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 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 #include <sys/types.h> 49 #include <sys/stat.h> 50 #include <sys/sysctl.h> 51 #include <sys/resource.h> 52 53 #include <ctype.h> 54 #include <err.h> 55 #include <errno.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 static int aflag, bflag, dflag, eflag, Nflag, nflag, oflag, xflag; 62 63 static int oidfmt(int *, int, char *, u_int *); 64 static void parse(char *); 65 static int show_var(int *, int); 66 static int sysctl_all (int *oid, int len); 67 static int name2oid(char *, int *); 68 69 static void 70 usage(void) 71 { 72 73 (void)fprintf(stderr, "%s\n%s\n", 74 "usage: sysctl [-bdeNnox] variable[=value] ...", 75 " sysctl [-bdeNnox] -a"); 76 exit(1); 77 } 78 79 int 80 main(int argc, char **argv) 81 { 82 int ch; 83 setbuf(stdout,0); 84 setbuf(stderr,0); 85 86 while ((ch = getopt(argc, argv, "AabdeNnowxX")) != -1) { 87 switch (ch) { 88 case 'A': 89 /* compatibility */ 90 aflag = oflag = 1; 91 break; 92 case 'a': 93 aflag = 1; 94 break; 95 case 'b': 96 bflag = 1; 97 break; 98 case 'd': 99 dflag = 1; 100 break; 101 case 'e': 102 eflag = 1; 103 break; 104 case 'N': 105 Nflag = 1; 106 break; 107 case 'n': 108 nflag = 1; 109 break; 110 case 'o': 111 oflag = 1; 112 break; 113 case 'w': 114 /* compatibility */ 115 /* ignored */ 116 break; 117 case 'X': 118 /* compatibility */ 119 aflag = xflag = 1; 120 break; 121 case 'x': 122 xflag = 1; 123 break; 124 default: 125 usage(); 126 } 127 } 128 argc -= optind; 129 argv += optind; 130 131 if (Nflag && nflag) 132 usage(); 133 if (aflag && argc == 0) 134 exit(sysctl_all(0, 0)); 135 if (argc == 0) 136 usage(); 137 while (argc-- > 0) 138 parse(*argv++); 139 exit(0); 140 } 141 142 /* 143 * Parse a name into a MIB entry. 144 * Lookup and print out the MIB entry if it exists. 145 * Set a new value if requested. 146 */ 147 static void 148 parse(char *string) 149 { 150 int len, i, j; 151 void *newval = 0; 152 int intval; 153 unsigned int uintval; 154 long longval; 155 unsigned long ulongval; 156 size_t newsize = 0; 157 quad_t quadval; 158 int mib[CTL_MAXNAME]; 159 char *cp, *bufp, buf[BUFSIZ]; 160 u_int kind; 161 162 bufp = buf; 163 snprintf(buf, BUFSIZ, "%s", string); 164 if ((cp = strchr(string, '=')) != NULL) { 165 *strchr(buf, '=') = '\0'; 166 *cp++ = '\0'; 167 while (isspace(*cp)) 168 cp++; 169 newval = cp; 170 newsize = strlen(cp); 171 } 172 len = name2oid(bufp, mib); 173 174 if (len < 0) 175 errx(1, "unknown oid '%s'", bufp); 176 177 if (oidfmt(mib, len, 0, &kind)) 178 err(1, "couldn't find format of oid '%s'", bufp); 179 180 if (newval == NULL) { 181 if ((kind & CTLTYPE) == CTLTYPE_NODE) { 182 sysctl_all(mib, len); 183 } else { 184 i = show_var(mib, len); 185 if (!i && !bflag) 186 putchar('\n'); 187 } 188 } else { 189 if ((kind & CTLTYPE) == CTLTYPE_NODE) 190 errx(1, "oid '%s' isn't a leaf node", bufp); 191 192 if (!(kind&CTLFLAG_WR)) 193 errx(1, "oid '%s' is read only", bufp); 194 195 switch (kind & CTLTYPE) { 196 case CTLTYPE_INT: 197 intval = (int) strtol(newval, NULL, 0); 198 newval = &intval; 199 newsize = sizeof(intval); 200 break; 201 case CTLTYPE_UINT: 202 uintval = (int) strtoul(newval, NULL, 0); 203 newval = &uintval; 204 newsize = sizeof uintval; 205 break; 206 case CTLTYPE_LONG: 207 longval = strtol(newval, NULL, 0); 208 newval = &longval; 209 newsize = sizeof longval; 210 break; 211 case CTLTYPE_ULONG: 212 ulongval = strtoul(newval, NULL, 0); 213 newval = &ulongval; 214 newsize = sizeof ulongval; 215 break; 216 case CTLTYPE_STRING: 217 break; 218 case CTLTYPE_QUAD: 219 break; 220 sscanf(newval, "%qd", &quadval); 221 newval = &quadval; 222 newsize = sizeof(quadval); 223 break; 224 default: 225 errx(1, "oid '%s' is type %d," 226 " cannot set that", bufp, 227 kind & CTLTYPE); 228 } 229 230 i = show_var(mib, len); 231 if (sysctl(mib, len, 0, 0, newval, newsize) == -1) { 232 if (!i && !bflag) 233 putchar('\n'); 234 switch (errno) { 235 case EOPNOTSUPP: 236 errx(1, "%s: value is not available", 237 string); 238 case ENOTDIR: 239 errx(1, "%s: specification is incomplete", 240 string); 241 case ENOMEM: 242 errx(1, "%s: type is unknown to this program", 243 string); 244 default: 245 warn("%s", string); 246 return; 247 } 248 } 249 if (!bflag) 250 printf(" -> "); 251 i = nflag; 252 nflag = 1; 253 j = show_var(mib, len); 254 if (!j && !bflag) 255 putchar('\n'); 256 nflag = i; 257 } 258 } 259 260 /* These functions will dump out various interesting structures. */ 261 262 static int 263 S_clockinfo(int l2, void *p) 264 { 265 struct clockinfo *ci = (struct clockinfo*)p; 266 if (l2 != sizeof(*ci)) 267 err(1, "S_clockinfo %d != %d", l2, sizeof(*ci)); 268 printf("{ hz = %d, tick = %d, tickadj = %d, profhz = %d, stathz = %d }", 269 ci->hz, ci->tick, ci->tickadj, ci->profhz, ci->stathz); 270 return (0); 271 } 272 273 static int 274 S_loadavg(int l2, void *p) 275 { 276 struct loadavg *tv = (struct loadavg*)p; 277 278 if (l2 != sizeof(*tv)) 279 err(1, "S_loadavg %d != %d", l2, sizeof(*tv)); 280 281 printf("{ %.2f %.2f %.2f }", 282 (double)tv->ldavg[0]/(double)tv->fscale, 283 (double)tv->ldavg[1]/(double)tv->fscale, 284 (double)tv->ldavg[2]/(double)tv->fscale); 285 return (0); 286 } 287 288 static int 289 S_timeval(int l2, void *p) 290 { 291 struct timeval *tv = (struct timeval*)p; 292 time_t tv_sec; 293 char *p1, *p2; 294 295 if (l2 != sizeof(*tv)) 296 err(1, "S_timeval %d != %d", l2, sizeof(*tv)); 297 printf("{ sec = %ld, usec = %ld } ", 298 tv->tv_sec, tv->tv_usec); 299 tv_sec = tv->tv_sec; 300 p1 = strdup(ctime(&tv_sec)); 301 for (p2=p1; *p2 ; p2++) 302 if (*p2 == '\n') 303 *p2 = '\0'; 304 fputs(p1, stdout); 305 return (0); 306 } 307 308 static int 309 T_dev_t(int l2, void *p) 310 { 311 dev_t *d = (dev_t *)p; 312 if (l2 != sizeof(*d)) 313 err(1, "T_dev_T %d != %d", l2, sizeof(*d)); 314 if ((int)(*d) != -1) { 315 if (minor(*d) > 255 || minor(*d) < 0) 316 printf("{ major = %d, minor = 0x%x }", 317 major(*d), minor(*d)); 318 else 319 printf("{ major = %d, minor = %d }", 320 major(*d), minor(*d)); 321 } 322 return (0); 323 } 324 325 /* 326 * These functions uses a presently undocumented interface to the kernel 327 * to walk the tree and get the type so it can print the value. 328 * This interface is under work and consideration, and should probably 329 * be killed with a big axe by the first person who can find the time. 330 * (be aware though, that the proper interface isn't as obvious as it 331 * may seem, there are various conflicting requirements. 332 */ 333 334 static int 335 name2oid(char *name, int *oidp) 336 { 337 int oid[2]; 338 int i; 339 size_t j; 340 341 oid[0] = 0; 342 oid[1] = 3; 343 344 j = CTL_MAXNAME * sizeof(int); 345 i = sysctl(oid, 2, oidp, &j, name, strlen(name)); 346 if (i < 0) 347 return i; 348 j /= sizeof(int); 349 return (j); 350 } 351 352 static int 353 oidfmt(int *oid, int len, char *fmt, u_int *kind) 354 { 355 int qoid[CTL_MAXNAME+2]; 356 u_char buf[BUFSIZ]; 357 int i; 358 size_t j; 359 360 qoid[0] = 0; 361 qoid[1] = 4; 362 memcpy(qoid + 2, oid, len * sizeof(int)); 363 364 j = sizeof(buf); 365 i = sysctl(qoid, len + 2, buf, &j, 0, 0); 366 if (i) 367 err(1, "sysctl fmt %d %d %d", i, j, errno); 368 369 if (kind) 370 *kind = *(u_int *)buf; 371 372 if (fmt) 373 strcpy(fmt, (char *)(buf + sizeof(u_int))); 374 return 0; 375 } 376 377 /* 378 * This formats and outputs the value of one variable 379 * 380 * Returns zero if anything was actually output. 381 * Returns one if didn't know what to do with this. 382 * Return minus one if we had errors. 383 */ 384 385 static int 386 show_var(int *oid, int nlen) 387 { 388 u_char buf[BUFSIZ], *val, *p; 389 char name[BUFSIZ], *fmt, *sep; 390 int qoid[CTL_MAXNAME+2]; 391 int i; 392 size_t j, len; 393 u_int kind; 394 int (*func)(int, void *); 395 396 qoid[0] = 0; 397 memcpy(qoid + 2, oid, nlen * sizeof(int)); 398 399 qoid[1] = 1; 400 j = sizeof(name); 401 i = sysctl(qoid, nlen + 2, name, &j, 0, 0); 402 if (i || !j) 403 err(1, "sysctl name %d %d %d", i, j, errno); 404 405 if (Nflag) { 406 printf("%s", name); 407 return (0); 408 } 409 410 if (eflag) 411 sep = "="; 412 else 413 sep = ": "; 414 415 if (dflag) { /* just print description */ 416 qoid[1] = 5; 417 j = sizeof(buf); 418 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0); 419 if (!nflag) 420 printf("%s%s", name, sep); 421 printf("%s", buf); 422 return (0); 423 } 424 /* find an estimate of how much we need for this var */ 425 j = 0; 426 i = sysctl(oid, nlen, 0, &j, 0, 0); 427 j += j; /* we want to be sure :-) */ 428 429 val = alloca(j); 430 len = j; 431 i = sysctl(oid, nlen, val, &len, 0, 0); 432 if (i || !len) 433 return (1); 434 435 if (bflag) { 436 fwrite(val, 1, len, stdout); 437 return (0); 438 } 439 440 qoid[1] = 4; 441 j = sizeof(buf); 442 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0); 443 if (i || !j) 444 err(1, "sysctl fmt %d %d %d", i, j, errno); 445 446 kind = *(u_int *)buf; 447 448 fmt = (char *)(buf + sizeof(u_int)); 449 450 p = val; 451 switch (*fmt) { 452 case 'A': 453 if (!nflag) 454 printf("%s%s", name, sep); 455 printf("%s", p); 456 return (0); 457 458 case 'I': 459 if (!nflag) 460 printf("%s%s", name, sep); 461 fmt++; 462 val = ""; 463 while (len >= sizeof(int)) { 464 if(*fmt == 'U') 465 printf("%s%u", val, *(unsigned int *)p); 466 else 467 printf("%s%d", val, *(int *)p); 468 val = " "; 469 len -= sizeof(int); 470 p += sizeof(int); 471 } 472 return (0); 473 474 case 'L': 475 if (!nflag) 476 printf("%s%s", name, sep); 477 fmt++; 478 val = ""; 479 while (len >= sizeof(long)) { 480 if(*fmt == 'U') 481 printf("%s%lu", val, *(unsigned long *)p); 482 else 483 printf("%s%ld", val, *(long *)p); 484 val = " "; 485 len -= sizeof(long); 486 p += sizeof(long); 487 } 488 return (0); 489 490 case 'P': 491 if (!nflag) 492 printf("%s%s", name, sep); 493 printf("%p", *(void **)p); 494 return (0); 495 496 case 'T': 497 case 'S': 498 i = 0; 499 if (strcmp(fmt, "S,clockinfo") == 0) 500 func = S_clockinfo; 501 else if (strcmp(fmt, "S,timeval") == 0) 502 func = S_timeval; 503 else if (strcmp(fmt, "S,loadavg") == 0) 504 func = S_loadavg; 505 else if (strcmp(fmt, "T,dev_t") == 0) 506 func = T_dev_t; 507 else 508 func = NULL; 509 if (func) { 510 if (!nflag) 511 printf("%s%s", name, sep); 512 return ((*func)(len, p)); 513 } 514 /* FALL THROUGH */ 515 default: 516 if (!oflag && !xflag) 517 return (1); 518 if (!nflag) 519 printf("%s%s", name, sep); 520 printf("Format:%s Length:%d Dump:0x", fmt, len); 521 while (len-- && (xflag || p < val + 16)) 522 printf("%02x", *p++); 523 if (!xflag && len > 16) 524 printf("..."); 525 return (0); 526 } 527 return (1); 528 } 529 530 static int 531 sysctl_all (int *oid, int len) 532 { 533 int name1[22], name2[22]; 534 int i, j; 535 size_t l1, l2; 536 537 name1[0] = 0; 538 name1[1] = 2; 539 l1 = 2; 540 if (len) { 541 memcpy(name1+2, oid, len * sizeof(int)); 542 l1 += len; 543 } else { 544 name1[2] = 1; 545 l1++; 546 } 547 for (;;) { 548 l2 = sizeof(name2); 549 j = sysctl(name1, l1, name2, &l2, 0, 0); 550 if (j < 0) { 551 if (errno == ENOENT) 552 return 0; 553 else 554 err(1, "sysctl(getnext) %d %d", j, l2); 555 } 556 557 l2 /= sizeof(int); 558 559 if (l2 < len) 560 return 0; 561 562 for (i = 0; i < len; i++) 563 if (name2[i] != oid[i]) 564 return 0; 565 566 i = show_var(name2, l2); 567 if (!i && !bflag) 568 putchar('\n'); 569 570 memcpy(name1+2, name2, l2 * sizeof(int)); 571 l1 = 2 + l2; 572 } 573 } 574