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 1.2 2003/06/17 04:27:34 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 <ctype.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 static int aflag, bflag, dflag, eflag, Nflag, nflag, oflag, xflag; 58 59 static int oidfmt(int *, int, char *, u_int *); 60 static void parse(char *); 61 static int show_var(int *, int); 62 static int sysctl_all (int *oid, int len); 63 static int name2oid(char *, int *); 64 65 static void set_T_dev_t (char *, void **, int *); 66 67 static void 68 usage(void) 69 { 70 71 (void)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(char *string) 147 { 148 int len, i, j; 149 void *newval = 0; 150 int intval; 151 unsigned int uintval; 152 long longval; 153 unsigned long ulongval; 154 size_t newsize = 0; 155 quad_t quadval; 156 int mib[CTL_MAXNAME]; 157 char *cp, *bufp, buf[BUFSIZ], fmt[BUFSIZ]; 158 u_int kind; 159 160 bufp = buf; 161 snprintf(buf, BUFSIZ, "%s", string); 162 if ((cp = strchr(string, '=')) != NULL) { 163 *strchr(buf, '=') = '\0'; 164 *cp++ = '\0'; 165 while (isspace(*cp)) 166 cp++; 167 newval = cp; 168 newsize = strlen(cp); 169 } 170 len = name2oid(bufp, mib); 171 172 if (len < 0) 173 errx(1, "unknown oid '%s'", bufp); 174 175 if (oidfmt(mib, len, fmt, &kind)) 176 err(1, "couldn't find format of oid '%s'", bufp); 177 178 if (newval == NULL) { 179 if ((kind & CTLTYPE) == CTLTYPE_NODE) { 180 sysctl_all(mib, len); 181 } else { 182 i = show_var(mib, len); 183 if (!i && !bflag) 184 putchar('\n'); 185 } 186 } else { 187 if ((kind & CTLTYPE) == CTLTYPE_NODE) 188 errx(1, "oid '%s' isn't a leaf node", bufp); 189 190 if (!(kind&CTLFLAG_WR)) 191 errx(1, "oid '%s' is read only", bufp); 192 193 switch (kind & CTLTYPE) { 194 case CTLTYPE_INT: 195 intval = (int) strtol(newval, NULL, 0); 196 newval = &intval; 197 newsize = sizeof(intval); 198 break; 199 case CTLTYPE_UINT: 200 uintval = (int) strtoul(newval, NULL, 0); 201 newval = &uintval; 202 newsize = sizeof uintval; 203 break; 204 case CTLTYPE_LONG: 205 longval = strtol(newval, NULL, 0); 206 newval = &longval; 207 newsize = sizeof longval; 208 break; 209 case CTLTYPE_ULONG: 210 ulongval = strtoul(newval, NULL, 0); 211 newval = &ulongval; 212 newsize = sizeof ulongval; 213 break; 214 case CTLTYPE_STRING: 215 break; 216 case CTLTYPE_QUAD: 217 sscanf(newval, "%qd", &quadval); 218 newval = &quadval; 219 newsize = sizeof(quadval); 220 break; 221 case CTLTYPE_OPAQUE: 222 if (strcmp(fmt, "T,dev_t") == 0) { 223 set_T_dev_t ((char*)newval, &newval, &newsize); 224 break; 225 } 226 /* FALLTHROUGH */ 227 default: 228 errx(1, "oid '%s' is type %d," 229 " cannot set that", bufp, 230 kind & CTLTYPE); 231 } 232 233 i = show_var(mib, len); 234 if (sysctl(mib, len, 0, 0, newval, newsize) == -1) { 235 if (!i && !bflag) 236 putchar('\n'); 237 switch (errno) { 238 case EOPNOTSUPP: 239 errx(1, "%s: value is not available", 240 string); 241 case ENOTDIR: 242 errx(1, "%s: specification is incomplete", 243 string); 244 case ENOMEM: 245 errx(1, "%s: type is unknown to this program", 246 string); 247 default: 248 warn("%s", string); 249 return; 250 } 251 } 252 if (!bflag) 253 printf(" -> "); 254 i = nflag; 255 nflag = 1; 256 j = show_var(mib, len); 257 if (!j && !bflag) 258 putchar('\n'); 259 nflag = i; 260 } 261 } 262 263 /* These functions will dump out various interesting structures. */ 264 265 static int 266 S_clockinfo(int l2, void *p) 267 { 268 struct clockinfo *ci = (struct clockinfo*)p; 269 if (l2 != sizeof(*ci)) 270 err(1, "S_clockinfo %d != %d", l2, sizeof(*ci)); 271 printf("{ hz = %d, tick = %d, tickadj = %d, profhz = %d, stathz = %d }", 272 ci->hz, ci->tick, ci->tickadj, ci->profhz, ci->stathz); 273 return (0); 274 } 275 276 static int 277 S_loadavg(int l2, void *p) 278 { 279 struct loadavg *tv = (struct loadavg*)p; 280 281 if (l2 != sizeof(*tv)) 282 err(1, "S_loadavg %d != %d", l2, sizeof(*tv)); 283 284 printf("{ %.2f %.2f %.2f }", 285 (double)tv->ldavg[0]/(double)tv->fscale, 286 (double)tv->ldavg[1]/(double)tv->fscale, 287 (double)tv->ldavg[2]/(double)tv->fscale); 288 return (0); 289 } 290 291 static int 292 S_timeval(int l2, void *p) 293 { 294 struct timeval *tv = (struct timeval*)p; 295 time_t tv_sec; 296 char *p1, *p2; 297 298 if (l2 != sizeof(*tv)) 299 err(1, "S_timeval %d != %d", l2, sizeof(*tv)); 300 printf("{ sec = %ld, usec = %ld } ", 301 tv->tv_sec, tv->tv_usec); 302 tv_sec = tv->tv_sec; 303 p1 = strdup(ctime(&tv_sec)); 304 for (p2=p1; *p2 ; p2++) 305 if (*p2 == '\n') 306 *p2 = '\0'; 307 fputs(p1, stdout); 308 return (0); 309 } 310 311 static int 312 T_dev_t(int l2, void *p) 313 { 314 dev_t *d = (dev_t *)p; 315 if (l2 != sizeof(*d)) 316 err(1, "T_dev_T %d != %d", l2, sizeof(*d)); 317 if ((int)(*d) != -1) { 318 if (minor(*d) > 255 || minor(*d) < 0) 319 printf("{ major = %d, minor = 0x%x }", 320 major(*d), minor(*d)); 321 else 322 printf("{ major = %d, minor = %d }", 323 major(*d), minor(*d)); 324 } 325 return (0); 326 } 327 328 static void 329 set_T_dev_t (char *path, void **val, int *size) 330 { 331 static struct stat statb; 332 333 if (strcmp(path, "none") && strcmp(path, "off")) { 334 int rc = stat (path, &statb); 335 if (rc) { 336 err(1, "cannot stat %s", path); 337 } 338 339 if (!S_ISCHR(statb.st_mode)) { 340 errx(1, "must specify a device special file."); 341 } 342 } else { 343 statb.st_rdev = NODEV; 344 } 345 *val = (char*) &statb.st_rdev; 346 *size = sizeof statb.st_rdev; 347 } 348 349 /* 350 * These functions uses a presently undocumented interface to the kernel 351 * to walk the tree and get the type so it can print the value. 352 * This interface is under work and consideration, and should probably 353 * be killed with a big axe by the first person who can find the time. 354 * (be aware though, that the proper interface isn't as obvious as it 355 * may seem, there are various conflicting requirements. 356 */ 357 358 static int 359 name2oid(char *name, int *oidp) 360 { 361 int oid[2]; 362 int i; 363 size_t j; 364 365 oid[0] = 0; 366 oid[1] = 3; 367 368 j = CTL_MAXNAME * sizeof(int); 369 i = sysctl(oid, 2, oidp, &j, name, strlen(name)); 370 if (i < 0) 371 return i; 372 j /= sizeof(int); 373 return (j); 374 } 375 376 static int 377 oidfmt(int *oid, int len, char *fmt, u_int *kind) 378 { 379 int qoid[CTL_MAXNAME+2]; 380 u_char buf[BUFSIZ]; 381 int i; 382 size_t j; 383 384 qoid[0] = 0; 385 qoid[1] = 4; 386 memcpy(qoid + 2, oid, len * sizeof(int)); 387 388 j = sizeof(buf); 389 i = sysctl(qoid, len + 2, buf, &j, 0, 0); 390 if (i) 391 err(1, "sysctl fmt %d %d %d", i, j, errno); 392 393 if (kind) 394 *kind = *(u_int *)buf; 395 396 if (fmt) 397 strcpy(fmt, (char *)(buf + sizeof(u_int))); 398 return 0; 399 } 400 401 #ifdef __i386__ 402 /* 403 * Code to map a bootdev major number into a suitable device name. 404 * Major numbers are mapped into names as in boot2.c 405 */ 406 struct _foo { 407 int majdev; 408 char *name; 409 } maj2name[] = { 410 30, "ad", 411 0, "wd", 412 1, "wfd", 413 2, "fd", 414 4, "da", 415 -1, NULL /* terminator */ 416 }; 417 418 static int 419 machdep_bootdev(u_long value) 420 { 421 int majdev, unit, slice, part; 422 struct _foo *p; 423 424 if (value & B_MAGICMASK != B_DEVMAGIC) { 425 printf("invalid (0x%08x)", value); 426 return 0; 427 } 428 majdev = B_TYPE(value); 429 unit = B_UNIT(value); 430 slice = B_SLICE(value); 431 part = B_PARTITION(value); 432 if (majdev == 2) { /* floppy, as known to the boot block... */ 433 printf("/dev/fd%d", unit); 434 return 0; 435 } 436 for (p = maj2name; p->name != NULL && p->majdev != majdev ; p++) ; 437 if (p->name != NULL) { /* found */ 438 if (slice == WHOLE_DISK_SLICE) 439 printf("/dev/%s%d%c", p->name, unit, part); 440 else 441 printf("/dev/%s%ds%d%c", 442 p->name, unit, slice - BASE_SLICE + 1, part + 'a'); 443 } else 444 printf("unknown (major %d unit %d slice %d part %d)", 445 majdev, unit, slice, part); 446 return 0; 447 } 448 #endif 449 450 /* 451 * This formats and outputs the value of one variable 452 * 453 * Returns zero if anything was actually output. 454 * Returns one if didn't know what to do with this. 455 * Return minus one if we had errors. 456 */ 457 458 static int 459 show_var(int *oid, int nlen) 460 { 461 u_char buf[BUFSIZ], *val, *p; 462 char name[BUFSIZ], *fmt, *sep; 463 int qoid[CTL_MAXNAME+2]; 464 int i; 465 size_t j, len; 466 u_int kind; 467 int (*func)(int, void *); 468 469 qoid[0] = 0; 470 memcpy(qoid + 2, oid, nlen * sizeof(int)); 471 472 qoid[1] = 1; 473 j = sizeof(name); 474 i = sysctl(qoid, nlen + 2, name, &j, 0, 0); 475 if (i || !j) 476 err(1, "sysctl name %d %d %d", i, j, errno); 477 478 if (Nflag) { 479 printf("%s", name); 480 return (0); 481 } 482 483 if (eflag) 484 sep = "="; 485 else 486 sep = ": "; 487 488 if (dflag) { /* just print description */ 489 qoid[1] = 5; 490 j = sizeof(buf); 491 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0); 492 if (!nflag) 493 printf("%s%s", name, sep); 494 printf("%s", buf); 495 return(0); 496 } 497 /* find an estimate of how much we need for this var */ 498 j = 0; 499 i = sysctl(oid, nlen, 0, &j, 0, 0); 500 j += j; /* we want to be sure :-) */ 501 502 val = alloca(j + 1); 503 len = j; 504 i = sysctl(oid, nlen, val, &len, 0, 0); 505 if (i || !len) 506 return (1); 507 508 if (bflag) { 509 fwrite(val, 1, len, stdout); 510 return (0); 511 } 512 513 val[len] = '\0'; 514 fmt = buf; 515 oidfmt(oid, nlen, fmt, &kind); 516 p = val; 517 switch (*fmt) { 518 case 'A': 519 if (!nflag) 520 printf("%s%s", name, sep); 521 printf("%.*s", len, p); 522 return (0); 523 524 case 'I': 525 if (!nflag) 526 printf("%s%s", name, sep); 527 fmt++; 528 val = ""; 529 while (len >= sizeof(int)) { 530 if(*fmt == 'U') 531 printf("%s%u", val, *(unsigned int *)p); 532 else 533 printf("%s%d", val, *(int *)p); 534 val = " "; 535 len -= sizeof(int); 536 p += sizeof(int); 537 } 538 return (0); 539 540 case 'L': 541 if (!nflag) 542 printf("%s%s", name, sep); 543 fmt++; 544 #ifdef __i386__ 545 if (!strcmp(name, "machdep.guessed_bootdev")) 546 return machdep_bootdev(*(unsigned long *)p); 547 #endif 548 val = ""; 549 while (len >= sizeof(long)) { 550 if(*fmt == 'U') 551 printf("%s%lu", val, *(unsigned long *)p); 552 else 553 printf("%s%ld", val, *(long *)p); 554 val = " "; 555 len -= sizeof(long); 556 p += sizeof(long); 557 } 558 return (0); 559 560 case 'P': 561 if (!nflag) 562 printf("%s%s", name, sep); 563 printf("%p", *(void **)p); 564 return (0); 565 566 case 'T': 567 case 'S': 568 i = 0; 569 if (strcmp(fmt, "S,clockinfo") == 0) 570 func = S_clockinfo; 571 else if (strcmp(fmt, "S,timeval") == 0) 572 func = S_timeval; 573 else if (strcmp(fmt, "S,loadavg") == 0) 574 func = S_loadavg; 575 else if (strcmp(fmt, "T,dev_t") == 0) 576 func = T_dev_t; 577 else 578 func = NULL; 579 if (func) { 580 if (!nflag) 581 printf("%s%s", name, sep); 582 return ((*func)(len, p)); 583 } 584 /* FALL THROUGH */ 585 default: 586 if (!oflag && !xflag) 587 return (1); 588 if (!nflag) 589 printf("%s%s", name, sep); 590 printf("Format:%s Length:%d Dump:0x", fmt, len); 591 while (len-- && (xflag || p < val + 16)) 592 printf("%02x", *p++); 593 if (!xflag && len > 16) 594 printf("..."); 595 return (0); 596 } 597 return (1); 598 } 599 600 static int 601 sysctl_all (int *oid, int len) 602 { 603 int name1[22], name2[22]; 604 int i, j; 605 size_t l1, l2; 606 607 name1[0] = 0; 608 name1[1] = 2; 609 l1 = 2; 610 if (len) { 611 memcpy(name1+2, oid, len * sizeof(int)); 612 l1 += len; 613 } else { 614 name1[2] = 1; 615 l1++; 616 } 617 for (;;) { 618 l2 = sizeof(name2); 619 j = sysctl(name1, l1, name2, &l2, 0, 0); 620 if (j < 0) { 621 if (errno == ENOENT) 622 return 0; 623 else 624 err(1, "sysctl(getnext) %d %d", j, l2); 625 } 626 627 l2 /= sizeof(int); 628 629 if (l2 < len) 630 return 0; 631 632 for (i = 0; i < len; i++) 633 if (name2[i] != oid[i]) 634 return 0; 635 636 i = show_var(name2, l2); 637 if (!i && !bflag) 638 putchar('\n'); 639 640 memcpy(name1+2, name2, l2 * sizeof(int)); 641 l1 = 2 + l2; 642 } 643 } 644