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 1.11 2005/01/23 19:41:23 cpressey 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 int mib[CTL_MAXNAME]; 158 char *cp, fmt[BUFSIZ]; 159 const char *name; 160 char *name_allocated = NULL; 161 u_int kind; 162 163 if ((cp = strchr(string, '=')) != NULL) { 164 if ((name_allocated = malloc(cp - string + 1)) == NULL) 165 err(1, "malloc failed"); 166 strlcpy(name_allocated, string, cp - string + 1); 167 name = name_allocated; 168 169 while (isspace(*++cp)) 170 ; 171 172 newval = cp; 173 newsize = strlen(cp); 174 } else { 175 name = string; 176 } 177 178 len = CTL_MAXNAME; 179 if (sysctlnametomib(name, mib, &len) < 0) { 180 if (errno == ENOENT) { 181 errx(1, "unknown oid '%s'", name); 182 } else { 183 err(1, "sysctlnametomib(\"%s\")", name); 184 } 185 } 186 187 if (oidfmt(mib, len, fmt, &kind)) 188 err(1, "couldn't find format of oid '%s'", name); 189 190 if (newval == NULL) { 191 if ((kind & CTLTYPE) == CTLTYPE_NODE) { 192 sysctl_all(mib, len); 193 } else { 194 i = show_var(mib, len); 195 if (!i && !bflag) 196 putchar('\n'); 197 } 198 } else { 199 if ((kind & CTLTYPE) == CTLTYPE_NODE) 200 errx(1, "oid '%s' isn't a leaf node", name); 201 202 if (!(kind&CTLFLAG_WR)) 203 errx(1, "oid '%s' is read only", name); 204 205 switch (kind & CTLTYPE) { 206 case CTLTYPE_INT: 207 intval = (int) strtol(newval, NULL, 0); 208 newval = &intval; 209 newsize = sizeof(intval); 210 break; 211 case CTLTYPE_UINT: 212 uintval = (int) strtoul(newval, NULL, 0); 213 newval = &uintval; 214 newsize = sizeof uintval; 215 break; 216 case CTLTYPE_LONG: 217 longval = strtol(newval, NULL, 0); 218 newval = &longval; 219 newsize = sizeof longval; 220 break; 221 case CTLTYPE_ULONG: 222 ulongval = strtoul(newval, NULL, 0); 223 newval = &ulongval; 224 newsize = sizeof ulongval; 225 break; 226 case CTLTYPE_STRING: 227 break; 228 case CTLTYPE_QUAD: 229 sscanf(newval, "%qd", &quadval); 230 newval = &quadval; 231 newsize = sizeof(quadval); 232 break; 233 case CTLTYPE_OPAQUE: 234 if (strcmp(fmt, "T,dev_t") == 0) { 235 set_T_dev_t ((char*)newval, &newval, &newsize); 236 break; 237 } 238 /* FALLTHROUGH */ 239 default: 240 errx(1, "oid '%s' is type %d," 241 " cannot set that", name, 242 kind & CTLTYPE); 243 } 244 245 i = show_var(mib, len); 246 if (sysctl(mib, len, 0, 0, newval, newsize) == -1) { 247 if (!i && !bflag) 248 putchar('\n'); 249 switch (errno) { 250 case EOPNOTSUPP: 251 errx(1, "%s: value is not available", 252 string); 253 case ENOTDIR: 254 errx(1, "%s: specification is incomplete", 255 string); 256 case ENOMEM: 257 errx(1, "%s: type is unknown to this program", 258 string); 259 default: 260 warn("%s", string); 261 return; 262 } 263 } 264 if (!bflag) 265 printf(" -> "); 266 i = nflag; 267 nflag = 1; 268 j = show_var(mib, len); 269 if (!j && !bflag) 270 putchar('\n'); 271 nflag = i; 272 } 273 274 if (name_allocated != NULL) 275 free(name_allocated); 276 } 277 278 /* These functions will dump out various interesting structures. */ 279 280 static int 281 S_clockinfo(int l2, void *p) 282 { 283 struct clockinfo *ci = (struct clockinfo*)p; 284 if (l2 != sizeof(*ci)) 285 err(1, "S_clockinfo %d != %d", l2, sizeof(*ci)); 286 printf("{ hz = %d, tick = %d, tickadj = %d, profhz = %d, stathz = %d }", 287 ci->hz, ci->tick, ci->tickadj, ci->profhz, ci->stathz); 288 return (0); 289 } 290 291 static int 292 S_loadavg(int l2, void *p) 293 { 294 struct loadavg *tv = (struct loadavg*)p; 295 296 if (l2 != sizeof(*tv)) 297 err(1, "S_loadavg %d != %d", l2, sizeof(*tv)); 298 299 printf("{ %.2f %.2f %.2f }", 300 (double)tv->ldavg[0]/(double)tv->fscale, 301 (double)tv->ldavg[1]/(double)tv->fscale, 302 (double)tv->ldavg[2]/(double)tv->fscale); 303 return (0); 304 } 305 306 static int 307 S_timeval(int l2, void *p) 308 { 309 struct timeval *tv = (struct timeval*)p; 310 time_t tv_sec; 311 char *p1, *p2; 312 313 if (l2 != sizeof(*tv)) 314 err(1, "S_timeval %d != %d", l2, sizeof(*tv)); 315 printf("{ sec = %ld, usec = %ld } ", 316 tv->tv_sec, tv->tv_usec); 317 tv_sec = tv->tv_sec; 318 p1 = strdup(ctime(&tv_sec)); 319 for (p2=p1; *p2 ; p2++) 320 if (*p2 == '\n') 321 *p2 = '\0'; 322 fputs(p1, stdout); 323 return (0); 324 } 325 326 static int 327 T_dev_t(int l2, void *p) 328 { 329 dev_t *d = (dev_t *)p; 330 if (l2 != sizeof(*d)) 331 err(1, "T_dev_T %d != %d", l2, sizeof(*d)); 332 if ((int)(*d) != -1) { 333 if (minor(*d) > 255 || minor(*d) < 0) 334 printf("{ major = %d, minor = 0x%x }", 335 major(*d), minor(*d)); 336 else 337 printf("{ major = %d, minor = %d }", 338 major(*d), minor(*d)); 339 } 340 return (0); 341 } 342 343 static void 344 set_T_dev_t(const char *path, void **val, int *size) 345 { 346 static struct stat statb; 347 348 if (strcmp(path, "none") && strcmp(path, "off")) { 349 int rc = stat (path, &statb); 350 if (rc) { 351 err(1, "cannot stat %s", path); 352 } 353 354 if (!S_ISCHR(statb.st_mode)) { 355 errx(1, "must specify a device special file."); 356 } 357 } else { 358 statb.st_rdev = NODEV; 359 } 360 *val = (char*) &statb.st_rdev; 361 *size = sizeof statb.st_rdev; 362 } 363 364 /* 365 * These functions uses a presently undocumented interface to the kernel 366 * to walk the tree and get the type so it can print the value. 367 * This interface is under work and consideration, and should probably 368 * be killed with a big axe by the first person who can find the time. 369 * (be aware though, that the proper interface isn't as obvious as it 370 * may seem, there are various conflicting requirements. 371 */ 372 373 static int 374 oidfmt(int *oid, size_t len, char *fmt, u_int *kind) 375 { 376 int qoid[CTL_MAXNAME+2]; 377 u_char buf[BUFSIZ]; 378 int i; 379 size_t j; 380 381 qoid[0] = 0; 382 qoid[1] = 4; 383 memcpy(qoid + 2, oid, len * sizeof(int)); 384 385 j = sizeof(buf); 386 i = sysctl(qoid, len + 2, buf, &j, 0, 0); 387 if (i) 388 err(1, "sysctl fmt %d %d %d", i, j, errno); 389 390 if (kind) 391 *kind = *(u_int *)buf; 392 393 if (fmt) 394 strcpy(fmt, (char *)(buf + sizeof(u_int))); 395 return 0; 396 } 397 398 #ifdef __i386__ 399 /* 400 * Code to map a bootdev major number into a suitable device name. 401 * Major numbers are mapped into names as in boot2.c 402 */ 403 struct _foo { 404 int majdev; 405 const char *name; 406 } maj2name[] = { 407 { 30, "ad" }, 408 { 0, "wd" }, 409 { 1, "wfd" }, 410 { 2, "fd" }, 411 { 4, "da" }, 412 { -1, NULL } /* terminator */ 413 }; 414 415 static int 416 machdep_bootdev(u_long value) 417 { 418 int majdev, unit, slice, part; 419 struct _foo *p; 420 421 if ((value & B_MAGICMASK) != B_DEVMAGIC) { 422 printf("invalid (0x%08lx)", value); 423 return 0; 424 } 425 majdev = B_TYPE(value); 426 unit = B_UNIT(value); 427 slice = B_SLICE(value); 428 part = B_PARTITION(value); 429 if (majdev == 2) { /* floppy, as known to the boot block... */ 430 printf("/dev/fd%d", unit); 431 return 0; 432 } 433 for (p = maj2name; p->name != NULL && p->majdev != majdev ; p++) ; 434 if (p->name != NULL) { /* found */ 435 if (slice == WHOLE_DISK_SLICE) 436 printf("/dev/%s%d%c", p->name, unit, part); 437 else 438 printf("/dev/%s%ds%d%c", 439 p->name, unit, slice - BASE_SLICE + 1, part + 'a'); 440 } else 441 printf("unknown (major %d unit %d slice %d part %d)", 442 majdev, unit, slice, part); 443 return 0; 444 } 445 #endif 446 447 /* 448 * This formats and outputs the value of one variable 449 * 450 * Returns zero if anything was actually output. 451 * Returns one if didn't know what to do with this. 452 * Return minus one if we had errors. 453 */ 454 455 static int 456 show_var(int *oid, size_t nlen) 457 { 458 u_char buf[BUFSIZ], *val, *p, *nul; 459 char name[BUFSIZ], *fmt; 460 const char *sep, *spacer; 461 int qoid[CTL_MAXNAME+2]; 462 int i; 463 size_t j, len; 464 u_int kind; 465 int (*func)(int, void *); 466 467 qoid[0] = 0; 468 memcpy(qoid + 2, oid, nlen * sizeof(int)); 469 470 qoid[1] = 1; 471 j = sizeof(name); 472 i = sysctl(qoid, nlen + 2, name, &j, 0, 0); 473 if (i || !j) 474 err(1, "sysctl name %d %d %d", i, j, errno); 475 476 if (Nflag) { 477 printf("%s", name); 478 return (0); 479 } 480 481 if (eflag) 482 sep = "="; 483 else 484 sep = ": "; 485 486 if (dflag) { /* just print description */ 487 qoid[1] = 5; 488 j = sizeof(buf); 489 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0); 490 if (!nflag) 491 printf("%s%s", name, sep); 492 printf("%s", buf); 493 return(0); 494 } 495 /* find an estimate of how much we need for this var */ 496 j = 0; 497 i = sysctl(oid, nlen, 0, &j, 0, 0); 498 j += j; /* we want to be sure :-) */ 499 500 val = alloca(j + 1); 501 len = j; 502 i = sysctl(oid, nlen, val, &len, 0, 0); 503 if (i || !len) 504 return (1); 505 506 if (bflag) { 507 fwrite(val, 1, len, stdout); 508 return (0); 509 } 510 511 val[len] = '\0'; 512 fmt = buf; 513 oidfmt(oid, nlen, fmt, &kind); 514 p = val; 515 switch (*fmt) { 516 case 'A': 517 if (!nflag) 518 printf("%s%s", name, sep); 519 nul = memchr(p, '\0', len); 520 fwrite(p, nul == NULL ? len : nul - p, 1, stdout); 521 return (0); 522 523 case 'I': 524 if (!nflag) 525 printf("%s%s", name, sep); 526 fmt++; 527 spacer = ""; 528 while (len >= sizeof(int)) { 529 if(*fmt == 'U') 530 printf("%s%u", spacer, *(unsigned int *)p); 531 else 532 printf("%s%d", spacer, *(int *)p); 533 spacer = " "; 534 len -= sizeof(int); 535 p += sizeof(int); 536 } 537 return (0); 538 539 case 'L': 540 if (!nflag) 541 printf("%s%s", name, sep); 542 fmt++; 543 #ifdef __i386__ 544 if (!strcmp(name, "machdep.guessed_bootdev")) 545 return machdep_bootdev(*(unsigned long *)p); 546 #endif 547 spacer = ""; 548 while (len >= sizeof(long)) { 549 if(*fmt == 'U') 550 printf("%s%lu", spacer, *(unsigned long *)p); 551 else 552 printf("%s%ld", spacer, *(long *)p); 553 spacer = " "; 554 len -= sizeof(long); 555 p += sizeof(long); 556 } 557 return (0); 558 559 case 'P': 560 if (!nflag) 561 printf("%s%s", name, sep); 562 printf("%p", *(void **)p); 563 return (0); 564 565 case 'Q': 566 if (!nflag) 567 printf("%s%s", name, sep); 568 fmt++; 569 spacer = ""; 570 while (len >= sizeof(int64_t)) { 571 if(*fmt == 'U') 572 printf("%s%"PRIu64, spacer, *(uint64_t *)p); 573 else 574 printf("%s%"PRId64, spacer, *(int64_t *)p); 575 spacer = " "; 576 len -= sizeof(int64_t); 577 p += sizeof(int64_t); 578 } 579 return (0); 580 581 case 'T': 582 case 'S': 583 if (!oflag && !xflag) { 584 i = 0; 585 if (strcmp(fmt, "S,clockinfo") == 0) 586 func = S_clockinfo; 587 else if (strcmp(fmt, "S,timeval") == 0) 588 func = S_timeval; 589 else if (strcmp(fmt, "S,loadavg") == 0) 590 func = S_loadavg; 591 else if (strcmp(fmt, "T,dev_t") == 0) 592 func = T_dev_t; 593 else 594 func = NULL; 595 if (func) { 596 if (!nflag) 597 printf("%s%s", name, sep); 598 return ((*func)(len, p)); 599 } 600 } 601 /* FALL THROUGH */ 602 default: 603 if (!oflag && !xflag) 604 return (1); 605 if (!nflag) 606 printf("%s%s", name, sep); 607 printf("Format:%s Length:%d Dump:0x", fmt, len); 608 while (len-- && (xflag || p < val + 16)) 609 printf("%02x", *p++); 610 if (!xflag && len > 16) 611 printf("..."); 612 return (0); 613 } 614 return (1); 615 } 616 617 static int 618 sysctl_all(int *oid, size_t len) 619 { 620 int name1[22], name2[22]; 621 int retval; 622 size_t i, l1, l2; 623 624 name1[0] = 0; 625 name1[1] = 2; 626 l1 = 2; 627 if (len) { 628 memcpy(name1+2, oid, len * sizeof(int)); 629 l1 += len; 630 } else { 631 name1[2] = 1; 632 l1++; 633 } 634 for (;;) { 635 l2 = sizeof(name2); 636 retval = sysctl(name1, l1, name2, &l2, 0, 0); 637 if (retval < 0) { 638 if (errno == ENOENT) 639 return 0; 640 else 641 err(1, "sysctl(getnext) %d %d", retval, l2); 642 } 643 644 l2 /= sizeof(int); 645 646 if (l2 < len) 647 return 0; 648 649 for (i = 0; i < len; i++) 650 if (name2[i] != oid[i]) 651 return 0; 652 653 retval = show_var(name2, l2); 654 if (retval == 0 && !bflag) 655 putchar('\n'); 656 657 memcpy(name1+2, name2, l2 * sizeof(int)); 658 l1 = 2 + l2; 659 } 660 } 661