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 1.12 2005/04/23 19:57:35 joerg 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 set_T_dev_t ((char*)newval, &newval, &newsize); 242 break; 243 } 244 /* FALLTHROUGH */ 245 default: 246 errx(1, "oid '%s' is type %d," 247 " cannot set that", name, 248 kind & CTLTYPE); 249 } 250 251 i = show_var(mib, len); 252 if (sysctl(mib, len, 0, 0, newval, newsize) == -1) { 253 if (!i && !bflag) 254 putchar('\n'); 255 switch (errno) { 256 case EOPNOTSUPP: 257 errx(1, "%s: value is not available", 258 string); 259 case ENOTDIR: 260 errx(1, "%s: specification is incomplete", 261 string); 262 case ENOMEM: 263 errx(1, "%s: type is unknown to this program", 264 string); 265 default: 266 warn("%s", string); 267 return; 268 } 269 } 270 if (!bflag) 271 printf(" -> "); 272 i = nflag; 273 nflag = 1; 274 j = show_var(mib, len); 275 if (!j && !bflag) 276 putchar('\n'); 277 nflag = i; 278 } 279 280 if (name_allocated != NULL) 281 free(name_allocated); 282 } 283 284 /* These functions will dump out various interesting structures. */ 285 286 static int 287 S_clockinfo(int l2, void *p) 288 { 289 struct clockinfo *ci = (struct clockinfo*)p; 290 if (l2 != sizeof(*ci)) 291 err(1, "S_clockinfo %d != %d", l2, sizeof(*ci)); 292 printf("{ hz = %d, tick = %d, tickadj = %d, profhz = %d, stathz = %d }", 293 ci->hz, ci->tick, ci->tickadj, ci->profhz, ci->stathz); 294 return (0); 295 } 296 297 static int 298 S_loadavg(int l2, void *p) 299 { 300 struct loadavg *tv = (struct loadavg*)p; 301 302 if (l2 != sizeof(*tv)) 303 err(1, "S_loadavg %d != %d", l2, sizeof(*tv)); 304 305 printf("{ %.2f %.2f %.2f }", 306 (double)tv->ldavg[0]/(double)tv->fscale, 307 (double)tv->ldavg[1]/(double)tv->fscale, 308 (double)tv->ldavg[2]/(double)tv->fscale); 309 return (0); 310 } 311 312 static int 313 S_timeval(int l2, void *p) 314 { 315 struct timeval *tv = (struct timeval*)p; 316 time_t tv_sec; 317 char *p1, *p2; 318 319 if (l2 != sizeof(*tv)) 320 err(1, "S_timeval %d != %d", l2, sizeof(*tv)); 321 printf("{ sec = %ld, usec = %ld } ", 322 tv->tv_sec, tv->tv_usec); 323 tv_sec = tv->tv_sec; 324 p1 = strdup(ctime(&tv_sec)); 325 for (p2=p1; *p2 ; p2++) 326 if (*p2 == '\n') 327 *p2 = '\0'; 328 fputs(p1, stdout); 329 return (0); 330 } 331 332 static int 333 T_dev_t(int l2, void *p) 334 { 335 dev_t *d = (dev_t *)p; 336 if (l2 != sizeof(*d)) 337 err(1, "T_dev_T %d != %d", l2, sizeof(*d)); 338 if ((int)(*d) != -1) { 339 if (minor(*d) > 255 || minor(*d) < 0) 340 printf("{ major = %d, minor = 0x%x }", 341 major(*d), minor(*d)); 342 else 343 printf("{ major = %d, minor = %d }", 344 major(*d), minor(*d)); 345 } 346 return (0); 347 } 348 349 static void 350 set_T_dev_t(const char *path, void **val, int *size) 351 { 352 static struct stat statb; 353 354 if (strcmp(path, "none") && strcmp(path, "off")) { 355 int rc = stat (path, &statb); 356 if (rc) { 357 err(1, "cannot stat %s", path); 358 } 359 360 if (!S_ISCHR(statb.st_mode)) { 361 errx(1, "must specify a device special file."); 362 } 363 } else { 364 statb.st_rdev = NODEV; 365 } 366 *val = (char*) &statb.st_rdev; 367 *size = sizeof statb.st_rdev; 368 } 369 370 /* 371 * These functions uses a presently undocumented interface to the kernel 372 * to walk the tree and get the type so it can print the value. 373 * This interface is under work and consideration, and should probably 374 * be killed with a big axe by the first person who can find the time. 375 * (be aware though, that the proper interface isn't as obvious as it 376 * may seem, there are various conflicting requirements. 377 */ 378 379 static int 380 oidfmt(int *oid, size_t len, char *fmt, u_int *kind) 381 { 382 int qoid[CTL_MAXNAME+2]; 383 u_char buf[BUFSIZ]; 384 int i; 385 size_t j; 386 387 qoid[0] = 0; 388 qoid[1] = 4; 389 memcpy(qoid + 2, oid, len * sizeof(int)); 390 391 j = sizeof(buf); 392 i = sysctl(qoid, len + 2, buf, &j, 0, 0); 393 if (i) 394 err(1, "sysctl fmt %d %d %d", i, j, errno); 395 396 if (kind) 397 *kind = *(u_int *)buf; 398 399 if (fmt) 400 strcpy(fmt, (char *)(buf + sizeof(u_int))); 401 return 0; 402 } 403 404 #ifdef __i386__ 405 /* 406 * Code to map a bootdev major number into a suitable device name. 407 * Major numbers are mapped into names as in boot2.c 408 */ 409 struct _foo { 410 int majdev; 411 const char *name; 412 } maj2name[] = { 413 { 30, "ad" }, 414 { 0, "wd" }, 415 { 1, "wfd" }, 416 { 2, "fd" }, 417 { 4, "da" }, 418 { -1, NULL } /* terminator */ 419 }; 420 421 static int 422 machdep_bootdev(u_long value) 423 { 424 int majdev, unit, slice, part; 425 struct _foo *p; 426 427 if ((value & B_MAGICMASK) != B_DEVMAGIC) { 428 printf("invalid (0x%08lx)", value); 429 return 0; 430 } 431 majdev = B_TYPE(value); 432 unit = B_UNIT(value); 433 slice = B_SLICE(value); 434 part = B_PARTITION(value); 435 if (majdev == 2) { /* floppy, as known to the boot block... */ 436 printf("/dev/fd%d", unit); 437 return 0; 438 } 439 for (p = maj2name; p->name != NULL && p->majdev != majdev ; p++) ; 440 if (p->name != NULL) { /* found */ 441 if (slice == WHOLE_DISK_SLICE) 442 printf("/dev/%s%d%c", p->name, unit, part); 443 else 444 printf("/dev/%s%ds%d%c", 445 p->name, unit, slice - BASE_SLICE + 1, part + 'a'); 446 } else 447 printf("unknown (major %d unit %d slice %d part %d)", 448 majdev, unit, slice, part); 449 return 0; 450 } 451 #endif 452 453 /* 454 * This formats and outputs the value of one variable 455 * 456 * Returns zero if anything was actually output. 457 * Returns one if didn't know what to do with this. 458 * Return minus one if we had errors. 459 */ 460 461 static int 462 show_var(int *oid, size_t nlen) 463 { 464 u_char buf[BUFSIZ], *val, *p, *nul; 465 char name[BUFSIZ], *fmt; 466 const char *sep, *spacer; 467 int qoid[CTL_MAXNAME+2]; 468 int i; 469 size_t j, len; 470 u_int kind; 471 int (*func)(int, void *); 472 473 qoid[0] = 0; 474 memcpy(qoid + 2, oid, nlen * sizeof(int)); 475 476 qoid[1] = 1; 477 j = sizeof(name); 478 i = sysctl(qoid, nlen + 2, name, &j, 0, 0); 479 if (i || !j) 480 err(1, "sysctl name %d %d %d", i, j, errno); 481 482 if (Nflag) { 483 printf("%s", name); 484 return (0); 485 } 486 487 if (eflag) 488 sep = "="; 489 else 490 sep = ": "; 491 492 if (dflag) { /* just print description */ 493 qoid[1] = 5; 494 j = sizeof(buf); 495 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0); 496 if (!nflag) 497 printf("%s%s", name, sep); 498 printf("%s", buf); 499 return(0); 500 } 501 /* find an estimate of how much we need for this var */ 502 j = 0; 503 i = sysctl(oid, nlen, 0, &j, 0, 0); 504 j += j; /* we want to be sure :-) */ 505 506 val = alloca(j + 1); 507 len = j; 508 i = sysctl(oid, nlen, val, &len, 0, 0); 509 if (i || !len) 510 return (1); 511 512 if (bflag) { 513 fwrite(val, 1, len, stdout); 514 return (0); 515 } 516 517 val[len] = '\0'; 518 fmt = buf; 519 oidfmt(oid, nlen, fmt, &kind); 520 p = val; 521 switch (*fmt) { 522 case 'A': 523 if (!nflag) 524 printf("%s%s", name, sep); 525 nul = memchr(p, '\0', len); 526 fwrite(p, nul == NULL ? len : nul - p, 1, stdout); 527 return (0); 528 529 case 'I': 530 if (!nflag) 531 printf("%s%s", name, sep); 532 fmt++; 533 spacer = ""; 534 while (len >= sizeof(int)) { 535 if(*fmt == 'U') 536 printf("%s%u", spacer, *(unsigned int *)p); 537 else 538 printf("%s%d", spacer, *(int *)p); 539 spacer = " "; 540 len -= sizeof(int); 541 p += sizeof(int); 542 } 543 return (0); 544 545 case 'L': 546 if (!nflag) 547 printf("%s%s", name, sep); 548 fmt++; 549 #ifdef __i386__ 550 if (!strcmp(name, "machdep.guessed_bootdev")) 551 return machdep_bootdev(*(unsigned long *)p); 552 #endif 553 spacer = ""; 554 while (len >= sizeof(long)) { 555 if(*fmt == 'U') 556 printf("%s%lu", spacer, *(unsigned long *)p); 557 else 558 printf("%s%ld", spacer, *(long *)p); 559 spacer = " "; 560 len -= sizeof(long); 561 p += sizeof(long); 562 } 563 return (0); 564 565 case 'P': 566 if (!nflag) 567 printf("%s%s", name, sep); 568 printf("%p", *(void **)p); 569 return (0); 570 571 case 'Q': 572 if (!nflag) 573 printf("%s%s", name, sep); 574 fmt++; 575 spacer = ""; 576 while (len >= sizeof(quad_t)) { 577 if(*fmt == 'U') 578 printf("%s%qu", spacer, *(u_quad_t *)p); 579 else 580 printf("%s%qd", spacer, *(quad_t *)p); 581 spacer = " "; 582 len -= sizeof(int64_t); 583 p += sizeof(int64_t); 584 } 585 return (0); 586 587 case 'T': 588 case 'S': 589 if (!oflag && !xflag) { 590 i = 0; 591 if (strcmp(fmt, "S,clockinfo") == 0) 592 func = S_clockinfo; 593 else if (strcmp(fmt, "S,timeval") == 0) 594 func = S_timeval; 595 else if (strcmp(fmt, "S,loadavg") == 0) 596 func = S_loadavg; 597 else if (strcmp(fmt, "T,dev_t") == 0) 598 func = T_dev_t; 599 else 600 func = NULL; 601 if (func) { 602 if (!nflag) 603 printf("%s%s", name, sep); 604 return ((*func)(len, p)); 605 } 606 } 607 /* FALL THROUGH */ 608 default: 609 if (!oflag && !xflag) 610 return (1); 611 if (!nflag) 612 printf("%s%s", name, sep); 613 printf("Format:%s Length:%d Dump:0x", fmt, len); 614 while (len-- && (xflag || p < val + 16)) 615 printf("%02x", *p++); 616 if (!xflag && len > 16) 617 printf("..."); 618 return (0); 619 } 620 return (1); 621 } 622 623 static int 624 sysctl_all(int *oid, size_t len) 625 { 626 int name1[22], name2[22]; 627 int retval; 628 size_t i, l1, l2; 629 630 name1[0] = 0; 631 name1[1] = 2; 632 l1 = 2; 633 if (len) { 634 memcpy(name1+2, oid, len * sizeof(int)); 635 l1 += len; 636 } else { 637 name1[2] = 1; 638 l1++; 639 } 640 for (;;) { 641 l2 = sizeof(name2); 642 retval = sysctl(name1, l1, name2, &l2, 0, 0); 643 if (retval < 0) { 644 if (errno == ENOENT) 645 return 0; 646 else 647 err(1, "sysctl(getnext) %d %d", retval, l2); 648 } 649 650 l2 /= sizeof(int); 651 652 if (l2 < len) 653 return 0; 654 655 for (i = 0; i < len; i++) 656 if (name2[i] != oid[i]) 657 return 0; 658 659 retval = show_var(name2, l2); 660 if (retval == 0 && !bflag) 661 putchar('\n'); 662 663 memcpy(name1+2, name2, l2 * sizeof(int)); 664 l1 = 2 + l2; 665 } 666 } 667