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