FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_xxx.c
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)kern_xxx.c 8.2 (Berkeley) 11/14/93
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD: releng/12.0/sys/kern/kern_xxx.c 332122 2018-04-06 17:35:35Z brooks $");
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/sysproto.h>
40 #include <sys/kernel.h>
41 #include <sys/priv.h>
42 #include <sys/proc.h>
43 #include <sys/lock.h>
44 #include <sys/mutex.h>
45 #include <sys/socket.h>
46 #include <sys/sysctl.h>
47 #include <sys/utsname.h>
48
49 #include <vm/vm_param.h>
50
51 #if defined(COMPAT_43)
52
53 #ifndef _SYS_SYSPROTO_H_
54 struct gethostname_args {
55 char *hostname;
56 u_int len;
57 };
58 #endif
59 /* ARGSUSED */
60 int
61 ogethostname(struct thread *td, struct gethostname_args *uap)
62 {
63 int name[2];
64 size_t len = uap->len;
65
66 name[0] = CTL_KERN;
67 name[1] = KERN_HOSTNAME;
68 return (userland_sysctl(td, name, 2, uap->hostname, &len,
69 1, 0, 0, 0, 0));
70 }
71
72 #ifndef _SYS_SYSPROTO_H_
73 struct sethostname_args {
74 char *hostname;
75 u_int len;
76 };
77 #endif
78 /* ARGSUSED */
79 int
80 osethostname(struct thread *td, struct sethostname_args *uap)
81 {
82 int name[2];
83
84 name[0] = CTL_KERN;
85 name[1] = KERN_HOSTNAME;
86 return (userland_sysctl(td, name, 2, 0, 0, 0, uap->hostname,
87 uap->len, 0, 0));
88 }
89
90 #ifndef _SYS_SYSPROTO_H_
91 struct ogethostid_args {
92 int dummy;
93 };
94 #endif
95 /* ARGSUSED */
96 int
97 ogethostid(struct thread *td, struct ogethostid_args *uap)
98 {
99 size_t len = sizeof(long);
100 int name[2];
101
102 name[0] = CTL_KERN;
103 name[1] = KERN_HOSTID;
104 return (kernel_sysctl(td, name, 2, (long *)td->td_retval, &len,
105 NULL, 0, NULL, 0));
106 }
107 #endif /* COMPAT_43 */
108
109 #ifdef COMPAT_43
110 #ifndef _SYS_SYSPROTO_H_
111 struct osethostid_args {
112 long hostid;
113 };
114 #endif
115 /* ARGSUSED */
116 int
117 osethostid(struct thread *td, struct osethostid_args *uap)
118 {
119 int name[2];
120
121 name[0] = CTL_KERN;
122 name[1] = KERN_HOSTID;
123 return (kernel_sysctl(td, name, 2, NULL, NULL, &uap->hostid,
124 sizeof(uap->hostid), NULL, 0));
125 }
126
127 int
128 oquota(struct thread *td, struct oquota_args *uap)
129 {
130
131 return (ENOSYS);
132 }
133
134 #define KINFO_PROC (0<<8)
135 #define KINFO_RT (1<<8)
136 #define KINFO_VNODE (2<<8)
137 #define KINFO_FILE (3<<8)
138 #define KINFO_METER (4<<8)
139 #define KINFO_LOADAVG (5<<8)
140 #define KINFO_CLOCKRATE (6<<8)
141
142 /* Non-standard BSDI extension - only present on their 4.3 net-2 releases */
143 #define KINFO_BSDI_SYSINFO (101<<8)
144
145 /*
146 * XXX this is bloat, but I hope it's better here than on the potentially
147 * limited kernel stack... -Peter
148 */
149
150 static struct {
151 int bsdi_machine; /* "i386" on BSD/386 */
152 /* ^^^ this is an offset to the string, relative to the struct start */
153 char *pad0;
154 long pad1;
155 long pad2;
156 long pad3;
157 u_long pad4;
158 u_long pad5;
159 u_long pad6;
160
161 int bsdi_ostype; /* "BSD/386" on BSD/386 */
162 int bsdi_osrelease; /* "1.1" on BSD/386 */
163 long pad7;
164 long pad8;
165 char *pad9;
166
167 long pad10;
168 long pad11;
169 int pad12;
170 long pad13;
171 quad_t pad14;
172 long pad15;
173
174 struct timeval pad16;
175 /* we dont set this, because BSDI's uname used gethostname() instead */
176 int bsdi_hostname; /* hostname on BSD/386 */
177
178 /* the actual string data is appended here */
179
180 } bsdi_si;
181
182 /*
183 * this data is appended to the end of the bsdi_si structure during copyout.
184 * The "char *" offsets are relative to the base of the bsdi_si struct.
185 * This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings
186 * should not exceed the length of the buffer here... (or else!! :-)
187 */
188 static char bsdi_strings[80]; /* It had better be less than this! */
189
190 #ifndef _SYS_SYSPROTO_H_
191 struct getkerninfo_args {
192 int op;
193 char *where;
194 size_t *size;
195 int arg;
196 };
197 #endif
198 int
199 ogetkerninfo(struct thread *td, struct getkerninfo_args *uap)
200 {
201 int error, name[6];
202 size_t size;
203 u_int needed = 0;
204
205 switch (uap->op & 0xff00) {
206
207 case KINFO_RT:
208 name[0] = CTL_NET;
209 name[1] = PF_ROUTE;
210 name[2] = 0;
211 name[3] = (uap->op & 0xff0000) >> 16;
212 name[4] = uap->op & 0xff;
213 name[5] = uap->arg;
214 error = userland_sysctl(td, name, 6, uap->where, uap->size,
215 0, 0, 0, &size, 0);
216 break;
217
218 case KINFO_VNODE:
219 name[0] = CTL_KERN;
220 name[1] = KERN_VNODE;
221 error = userland_sysctl(td, name, 2, uap->where, uap->size,
222 0, 0, 0, &size, 0);
223 break;
224
225 case KINFO_PROC:
226 name[0] = CTL_KERN;
227 name[1] = KERN_PROC;
228 name[2] = uap->op & 0xff;
229 name[3] = uap->arg;
230 error = userland_sysctl(td, name, 4, uap->where, uap->size,
231 0, 0, 0, &size, 0);
232 break;
233
234 case KINFO_FILE:
235 name[0] = CTL_KERN;
236 name[1] = KERN_FILE;
237 error = userland_sysctl(td, name, 2, uap->where, uap->size,
238 0, 0, 0, &size, 0);
239 break;
240
241 case KINFO_METER:
242 name[0] = CTL_VM;
243 name[1] = VM_TOTAL;
244 error = userland_sysctl(td, name, 2, uap->where, uap->size,
245 0, 0, 0, &size, 0);
246 break;
247
248 case KINFO_LOADAVG:
249 name[0] = CTL_VM;
250 name[1] = VM_LOADAVG;
251 error = userland_sysctl(td, name, 2, uap->where, uap->size,
252 0, 0, 0, &size, 0);
253 break;
254
255 case KINFO_CLOCKRATE:
256 name[0] = CTL_KERN;
257 name[1] = KERN_CLOCKRATE;
258 error = userland_sysctl(td, name, 2, uap->where, uap->size,
259 0, 0, 0, &size, 0);
260 break;
261
262 case KINFO_BSDI_SYSINFO: {
263 /*
264 * this is pretty crude, but it's just enough for uname()
265 * from BSDI's 1.x libc to work.
266 *
267 * *size gives the size of the buffer before the call, and
268 * the amount of data copied after a successful call.
269 * If successful, the return value is the amount of data
270 * available, which can be larger than *size.
271 *
272 * BSDI's 2.x product apparently fails with ENOMEM if *size
273 * is too small.
274 */
275
276 u_int left;
277 char *s;
278
279 bzero((char *)&bsdi_si, sizeof(bsdi_si));
280 bzero(bsdi_strings, sizeof(bsdi_strings));
281
282 s = bsdi_strings;
283
284 bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si);
285 strcpy(s, ostype);
286 s += strlen(s) + 1;
287
288 bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si);
289 strcpy(s, osrelease);
290 s += strlen(s) + 1;
291
292 bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si);
293 strcpy(s, machine);
294 s += strlen(s) + 1;
295
296 needed = sizeof(bsdi_si) + (s - bsdi_strings);
297
298 if ((uap->where == NULL) || (uap->size == NULL)) {
299 /* process is asking how much buffer to supply.. */
300 size = needed;
301 error = 0;
302 break;
303 }
304
305 if ((error = copyin(uap->size, &size, sizeof(size))) != 0)
306 break;
307
308 /* if too much buffer supplied, trim it down */
309 if (size > needed)
310 size = needed;
311
312 /* how much of the buffer is remaining */
313 left = size;
314
315 if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0)
316 break;
317
318 /* is there any point in continuing? */
319 if (left > sizeof(bsdi_si)) {
320 left -= sizeof(bsdi_si);
321 error = copyout(&bsdi_strings,
322 uap->where + sizeof(bsdi_si), left);
323 }
324 break;
325 }
326
327 default:
328 error = EOPNOTSUPP;
329 break;
330 }
331 if (error == 0) {
332 td->td_retval[0] = needed ? needed : size;
333 if (uap->size) {
334 error = copyout(&size, uap->size, sizeof(size));
335 }
336 }
337 return (error);
338 }
339 #endif /* COMPAT_43 */
340
341 #ifdef COMPAT_FREEBSD4
342 /*
343 * This is the FreeBSD-1.1 compatible uname(2) interface. These days it is
344 * done in libc as a wrapper around a bunch of sysctl's. This must maintain
345 * the old 1.1 binary ABI.
346 */
347 #if SYS_NMLN != 32
348 #error "FreeBSD-1.1 uname syscall has been broken"
349 #endif
350 #ifndef _SYS_SYSPROTO_H_
351 struct uname_args {
352 struct utsname *name;
353 };
354 #endif
355 /* ARGSUSED */
356 int
357 freebsd4_uname(struct thread *td, struct freebsd4_uname_args *uap)
358 {
359 int name[2], error;
360 size_t len;
361 char *s, *us;
362
363 name[0] = CTL_KERN;
364 name[1] = KERN_OSTYPE;
365 len = sizeof (uap->name->sysname);
366 error = userland_sysctl(td, name, 2, uap->name->sysname, &len,
367 1, 0, 0, 0, 0);
368 if (error)
369 return (error);
370 subyte( uap->name->sysname + sizeof(uap->name->sysname) - 1, 0);
371
372 name[1] = KERN_HOSTNAME;
373 len = sizeof uap->name->nodename;
374 error = userland_sysctl(td, name, 2, uap->name->nodename, &len,
375 1, 0, 0, 0, 0);
376 if (error)
377 return (error);
378 subyte( uap->name->nodename + sizeof(uap->name->nodename) - 1, 0);
379
380 name[1] = KERN_OSRELEASE;
381 len = sizeof uap->name->release;
382 error = userland_sysctl(td, name, 2, uap->name->release, &len,
383 1, 0, 0, 0, 0);
384 if (error)
385 return (error);
386 subyte( uap->name->release + sizeof(uap->name->release) - 1, 0);
387
388 /*
389 name = KERN_VERSION;
390 len = sizeof uap->name->version;
391 error = userland_sysctl(td, name, 2, uap->name->version, &len,
392 1, 0, 0, 0, 0);
393 if (error)
394 return (error);
395 subyte( uap->name->version + sizeof(uap->name->version) - 1, 0);
396 */
397
398 /*
399 * this stupid hackery to make the version field look like FreeBSD 1.1
400 */
401 for(s = version; *s && *s != '#'; s++);
402
403 for(us = uap->name->version; *s && *s != ':'; s++) {
404 error = subyte( us++, *s);
405 if (error)
406 return (error);
407 }
408 error = subyte( us++, 0);
409 if (error)
410 return (error);
411
412 name[0] = CTL_HW;
413 name[1] = HW_MACHINE;
414 len = sizeof uap->name->machine;
415 error = userland_sysctl(td, name, 2, uap->name->machine, &len,
416 1, 0, 0, 0, 0);
417 if (error)
418 return (error);
419 subyte( uap->name->machine + sizeof(uap->name->machine) - 1, 0);
420 return (0);
421 }
422
423 #ifndef _SYS_SYSPROTO_H_
424 struct getdomainname_args {
425 char *domainname;
426 int len;
427 };
428 #endif
429 /* ARGSUSED */
430 int
431 freebsd4_getdomainname(struct thread *td,
432 struct freebsd4_getdomainname_args *uap)
433 {
434 int name[2];
435 size_t len = uap->len;
436
437 name[0] = CTL_KERN;
438 name[1] = KERN_NISDOMAINNAME;
439 return (userland_sysctl(td, name, 2, uap->domainname, &len,
440 1, 0, 0, 0, 0));
441 }
442
443 #ifndef _SYS_SYSPROTO_H_
444 struct setdomainname_args {
445 char *domainname;
446 int len;
447 };
448 #endif
449 /* ARGSUSED */
450 int
451 freebsd4_setdomainname(struct thread *td,
452 struct freebsd4_setdomainname_args *uap)
453 {
454 int name[2];
455
456 name[0] = CTL_KERN;
457 name[1] = KERN_NISDOMAINNAME;
458 return (userland_sysctl(td, name, 2, 0, 0, 0, uap->domainname,
459 uap->len, 0, 0));
460 }
461 #endif /* COMPAT_FREEBSD4 */
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