kern_sysctl.c revision 136999
1/*- 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Mike Karels at Berkeley Software Design, Inc. 7 * 8 * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD 9 * project, to make these variables more userfriendly. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 36 */ 37 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD: head/sys/kern/kern_sysctl.c 136999 2004-10-27 19:26:01Z rwatson $"); 40 41#include "opt_compat.h" 42#include "opt_mac.h" 43 44#include <sys/param.h> 45#include <sys/systm.h> 46#include <sys/kernel.h> 47#include <sys/sysctl.h> 48#include <sys/mac.h> 49#include <sys/malloc.h> 50#include <sys/proc.h> 51#include <sys/lock.h> 52#include <sys/mutex.h> 53#include <sys/sx.h> 54#include <sys/sysproto.h> 55#include <vm/vm.h> 56#include <vm/vm_extern.h> 57 58static MALLOC_DEFINE(M_SYSCTL, "sysctl", "sysctl internal magic"); 59static MALLOC_DEFINE(M_SYSCTLOID, "sysctloid", "sysctl dynamic oids"); 60static MALLOC_DEFINE(M_SYSCTLTMP, "sysctltmp", "sysctl temp output buffer"); 61 62/* 63 * Locking - this locks the sysctl tree in memory. 64 */ 65static struct sx sysctllock; 66 67#define SYSCTL_LOCK() sx_xlock(&sysctllock) 68#define SYSCTL_UNLOCK() sx_xunlock(&sysctllock) 69#define SYSCTL_INIT() sx_init(&sysctllock, "sysctl lock") 70 71static int sysctl_root(SYSCTL_HANDLER_ARGS); 72 73struct sysctl_oid_list sysctl__children; /* root list */ 74 75static struct sysctl_oid * 76sysctl_find_oidname(const char *name, struct sysctl_oid_list *list) 77{ 78 struct sysctl_oid *oidp; 79 80 SLIST_FOREACH(oidp, list, oid_link) { 81 if (strcmp(oidp->oid_name, name) == 0) { 82 return (oidp); 83 } 84 } 85 return (NULL); 86} 87 88/* 89 * Initialization of the MIB tree. 90 * 91 * Order by number in each list. 92 */ 93 94void 95sysctl_register_oid(struct sysctl_oid *oidp) 96{ 97 struct sysctl_oid_list *parent = oidp->oid_parent; 98 struct sysctl_oid *p; 99 struct sysctl_oid *q; 100 101 /* 102 * First check if another oid with the same name already 103 * exists in the parent's list. 104 */ 105 p = sysctl_find_oidname(oidp->oid_name, parent); 106 if (p != NULL) { 107 if ((p->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 108 p->oid_refcnt++; 109 return; 110 } else { 111 printf("can't re-use a leaf (%s)!\n", p->oid_name); 112 return; 113 } 114 } 115 /* 116 * If this oid has a number OID_AUTO, give it a number which 117 * is greater than any current oid. 118 * NOTE: DO NOT change the starting value here, change it in 119 * <sys/sysctl.h>, and make sure it is at least 256 to 120 * accomodate e.g. net.inet.raw as a static sysctl node. 121 */ 122 if (oidp->oid_number == OID_AUTO) { 123 static int newoid = CTL_AUTO_START; 124 125 oidp->oid_number = newoid++; 126 if (newoid == 0x7fffffff) 127 panic("out of oids"); 128 } 129#if 0 130 else if (oidp->oid_number >= CTL_AUTO_START) { 131 /* do not panic; this happens when unregistering sysctl sets */ 132 printf("static sysctl oid too high: %d", oidp->oid_number); 133 } 134#endif 135 136 /* 137 * Insert the oid into the parent's list in order. 138 */ 139 q = NULL; 140 SLIST_FOREACH(p, parent, oid_link) { 141 if (oidp->oid_number < p->oid_number) 142 break; 143 q = p; 144 } 145 if (q) 146 SLIST_INSERT_AFTER(q, oidp, oid_link); 147 else 148 SLIST_INSERT_HEAD(parent, oidp, oid_link); 149} 150 151void 152sysctl_unregister_oid(struct sysctl_oid *oidp) 153{ 154 struct sysctl_oid *p; 155 int error; 156 157 error = ENOENT; 158 if (oidp->oid_number == OID_AUTO) { 159 error = EINVAL; 160 } else { 161 SLIST_FOREACH(p, oidp->oid_parent, oid_link) { 162 if (p == oidp) { 163 SLIST_REMOVE(oidp->oid_parent, oidp, 164 sysctl_oid, oid_link); 165 error = 0; 166 break; 167 } 168 } 169 } 170 171 /* 172 * This can happen when a module fails to register and is 173 * being unloaded afterwards. It should not be a panic() 174 * for normal use. 175 */ 176 if (error) 177 printf("%s: failed to unregister sysctl\n", __func__); 178} 179 180/* Initialize a new context to keep track of dynamically added sysctls. */ 181int 182sysctl_ctx_init(struct sysctl_ctx_list *c) 183{ 184 185 if (c == NULL) { 186 return (EINVAL); 187 } 188 TAILQ_INIT(c); 189 return (0); 190} 191 192/* Free the context, and destroy all dynamic oids registered in this context */ 193int 194sysctl_ctx_free(struct sysctl_ctx_list *clist) 195{ 196 struct sysctl_ctx_entry *e, *e1; 197 int error; 198 199 error = 0; 200 /* 201 * First perform a "dry run" to check if it's ok to remove oids. 202 * XXX FIXME 203 * XXX This algorithm is a hack. But I don't know any 204 * XXX better solution for now... 205 */ 206 TAILQ_FOREACH(e, clist, link) { 207 error = sysctl_remove_oid(e->entry, 0, 0); 208 if (error) 209 break; 210 } 211 /* 212 * Restore deregistered entries, either from the end, 213 * or from the place where error occured. 214 * e contains the entry that was not unregistered 215 */ 216 if (error) 217 e1 = TAILQ_PREV(e, sysctl_ctx_list, link); 218 else 219 e1 = TAILQ_LAST(clist, sysctl_ctx_list); 220 while (e1 != NULL) { 221 sysctl_register_oid(e1->entry); 222 e1 = TAILQ_PREV(e1, sysctl_ctx_list, link); 223 } 224 if (error) 225 return(EBUSY); 226 /* Now really delete the entries */ 227 e = TAILQ_FIRST(clist); 228 while (e != NULL) { 229 e1 = TAILQ_NEXT(e, link); 230 error = sysctl_remove_oid(e->entry, 1, 0); 231 if (error) 232 panic("sysctl_remove_oid: corrupt tree, entry: %s", 233 e->entry->oid_name); 234 free(e, M_SYSCTLOID); 235 e = e1; 236 } 237 return (error); 238} 239 240/* Add an entry to the context */ 241struct sysctl_ctx_entry * 242sysctl_ctx_entry_add(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 243{ 244 struct sysctl_ctx_entry *e; 245 246 if (clist == NULL || oidp == NULL) 247 return(NULL); 248 e = malloc(sizeof(struct sysctl_ctx_entry), M_SYSCTLOID, M_WAITOK); 249 e->entry = oidp; 250 TAILQ_INSERT_HEAD(clist, e, link); 251 return (e); 252} 253 254/* Find an entry in the context */ 255struct sysctl_ctx_entry * 256sysctl_ctx_entry_find(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 257{ 258 struct sysctl_ctx_entry *e; 259 260 if (clist == NULL || oidp == NULL) 261 return(NULL); 262 TAILQ_FOREACH(e, clist, link) { 263 if(e->entry == oidp) 264 return(e); 265 } 266 return (e); 267} 268 269/* 270 * Delete an entry from the context. 271 * NOTE: this function doesn't free oidp! You have to remove it 272 * with sysctl_remove_oid(). 273 */ 274int 275sysctl_ctx_entry_del(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 276{ 277 struct sysctl_ctx_entry *e; 278 279 if (clist == NULL || oidp == NULL) 280 return (EINVAL); 281 e = sysctl_ctx_entry_find(clist, oidp); 282 if (e != NULL) { 283 TAILQ_REMOVE(clist, e, link); 284 free(e, M_SYSCTLOID); 285 return (0); 286 } else 287 return (ENOENT); 288} 289 290/* 291 * Remove dynamically created sysctl trees. 292 * oidp - top of the tree to be removed 293 * del - if 0 - just deregister, otherwise free up entries as well 294 * recurse - if != 0 traverse the subtree to be deleted 295 */ 296int 297sysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse) 298{ 299 struct sysctl_oid *p; 300 int error; 301 302 if (oidp == NULL) 303 return(EINVAL); 304 if ((oidp->oid_kind & CTLFLAG_DYN) == 0) { 305 printf("can't remove non-dynamic nodes!\n"); 306 return (EINVAL); 307 } 308 /* 309 * WARNING: normal method to do this should be through 310 * sysctl_ctx_free(). Use recursing as the last resort 311 * method to purge your sysctl tree of leftovers... 312 * However, if some other code still references these nodes, 313 * it will panic. 314 */ 315 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 316 if (oidp->oid_refcnt == 1) { 317 SLIST_FOREACH(p, SYSCTL_CHILDREN(oidp), oid_link) { 318 if (!recurse) 319 return (ENOTEMPTY); 320 error = sysctl_remove_oid(p, del, recurse); 321 if (error) 322 return (error); 323 } 324 if (del) 325 free(SYSCTL_CHILDREN(oidp), M_SYSCTLOID); 326 } 327 } 328 if (oidp->oid_refcnt > 1 ) { 329 oidp->oid_refcnt--; 330 } else { 331 if (oidp->oid_refcnt == 0) { 332 printf("Warning: bad oid_refcnt=%u (%s)!\n", 333 oidp->oid_refcnt, oidp->oid_name); 334 return (EINVAL); 335 } 336 sysctl_unregister_oid(oidp); 337 if (del) { 338 if (oidp->descr) 339 free((void *)(uintptr_t)(const void *)oidp->descr, M_SYSCTLOID); 340 free((void *)(uintptr_t)(const void *)oidp->oid_name, 341 M_SYSCTLOID); 342 free(oidp, M_SYSCTLOID); 343 } 344 } 345 return (0); 346} 347 348/* 349 * Create new sysctls at run time. 350 * clist may point to a valid context initialized with sysctl_ctx_init(). 351 */ 352struct sysctl_oid * 353sysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent, 354 int number, const char *name, int kind, void *arg1, int arg2, 355 int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr) 356{ 357 struct sysctl_oid *oidp; 358 ssize_t len; 359 char *newname; 360 361 /* You have to hook up somewhere.. */ 362 if (parent == NULL) 363 return(NULL); 364 /* Check if the node already exists, otherwise create it */ 365 oidp = sysctl_find_oidname(name, parent); 366 if (oidp != NULL) { 367 if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 368 oidp->oid_refcnt++; 369 /* Update the context */ 370 if (clist != NULL) 371 sysctl_ctx_entry_add(clist, oidp); 372 return (oidp); 373 } else { 374 printf("can't re-use a leaf (%s)!\n", name); 375 return (NULL); 376 } 377 } 378 oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO); 379 oidp->oid_parent = parent; 380 SLIST_NEXT(oidp, oid_link) = NULL; 381 oidp->oid_number = number; 382 oidp->oid_refcnt = 1; 383 len = strlen(name); 384 newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK); 385 bcopy(name, newname, len + 1); 386 newname[len] = '\0'; 387 oidp->oid_name = newname; 388 oidp->oid_handler = handler; 389 oidp->oid_kind = CTLFLAG_DYN | kind; 390 if ((kind & CTLTYPE) == CTLTYPE_NODE) { 391 /* Allocate space for children */ 392 SYSCTL_CHILDREN_SET(oidp, malloc(sizeof(struct sysctl_oid_list), 393 M_SYSCTLOID, M_WAITOK)); 394 SLIST_INIT(SYSCTL_CHILDREN(oidp)); 395 } else { 396 oidp->oid_arg1 = arg1; 397 oidp->oid_arg2 = arg2; 398 } 399 oidp->oid_fmt = fmt; 400 if (descr) { 401 int len = strlen(descr) + 1; 402 oidp->descr = malloc(len, M_SYSCTLOID, M_WAITOK); 403 if (oidp->descr) 404 strcpy((char *)(uintptr_t)(const void *)oidp->descr, descr); 405 } 406 /* Update the context, if used */ 407 if (clist != NULL) 408 sysctl_ctx_entry_add(clist, oidp); 409 /* Register this oid */ 410 sysctl_register_oid(oidp); 411 return (oidp); 412} 413 414/* 415 * Reparent an existing oid. 416 */ 417int 418sysctl_move_oid(struct sysctl_oid *oid, struct sysctl_oid_list *parent) 419{ 420 struct sysctl_oid *oidp; 421 422 if (oid->oid_parent == parent) 423 return (0); 424 oidp = sysctl_find_oidname(oid->oid_name, parent); 425 if (oidp != NULL) 426 return (EEXIST); 427 sysctl_unregister_oid(oid); 428 oid->oid_parent = parent; 429 oid->oid_number = OID_AUTO; 430 sysctl_register_oid(oid); 431 return (0); 432} 433 434/* 435 * Register the kernel's oids on startup. 436 */ 437SET_DECLARE(sysctl_set, struct sysctl_oid); 438 439static void 440sysctl_register_all(void *arg) 441{ 442 struct sysctl_oid **oidp; 443 444 SYSCTL_INIT(); 445 SET_FOREACH(oidp, sysctl_set) 446 sysctl_register_oid(*oidp); 447} 448SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_all, 0); 449 450/* 451 * "Staff-functions" 452 * 453 * These functions implement a presently undocumented interface 454 * used by the sysctl program to walk the tree, and get the type 455 * so it can print the value. 456 * This interface is under work and consideration, and should probably 457 * be killed with a big axe by the first person who can find the time. 458 * (be aware though, that the proper interface isn't as obvious as it 459 * may seem, there are various conflicting requirements. 460 * 461 * {0,0} printf the entire MIB-tree. 462 * {0,1,...} return the name of the "..." OID. 463 * {0,2,...} return the next OID. 464 * {0,3} return the OID of the name in "new" 465 * {0,4,...} return the kind & format info for the "..." OID. 466 * {0,5,...} return the description the "..." OID. 467 */ 468 469#ifdef SYSCTL_DEBUG 470static void 471sysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i) 472{ 473 int k; 474 struct sysctl_oid *oidp; 475 476 SLIST_FOREACH(oidp, l, oid_link) { 477 478 for (k=0; k<i; k++) 479 printf(" "); 480 481 printf("%d %s ", oidp->oid_number, oidp->oid_name); 482 483 printf("%c%c", 484 oidp->oid_kind & CTLFLAG_RD ? 'R':' ', 485 oidp->oid_kind & CTLFLAG_WR ? 'W':' '); 486 487 if (oidp->oid_handler) 488 printf(" *Handler"); 489 490 switch (oidp->oid_kind & CTLTYPE) { 491 case CTLTYPE_NODE: 492 printf(" Node\n"); 493 if (!oidp->oid_handler) { 494 sysctl_sysctl_debug_dump_node( 495 oidp->oid_arg1, i+2); 496 } 497 break; 498 case CTLTYPE_INT: printf(" Int\n"); break; 499 case CTLTYPE_STRING: printf(" String\n"); break; 500 case CTLTYPE_QUAD: printf(" Quad\n"); break; 501 case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break; 502 default: printf("\n"); 503 } 504 505 } 506} 507 508static int 509sysctl_sysctl_debug(SYSCTL_HANDLER_ARGS) 510{ 511 int error; 512 513 error = suser(req->td); 514 if (error) 515 return error; 516 sysctl_sysctl_debug_dump_node(&sysctl__children, 0); 517 return ENOENT; 518} 519 520SYSCTL_PROC(_sysctl, 0, debug, CTLTYPE_STRING|CTLFLAG_RD, 521 0, 0, sysctl_sysctl_debug, "-", ""); 522#endif 523 524static int 525sysctl_sysctl_name(SYSCTL_HANDLER_ARGS) 526{ 527 int *name = (int *) arg1; 528 u_int namelen = arg2; 529 int error = 0; 530 struct sysctl_oid *oid; 531 struct sysctl_oid_list *lsp = &sysctl__children, *lsp2; 532 char buf[10]; 533 534 while (namelen) { 535 if (!lsp) { 536 snprintf(buf,sizeof(buf),"%d",*name); 537 if (req->oldidx) 538 error = SYSCTL_OUT(req, ".", 1); 539 if (!error) 540 error = SYSCTL_OUT(req, buf, strlen(buf)); 541 if (error) 542 return (error); 543 namelen--; 544 name++; 545 continue; 546 } 547 lsp2 = 0; 548 SLIST_FOREACH(oid, lsp, oid_link) { 549 if (oid->oid_number != *name) 550 continue; 551 552 if (req->oldidx) 553 error = SYSCTL_OUT(req, ".", 1); 554 if (!error) 555 error = SYSCTL_OUT(req, oid->oid_name, 556 strlen(oid->oid_name)); 557 if (error) 558 return (error); 559 560 namelen--; 561 name++; 562 563 if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE) 564 break; 565 566 if (oid->oid_handler) 567 break; 568 569 lsp2 = (struct sysctl_oid_list *)oid->oid_arg1; 570 break; 571 } 572 lsp = lsp2; 573 } 574 return (SYSCTL_OUT(req, "", 1)); 575} 576 577SYSCTL_NODE(_sysctl, 1, name, CTLFLAG_RD, sysctl_sysctl_name, ""); 578 579static int 580sysctl_sysctl_next_ls(struct sysctl_oid_list *lsp, int *name, u_int namelen, 581 int *next, int *len, int level, struct sysctl_oid **oidpp) 582{ 583 struct sysctl_oid *oidp; 584 585 *len = level; 586 SLIST_FOREACH(oidp, lsp, oid_link) { 587 *next = oidp->oid_number; 588 *oidpp = oidp; 589 590 if (oidp->oid_kind & CTLFLAG_SKIP) 591 continue; 592 593 if (!namelen) { 594 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 595 return 0; 596 if (oidp->oid_handler) 597 /* We really should call the handler here...*/ 598 return 0; 599 lsp = (struct sysctl_oid_list *)oidp->oid_arg1; 600 if (!sysctl_sysctl_next_ls(lsp, 0, 0, next+1, 601 len, level+1, oidpp)) 602 return 0; 603 goto emptynode; 604 } 605 606 if (oidp->oid_number < *name) 607 continue; 608 609 if (oidp->oid_number > *name) { 610 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 611 return 0; 612 if (oidp->oid_handler) 613 return 0; 614 lsp = (struct sysctl_oid_list *)oidp->oid_arg1; 615 if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, 616 next+1, len, level+1, oidpp)) 617 return (0); 618 goto next; 619 } 620 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 621 continue; 622 623 if (oidp->oid_handler) 624 continue; 625 626 lsp = (struct sysctl_oid_list *)oidp->oid_arg1; 627 if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, next+1, 628 len, level+1, oidpp)) 629 return (0); 630 next: 631 namelen = 1; 632 emptynode: 633 *len = level; 634 } 635 return 1; 636} 637 638static int 639sysctl_sysctl_next(SYSCTL_HANDLER_ARGS) 640{ 641 int *name = (int *) arg1; 642 u_int namelen = arg2; 643 int i, j, error; 644 struct sysctl_oid *oid; 645 struct sysctl_oid_list *lsp = &sysctl__children; 646 int newoid[CTL_MAXNAME]; 647 648 i = sysctl_sysctl_next_ls(lsp, name, namelen, newoid, &j, 1, &oid); 649 if (i) 650 return ENOENT; 651 error = SYSCTL_OUT(req, newoid, j * sizeof (int)); 652 return (error); 653} 654 655SYSCTL_NODE(_sysctl, 2, next, CTLFLAG_RD, sysctl_sysctl_next, ""); 656 657static int 658name2oid (char *name, int *oid, int *len, struct sysctl_oid **oidpp) 659{ 660 int i; 661 struct sysctl_oid *oidp; 662 struct sysctl_oid_list *lsp = &sysctl__children; 663 char *p; 664 665 if (!*name) 666 return ENOENT; 667 668 p = name + strlen(name) - 1 ; 669 if (*p == '.') 670 *p = '\0'; 671 672 *len = 0; 673 674 for (p = name; *p && *p != '.'; p++) 675 ; 676 i = *p; 677 if (i == '.') 678 *p = '\0'; 679 680 oidp = SLIST_FIRST(lsp); 681 682 while (oidp && *len < CTL_MAXNAME) { 683 if (strcmp(name, oidp->oid_name)) { 684 oidp = SLIST_NEXT(oidp, oid_link); 685 continue; 686 } 687 *oid++ = oidp->oid_number; 688 (*len)++; 689 690 if (!i) { 691 if (oidpp) 692 *oidpp = oidp; 693 return (0); 694 } 695 696 if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 697 break; 698 699 if (oidp->oid_handler) 700 break; 701 702 lsp = (struct sysctl_oid_list *)oidp->oid_arg1; 703 oidp = SLIST_FIRST(lsp); 704 name = p+1; 705 for (p = name; *p && *p != '.'; p++) 706 ; 707 i = *p; 708 if (i == '.') 709 *p = '\0'; 710 } 711 return ENOENT; 712} 713 714static int 715sysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS) 716{ 717 char *p; 718 int error, oid[CTL_MAXNAME], len; 719 struct sysctl_oid *op = 0; 720 721 if (!req->newlen) 722 return ENOENT; 723 if (req->newlen >= MAXPATHLEN) /* XXX arbitrary, undocumented */ 724 return (ENAMETOOLONG); 725 726 p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK); 727 728 error = SYSCTL_IN(req, p, req->newlen); 729 if (error) { 730 free(p, M_SYSCTL); 731 return (error); 732 } 733 734 p [req->newlen] = '\0'; 735 736 error = name2oid(p, oid, &len, &op); 737 738 free(p, M_SYSCTL); 739 740 if (error) 741 return (error); 742 743 error = SYSCTL_OUT(req, oid, len * sizeof *oid); 744 return (error); 745} 746 747SYSCTL_PROC(_sysctl, 3, name2oid, CTLFLAG_RW|CTLFLAG_ANYBODY, 0, 0, 748 sysctl_sysctl_name2oid, "I", ""); 749 750static int 751sysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS) 752{ 753 struct sysctl_oid *oid; 754 int error; 755 756 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 757 if (error) 758 return (error); 759 760 if (!oid->oid_fmt) 761 return (ENOENT); 762 error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind)); 763 if (error) 764 return (error); 765 error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1); 766 return (error); 767} 768 769 770SYSCTL_NODE(_sysctl, 4, oidfmt, CTLFLAG_RD, sysctl_sysctl_oidfmt, ""); 771 772static int 773sysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS) 774{ 775 struct sysctl_oid *oid; 776 int error; 777 778 error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 779 if (error) 780 return (error); 781 782 if (!oid->descr) 783 return (ENOENT); 784 error = SYSCTL_OUT(req, oid->descr, strlen(oid->descr) + 1); 785 return (error); 786} 787 788SYSCTL_NODE(_sysctl, 5, oiddescr, CTLFLAG_RD, sysctl_sysctl_oiddescr, ""); 789 790/* 791 * Default "handler" functions. 792 */ 793 794/* 795 * Handle an int, signed or unsigned. 796 * Two cases: 797 * a variable: point arg1 at it. 798 * a constant: pass it in arg2. 799 */ 800 801int 802sysctl_handle_int(SYSCTL_HANDLER_ARGS) 803{ 804 int tmpout, error = 0; 805 806 /* 807 * Attempt to get a coherent snapshot by making a copy of the data. 808 */ 809 if (arg1) 810 tmpout = *(int *)arg1; 811 else 812 tmpout = arg2; 813 error = SYSCTL_OUT(req, &tmpout, sizeof(int)); 814 815 if (error || !req->newptr) 816 return (error); 817 818 if (!arg1) 819 error = EPERM; 820 else 821 error = SYSCTL_IN(req, arg1, sizeof(int)); 822 return (error); 823} 824 825/* 826 * Handle a long, signed or unsigned. arg1 points to it. 827 */ 828 829int 830sysctl_handle_long(SYSCTL_HANDLER_ARGS) 831{ 832 int error = 0; 833 long tmplong; 834#ifdef SCTL_MASK32 835 int tmpint; 836#endif 837 838 /* 839 * Attempt to get a coherent snapshot by making a copy of the data. 840 */ 841 if (!arg1) 842 return (EINVAL); 843 tmplong = *(long *)arg1; 844#ifdef SCTL_MASK32 845 if (req->flags & SCTL_MASK32) { 846 tmpint = tmplong; 847 error = SYSCTL_OUT(req, &tmpint, sizeof(int)); 848 } else 849#endif 850 error = SYSCTL_OUT(req, &tmplong, sizeof(long)); 851 852 if (error || !req->newptr) 853 return (error); 854 855#ifdef SCTL_MASK32 856 if (req->flags & SCTL_MASK32) { 857 error = SYSCTL_IN(req, &tmpint, sizeof(int)); 858 *(long *)arg1 = (long)tmpint; 859 } else 860#endif 861 error = SYSCTL_IN(req, arg1, sizeof(long)); 862 return (error); 863} 864 865/* 866 * Handle our generic '\0' terminated 'C' string. 867 * Two cases: 868 * a variable string: point arg1 at it, arg2 is max length. 869 * a constant string: point arg1 at it, arg2 is zero. 870 */ 871 872int 873sysctl_handle_string(SYSCTL_HANDLER_ARGS) 874{ 875 int error=0; 876 char *tmparg; 877 size_t outlen; 878 879 /* 880 * Attempt to get a coherent snapshot by copying to a 881 * temporary kernel buffer. 882 */ 883retry: 884 outlen = strlen((char *)arg1)+1; 885 tmparg = malloc(outlen, M_SYSCTLTMP, M_WAITOK); 886 887 if (strlcpy(tmparg, (char *)arg1, outlen) >= outlen) { 888 free(tmparg, M_SYSCTLTMP); 889 goto retry; 890 } 891 892 error = SYSCTL_OUT(req, tmparg, outlen); 893 free(tmparg, M_SYSCTLTMP); 894 895 if (error || !req->newptr) 896 return (error); 897 898 if ((req->newlen - req->newidx) >= arg2) { 899 error = EINVAL; 900 } else { 901 arg2 = (req->newlen - req->newidx); 902 error = SYSCTL_IN(req, arg1, arg2); 903 ((char *)arg1)[arg2] = '\0'; 904 } 905 906 return (error); 907} 908 909/* 910 * Handle any kind of opaque data. 911 * arg1 points to it, arg2 is the size. 912 */ 913 914int 915sysctl_handle_opaque(SYSCTL_HANDLER_ARGS) 916{ 917 int error, tries; 918 u_int generation; 919 struct sysctl_req req2; 920 921 /* 922 * Attempt to get a coherent snapshot, by using the thread 923 * pre-emption counter updated from within mi_switch() to 924 * determine if we were pre-empted during a bcopy() or 925 * copyout(). Make 3 attempts at doing this before giving up. 926 * If we encounter an error, stop immediately. 927 */ 928 tries = 0; 929 req2 = *req; 930retry: 931 generation = curthread->td_generation; 932 error = SYSCTL_OUT(req, arg1, arg2); 933 if (error) 934 return (error); 935 tries++; 936 if (generation != curthread->td_generation && tries < 3) { 937 *req = req2; 938 goto retry; 939 } 940 941 error = SYSCTL_IN(req, arg1, arg2); 942 943 return (error); 944} 945 946/* 947 * Transfer functions to/from kernel space. 948 * XXX: rather untested at this point 949 */ 950static int 951sysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l) 952{ 953 size_t i = 0; 954 955 if (req->oldptr) { 956 i = l; 957 if (req->oldlen <= req->oldidx) 958 i = 0; 959 else 960 if (i > req->oldlen - req->oldidx) 961 i = req->oldlen - req->oldidx; 962 if (i > 0) 963 bcopy(p, (char *)req->oldptr + req->oldidx, i); 964 } 965 req->oldidx += l; 966 if (req->oldptr && i != l) 967 return (ENOMEM); 968 return (0); 969} 970 971static int 972sysctl_new_kernel(struct sysctl_req *req, void *p, size_t l) 973{ 974 if (!req->newptr) 975 return 0; 976 if (req->newlen - req->newidx < l) 977 return (EINVAL); 978 bcopy((char *)req->newptr + req->newidx, p, l); 979 req->newidx += l; 980 return (0); 981} 982 983int 984kernel_sysctl(struct thread *td, int *name, u_int namelen, void *old, 985 size_t *oldlenp, void *new, size_t newlen, size_t *retval, int flags) 986{ 987 int error = 0; 988 struct sysctl_req req; 989 990 bzero(&req, sizeof req); 991 992 req.td = td; 993 req.flags = flags; 994 995 if (oldlenp) { 996 req.oldlen = *oldlenp; 997 } 998 req.validlen = req.oldlen; 999 1000 if (old) { 1001 req.oldptr= old; 1002 } 1003 1004 if (new != NULL) { 1005 req.newlen = newlen; 1006 req.newptr = new; 1007 } 1008 1009 req.oldfunc = sysctl_old_kernel; 1010 req.newfunc = sysctl_new_kernel; 1011 req.lock = REQ_LOCKED; 1012 1013 SYSCTL_LOCK(); 1014 1015 error = sysctl_root(0, name, namelen, &req); 1016 1017 if (req.lock == REQ_WIRED && req.validlen > 0) 1018 vsunlock(req.oldptr, req.validlen); 1019 1020 SYSCTL_UNLOCK(); 1021 1022 if (error && error != ENOMEM) 1023 return (error); 1024 1025 if (retval) { 1026 if (req.oldptr && req.oldidx > req.validlen) 1027 *retval = req.validlen; 1028 else 1029 *retval = req.oldidx; 1030 } 1031 return (error); 1032} 1033 1034int 1035kernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp, 1036 void *new, size_t newlen, size_t *retval, int flags) 1037{ 1038 int oid[CTL_MAXNAME]; 1039 size_t oidlen, plen; 1040 int error; 1041 1042 oid[0] = 0; /* sysctl internal magic */ 1043 oid[1] = 3; /* name2oid */ 1044 oidlen = sizeof(oid); 1045 1046 error = kernel_sysctl(td, oid, 2, oid, &oidlen, 1047 (void *)name, strlen(name), &plen, flags); 1048 if (error) 1049 return (error); 1050 1051 error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp, 1052 new, newlen, retval, flags); 1053 return (error); 1054} 1055 1056/* 1057 * Transfer function to/from user space. 1058 */ 1059static int 1060sysctl_old_user(struct sysctl_req *req, const void *p, size_t l) 1061{ 1062 int error = 0; 1063 size_t i, len, origidx; 1064 1065 origidx = req->oldidx; 1066 req->oldidx += l; 1067 if (req->oldptr == NULL) 1068 return (0); 1069 if (req->lock == REQ_LOCKED) 1070 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1071 "sysctl_old_user()"); 1072 i = l; 1073 len = req->validlen; 1074 if (len <= origidx) 1075 i = 0; 1076 else { 1077 if (i > len - origidx) 1078 i = len - origidx; 1079 error = copyout(p, (char *)req->oldptr + origidx, i); 1080 } 1081 if (error) 1082 return (error); 1083 if (i < l) 1084 return (ENOMEM); 1085 return (0); 1086} 1087 1088static int 1089sysctl_new_user(struct sysctl_req *req, void *p, size_t l) 1090{ 1091 int error; 1092 1093 if (!req->newptr) 1094 return 0; 1095 if (req->newlen - req->newidx < l) 1096 return (EINVAL); 1097 error = copyin((char *)req->newptr + req->newidx, p, l); 1098 req->newidx += l; 1099 return (error); 1100} 1101 1102/* 1103 * Wire the user space destination buffer. If set to a value greater than 1104 * zero, the len parameter limits the maximum amount of wired memory. 1105 * 1106 * XXX - The len parameter is currently ignored due to the lack of 1107 * a place to save it in the sysctl_req structure so that the matching 1108 * amount of memory can be unwired in the sysctl exit code. 1109 */ 1110int 1111sysctl_wire_old_buffer(struct sysctl_req *req, size_t len) 1112{ 1113 int ret; 1114 size_t wiredlen; 1115 1116 wiredlen = (len > 0 && len < req->oldlen) ? len : req->oldlen; 1117 ret = 0; 1118 if (req->lock == REQ_LOCKED && req->oldptr && 1119 req->oldfunc == sysctl_old_user) { 1120 if (wiredlen != 0) { 1121 ret = vslock(req->oldptr, wiredlen); 1122 if (ret != 0) { 1123 if (ret != ENOMEM) 1124 return (ret); 1125 wiredlen = 0; 1126 } 1127 } 1128 req->lock = REQ_WIRED; 1129 req->validlen = wiredlen; 1130 } 1131 return (0); 1132} 1133 1134int 1135sysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid, 1136 int *nindx, struct sysctl_req *req) 1137{ 1138 struct sysctl_oid *oid; 1139 int indx; 1140 1141 oid = SLIST_FIRST(&sysctl__children); 1142 indx = 0; 1143 while (oid && indx < CTL_MAXNAME) { 1144 if (oid->oid_number == name[indx]) { 1145 indx++; 1146 if (oid->oid_kind & CTLFLAG_NOLOCK) 1147 req->lock = REQ_UNLOCKED; 1148 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 1149 if (oid->oid_handler != NULL || 1150 indx == namelen) { 1151 *noid = oid; 1152 if (nindx != NULL) 1153 *nindx = indx; 1154 return (0); 1155 } 1156 oid = SLIST_FIRST( 1157 (struct sysctl_oid_list *)oid->oid_arg1); 1158 } else if (indx == namelen) { 1159 *noid = oid; 1160 if (nindx != NULL) 1161 *nindx = indx; 1162 return (0); 1163 } else { 1164 return (ENOTDIR); 1165 } 1166 } else { 1167 oid = SLIST_NEXT(oid, oid_link); 1168 } 1169 } 1170 return (ENOENT); 1171} 1172 1173/* 1174 * Traverse our tree, and find the right node, execute whatever it points 1175 * to, and return the resulting error code. 1176 */ 1177 1178static int 1179sysctl_root(SYSCTL_HANDLER_ARGS) 1180{ 1181 struct sysctl_oid *oid; 1182 int error, indx, lvl; 1183 1184 error = sysctl_find_oid(arg1, arg2, &oid, &indx, req); 1185 if (error) 1186 return (error); 1187 1188 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 1189 /* 1190 * You can't call a sysctl when it's a node, but has 1191 * no handler. Inform the user that it's a node. 1192 * The indx may or may not be the same as namelen. 1193 */ 1194 if (oid->oid_handler == NULL) 1195 return (EISDIR); 1196 } 1197 1198 /* Is this sysctl writable? */ 1199 if (req->newptr && !(oid->oid_kind & CTLFLAG_WR)) 1200 return (EPERM); 1201 1202 KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL")); 1203 1204 /* Is this sysctl sensitive to securelevels? */ 1205 if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) { 1206 lvl = (oid->oid_kind & CTLMASK_SECURE) >> CTLSHIFT_SECURE; 1207 error = securelevel_gt(req->td->td_ucred, lvl); 1208 if (error) 1209 return (error); 1210 } 1211 1212 /* Is this sysctl writable by only privileged users? */ 1213 if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) { 1214 int flags; 1215 1216 if (oid->oid_kind & CTLFLAG_PRISON) 1217 flags = SUSER_ALLOWJAIL; 1218 else 1219 flags = 0; 1220 error = suser_cred(req->td->td_ucred, flags); 1221 if (error) 1222 return (error); 1223 } 1224 1225 if (!oid->oid_handler) 1226 return EINVAL; 1227 1228 if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 1229 arg1 = (int *)arg1 + indx; 1230 arg2 -= indx; 1231 } else { 1232 arg1 = oid->oid_arg1; 1233 arg2 = oid->oid_arg2; 1234 } 1235#ifdef MAC 1236 error = mac_check_system_sysctl(req->td->td_ucred, oid, arg1, arg2, 1237 req); 1238 if (error != 0) 1239 return (error); 1240#endif 1241 error = oid->oid_handler(oid, arg1, arg2, req); 1242 1243 return (error); 1244} 1245 1246#ifndef _SYS_SYSPROTO_H_ 1247struct sysctl_args { 1248 int *name; 1249 u_int namelen; 1250 void *old; 1251 size_t *oldlenp; 1252 void *new; 1253 size_t newlen; 1254}; 1255#endif 1256 1257/* 1258 * MPSAFE 1259 */ 1260int 1261__sysctl(struct thread *td, struct sysctl_args *uap) 1262{ 1263 int error, name[CTL_MAXNAME]; 1264 size_t j; 1265 1266 if (uap->namelen > CTL_MAXNAME || uap->namelen < 2) 1267 return (EINVAL); 1268 1269 error = copyin(uap->name, &name, uap->namelen * sizeof(int)); 1270 if (error) 1271 return (error); 1272 1273 mtx_lock(&Giant); 1274 1275 error = userland_sysctl(td, name, uap->namelen, 1276 uap->old, uap->oldlenp, 0, 1277 uap->new, uap->newlen, &j, 0); 1278 if (error && error != ENOMEM) 1279 goto done2; 1280 if (uap->oldlenp) { 1281 int i = copyout(&j, uap->oldlenp, sizeof(j)); 1282 if (i) 1283 error = i; 1284 } 1285done2: 1286 mtx_unlock(&Giant); 1287 return (error); 1288} 1289 1290/* 1291 * This is used from various compatibility syscalls too. That's why name 1292 * must be in kernel space. 1293 */ 1294int 1295userland_sysctl(struct thread *td, int *name, u_int namelen, void *old, 1296 size_t *oldlenp, int inkernel, void *new, size_t newlen, size_t *retval, 1297 int flags) 1298{ 1299 int error = 0; 1300 struct sysctl_req req; 1301 1302 bzero(&req, sizeof req); 1303 1304 req.td = td; 1305 req.flags = flags; 1306 1307 if (oldlenp) { 1308 if (inkernel) { 1309 req.oldlen = *oldlenp; 1310 } else { 1311 error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp)); 1312 if (error) 1313 return (error); 1314 } 1315 } 1316 req.validlen = req.oldlen; 1317 1318 if (old) { 1319 if (!useracc(old, req.oldlen, VM_PROT_WRITE)) 1320 return (EFAULT); 1321 req.oldptr= old; 1322 } 1323 1324 if (new != NULL) { 1325 if (!useracc(new, req.newlen, VM_PROT_READ)) 1326 return (EFAULT); 1327 req.newlen = newlen; 1328 req.newptr = new; 1329 } 1330 1331 req.oldfunc = sysctl_old_user; 1332 req.newfunc = sysctl_new_user; 1333 req.lock = REQ_LOCKED; 1334 1335 SYSCTL_LOCK(); 1336 1337 do { 1338 req.oldidx = 0; 1339 req.newidx = 0; 1340 error = sysctl_root(0, name, namelen, &req); 1341 } while (error == EAGAIN); 1342 1343 if (req.lock == REQ_WIRED && req.validlen > 0) 1344 vsunlock(req.oldptr, req.validlen); 1345 1346 SYSCTL_UNLOCK(); 1347 1348 if (error && error != ENOMEM) 1349 return (error); 1350 1351 if (retval) { 1352 if (req.oldptr && req.oldidx > req.validlen) 1353 *retval = req.validlen; 1354 else 1355 *retval = req.oldidx; 1356 } 1357 return (error); 1358} 1359 1360#ifdef COMPAT_43 1361#include <sys/socket.h> 1362#include <vm/vm_param.h> 1363 1364#define KINFO_PROC (0<<8) 1365#define KINFO_RT (1<<8) 1366#define KINFO_VNODE (2<<8) 1367#define KINFO_FILE (3<<8) 1368#define KINFO_METER (4<<8) 1369#define KINFO_LOADAVG (5<<8) 1370#define KINFO_CLOCKRATE (6<<8) 1371 1372/* Non-standard BSDI extension - only present on their 4.3 net-2 releases */ 1373#define KINFO_BSDI_SYSINFO (101<<8) 1374 1375/* 1376 * XXX this is bloat, but I hope it's better here than on the potentially 1377 * limited kernel stack... -Peter 1378 */ 1379 1380static struct { 1381 int bsdi_machine; /* "i386" on BSD/386 */ 1382/* ^^^ this is an offset to the string, relative to the struct start */ 1383 char *pad0; 1384 long pad1; 1385 long pad2; 1386 long pad3; 1387 u_long pad4; 1388 u_long pad5; 1389 u_long pad6; 1390 1391 int bsdi_ostype; /* "BSD/386" on BSD/386 */ 1392 int bsdi_osrelease; /* "1.1" on BSD/386 */ 1393 long pad7; 1394 long pad8; 1395 char *pad9; 1396 1397 long pad10; 1398 long pad11; 1399 int pad12; 1400 long pad13; 1401 quad_t pad14; 1402 long pad15; 1403 1404 struct timeval pad16; 1405 /* we dont set this, because BSDI's uname used gethostname() instead */ 1406 int bsdi_hostname; /* hostname on BSD/386 */ 1407 1408 /* the actual string data is appended here */ 1409 1410} bsdi_si; 1411/* 1412 * this data is appended to the end of the bsdi_si structure during copyout. 1413 * The "char *" offsets are relative to the base of the bsdi_si struct. 1414 * This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings 1415 * should not exceed the length of the buffer here... (or else!! :-) 1416 */ 1417static char bsdi_strings[80]; /* It had better be less than this! */ 1418 1419#ifndef _SYS_SYSPROTO_H_ 1420struct getkerninfo_args { 1421 int op; 1422 char *where; 1423 size_t *size; 1424 int arg; 1425}; 1426#endif 1427 1428/* 1429 * MPSAFE 1430 */ 1431int 1432ogetkerninfo(struct thread *td, struct getkerninfo_args *uap) 1433{ 1434 int error, name[6]; 1435 size_t size; 1436 u_int needed = 0; 1437 1438 mtx_lock(&Giant); 1439 1440 switch (uap->op & 0xff00) { 1441 1442 case KINFO_RT: 1443 name[0] = CTL_NET; 1444 name[1] = PF_ROUTE; 1445 name[2] = 0; 1446 name[3] = (uap->op & 0xff0000) >> 16; 1447 name[4] = uap->op & 0xff; 1448 name[5] = uap->arg; 1449 error = userland_sysctl(td, name, 6, uap->where, uap->size, 1450 0, 0, 0, &size, 0); 1451 break; 1452 1453 case KINFO_VNODE: 1454 name[0] = CTL_KERN; 1455 name[1] = KERN_VNODE; 1456 error = userland_sysctl(td, name, 2, uap->where, uap->size, 1457 0, 0, 0, &size, 0); 1458 break; 1459 1460 case KINFO_PROC: 1461 name[0] = CTL_KERN; 1462 name[1] = KERN_PROC; 1463 name[2] = uap->op & 0xff; 1464 name[3] = uap->arg; 1465 error = userland_sysctl(td, name, 4, uap->where, uap->size, 1466 0, 0, 0, &size, 0); 1467 break; 1468 1469 case KINFO_FILE: 1470 name[0] = CTL_KERN; 1471 name[1] = KERN_FILE; 1472 error = userland_sysctl(td, name, 2, uap->where, uap->size, 1473 0, 0, 0, &size, 0); 1474 break; 1475 1476 case KINFO_METER: 1477 name[0] = CTL_VM; 1478 name[1] = VM_TOTAL; 1479 error = userland_sysctl(td, name, 2, uap->where, uap->size, 1480 0, 0, 0, &size, 0); 1481 break; 1482 1483 case KINFO_LOADAVG: 1484 name[0] = CTL_VM; 1485 name[1] = VM_LOADAVG; 1486 error = userland_sysctl(td, name, 2, uap->where, uap->size, 1487 0, 0, 0, &size, 0); 1488 break; 1489 1490 case KINFO_CLOCKRATE: 1491 name[0] = CTL_KERN; 1492 name[1] = KERN_CLOCKRATE; 1493 error = userland_sysctl(td, name, 2, uap->where, uap->size, 1494 0, 0, 0, &size, 0); 1495 break; 1496 1497 case KINFO_BSDI_SYSINFO: { 1498 /* 1499 * this is pretty crude, but it's just enough for uname() 1500 * from BSDI's 1.x libc to work. 1501 * 1502 * *size gives the size of the buffer before the call, and 1503 * the amount of data copied after a successful call. 1504 * If successful, the return value is the amount of data 1505 * available, which can be larger than *size. 1506 * 1507 * BSDI's 2.x product apparently fails with ENOMEM if *size 1508 * is too small. 1509 */ 1510 1511 u_int left; 1512 char *s; 1513 1514 bzero((char *)&bsdi_si, sizeof(bsdi_si)); 1515 bzero(bsdi_strings, sizeof(bsdi_strings)); 1516 1517 s = bsdi_strings; 1518 1519 bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si); 1520 strcpy(s, ostype); 1521 s += strlen(s) + 1; 1522 1523 bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si); 1524 strcpy(s, osrelease); 1525 s += strlen(s) + 1; 1526 1527 bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si); 1528 strcpy(s, machine); 1529 s += strlen(s) + 1; 1530 1531 needed = sizeof(bsdi_si) + (s - bsdi_strings); 1532 1533 if ((uap->where == NULL) || (uap->size == NULL)) { 1534 /* process is asking how much buffer to supply.. */ 1535 size = needed; 1536 error = 0; 1537 break; 1538 } 1539 1540 if ((error = copyin(uap->size, &size, sizeof(size))) != 0) 1541 break; 1542 1543 /* if too much buffer supplied, trim it down */ 1544 if (size > needed) 1545 size = needed; 1546 1547 /* how much of the buffer is remaining */ 1548 left = size; 1549 1550 if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0) 1551 break; 1552 1553 /* is there any point in continuing? */ 1554 if (left > sizeof(bsdi_si)) { 1555 left -= sizeof(bsdi_si); 1556 error = copyout(&bsdi_strings, 1557 uap->where + sizeof(bsdi_si), left); 1558 } 1559 break; 1560 } 1561 1562 default: 1563 error = EOPNOTSUPP; 1564 break; 1565 } 1566 if (error == 0) { 1567 td->td_retval[0] = needed ? needed : size; 1568 if (uap->size) { 1569 error = copyout(&size, uap->size, sizeof(size)); 1570 } 1571 } 1572 mtx_unlock(&Giant); 1573 return (error); 1574} 1575#endif /* COMPAT_43 */ 1576