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 "$Id: sysctl.c,v 1.15 1997/10/20 12:53:54 charnier Exp $"; 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, nflag, wflag, Xflag, bflag; 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", 74 "usage: sysctl [-bnX] variable ...", 75 " sysctl [-bnX] -w variable=value ...", 76 " sysctl [-bnX] -a", 77 " sysctl [-bnX] -A"); 78 exit(1); 79 } 80 81 int 82 main(int argc, char **argv) 83 { 84 int ch; 85 setbuf(stdout,0); 86 setbuf(stderr,0); 87 88 while ((ch = getopt(argc, argv, "AabnwX")) != -1) { 89 switch (ch) { 90 case 'A': Aflag = 1; break; 91 case 'a': aflag = 1; break; 92 case 'b': bflag = 1; break; 93 case 'n': nflag = 1; break; 94 case 'w': wflag = 1; break; 95 case 'X': Xflag = Aflag = 1; break; 96 default: usage(); 97 } 98 } 99 argc -= optind; 100 argv += optind; 101 102 if (Aflag || aflag) 103 exit (sysctl_all(0, 0)); 104 if (argc == 0) 105 usage(); 106 while (argc-- > 0) 107 parse(*argv++); 108 exit(0); 109 } 110 111 /* 112 * Parse a name into a MIB entry. 113 * Lookup and print out the MIB entry if it exists. 114 * Set a new value if requested. 115 */ 116 static void 117 parse(char *string) 118 { 119 int len, i, j; 120 void *newval = 0; 121 int intval, newsize = 0; 122 quad_t quadval; 123 int mib[CTL_MAXNAME]; 124 char *cp, *bufp, buf[BUFSIZ]; 125 u_int kind; 126 127 bufp = buf; 128 snprintf(buf, BUFSIZ, "%s", string); 129 if ((cp = strchr(string, '=')) != NULL) { 130 if (!wflag) 131 errx(2, "must specify -w to set variables"); 132 *strchr(buf, '=') = '\0'; 133 *cp++ = '\0'; 134 while (isspace(*cp)) 135 cp++; 136 newval = cp; 137 newsize = strlen(cp); 138 } else { 139 if (wflag) 140 usage(); 141 } 142 len = name2oid(bufp, mib); 143 144 if (len < 0) 145 errx(1, "unknown oid '%s'", bufp); 146 147 if (oidfmt(mib, len, 0, &kind)) 148 err(1, "couldn't find format of oid '%s'", bufp); 149 150 if (!wflag) { 151 if ((kind & CTLTYPE) == CTLTYPE_NODE) { 152 sysctl_all(mib, len); 153 } else { 154 i = show_var(mib, len); 155 if (!i && !bflag) 156 putchar('\n'); 157 } 158 } else { 159 if ((kind & CTLTYPE) == CTLTYPE_NODE) 160 errx(1, "oid '%s' isn't a leaf node", bufp); 161 162 if (!(kind&CTLFLAG_WR)) 163 errx(1, "oid '%s' is read only", bufp); 164 165 switch (kind & CTLTYPE) { 166 case CTLTYPE_INT: 167 intval = atoi(newval); 168 newval = &intval; 169 newsize = sizeof intval; 170 break; 171 break; 172 case CTLTYPE_STRING: 173 break; 174 case CTLTYPE_QUAD: 175 break; 176 sscanf(newval, "%qd", &quadval); 177 newval = &quadval; 178 newsize = sizeof quadval; 179 break; 180 default: 181 errx(1, "oid '%s' is type %d," 182 " cannot set that", bufp, 183 kind & CTLTYPE); 184 } 185 186 i = show_var(mib, len); 187 if (sysctl(mib, len, 0, 0, newval, newsize) == -1) { 188 if (!i && !bflag) 189 putchar('\n'); 190 switch (errno) { 191 case EOPNOTSUPP: 192 errx(1, "%s: value is not available", 193 string); 194 case ENOTDIR: 195 errx(1, "%s: specification is incomplete", 196 string); 197 case ENOMEM: 198 errx(1, "%s: type is unknown to this program", 199 string); 200 default: 201 warn("%s", string); 202 return; 203 } 204 } 205 if (!bflag) 206 printf(" -> "); 207 i = nflag; 208 nflag = 1; 209 j = show_var(mib, len); 210 if (!j && !bflag) 211 putchar('\n'); 212 nflag = i; 213 } 214 } 215 216 /* These functions will dump out various interesting structures. */ 217 218 static int 219 S_clockinfo(int l2, void *p) 220 { 221 struct clockinfo *ci = (struct clockinfo*)p; 222 if (l2 != sizeof *ci) 223 err(1, "S_clockinfo %d != %d", l2, sizeof *ci); 224 printf("{ hz = %d, tick = %d, tickadj = %d, profhz = %d, stathz = %d }", 225 ci->hz, ci->tick, ci->tickadj, ci->profhz, ci->stathz); 226 return (0); 227 } 228 229 static int 230 S_loadavg(int l2, void *p) 231 { 232 struct loadavg *tv = (struct loadavg*)p; 233 234 if (l2 != sizeof *tv) 235 err(1, "S_loadavg %d != %d", l2, sizeof *tv); 236 237 printf("{ %.2f %.2f %.2f }", 238 (double)tv->ldavg[0]/(double)tv->fscale, 239 (double)tv->ldavg[1]/(double)tv->fscale, 240 (double)tv->ldavg[2]/(double)tv->fscale); 241 return (0); 242 } 243 244 static int 245 S_timeval(int l2, void *p) 246 { 247 struct timeval *tv = (struct timeval*)p; 248 char *p1, *p2; 249 250 if (l2 != sizeof *tv) 251 err(1, "S_timeval %d != %d", l2, sizeof *tv); 252 printf("{ sec = %ld, usec = %ld } ", 253 tv->tv_sec, tv->tv_usec); 254 p1 = strdup(ctime(&tv->tv_sec)); 255 for (p2=p1; *p2 ; p2++) 256 if (*p2 == '\n') 257 *p2 = '\0'; 258 fputs(p1, stdout); 259 return (0); 260 } 261 262 static int 263 T_dev_t(int l2, void *p) 264 { 265 dev_t *d = (dev_t *)p; 266 if (l2 != sizeof *d) 267 err(1, "T_dev_T %d != %d", l2, sizeof *d); 268 printf("{ major = %d, minor = %d }", 269 major(*d), minor(*d)); 270 return (0); 271 } 272 273 /* 274 * These functions uses a presently undocumented interface to the kernel 275 * to walk the tree and get the type so it can print the value. 276 * This interface is under work and consideration, and should probably 277 * be killed with a big axe by the first person who can find the time. 278 * (be aware though, that the proper interface isn't as obvious as it 279 * may seem, there are various conflicting requirements. 280 */ 281 282 static int 283 name2oid(char *name, int *oidp) 284 { 285 int oid[2]; 286 int i, j; 287 288 oid[0] = 0; 289 oid[1] = 3; 290 291 j = CTL_MAXNAME * sizeof (int); 292 i = sysctl(oid, 2, oidp, &j, name, strlen(name)); 293 if (i < 0) 294 return i; 295 j /= sizeof (int); 296 return (j); 297 } 298 299 static int 300 oidfmt(int *oid, int len, char *fmt, u_int *kind) 301 { 302 int qoid[CTL_MAXNAME+2]; 303 u_char buf[BUFSIZ]; 304 int i, j; 305 306 qoid[0] = 0; 307 qoid[1] = 4; 308 memcpy(qoid + 2, oid, len * sizeof(int)); 309 310 j = sizeof buf; 311 i = sysctl(qoid, len + 2, buf, &j, 0, 0); 312 if (i) 313 err(1, "sysctl fmt %d %d %d", i, j, errno); 314 315 if (kind) 316 *kind = *(u_int *)buf; 317 318 if (fmt) 319 strcpy(fmt, (char *)(buf + sizeof(u_int))); 320 return 0; 321 } 322 323 /* 324 * This formats and outputs the value of one variable 325 * 326 * Returns zero if anything was actually output. 327 * Returns one if didn't know what to do with this. 328 * Return minus one if we had errors. 329 */ 330 331 static int 332 show_var(int *oid, int nlen) 333 { 334 u_char buf[BUFSIZ], *val, *p; 335 char name[BUFSIZ], *fmt; 336 int qoid[CTL_MAXNAME+2]; 337 int i, j, len; 338 u_int kind; 339 int (*func)(int, void *) = 0; 340 341 /* find an estimate of how much we need for this var */ 342 j = 0; 343 i = sysctl(oid, nlen, 0, &j, 0, 0); 344 j += j; /* we want to be sure :-) */ 345 346 val = alloca(j); 347 len = j; 348 i = sysctl(oid, nlen, val, &len, 0, 0); 349 if (i || !len) 350 return (1); 351 352 if (bflag) { 353 fwrite(val, 1, len, stdout); 354 return (0); 355 } 356 357 qoid[0] = 0; 358 qoid[1] = 4; 359 memcpy(qoid + 2, oid, nlen * sizeof(int)); 360 361 j = sizeof buf; 362 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0); 363 if (i || !j) 364 err(1, "sysctl fmt %d %d %d", i, j, errno); 365 366 kind = *(u_int *)buf; 367 368 fmt = (char *)(buf + sizeof(u_int)); 369 370 qoid[1] = 1; 371 j = sizeof name; 372 i = sysctl(qoid, nlen + 2, name, &j, 0, 0); 373 if (i || !j) 374 err(1, "sysctl name %d %d %d", i, j, errno); 375 376 p = val; 377 switch (*fmt) { 378 case 'A': 379 if (!nflag) 380 printf("%s: ", name); 381 printf("%s", p); 382 return (0); 383 384 case 'I': 385 if (!nflag) 386 printf("%s: ", name); 387 printf("%d", *(int *)p); 388 return (0); 389 390 case 'T': 391 case 'S': 392 i = 0; 393 if (!strcmp(fmt, "S,clockinfo")) func = S_clockinfo; 394 else if (!strcmp(fmt, "S,timeval")) func = S_timeval; 395 else if (!strcmp(fmt, "S,loadavg")) func = S_loadavg; 396 else if (!strcmp(fmt, "T,dev_t")) func = T_dev_t; 397 if (func) { 398 if (!nflag) 399 printf("%s: ", name); 400 return ((*func)(len, p)); 401 } 402 /* FALL THROUGH */ 403 default: 404 if (!Aflag) 405 return (1); 406 if (!nflag) 407 printf("%s: ", name); 408 printf("Format:%s Length:%d Dump:0x", fmt, len); 409 while (len--) { 410 printf("%02x", *p++); 411 if (Xflag || p < val+16) 412 continue; 413 printf("..."); 414 break; 415 } 416 return (0); 417 } 418 return (1); 419 } 420 421 static int 422 sysctl_all (int *oid, int len) 423 { 424 int name1[22], name2[22]; 425 int i, j, l1, l2; 426 427 name1[0] = 0; 428 name1[1] = 2; 429 l1 = 2; 430 if (len) { 431 memcpy(name1+2, oid, len*sizeof (int)); 432 l1 += len; 433 } else { 434 name1[2] = 1; 435 l1++; 436 } 437 while (1) { 438 l2 = sizeof name2; 439 j = sysctl(name1, l1, name2, &l2, 0, 0); 440 if (j < 0) 441 if (errno == ENOENT) 442 return 0; 443 else 444 err(1, "sysctl(getnext) %d %d", j, l2); 445 446 l2 /= sizeof (int); 447 448 if (l2 < len) 449 return 0; 450 451 for (i = 0; i < len; i++) 452 if (name2[i] != oid[i]) 453 return 0; 454 455 i = show_var(name2, l2); 456 if (!i && !bflag) 457 putchar('\n'); 458 459 memcpy(name1+2, name2, l2*sizeof (int)); 460 l1 = 2 + l2; 461 } 462 } 463