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 1.9 1995/12/21 12:39:25 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 } else { 141 if (wflag) 142 usage(); 143 } 144 len = name2oid(bufp, mib); 145 146 if (len < 0) 147 errx(1, "Unknown oid '%s'", bufp); 148 149 if (oidfmt(mib, len, 0, &kind)) 150 err(1, "Couldn't find format of oid '%s'", bufp); 151 152 if (!wflag) { 153 if ((kind & CTLTYPE) == CTLTYPE_NODE) { 154 sysctl_all(mib, len); 155 } else { 156 i = show_var(mib, len); 157 if (!i && !bflag) 158 putchar('\n'); 159 } 160 } else { 161 if ((kind & CTLTYPE) == CTLTYPE_NODE) 162 errx(1, "oid '%s' isn't a leaf node", bufp); 163 164 if (!(kind&CTLFLAG_WR)) 165 errx(1, "oid '%s' is read only", bufp); 166 167 switch (kind & CTLTYPE) { 168 case CTLTYPE_INT: 169 intval = atoi(newval); 170 newval = &intval; 171 newsize = sizeof intval; 172 break; 173 break; 174 case CTLTYPE_STRING: 175 break; 176 case CTLTYPE_QUAD: 177 break; 178 sscanf(newval, "%qd", &quadval); 179 newval = &quadval; 180 newsize = sizeof quadval; 181 break; 182 default: 183 errx(1, "oid '%s' is type %d," 184 " cannot set that", bufp); 185 } 186 187 i = show_var(mib, len); 188 if (sysctl(mib, len, 0, 0, newval, newsize) == -1) { 189 if (!i && !bflag) 190 putchar('\n'); 191 switch (errno) { 192 case EOPNOTSUPP: 193 errx(1, "%s: value is not available\n", 194 string); 195 case ENOTDIR: 196 errx(1, "%s: specification is incomplete\n", 197 string); 198 case ENOMEM: 199 errx(1, "%s: type is unknown to this program\n", 200 string); 201 default: 202 perror(string); 203 return; 204 } 205 } 206 if (!bflag) 207 printf(" -> "); 208 i = nflag; 209 nflag = 1; 210 j = show_var(mib, len); 211 if (!j && !bflag) 212 putchar('\n'); 213 nflag = i; 214 } 215 } 216 217 /* These functions will dump out various interesting structures. */ 218 219 static int 220 S_clockinfo(int l2, void *p) 221 { 222 struct clockinfo *ci = (struct clockinfo*)p; 223 if (l2 != sizeof *ci) 224 err(-1, "S_clockinfo %d != %d", l2, sizeof *ci); 225 printf("{ hz = %d, tick = %d, profhz = %d, stathz = %d }", 226 ci->hz, ci->tick, ci->profhz, ci->stathz); 227 return (0); 228 } 229 230 static int 231 S_loadavg(int l2, void *p) 232 { 233 struct loadavg *tv = (struct loadavg*)p; 234 235 if (l2 != sizeof *tv) 236 err(-1, "S_loadavg %d != %d", l2, sizeof *tv); 237 238 printf("{ %.2f %.2f %.2f }", 239 (double)tv->ldavg[0]/(double)tv->fscale, 240 (double)tv->ldavg[1]/(double)tv->fscale, 241 (double)tv->ldavg[2]/(double)tv->fscale); 242 return (0); 243 } 244 245 static int 246 S_timeval(int l2, void *p) 247 { 248 struct timeval *tv = (struct timeval*)p; 249 char *p1, *p2; 250 251 if (l2 != sizeof *tv) 252 err(-1, "S_timeval %d != %d", l2, sizeof *tv); 253 printf("{ sec = %ld, usec = %ld } ", 254 tv->tv_sec, tv->tv_usec); 255 p1 = strdup(ctime(&tv->tv_sec)); 256 for (p2=p1; *p2 ; p2++) 257 if (*p2 == '\n') 258 *p2 = '\0'; 259 fputs(p1, stdout); 260 return (0); 261 } 262 263 static int 264 T_dev_t(int l2, void *p) 265 { 266 dev_t *d = (dev_t *)p; 267 if (l2 != sizeof *d) 268 err(-1, "T_dev_T %d != %d", l2, sizeof *d); 269 printf("{ major = %d, minor = %d }", 270 major(*d), minor(*d)); 271 return (0); 272 } 273 274 /* 275 * These functions uses a presently undocumented interface to the kernel 276 * to walk the tree and get the type so it can print the value. 277 * This interface is under work and consideration, and should probably 278 * be killed with a big axe by the first person who can find the time. 279 * (be aware though, that the proper interface isn't as obvious as it 280 * may seem, there are various conflicting requirements. 281 */ 282 283 static int 284 name2oid(char *name, int *oidp) 285 { 286 int oid[2]; 287 int i, j; 288 289 oid[0] = 0; 290 oid[1] = 3; 291 292 j = CTL_MAXNAME * sizeof (int); 293 i = sysctl(oid, 2, oidp, &j, name, strlen(name)); 294 if (i < 0) 295 return i; 296 j /= sizeof (int); 297 return (j); 298 } 299 300 static int 301 oidfmt(int *oid, int len, char *fmt, u_int *kind) 302 { 303 int qoid[CTL_MAXNAME+2]; 304 u_char buf[BUFSIZ]; 305 int i, j; 306 307 qoid[0] = 0; 308 qoid[1] = 4; 309 memcpy(qoid + 2, oid, len * sizeof(int)); 310 311 j = sizeof buf; 312 i = sysctl(qoid, len + 2, buf, &j, 0, 0); 313 if (i) 314 err(-1, "sysctl fmt %d %d %d", i, j, errno); 315 316 if (kind) 317 *kind = *(u_int *)buf; 318 319 if (fmt) 320 strcpy(fmt, (char *)(buf + sizeof(u_int))); 321 return 0; 322 } 323 324 /* 325 * This formats and outputs the value of one variable 326 * 327 * Returns zero if anything was actually output. 328 * Returns one if didn't know what to do with this. 329 * Return minus one if we had errors. 330 */ 331 332 static int 333 show_var(int *oid, int nlen) 334 { 335 u_char buf[BUFSIZ], *val, *p; 336 char name[BUFSIZ], *fmt; 337 int qoid[CTL_MAXNAME+2]; 338 int i, j, len; 339 u_int kind; 340 int (*func)(int, void *) = 0; 341 342 /* find an estimate of how much we need for this var */ 343 j = 0; 344 i = sysctl(oid, nlen, 0, &j, 0, 0); 345 j += j; /* we want to be sure :-) */ 346 347 val = alloca(j); 348 len = j; 349 i = sysctl(oid, nlen, val, &len, 0, 0); 350 if (i || !len) 351 return (1); 352 353 if (bflag) { 354 fwrite(val, 1, len, stdout); 355 return (0); 356 } 357 358 qoid[0] = 0; 359 qoid[1] = 4; 360 memcpy(qoid + 2, oid, nlen * sizeof(int)); 361 362 j = sizeof buf; 363 i = sysctl(qoid, nlen + 2, buf, &j, 0, 0); 364 if (i || !j) 365 err(-1, "sysctl fmt %d %d %d", i, j, errno); 366 367 kind = *(u_int *)buf; 368 369 fmt = (char *)(buf + sizeof(u_int)); 370 371 qoid[1] = 1; 372 j = sizeof name; 373 i = sysctl(qoid, nlen + 2, name, &j, 0, 0); 374 if (i || !j) 375 err(-1, "sysctl name %d %d %d", i, j, errno); 376 377 p = val; 378 switch (*fmt) { 379 case 'A': 380 if (!nflag) 381 printf("%s: ", name); 382 printf("%s", p); 383 return (0); 384 385 case 'I': 386 if (!nflag) 387 printf("%s: ", name); 388 printf("%d", *(int *)p); 389 return (0); 390 391 case 'T': 392 case 'S': 393 i = 0; 394 if (!strcmp(fmt, "S,clockinfo")) func = S_clockinfo; 395 else if (!strcmp(fmt, "S,timeval")) func = S_timeval; 396 else if (!strcmp(fmt, "S,loadavg")) func = S_loadavg; 397 else if (!strcmp(fmt, "T,dev_t")) func = T_dev_t; 398 if (func) { 399 if (!nflag) 400 printf("%s: ", name); 401 return ((*func)(len, p)); 402 } 403 /* FALL THROUGH */ 404 default: 405 if (!Aflag) 406 return (1); 407 if (!nflag) 408 printf("%s: ", name); 409 printf("Format:%s Length:%d Dump:0x", fmt, len); 410 while (len--) { 411 printf("%02x", *p++); 412 if (Xflag || p < val+16) 413 continue; 414 printf("..."); 415 break; 416 } 417 return (0); 418 } 419 return (1); 420 } 421 422 static int 423 sysctl_all (int *oid, int len) 424 { 425 int name1[22], name2[22]; 426 int i, j, l1, l2; 427 428 name1[0] = 0; 429 name1[1] = 2; 430 l1 = 2; 431 if (len) { 432 memcpy(name1+2, oid, len*sizeof (int)); 433 l1 += len; 434 } else { 435 name1[2] = 1; 436 l1++; 437 } 438 while (1) { 439 l2 = sizeof name2; 440 j = sysctl(name1, l1, name2, &l2, 0, 0); 441 if (j < 0) 442 if (errno == ENOENT) 443 return 0; 444 else 445 err(-1, "sysctl(getnext) %d %d", j, l2); 446 447 l2 /= sizeof (int); 448 449 if (l2 < len) 450 return 0; 451 452 for (i = 0; i < len; i++) 453 if (name2[i] != oid[i]) 454 return 0; 455 456 i = show_var(name2, l2); 457 if (!i && !bflag) 458 putchar('\n'); 459 460 memcpy(name1+2, name2, l2*sizeof (int)); 461 l1 = 2 + l2; 462 } 463 } 464