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 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 /*static char sccsid[] = "From: @(#)sysctl.c 8.1 (Berkeley) 6/6/93"; */ 42 static const char rcsid[] = 43 "$Id: sysctl.c,v 1.8 1995/11/17 16:28:42 phk Exp $"; 44 #endif /* not lint */ 45 46 #include <sys/types.h> 47 #include <sys/stat.h> 48 #include <sys/sysctl.h> 49 #include <sys/resource.h> 50 51 #include <errno.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <ctype.h> 56 #include <err.h> 57 58 static int Aflag, aflag, nflag, wflag, Xflag, bflag; 59 60 static int oidfmt(int *, int, char *, u_int *); 61 static void parse(char *); 62 static int show_var(int *, int); 63 static int sysctl_all (int *oid, int len); 64 static int name2oid(char *, int *); 65 66 static void 67 usage(void) 68 { 69 70 (void)fprintf(stderr, "usage:\n%s", 71 "\tsysctl [-bnX] variable ...\n" 72 "\tsysctl [-bnX] -w variable=value ...\n" 73 "\tsysctl [-bnX] -a\n" 74 "\tsysctl [-bnX] -A\n" 75 ); 76 exit(1); 77 } 78 79 int 80 main(int argc, char **argv) 81 { 82 extern char *optarg; 83 extern int optind; 84 int ch; 85 setbuf(stdout,0); 86 setbuf(stderr,0); 87 88 while ((ch = getopt(argc, argv, "AabnwX")) != EOF) { 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 fprintf(stderr, "Must specify -w to set variables\n"); 132 exit(2); 133 } 134 *strchr(buf, '=') = '\0'; 135 *cp++ = '\0'; 136 while (isspace(*cp)) 137 cp++; 138 newval = cp; 139 newsize = strlen(cp); 140 } 141 len = name2oid(bufp, mib); 142 143 if (len < 0) 144 errx(1, "Unknown oid '%s'", bufp); 145 146 if (oidfmt(mib, len, 0, &kind)) 147 err(1, "Couldn't find format of oid '%s'", bufp); 148 149 if (!wflag) { 150 if ((kind & CTLTYPE) == CTLTYPE_NODE) { 151 sysctl_all(mib, len); 152 } else { 153 i = show_var(mib, len); 154 if (!i && !bflag) 155 putchar('\n'); 156 } 157 } else { 158 if ((kind & CTLTYPE) == CTLTYPE_NODE) 159 errx(1, "oid '%s' isn't a leaf node", bufp); 160 161 if (!(kind&CTLFLAG_WR)) 162 errx(1, "oid '%s' is read only", bufp); 163 164 switch (kind & CTLTYPE) { 165 case CTLTYPE_INT: 166 intval = atoi(newval); 167 newval = &intval; 168 newsize = sizeof intval; 169 break; 170 break; 171 case CTLTYPE_STRING: 172 break; 173 case CTLTYPE_QUAD: 174 break; 175 sscanf(newval, "%qd", &quadval); 176 newval = &quadval; 177 newsize = sizeof quadval; 178 break; 179 default: 180 errx(1, "oid '%s' is type %d," 181 " cannot set that", bufp); 182 } 183 184 i = show_var(mib, len); 185 if (sysctl(mib, len, 0, 0, newval, newsize) == -1) { 186 if (!i && !bflag) 187 putchar('\n'); 188 switch (errno) { 189 case EOPNOTSUPP: 190 errx(1, "%s: value is not available\n", 191 string); 192 case ENOTDIR: 193 errx(1, "%s: specification is incomplete\n", 194 string); 195 case ENOMEM: 196 errx(1, "%s: type is unknown to this program\n", 197 string); 198 default: 199 perror(string); 200 return; 201 } 202 } 203 if (!bflag) 204 printf(" -> "); 205 i = nflag; 206 nflag = 1; 207 j = show_var(mib, len); 208 if (!j && !bflag) 209 putchar('\n'); 210 nflag = i; 211 } 212 } 213 214 /* These functions will dump out various interesting structures. */ 215 216 static int 217 S_clockinfo(int l2, void *p) 218 { 219 struct clockinfo *ci = (struct clockinfo*)p; 220 if (l2 != sizeof *ci) 221 err(-1, "S_clockinfo %d != %d", l2, sizeof *ci); 222 printf("{ hz = %d, tick = %d, profhz = %d, stathz = %d }", 223 ci->hz, ci->tick, ci->profhz, ci->stathz); 224 return (0); 225 } 226 227 static int 228 S_loadavg(int l2, void *p) 229 { 230 struct loadavg *tv = (struct loadavg*)p; 231 232 if (l2 != sizeof *tv) 233 err(-1, "S_loadavg %d != %d", l2, sizeof *tv); 234 235 printf("{ %.2f %.2f %.2f }", 236 (double)tv->ldavg[0]/(double)tv->fscale, 237 (double)tv->ldavg[1]/(double)tv->fscale, 238 (double)tv->ldavg[2]/(double)tv->fscale); 239 return (0); 240 } 241 242 static int 243 S_timeval(int l2, void *p) 244 { 245 struct timeval *tv = (struct timeval*)p; 246 char *p1, *p2; 247 248 if (l2 != sizeof *tv) 249 err(-1, "S_timeval %d != %d", l2, sizeof *tv); 250 printf("{ sec = %ld, usec = %ld } ", 251 tv->tv_sec, tv->tv_usec); 252 p1 = strdup(ctime(&tv->tv_sec)); 253 for (p2=p1; *p2 ; p2++) 254 if (*p2 == '\n') 255 *p2 = '\0'; 256 fputs(p1, stdout); 257 return (0); 258 } 259 260 static int 261 T_dev_t(int l2, void *p) 262 { 263 dev_t *d = (dev_t *)p; 264 if (l2 != sizeof *d) 265 err(-1, "T_dev_T %d != %d", l2, sizeof *d); 266 printf("{ major = %d, minor = %d }", 267 major(*d), minor(*d)); 268 return (0); 269 } 270 271 /* 272 * These functions uses a presently undocumented interface to the kernel 273 * to walk the tree and get the type so it can print the value. 274 * This interface is under work and consideration, and should probably 275 * be killed with a big axe by the first person who can find the time. 276 * (be aware though, that the proper interface isn't as obvious as it 277 * may seem, there are various conflicting requirements. 278 */ 279 280 static int 281 name2oid(char *name, int *oidp) 282 { 283 int oid[2]; 284 int i, j; 285 286 oid[0] = 0; 287 oid[1] = 3; 288 289 j = CTL_MAXNAME * sizeof (int); 290 i = sysctl(oid, 2, oidp, &j, name, strlen(name)); 291 if (i < 0) 292 return i; 293 j /= sizeof (int); 294 return (j); 295 } 296 297 static int 298 oidfmt(int *oid, int len, char *fmt, u_int *kind) 299 { 300 int qoid[CTL_MAXNAME+2]; 301 u_char buf[BUFSIZ]; 302 int i, j; 303 304 qoid[0] = 0; 305 qoid[1] = 4; 306 memcpy(qoid + 2, oid, len * sizeof(int)); 307 308 j = sizeof buf; 309 i = sysctl(qoid, len + 2, buf, &j, 0, 0); 310 if (i) 311 err(-1, "sysctl fmt %d %d %d", i, j, errno); 312 313 if (kind) 314 *kind = *(u_int *)buf; 315 316 if (fmt) 317 strcpy(fmt, (char *)(buf + sizeof(u_int))); 318 return 0; 319 } 320 321 /* 322 * This formats and outputs the value of one variable 323 * 324 * Returns zero if anything was actually output. 325 * Returns one if didn't know what to do with this. 326 * Return minus one if we had errors. 327 */ 328 329 static int 330 show_var(int *oid, int nlen) 331 { 332 u_char buf[BUFSIZ], *val, *p; 333 char name[BUFSIZ], *fmt; 334 int qoid[CTL_MAXNAME+2]; 335 int i, j, len; 336 u_int kind; 337 int (*func)(int, void *) = 0; 338 339 /* find an estimate of how much we need for this var */ 340 j = 0; 341 i = sysctl(oid, nlen, 0, &j, 0, 0); 342 j += j; /* we want to be sure :-) */ 343 344 val = alloca(j); 345 len = j; 346 i = sysctl(oid, nlen, val, &len, 0, 0); 347 if (i || !len) 348 return (1); 349 350 if (bflag) { 351 fwrite(val, 1, len, stdout); 352 return (0); 353 } 354 355 qoid[0] = 0; 356 qoid[1] = 4; 357 memcpy(qoid + 2, oid, nlen * sizeof(int)); 358 359 j = sizeof buf; 360 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0); 361 if (i || !j) 362 err(-1, "sysctl fmt %d %d %d", i, j, errno); 363 364 kind = *(u_int *)buf; 365 366 fmt = (char *)(buf + sizeof(u_int)); 367 368 qoid[1] = 1; 369 j = sizeof name; 370 i = sysctl(qoid, nlen + 2, name, &j, 0, 0); 371 if (i || !j) 372 err(-1, "sysctl name %d %d %d", i, j, errno); 373 374 p = val; 375 switch (*fmt) { 376 case 'A': 377 if (!nflag) 378 printf("%s: ", name); 379 printf("%s", p); 380 return (0); 381 382 case 'I': 383 if (!nflag) 384 printf("%s: ", name); 385 printf("%d", *(int *)p); 386 return (0); 387 388 case 'T': 389 case 'S': 390 i = 0; 391 if (!strcmp(fmt, "S,clockinfo")) func = S_clockinfo; 392 else if (!strcmp(fmt, "S,timeval")) func = S_timeval; 393 else if (!strcmp(fmt, "S,loadavg")) func = S_loadavg; 394 else if (!strcmp(fmt, "T,dev_t")) func = T_dev_t; 395 if (func) { 396 if (!nflag) 397 printf("%s: ", name); 398 return ((*func)(len, p)); 399 } 400 /* FALL THROUGH */ 401 default: 402 if (!Aflag) 403 return (1); 404 if (!nflag) 405 printf("%s: ", name); 406 printf("Format:%s Length:%d Dump:0x", fmt, len); 407 while (len--) { 408 printf("%02x", *p++); 409 if (Xflag || p < val+16) 410 continue; 411 printf("..."); 412 break; 413 } 414 return (0); 415 } 416 return (1); 417 } 418 419 static int 420 sysctl_all (int *oid, int len) 421 { 422 int name1[22], name2[22]; 423 int i, j, l1, l2; 424 425 name1[0] = 0; 426 name1[1] = 2; 427 l1 = 2; 428 if (len) { 429 memcpy(name1+2, oid, len*sizeof (int)); 430 l1 += len; 431 } else { 432 name1[2] = 1; 433 l1++; 434 } 435 while (1) { 436 l2 = sizeof name2; 437 j = sysctl(name1, l1, name2, &l2, 0, 0); 438 if (j < 0) 439 if (errno == ENOENT) 440 return 0; 441 else 442 err(-1, "sysctl(getnext) %d %d", j, l2); 443 444 l2 /= sizeof (int); 445 446 if (l2 < len) 447 return 0; 448 449 for (i = 0; i < len; i++) 450 if (name2[i] != oid[i]) 451 return 0; 452 453 i = show_var(name2, l2); 454 if (!i && !bflag) 455 putchar('\n'); 456 457 memcpy(name1+2, name2, l2*sizeof (int)); 458 l1 = 2 + l2; 459 } 460 } 461