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  * $FreeBSD: src/lib/libc/net/nss_compat.c,v 1.3 2004/03/30 15:56:15 nectar Exp $
  35  */
  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         _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                 _pthread_once(&_term_once_##x, _term_create_##x);       \
  68                 _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     (_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 *, void *, va_list);
  83 int __nss_compat_getgrgid_r(void *, void *, va_list);
  84 int __nss_compat_getgrent_r(void *, void *, va_list);
  85 int __nss_compat_setgrent(void *, void *, va_list);
  86 int __nss_compat_endgrent(void *, void *, va_list);
  87
  88 int
  89 __nss_compat_getgrnam_r(void *retval, void *mdata, va_list ap)
  90 {
  91         int (*fn)(const char *, struct group *, char *, size_t, int *);
  92         const char      *name;
  93         struct group    *grp;
  94         char            *buffer;
  95         int             *errnop;
  96         size_t           bufsize;
  97         enum nss_status  status;
  98
  99         fn = mdata;
 100         name = va_arg(ap, const char *);
 101         grp = va_arg(ap, struct group *);
 102         buffer = va_arg(ap, char *);
 103         bufsize = va_arg(ap, size_t);
 104         errnop = va_arg(ap, int *);
 105         status = fn(name, grp, buffer, bufsize, errnop);
 106         status = __nss_compat_result(status, *errnop);
 107         if (status == NS_SUCCESS)
 108                 *(struct group **)retval = grp;
 109         return (status);
 110 }
 111
 112
 113 int
 114 __nss_compat_getgrgid_r(void *retval, void *mdata, va_list ap)
 115 {
 116         int (*fn)(gid_t, struct group *, char *, size_t, int *);
 117         gid_t            gid;
 118         struct group    *grp;
 119         char            *buffer;
 120         int             *errnop;
 121         size_t           bufsize;
 122         enum nss_status  status;
 123
 124         fn = mdata;
 125         gid = va_arg(ap, gid_t);
 126         grp = va_arg(ap, struct group *);
 127         buffer = va_arg(ap, char *);
 128         bufsize = va_arg(ap, size_t);
 129         errnop = va_arg(ap, int *);
 130         status = fn(gid, grp, buffer, bufsize, errnop);
 131         status = __nss_compat_result(status, *errnop);
 132         if (status == NS_SUCCESS)
 133                 *(struct group **)retval = grp;
 134         return (status);
 135 }
 136
 137
 138 int
 139 __nss_compat_getgrent_r(void *retval, void *mdata, va_list ap)
 140 {
 141         int (*fn)(struct group *, char *, size_t, int *);
 142         struct group    *grp;
 143         char            *buffer;
 144         int             *errnop;
 145         size_t           bufsize;
 146         enum nss_status  status;
 147
 148         if (CHECK_TERMINATOR(group))
 149                 return (NS_NOTFOUND);
 150         fn = mdata;
 151         grp = va_arg(ap, struct group *);
 152         buffer = va_arg(ap, char *);
 153         bufsize = va_arg(ap, size_t);
 154         errnop = va_arg(ap, int *);
 155         status = fn(grp, buffer, bufsize, errnop);
 156         status = __nss_compat_result(status, *errnop);
 157         if (status == NS_SUCCESS)
 158                 *(struct group **)retval = grp;
 159         else if (status != NS_RETURN)
 160                 SET_TERMINATOR(group, &terminator);
 161         return (status);
 162 }
 163
 164
 165 int
 166 __nss_compat_setgrent(void *retval __unused, void *mdata, va_list ap __unused)
 167 {
 168
 169         SET_TERMINATOR(group, NULL);
 170         ((int (*)(void))mdata)();
 171         return (NS_UNAVAIL);
 172 }
 173
 174
 175 int
 176 __nss_compat_endgrent(void *retval __unused, void *mdata, va_list ap __unused)
 177 {
 178
 179         SET_TERMINATOR(group, NULL);
 180         ((int (*)(void))mdata)();
 181         return (NS_UNAVAIL);
 182 }
 183
 184
 185
 186 DECLARE_TERMINATOR(passwd);
 187
 188 int __nss_compat_getpwnam_r(void *, void *, va_list);
 189 int __nss_compat_getpwuid_r(void *, void *, va_list);
 190 int __nss_compat_getpwent_r(void *, void *, va_list);
 191 int __nss_compat_setpwent(void *, void *, va_list);
 192 int __nss_compat_endpwent(void *, void *, va_list);
 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 __unused, void *mdata, va_list ap __unused)
 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 __unused, void *mdata, va_list ap __unused)
 283 {
 284
 285         SET_TERMINATOR(passwd, NULL);
 286         ((int (*)(void))mdata)();
 287         return (NS_UNAVAIL);
 288 }