gen/sysctl-fbsd.c

   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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)sysctl.c    8.2 (Berkeley) 1/4/94";
  32 #endif /* LIBC_SCCS and not lint */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD: src/lib/libc/gen/sysctl.c,v 1.6 2007/01/09 00:27:55 imp Exp $");
  35
  36 #include <sys/param.h>
  37 #include <sys/sysctl.h>
  38
  39 #include <errno.h>
  40 #include <limits.h>
  41 #include <paths.h>
  42 #include <stdio.h>
  43 #include <unistd.h>
  44 #include <string.h>
  45
  46 extern int __sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
  47     void *newp, size_t newlen);
  48
  49 int
  50 sysctl(name, namelen, oldp, oldlenp, newp, newlen)
  51         int *name;
  52         u_int namelen;
  53         void *oldp, *newp;
  54         size_t *oldlenp, newlen;
  55 {
  56         if (name[0] != CTL_USER) {
  57                 if (namelen == 2 && name[0] == CTL_KERN && name[1] == KERN_EXEC) {
  58                         /*
  59                          * 7723306: intercept kern.exec and fake a return of
  60                          * a dummy string ("/" in this case)
  61                          */
  62                         if (newp != NULL) {
  63                                 errno = EPERM;
  64                                 return -1;
  65                         }
  66                         if (oldp == NULL) {
  67                                 if (oldlenp != NULL) *oldlenp = 2;
  68                                 return 0;
  69                         }
  70                         if (oldlenp == NULL) {
  71                                 errno = EFAULT;
  72                                 return -1;
  73                         }
  74                         if (*oldlenp < 2) {
  75                                 errno = ENOMEM;
  76                                 return -1;
  77                         }
  78                         memmove(oldp, "/", 2);
  79                         *oldlenp = 2;
  80                         return 0;
  81                 }
  82                 return (__sysctl(name, namelen, oldp, oldlenp, newp, newlen));
  83         }
  84
  85         if (newp != NULL) {
  86                 errno = EPERM;
  87                 return (-1);
  88         }
  89         if (namelen != 2) {
  90                 errno = EINVAL;
  91                 return (-1);
  92         }
  93
  94         switch (name[1]) {
  95         case USER_CS_PATH:
  96                 if (oldp && *oldlenp < sizeof(_PATH_STDPATH)) {
  97                         errno = ENOMEM;
  98                         return -1;
  99                 }
 100                 *oldlenp = sizeof(_PATH_STDPATH);
 101                 if (oldp != NULL)
 102                         memmove(oldp, _PATH_STDPATH, sizeof(_PATH_STDPATH));
 103                 return (0);
 104         }
 105
 106         if (oldp && *oldlenp < sizeof(int)) {
 107                 errno = ENOMEM;
 108                 return (-1);
 109         }
 110         *oldlenp = sizeof(int);
 111         if (oldp == NULL)
 112                 return (0);
 113
 114         switch (name[1]) {
 115         case USER_BC_BASE_MAX:
 116                 *(int *)oldp = BC_BASE_MAX;
 117                 return (0);
 118         case USER_BC_DIM_MAX:
 119                 *(int *)oldp = BC_DIM_MAX;
 120                 return (0);
 121         case USER_BC_SCALE_MAX:
 122                 *(int *)oldp = BC_SCALE_MAX;
 123                 return (0);
 124         case USER_BC_STRING_MAX:
 125                 *(int *)oldp = BC_STRING_MAX;
 126                 return (0);
 127         case USER_COLL_WEIGHTS_MAX:
 128                 *(int *)oldp = COLL_WEIGHTS_MAX;
 129                 return (0);
 130         case USER_EXPR_NEST_MAX:
 131                 *(int *)oldp = EXPR_NEST_MAX;
 132                 return (0);
 133         case USER_LINE_MAX:
 134                 *(int *)oldp = LINE_MAX;
 135                 return (0);
 136         case USER_RE_DUP_MAX:
 137                 *(int *)oldp = RE_DUP_MAX;
 138                 return (0);
 139         case USER_POSIX2_VERSION:
 140                 *(int *)oldp = _POSIX2_VERSION;
 141                 return (0);
 142         case USER_POSIX2_C_BIND:
 143 #ifdef POSIX2_C_BIND
 144                 *(int *)oldp = 1;
 145 #else
 146                 *(int *)oldp = 0;
 147 #endif
 148                 return (0);
 149         case USER_POSIX2_C_DEV:
 150 #ifdef  POSIX2_C_DEV
 151                 *(int *)oldp = 1;
 152 #else
 153                 *(int *)oldp = 0;
 154 #endif
 155                 return (0);
 156         case USER_POSIX2_CHAR_TERM:
 157 #ifdef  POSIX2_CHAR_TERM
 158                 *(int *)oldp = 1;
 159 #else
 160                 *(int *)oldp = 0;
 161 #endif
 162                 return (0);
 163         case USER_POSIX2_FORT_DEV:
 164 #ifdef  POSIX2_FORT_DEV
 165                 *(int *)oldp = 1;
 166 #else
 167                 *(int *)oldp = 0;
 168 #endif
 169                 return (0);
 170         case USER_POSIX2_FORT_RUN:
 171 #ifdef  POSIX2_FORT_RUN
 172                 *(int *)oldp = 1;
 173 #else
 174                 *(int *)oldp = 0;
 175 #endif
 176                 return (0);
 177         case USER_POSIX2_LOCALEDEF:
 178 #ifdef  POSIX2_LOCALEDEF
 179                 *(int *)oldp = 1;
 180 #else
 181                 *(int *)oldp = 0;
 182 #endif
 183                 return (0);
 184         case USER_POSIX2_SW_DEV:
 185 #ifdef  POSIX2_SW_DEV
 186                 *(int *)oldp = 1;
 187 #else
 188                 *(int *)oldp = 0;
 189 #endif
 190                 return (0);
 191         case USER_POSIX2_UPE:
 192 #ifdef  POSIX2_UPE
 193                 *(int *)oldp = 1;
 194 #else
 195                 *(int *)oldp = 0;
 196 #endif
 197                 return (0);
 198         case USER_STREAM_MAX:
 199                 *(int *)oldp = FOPEN_MAX;
 200                 return (0);
 201         case USER_TZNAME_MAX:
 202                 *(int *)oldp = NAME_MAX;
 203                 return (0);
 204         default:
 205                 errno = EINVAL;
 206                 return (-1);
 207         }
 208         /* NOTREACHED */
 209 }