *kind) 384 { 385 int qoid[CTL_MAXNAME+2]; 386 u_char buf[BUFSIZ]; 387 int i; 388 size_t j; 389 390 qoid[0] = 0; 391 qoid[1] = 4; 392 memcpy(qoid + 2, oid, len * sizeof(int)); 393 394 j = sizeof(buf); 395 i = sysctl(qoid, len + 2, buf, &j, 0, 0); 396 if (i) 397 err(1, "sysctl fmt %d %d %d", i, j, errno); 398 399 if (kind) 400 *kind = *(u_int *)buf; 401 402 if (fmt) 403 strcpy(fmt, (char *)(buf + sizeof(u_int))); 404 return 0; 405 } 406 407 #ifdef __i386__ 408 /* 409 * Code to map a bootdev major number into a suitable device name. 410 * Major numbers are mapped into names as in boot2.c 411 */ 412 struct _foo { 413 int majdev; 414 const char *name; 415 } maj2name[] = { 416 { 30, "ad" }, 417 { 0, "wd" }, 418 { 1, "wfd" }, 419 { 2, "fd" }, 420 { 4, "da" }, 421 { -1, NULL } /* terminator */ 422 }; 423 424 static int 425 machdep_bootdev(u_long value) 426 { 427 int majdev, unit, slice, part; 428 struct _foo *p; 429 430 if ((value & B_MAGICMASK) != B_DEVMAGIC) { 431 printf("invalid (0x%08lx)", value); 432 return 0; 433 } 434 majdev = B_TYPE(value); 435 unit = B_UNIT(value); 436 slice = B_SLICE(value); 437 part = B_PARTITION(value); 438 if (majdev == 2) { /* floppy, as known to the boot block... */ 439 printf("/dev/fd%d", unit); 440 return 0; 441 } 442 for (p = maj2name; p->name != NULL && p->majdev != majdev ; p++) ; 443 if (p->name != NULL) { /* found */ 444 if (slice == WHOLE_DISK_SLICE) 445 printf("/dev/%s%d%c", p->name, unit, part); 446 else 447 printf("/dev/%s%ds%d%c", 448 p->name, unit, slice - BASE_SLICE + 1, part + 'a'); 449 } else 450 printf("unknown (major %d unit %d slice %d part %d)", 451 majdev, unit, slice, part); 452 return 0; 453 } 454 #endif 455 456 /* 457 * This formats and outputs the value of one variable 458 * 459 * Returns zero if anything was actually output. 460 * Returns one if didn't know what to do with this. 461 * Return minus one if we had errors. 462 */ 463 464 static int 465 show_var(int *oid, size_t nlen) 466 { 467 u_char buf[BUFSIZ], *val, *p, *nul; 468 char name[BUFSIZ], *fmt; 469 const char *sep, *spacer; 470 int qoid[CTL_MAXNAME+2]; 471 int i; 472 size_t j, len; 473 u_int kind; 474 int (*func)(int, void *); 475 476 qoid[0] = 0; 477 memcpy(qoid + 2, oid, nlen * sizeof(int)); 478 479 qoid[1] = 1; 480 j = sizeof(name); 481 i = sysctl(qoid, nlen + 2, name, &j, 0, 0); 482 if (i || !j) 483 err(1, "sysctl name %d %d %d", i, j, errno); 484 485 if (Nflag) { 486 printf("%s", name); 487 return (0); 488 } 489 490 if (eflag) 491 sep = "="; 492 else 493 sep = ": "; 494 495 if (dflag) { /* just print description */ 496 qoid[1] = 5; 497 j = sizeof(buf); 498 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0); 499 if (!nflag) 500 printf("%s%s", name, sep); 501 printf("%s", buf); 502 return(0); 503 } 504 /* find an estimate of how much we need for this var */ 505 j = 0; 506 i = sysctl(oid, nlen, 0, &j, 0, 0); 507 j += j; /* we want to be sure :-) */ 508 509 val = alloca(j + 1); 510 len = j; 511 i = sysctl(oid, nlen, val, &len, 0, 0); 512 if (i || !len) 513 return (1); 514 515 if (bflag) { 516 fwrite(val, 1, len, stdout); 517 return (0); 518 } 519 520 val[len] = '\0'; 521 fmt = buf; 522 oidfmt(oid, nlen, fmt, &kind); 523 p = val; 524 switch (*fmt) { 525 case 'A': 526 if (!nflag) 527 printf("%s%s", name, sep); 528 nul = memchr(p, '\0', len); 529 fwrite(p, nul == NULL ? len : nul - p, 1, stdout); 530 return (0); 531 532 case 'I': 533 if (!nflag) 534 printf("%s%s", name, sep); 535 fmt++; 536 spacer = ""; 537 while (len >= sizeof(int)) { 538 if(*fmt == 'U') 539 printf("%s%u", spacer, *(unsigned int *)p); 540 else 541 printf("%s%d", spacer, *(int *)p); 542 spacer = " "; 543 len -= sizeof(int); 544 p += sizeof(int); 545 } 546 return (0); 547 548 case 'L': 549 if (!nflag) 550 printf("%s%s", name, sep); 551 fmt++; 552 #ifdef __i386__ 553 if (!strcmp(name, "machdep.guessed_bootdev")) 554 return machdep_bootdev(*(unsigned long *)p); 555 #endif 556 spacer = ""; 557 while (len >= sizeof(long)) { 558 if(*fmt == 'U') 559 printf("%s%lu", spacer, *(unsigned long *)p); 560 else 561 printf("%s%ld", spacer, *(long *)p); 562 spacer = " "; 563 len -= sizeof(long); 564 p += sizeof(long); 565 } 566 return (0); 567 568 case 'P': 569 if (!nflag) 570 printf("%s%s", name, sep); 571 printf("%p", *(void **)p); 572 return (0); 573 574 case 'Q': 575 if (!nflag) 576 printf("%s%s", name, sep); 577 fmt++; 578 spacer = ""; 579 while (len >= sizeof(quad_t)) { 580 if(*fmt == 'U') 581 printf("%s%qu", spacer, *(u_quad_t *)p); 582 else 583 printf("%s%qd", spacer, *(quad_t *)p); 584 spacer = " "; 585 len -= sizeof(int64_t); 586 p += sizeof(int64_t); 587 } 588 return (0); 589 590 case 'T': 591 case 'S': 592 if (!oflag && !xflag) { 593 i = 0; 594 if (strcmp(fmt, "S,clockinfo") == 0) 595 func = S_clockinfo; 596 else if (strcmp(fmt, "S,timeval") == 0) 597 func = S_timeval; 598 else if (strcmp(fmt, "S,loadavg") == 0) 599 func = S_loadavg; 600 else if (strcmp(fmt, "T,dev_t") == 0) 601 func = T_dev_t; 602 else if (strcmp(fmt, "T,udev_t") == 0) 603 func = T_dev_t; 604 else 605 func = NULL; 606 if (func) { 607 if (!nflag) 608 printf("%s%s", name, sep); 609 return ((*func)(len, p)); 610 } 611 } 612 /* FALL THROUGH */ 613 default: 614 if (!oflag && !xflag) 615 return (1); 616 if (!nflag) 617 printf("%s%s", name, sep); 618 printf("Format:%s Length:%d Dump:0x", fmt, len); 619 while (len-- && (xflag || p < val + 16)) 620 printf("%02x", *p++); 621 if (!xflag && len > 16) 622 printf("..."); 623 return (0); 624 } 625 return (1); 626 } 627 628 static int 629 sysctl_all(int *oid, size_t len) 630 { 631 int name1[22], name2[22]; 632 int retval; 633 size_t i, l1, l2; 634 635 name1[0] = 0; 636 name1[1] = 2; 637 l1 = 2; 638 if (len) { 639 memcpy(name1+2, oid, len * sizeof(int)); 640 l1 += len; 641 } else { 642 name1[2] = 1; 643 l1++; 644 } 645 for (;;) { 646 l2 = sizeof(name2); 647 retval = sysctl(name1, l1, name2, &l2, 0, 0); 648 if (retval < 0) { 649 if (errno == ENOENT) 650 return 0; 651 else 652 err(1, "sysctl(getnext) %d %d", retval, l2); 653 } 654 655 l2 /= sizeof(int); 656 657 if (l2 < len) 658 return 0; 659 660 for (i = 0; i < len; i++) 661 if (name2[i] != oid[i]) 662 return 0; 663 664 retval = show_var(name2, l2); 665 if (retval == 0 && !bflag) 666 putchar('\n'); 667 668 memcpy(name1+2, name2, l2 * sizeof(int)); 669 l1 = 2 + l2; 670 } 671 } 672