lib/libc/net/nss_compat.c

   1 /*-
   2  * Copyright (c) 2003 Networks Associates Technology, Inc.
   3  * All rights reserved.
   4  *
   5  * This software was developed for the FreeBSD Project by
   6  * Jacques A. Vidrine, Safeport Network Services, and Network
   7  * Associates Laboratories, the Security Research Division of Network
   8  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
   9  * ("CBOSS"), as part of the DARPA CHATS research program.
  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  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * Compatibility shims for the GNU C Library-style nsswitch interface.
  33  */
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include "namespace.h"
  38 #include <sys/param.h>
  39 #include <errno.h>
  40 #include <nss.h>
  41 #include <pthread.h>
  42 #include <pthread_np.h>
  43 #include "un-namespace.h"
  44 #include "libc_private.h"
  45
  46
  47 struct group;
  48 struct passwd;
  49
  50 static int      terminator;
  51
  52 #define DECLARE_TERMINATOR(x)                                   \
  53 static pthread_key_t     _term_key_##x;                         \
  54 static void                                                     \
  55 _term_create_##x(void)                                          \
  56 {                                                               \
  57         (void)_pthread_key_create(&_term_key_##x, NULL);        \
  58 }                                                               \
  59 static void             *_term_main_##x;                        \
  60 static pthread_once_t    _term_once_##x = PTHREAD_ONCE_INIT
  61
  62 #define SET_TERMINATOR(x, y)                                            \
  63 do {                                                                    \
  64         if (!__isthreaded || _pthread_main_np())                        \
  65                 _term_main_##x = (y);                                   \
  66         else {                                                          \
  67                 (void)_pthread_once(&_term_once_##x, _term_create_##x); \
  68                 (void)_pthread_setspecific(_term_key_##x, y);           \
  69         }                                                               \
  70 } while (0)
  71
  72 #define CHECK_TERMINATOR(x)                                     \
  73 (!__isthreaded || _pthread_main_np() ?                          \
  74     (_term_main_##x) :                                          \
  75     ((void)_pthread_once(&_term_once_##x, _term_create_##x),    \
  76     _pthread_getspecific(_term_key_##x)))
  77
  78
  79
  80 DECLARE_TERMINATOR(group);
  81
  82 int __nss_compat_getgrnam_r(void *retval, void *mdata, va_list ap);
  83 int __nss_compat_getgrgid_r(void *retval, void *mdata, va_list ap);
  84 int __nss_compat_getgrent_r(void *retval, void *mdata, va_list ap);
  85 int __nss_compat_setgrent(void *retval, void *mdata, va_list ap);
  86 int __nss_compat_endgrent(void *retval, void *mdata, va_list ap);
  87 int __nss_compat_getpwnam_r(void *retval, void *mdata, va_list ap);
  88 int __nss_compat_getpwuid_r(void *retval, void *mdata, va_list ap);
  89 int __nss_compat_getpwent_r(void *retval, void *mdata, va_list ap);
  90 int __nss_compat_setpwent(void *retval, void *mdata, va_list ap);
  91 int __nss_compat_endpwent(void *retval, void *mdata, va_list ap);
  92
  93 int
  94 __nss_compat_getgrnam_r(void *retval, void *mdata, va_list ap)
  95 {
  96         int (*fn)(const char *, struct group *, char *, size_t, int *);
  97         const char      *name;
  98         struct group    *grp;
  99         char            *buffer;
 100         int             *errnop;
 101         size_t           bufsize;
 102         enum nss_status  status;
 103
 104         fn = mdata;
 105         name = va_arg(ap, const char *);
 106         grp = va_arg(ap, struct group *);
 107         buffer = va_arg(ap, char *);
 108         bufsize = va_arg(ap, size_t);
 109         errnop = va_arg(ap, int *);
 110         status = fn(name, grp, buffer, bufsize, errnop);
 111         status = __nss_compat_result(status, *errnop);
 112         if (status == NS_SUCCESS)
 113                 *(struct group **)retval = grp;
 114         return (status);
 115 }
 116
 117
 118 int
 119 __nss_compat_getgrgid_r(void *retval, void *mdata, va_list ap)
 120 {
 121         int (*fn)(gid_t, struct group *, char *, size_t, int *);
 122         gid_t            gid;
 123         struct group    *grp;
 124         char            *buffer;
 125         int             *errnop;
 126         size_t           bufsize;
 127         enum nss_status  status;
 128
 129         fn = mdata;
 130         gid = va_arg(ap, gid_t);
 131         grp = va_arg(ap, struct group *);
 132         buffer = va_arg(ap, char *);
 133         bufsize = va_arg(ap, size_t);
 134         errnop = va_arg(ap, int *);
 135         status = fn(gid, grp, buffer, bufsize, errnop);
 136         status = __nss_compat_result(status, *errnop);
 137         if (status == NS_SUCCESS)
 138                 *(struct group **)retval = grp;
 139         return (status);
 140 }
 141
 142
 143 int
 144 __nss_compat_getgrent_r(void *retval, void *mdata, va_list ap)
 145 {
 146         int (*fn)(struct group *, char *, size_t, int *);
 147         struct group    *grp;
 148         char            *buffer;
 149         int             *errnop;
 150         size_t           bufsize;
 151         enum nss_status  status;
 152
 153         if (CHECK_TERMINATOR(group))
 154                 return (NS_NOTFOUND);
 155         fn = mdata;
 156         grp = va_arg(ap, struct group *);
 157         buffer = va_arg(ap, char *);
 158         bufsize = va_arg(ap, size_t);
 159         errnop = va_arg(ap, int *);
 160         status = fn(grp, buffer, bufsize, errnop);
 161         status = __nss_compat_result(status, *errnop);
 162         if (status == NS_SUCCESS)
 163                 *(struct group **)retval = grp;
 164         else if (status != NS_RETURN)
 165                 SET_TERMINATOR(group, &terminator);
 166         return (status);
 167 }
 168
 169
 170 int
 171 __nss_compat_setgrent(void *retval, void *mdata, va_list ap)
 172 {
 173
 174         SET_TERMINATOR(group, NULL);
 175         ((int (*)(void))mdata)();
 176         return (NS_UNAVAIL);
 177 }
 178
 179
 180 int
 181 __nss_compat_endgrent(void *retval, void *mdata, va_list ap)
 182 {
 183
 184         SET_TERMINATOR(group, NULL);
 185         ((int (*)(void))mdata)();
 186         return (NS_UNAVAIL);
 187 }
 188
 189
 190
 191 DECLARE_TERMINATOR(passwd);
 192
 193
 194 int
 195 __nss_compat_getpwnam_r(void *retval, void *mdata, va_list ap)
 196 {
 197         int (*fn)(const char *, struct passwd *, char *, size_t, int *);
 198         const char      *name;
 199         struct passwd   *pwd;
 200         char            *buffer;
 201         int             *errnop;
 202         size_t           bufsize;
 203         enum nss_status  status;
 204
 205         fn = mdata;
 206         name = va_arg(ap, const char *);
 207         pwd = va_arg(ap, struct passwd *);
 208         buffer = va_arg(ap, char *);
 209         bufsize = va_arg(ap, size_t);
 210         errnop = va_arg(ap, int *);
 211         status = fn(name, pwd, buffer, bufsize, errnop);
 212         status = __nss_compat_result(status, *errnop);
 213         if (status == NS_SUCCESS)
 214                 *(struct passwd **)retval = pwd;
 215         return (status);
 216 }
 217
 218
 219 int
 220 __nss_compat_getpwuid_r(void *retval, void *mdata, va_list ap)
 221 {
 222         int (*fn)(uid_t, struct passwd *, char *, size_t, int *);
 223         uid_t            uid;
 224         struct passwd   *pwd;
 225         char            *buffer;
 226         int             *errnop;
 227         size_t           bufsize;
 228         enum nss_status  status;
 229
 230         fn = mdata;
 231         uid = va_arg(ap, uid_t);
 232         pwd = va_arg(ap, struct passwd *);
 233         buffer = va_arg(ap, char *);
 234         bufsize = va_arg(ap, size_t);
 235         errnop = va_arg(ap, int *);
 236         status = fn(uid, pwd, buffer, bufsize, errnop);
 237         status = __nss_compat_result(status, *errnop);
 238         if (status == NS_SUCCESS)
 239                 *(struct passwd **)retval = pwd;
 240         return (status);
 241 }
 242
 243
 244 int
 245 __nss_compat_getpwent_r(void *retval, void *mdata, va_list ap)
 246 {
 247         int (*fn)(struct passwd *, char *, size_t, int *);
 248         struct passwd   *pwd;
 249         char            *buffer;
 250         int             *errnop;
 251         size_t           bufsize;
 252         enum nss_status  status;
 253
 254         if (CHECK_TERMINATOR(passwd))
 255                 return (NS_NOTFOUND);
 256         fn = mdata;
 257         pwd = va_arg(ap, struct passwd *);
 258         buffer = va_arg(ap, char *);
 259         bufsize = va_arg(ap, size_t);
 260         errnop = va_arg(ap, int *);
 261         status = fn(pwd, buffer, bufsize, errnop);
 262         status = __nss_compat_result(status, *errnop);
 263         if (status == NS_SUCCESS)
 264                 *(struct passwd **)retval = pwd;
 265         else if (status != NS_RETURN)
 266                 SET_TERMINATOR(passwd, &terminator);
 267         return (status);
 268 }
 269
 270
 271 int
 272 __nss_compat_setpwent(void *retval, void *mdata, va_list ap)
 273 {
 274
 275         SET_TERMINATOR(passwd, NULL);
 276         ((int (*)(void))mdata)();
 277         return (NS_UNAVAIL);
 278 }
 279
 280
 281 int
 282 __nss_compat_endpwent(void *retval, void *mdata, va_list ap)
 283 {
 284
 285         SET_TERMINATOR(passwd, NULL);
 286         ((int (*)(void))mdata)();
 287         return (NS_UNAVAIL);
 288 }