gen/confstr.c

   1 /*
   2  * Copyright (c) 1999, 2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  */
  55
  56
  57 #include <sys/param.h>
  58 #include <sys/sysctl.h>
  59
  60 #include <errno.h>
  61 #include <paths.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65 #include <stdio.h>      /* for P_tmpdir */
  66
  67 #ifndef __has_include
  68 #include <dirhelper_priv.h>
  69 #else
  70 #if __has_include(<dirhelper_priv.h>)
  71 #include <dirhelper_priv.h>
  72 #else
  73 typedef enum {
  74     DIRHELPER_USER_LOCAL = 0,
  75     DIRHELPER_USER_LOCAL_TEMP,
  76     DIRHELPER_USER_LOCAL_CACHE,
  77     DIRHELPER_USER_LOCAL_LAST = DIRHELPER_USER_LOCAL_CACHE
  78 } dirhelper_which_t;
  79 #endif
  80 #endif
  81
  82 #include "libc_private.h"
  83
  84 #if __DARWIN_UNIX03
  85 static char *(*__dirhelper_func)(int, char *, size_t);
  86
  87 __attribute__((__visibility__("hidden")))
  88 void
  89 __confstr_init(const struct _libc_functions *funcs)
  90 {
  91         __dirhelper_func = funcs->dirhelper;
  92 }
  93
  94 __attribute__((__visibility__("hidden")))
  95 char *
  96 __dirhelper(dirhelper_which_t which, char *path, size_t pathlen)
  97 {
  98         if (__dirhelper_func) {
  99                 return __dirhelper_func(which, path, pathlen);
 100         } else {
 101                 return NULL;
 102         }
 103 }
 104 #else // !__DARWIN_UNIX03
 105 __attribute__((__visibility__("hidden")))
 106 char *__dirhelper(dirhelper_which_t which, char *path, size_t pathlen);
 107 #endif // !__DARWIN_UNIX03
 108
 109 #if __DARWIN_UNIX03
 110 #define CONFSTR_ERR_RET 0
 111 #else /* !__DARWIN_UNIX03 */
 112 #define CONFSTR_ERR_RET -1
 113 #endif /* __DARWIN_UNIX03 */
 114
 115 size_t
 116 confstr(name, buf, len)
 117         int name;
 118         char *buf;
 119         size_t len;
 120 {
 121         size_t tlen;
 122         int mib[2], sverrno;
 123         char *p;
 124
 125         switch (name) {
 126         case _CS_PATH:
 127                 mib[0] = CTL_USER;
 128                 mib[1] = USER_CS_PATH;
 129                 if (sysctl(mib, 2, NULL, &tlen, NULL, 0) == -1)
 130                         return (CONFSTR_ERR_RET);
 131                 if (len != 0 && buf != NULL) {
 132                         if ((p = malloc(tlen)) == NULL)
 133                                 return (CONFSTR_ERR_RET);
 134                         if (sysctl(mib, 2, p, &tlen, NULL, 0) == -1) {
 135                                 sverrno = errno;
 136                                 free(p);
 137                                 errno = sverrno;
 138                                 return (CONFSTR_ERR_RET);
 139                         }
 140                         /*
 141                          * POSIX 1003.2 requires partial return of
 142                          * the string -- that should be *real* useful.
 143                          */
 144                         (void)strncpy(buf, p, len - 1);
 145                         buf[len - 1] = '\0';
 146                         free(p);
 147                 }
 148                 return (tlen);
 149
 150         case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
 151         case _CS_XBS5_ILP32_OFF32_CFLAGS:               /* legacy */
 152
 153         case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
 154         case _CS_XBS5_ILP32_OFF32_LDFLAGS:              /* legacy */
 155
 156         case _CS_POSIX_V6_ILP32_OFF32_LIBS:
 157         case _CS_XBS5_ILP32_OFF32_LIBS:                 /* legacy */
 158
 159         case _CS_XBS5_ILP32_OFF32_LINTFLAGS:            /* legacy */
 160
 161         case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
 162         case _CS_XBS5_ILP32_OFFBIG_LIBS:                /* legacy */
 163
 164         case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:           /* legacy */
 165
 166         case _CS_POSIX_V6_LP64_OFF64_LIBS:
 167         case _CS_XBS5_LP64_OFF64_LIBS:                  /* legacy */
 168
 169         case _CS_XBS5_LP64_OFF64_LINTFLAGS:             /* legacy */
 170
 171         case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
 172         case _CS_XBS5_LPBIG_OFFBIG_LIBS:                /* legacy */
 173
 174         case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS:           /* legacy */
 175                 /* No special flags... yet */
 176                 p = "";
 177                 goto docopy;
 178
 179         case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
 180         case _CS_XBS5_ILP32_OFFBIG_CFLAGS:              /* legacy */
 181
 182         case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
 183         case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:             /* legacy */
 184                 p = "-W 32";
 185                 goto docopy;
 186
 187         case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
 188         case _CS_XBS5_LP64_OFF64_CFLAGS:                /* legacy */
 189
 190         case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
 191         case _CS_XBS5_LP64_OFF64_LDFLAGS:               /* legacy */
 192
 193         case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
 194         case _CS_XBS5_LPBIG_OFFBIG_CFLAGS:              /* legacy */
 195
 196         case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
 197         case _CS_XBS5_LPBIG_OFFBIG_LDFLAGS:             /* legacy */
 198                 p = "-W 64";
 199                 goto docopy;
 200
 201         case _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS:
 202                 if (sizeof(long) >= 8)
 203                         p = "_POSIX_V6_LP64_OFF64";
 204                 else
 205                         p = "_POSIX_V6_ILP32_OFFBIG";
 206
 207 docopy:
 208                 if (len != 0 && buf != NULL)
 209                         strlcpy(buf, p, len);
 210                 return (strlen(p) + 1);
 211
 212         case _CS_DARWIN_USER_DIR:
 213                 if ((p = alloca(PATH_MAX)) == NULL) {
 214                         errno = ENOMEM;
 215                         return (CONFSTR_ERR_RET);
 216                 }
 217                 if (__dirhelper(DIRHELPER_USER_LOCAL, p, PATH_MAX) == NULL) {
 218                         if (errno != ENOMEM)
 219                                 errno = EIO;
 220                         return (CONFSTR_ERR_RET);
 221                 }
 222                 goto docopy;
 223
 224         case _CS_DARWIN_USER_TEMP_DIR:
 225                 if ((p = alloca(PATH_MAX)) == NULL) {
 226                         errno = ENOMEM;
 227                         return (CONFSTR_ERR_RET);
 228                 }
 229                 if (__dirhelper(DIRHELPER_USER_LOCAL_TEMP, p, PATH_MAX) == NULL) {
 230                         int dh_errno = errno;
 231                         /*
 232                          * If __dirhelper() fails, try TMPDIR and P_tmpdir,
 233                          * finally failing otherwise.
 234                          */
 235                         if ((p = getenv("TMPDIR")) && access(p, W_OK) == 0)
 236                                 goto docopy;
 237                         if (access(p = P_tmpdir, W_OK) == 0)
 238                                 goto docopy;
 239                         if (dh_errno == ENOMEM)
 240                                 errno = ENOMEM;
 241                         else
 242                                 errno = EIO;
 243                         return (CONFSTR_ERR_RET);
 244                 }
 245                 goto docopy;
 246
 247         case _CS_DARWIN_USER_CACHE_DIR:
 248                 if ((p = alloca(PATH_MAX)) == NULL) {
 249                         errno = ENOMEM;
 250                         return (CONFSTR_ERR_RET);
 251                 }
 252                 if (__dirhelper(DIRHELPER_USER_LOCAL_CACHE, p, PATH_MAX) == NULL) {
 253                         if (errno != ENOMEM)
 254                                 errno = EIO;
 255                         return (CONFSTR_ERR_RET);
 256                 }
 257                 goto docopy;
 258
 259         default:
 260                 errno = EINVAL;
 261                 return (0);
 262         }
 263         /* NOTREACHED */
 264 }