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 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)from: sysctl.c 8.1 (Berkeley) 6/6/93"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD: src/sbin/sysctl/sysctl.c,v 1.25.2.11 2003/05/01 22:48:08 trhodes Exp $"; 46 #endif /* not lint */ 47 48 #ifdef __i386__ 49 #include <sys/diskslice.h> /* used for bootdev parsing */ 50 #include <sys/reboot.h> /* used for bootdev parsing */ 51 #endif 52 #include <sys/types.h> 53 #include <sys/stat.h> 54 #include <sys/sysctl.h> 55 #include <sys/resource.h> 56 #include <sys/param.h> 57 58 #include <ctype.h> 59 #include <err.h> 60 #include <errno.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 66 static int aflag, bflag, dflag, eflag, Nflag, nflag, oflag, xflag; 67 68 static int oidfmt(int *, int, char *, u_int *); 69 static void parse(char *); 70 static int show_var(int *, int); 71 static int sysctl_all (int *oid, int len); 72 static int name2oid(char *, int *); 73 74 static void set_T_dev_t (char *, void **, int *); 75 76 static void 77 usage(void) 78 { 79 80 (void)fprintf(stderr, "%s\n%s\n", 81 "usage: sysctl [-bdeNnox] variable[=value] ...", 82 " sysctl [-bdeNnox] -a"); 83 exit(1); 84 } 85 86 int 87 main(int argc, char **argv) 88 { 89 int ch; 90 setbuf(stdout,0); 91 setbuf(stderr,0); 92 93 while ((ch = getopt(argc, argv, "AabdeNnowxX")) != -1) { 94 switch (ch) { 95 case 'A': 96 /* compatibility */ 97 aflag = oflag = 1; 98 break; 99 case 'a': 100 aflag = 1; 101 break; 102 case 'b': 103 bflag = 1; 104 break; 105 case 'd': 106 dflag = 1; 107 break; 108 case 'e': 109 eflag = 1; 110 break; 111 case 'N': 112 Nflag = 1; 113 break; 114 case 'n': 115 nflag = 1; 116 break; 117 case 'o': 118 oflag = 1; 119 break; 120 case 'w': 121 /* compatibility */ 122 /* ignored */ 123 break; 124 case 'X': 125 /* compatibility */ 126 aflag = xflag = 1; 127 break; 128 case 'x': 129 xflag = 1; 130 break; 131 default: 132 usage(); 133 } 134 } 135 argc -= optind; 136 argv += optind; 137 138 if (Nflag && nflag) 139 usage(); 140 if (aflag && argc == 0) 141 exit(sysctl_all(0, 0)); 142 if (argc == 0) 143 usage(); 144 while (argc-- > 0) 145 parse(*argv++); 146 exit(0); 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 void 155 parse(char *string) 156 { 157 int len, i, j; 158 void *newval = 0; 159 int intval; 160 unsigned int uintval; 161 long longval; 162 unsigned long ulongval; 163 size_t newsize = 0; 164 quad_t quadval; 165 int mib[CTL_MAXNAME]; 166 char *cp, *bufp, buf[BUFSIZ], fmt[BUFSIZ]; 167 u_int kind; 168 169 bufp = buf; 170 snprintf(buf, BUFSIZ, "%s", string); 171 if ((cp = strchr(string, '=')) != NULL) { 172 *strchr(buf, '=') = '\0'; 173 *cp++ = '\0'; 174 while (isspace(*cp)) 175 cp++; 176 newval = cp; 177 newsize = strlen(cp); 178 } 179 len = name2oid(bufp, mib); 180 181 if (len < 0) 182 errx(1, "unknown oid '%s'", bufp); 183 184 if (oidfmt(mib, len, fmt, &kind)) 185 err(1, "couldn't find format of oid '%s'", bufp); 186 187 if (newval == NULL) { 188 if ((kind & CTLTYPE) == CTLTYPE_NODE) { 189 sysctl_all(mib, len); 190 } else { 191 i = show_var(mib, len); 192 if (!i && !bflag) 193 putchar('\n'); 194 } 195 } else { 196 if ((kind & CTLTYPE) == CTLTYPE_NODE) 197 errx(1, "oid '%s' isn't a leaf node", bufp); 198 199 if (!(kind&CTLFLAG_WR)) 200 errx(1, "oid '%s' is read only", bufp); 201 202 switch (kind & CTLTYPE) { 203 case CTLTYPE_INT: 204 intval = (int) strtol(newval, NULL, 0); 205 newval = &intval; 206 newsize = sizeof(intval); 207 break; 208 case CTLTYPE_UINT: 209 uintval = (int) strtoul(newval, NULL, 0); 210 newval = &uintval; 211 newsize = sizeof uintval; 212 break; 213 case CTLTYPE_LONG: 214 longval = strtol(newval, NULL, 0); 215 newval = &longval; 216 newsize = sizeof longval; 217 break; 218 case CTLTYPE_ULONG: 219 ulongval = strtoul(newval, NULL, 0); 220 newval = &ulongval; 221 newsize = sizeof ulongval; 222 break; 223 case CTLTYPE_STRING: 224 break; 225 case CTLTYPE_QUAD: 226 sscanf(newval, "%qd", &quadval); 227 newval = &quadval; 228 newsize = sizeof(quadval); 229 break; 230 case CTLTYPE_OPAQUE: 231 if (strcmp(fmt, "T,dev_t") == 0) { 232 set_T_dev_t ((char*)newval, &newval, &newsize); 233 break; 234 } 235 /* FALLTHROUGH */ 236 default: 237 errx(1, "oid '%s' is type %d," 238 " cannot set that", bufp, 239 kind & CTLTYPE); 240 } 241 242 i = show_var(mib, len); 243 if (sysctl(mib, len, 0, 0, newval, newsize) == -1) { 244 if (!i && !bflag) 245 putchar('\n'); 246 switch (errno) { 247 case EOPNOTSUPP: 248 errx(1, "%s: value is not available", 249 string); 250 case ENOTDIR: 251 errx(1, "%s: specification is incomplete", 252 string); 253 case ENOMEM: 254 errx(1, "%s: type is unknown to this program", 255 string); 256 default: 257 warn("%s", string); 258 return; 259 } 260 } 261 if (!bflag) 262 printf(" -> "); 263 i = nflag; 264 nflag = 1; 265 j = show_var(mib, len); 266 if (!j && !bflag) 267 putchar('\n'); 268 nflag = i; 269 } 270 } 271 272 /* These functions will dump out various interesting structures. */ 273 274 static int 275 S_clockinfo(int l2, void *p) 276 { 277 struct clockinfo *ci = (struct clockinfo*)p; 278 if (l2 != sizeof(*ci)) 279 err(1, "S_clockinfo %d != %d", l2, sizeof(*ci)); 280 printf("{ hz = %d, tick = %d, tickadj = %d, profhz = %d, stathz = %d }", 281 ci->hz, ci->tick, ci->tickadj, ci->profhz, ci->stathz); 282 return (0); 283 } 284 285 static int 286 S_loadavg(int l2, void *p) 287 { 288 struct loadavg *tv = (struct loadavg*)p; 289 290 if (l2 != sizeof(*tv)) 291 err(1, "S_loadavg %d != %d", l2, sizeof(*tv)); 292 293 printf("{ %.2f %.2f %.2f }", 294 (double)tv->ldavg[0]/(double)tv->fscale, 295 (double)tv->ldavg[1]/(double)tv->fscale, 296 (double)tv->ldavg[2]/(double)tv->fscale); 297 return (0); 298 } 299 300 static int 301 S_timeval(int l2, void *p) 302 { 303 struct timeval *tv = (struct timeval*)p; 304 time_t tv_sec; 305 char *p1, *p2; 306 307 if (l2 != sizeof(*tv)) 308 err(1, "S_timeval %d != %d", l2, sizeof(*tv)); 309 printf("{ sec = %ld, usec = %ld } ", 310 tv->tv_sec, tv->tv_usec); 311 tv_sec = tv->tv_sec; 312 p1 = strdup(ctime(&tv_sec)); 313 for (p2=p1; *p2 ; p2++) 314 if (*p2 == '\n') 315 *p2 = '\0'; 316 fputs(p1, stdout); 317 return (0); 318 } 319 320 static int 321 T_dev_t(int l2, void *p) 322 { 323 dev_t *d = (dev_t *)p; 324 if (l2 != sizeof(*d)) 325 err(1, "T_dev_T %d != %d", l2, sizeof(*d)); 326 if ((int)(*d) != -1) { 327 if (minor(*d) > 255 || minor(*d) < 0) 328 printf("{ major = %d, minor = 0x%x }", 329 major(*d), minor(*d)); 330 else 331 printf("{ major = %d, minor = %d }", 332 major(*d), minor(*d)); 333 } 334 return (0); 335 } 336 337 static void 338 set_T_dev_t (char *path, void **val, int *size) 339 { 340 static struct stat statb; 341 342 if (strcmp(path, "none") && strcmp(path, "off")) { 343 int rc = stat (path, &statb); 344 if (rc) { 345 err(1, "cannot stat %s", path); 346 } 347 348 if (!S_ISCHR(statb.st_mode)) { 349 errx(1, "must specify a device special file."); 350 } 351 } else { 352 statb.st_rdev = NODEV; 353 } 354 *val = (char*) &statb.st_rdev; 355 *size = sizeof statb.st_rdev; 356 } 357 358 /* 359 * These functions uses a presently undocumented interface to the kernel 360 * to walk the tree and get the type so it can print the value. 361 * This interface is under work and consideration, and should probably 362 * be killed with a big axe by the first person who can find the time. 363 * (be aware though, that the proper interface isn't as obvious as it 364 * may seem, there are various conflicting requirements. 365 */ 366 367 static int 368 name2oid(char *name, int *oidp) 369 { 370 int oid[2]; 371 int i; 372 size_t j; 373 374 oid[0] = 0; 375 oid[1] = 3; 376 377 j = CTL_MAXNAME * sizeof(int); 378 i = sysctl(oid, 2, oidp, &j, name, strlen(name)); 379 if (i < 0) 380 return i; 381 j /= sizeof(int); 382 return (j); 383 } 384 385 static int 386 oidfmt(int *oid, int len, char *fmt, u_int *kind) 387 { 388 int qoid[CTL_MAXNAME+2]; 389 u_char buf[BUFSIZ]; 390 int i; 391 size_t j; 392 393 qoid[0] = 0; 394 qoid[1] = 4; 395 memcpy(qoid + 2, oid, len * sizeof(int)); 396 397 j = sizeof(buf); 398 i = sysctl(qoid, len + 2, buf, &j, 0, 0); 399 if (i) 400 err(1, "sysctl fmt %d %d %d", i, j, errno); 401 402 if (kind) 403 *kind = *(u_int *)buf; 404 405 if (fmt) 406 strcpy(fmt, (char *)(buf + sizeof(u_int))); 407 return 0; 408 } 409 410 #ifdef __i386__ 411 /* 412 * Code to map a bootdev major number into a suitable device name. 413 * Major numbers are mapped into names as in boot2.c 414 */ 415 struct _foo { 416 int majdev; 417 char *name; 418 } maj2name[] = { 419 30, "ad", 420 0, "wd", 421 1, "wfd", 422 2, "fd", 423 4, "da", 424 -1, NULL /* terminator */ 425 }; 426 427 static int 428 machdep_bootdev(u_long value) 429 { 430 int majdev, unit, slice, part; 431 struct _foo *p; 432 433 if (value & B_MAGICMASK != B_DEVMAGIC) { 434 printf("invalid (0x%08x)", value); 435 return 0; 436 } 437 majdev = B_TYPE(value); 438 unit = B_UNIT(value); 439 slice = B_SLICE(value); 440 part = B_PARTITION(value); 441 if (majdev == 2) { /* floppy, as known to the boot block... */ 442 printf("/dev/fd%d", unit); 443 return 0; 444 } 445 for (p = maj2name; p->name != NULL && p->majdev != majdev ; p++) ; 446 if (p->name != NULL) { /* found */ 447 if (slice == WHOLE_DISK_SLICE) 448 printf("/dev/%s%d%c", p->name, unit, part); 449 else 450 printf("/dev/%s%ds%d%c", 451 p->name, unit, slice - BASE_SLICE + 1, part + 'a'); 452 } else 453 printf("unknown (major %d unit %d slice %d part %d)", 454 majdev, unit, slice, part); 455 return 0; 456 } 457 #endif 458 459 /* 460 * This formats and outputs the value of one variable 461 * 462 * Returns zero if anything was actually output. 463 * Returns one if didn't know what to do with this. 464 * Return minus one if we had errors. 465 */ 466 467 static int 468 show_var(int *oid, int nlen) 469 { 470 u_char buf[BUFSIZ], *val, *p; 471 char name[BUFSIZ], *fmt, *sep; 472 int qoid[CTL_MAXNAME+2]; 473 int i; 474 size_t j, len; 475 u_int kind; 476 int (*func)(int, void *); 477 478 qoid[0] = 0; 479 memcpy(qoid + 2, oid, nlen * sizeof(int)); 480 481 qoid[1] = 1; 482 j = sizeof(name); 483 i = sysctl(qoid, nlen + 2, name, &j, 0, 0); 484 if (i || !j) 485 err(1, "sysctl name %d %d %d", i, j, errno); 486 487 if (Nflag) { 488 printf("%s", name); 489 return (0); 490 } 491 492 if (eflag) 493 sep = "="; 494 else 495 sep = ": "; 496 497 if (dflag) { /* just print description */ 498 qoid[1] = 5; 499 j = sizeof(buf); 500 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0); 501 if (!nflag) 502 printf("%s%s", name, sep); 503 printf("%s", buf); 504 return(0); 505 } 506 /* find an estimate of how much we need for this var */ 507 j = 0; 508 i = sysctl(oid, nlen, 0, &j, 0, 0); 509 j += j; /* we want to be sure :-) */ 510 511 val = alloca(j + 1); 512 len = j; 513 i = sysctl(oid, nlen, val, &len, 0, 0); 514 if (i || !len) 515 return (1); 516 517 if (bflag) { 518 fwrite(val, 1, len, stdout); 519 return (0); 520 } 521 522 val[len] = '\0'; 523 fmt = buf; 524 oidfmt(oid, nlen, fmt, &kind); 525 p = val; 526 switch (*fmt) { 527 case 'A': 528 if (!nflag) 529 printf("%s%s", name, sep); 530 printf("%.*s", len, p); 531 return (0); 532 533 case 'I': 534 if (!nflag) 535 printf("%s%s", name, sep); 536 fmt++; 537 val = ""; 538 while (len >= sizeof(int)) { 539 if(*fmt == 'U') 540 printf("%s%u", val, *(unsigned int *)p); 541 else 542 printf("%s%d", val, *(int *)p); 543 val = " "; 544 len -= sizeof(int); 545 p += sizeof(int); 546 } 547 return (0); 548 549 case 'L': 550 if (!nflag) 551 printf("%s%s", name, sep); 552 fmt++; 553 #ifdef __i386__ 554 if (!strcmp(name, "machdep.guessed_bootdev")) 555 return machdep_bootdev(*(unsigned long *)p); 556 #endif 557 val = ""; 558 while (len >= sizeof(long)) { 559 if(*fmt == 'U') 560 printf("%s%lu", val, *(unsigned long *)p); 561 else 562 printf("%s%ld", val, *(long *)p); 563 val = " "; 564 len -= sizeof(long); 565 p += sizeof(long); 566 } 567 return (0); 568 569 case 'P': 570 if (!nflag) 571 printf("%s%s", name, sep); 572 printf("%p", *(void **)p); 573 return (0); 574 575 case 'T': 576 case 'S': 577 i = 0; 578 if (strcmp(fmt, "S,clockinfo") == 0) 579 func = S_clockinfo; 580 else if (strcmp(fmt, "S,timeval") == 0) 581 func = S_timeval; 582 else if (strcmp(fmt, "S,loadavg") == 0) 583 func = S_loadavg; 584 else if (strcmp(fmt, "T,dev_t") == 0) 585 func = T_dev_t; 586 else 587 func = NULL; 588 if (func) { 589 if (!nflag) 590 printf("%s%s", name, sep); 591 return ((*func)(len, p)); 592 } 593 /* FALL THROUGH */ 594 default: 595 if (!oflag && !xflag) 596 return (1); 597 if (!nflag) 598 printf("%s%s", name, sep); 599 printf("Format:%s Length:%d Dump:0x", fmt, len); 600 while (len-- && (xflag || p < val + 16)) 601 printf("%02x", *p++); 602 if (!xflag && len > 16) 603 printf("..."); 604 return (0); 605 } 606 return (1); 607 } 608 609 static int 610 sysctl_all (int *oid, int len) 611 { 612 int name1[22], name2[22]; 613 int i, j; 614 size_t l1, l2; 615 616 name1[0] = 0; 617 name1[1] = 2; 618 l1 = 2; 619 if (len) { 620 memcpy(name1+2, oid, len * sizeof(int)); 621 l1 += len; 622 } else { 623 name1[2] = 1; 624 l1++; 625 } 626 for (;;) { 627 l2 = sizeof(name2); 628 j = sysctl(name1, l1, name2, &l2, 0, 0); 629 if (j < 0) { 630 if (errno == ENOENT) 631 return 0; 632 else 633 err(1, "sysctl(getnext) %d %d", j, l2); 634 } 635 636 l2 /= sizeof(int); 637 638 if (l2 < len) 639 return 0; 640 641 for (i = 0; i < len; i++) 642 if (name2[i] != oid[i]) 643 return 0; 644 645 i = show_var(name2, l2); 646 if (!i && !bflag) 647 putchar('\n'); 648 649 memcpy(name1+2, name2, l2 * sizeof(int)); 650 l1 = 2 + l2; 651 } 652 } 653