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
  83 int
  84 __nss_compat_getgrnam_r(void *retval, void *mdata, va_list ap)
  85 {
  86         int (*fn)(const char *, struct group *, char *, size_t, int *);
  87         const char      *name;
  88         struct group    *grp;
  89         char            *buffer;
  90         int             *errnop;
  91         size_t           bufsize;
  92         enum nss_status  status;
  93
  94         fn = mdata;
  95         name = va_arg(ap, const char *);
  96         grp = va_arg(ap, struct group *);
  97         buffer = va_arg(ap, char *);
  98         bufsize = va_arg(ap, size_t);
  99         errnop = va_arg(ap, int *);
 100         status = fn(name, grp, buffer, bufsize, errnop);
 101         status = __nss_compat_result(status, *errnop);
 102         if (status == NS_SUCCESS)
 103                 *(struct group **)retval = grp;
 104         return (status);
 105 }
 106
 107
 108 int
 109 __nss_compat_getgrgid_r(void *retval, void *mdata, va_list ap)
 110 {
 111         int (*fn)(gid_t, struct group *, char *, size_t, int *);
 112         gid_t            gid;
 113         struct group    *grp;
 114         char            *buffer;
 115         int             *errnop;
 116         size_t           bufsize;
 117         enum nss_status  status;
 118
 119         fn = mdata;
 120         gid = va_arg(ap, gid_t);
 121         grp = va_arg(ap, struct group *);
 122         buffer = va_arg(ap, char *);
 123         bufsize = va_arg(ap, size_t);
 124         errnop = va_arg(ap, int *);
 125         status = fn(gid, grp, buffer, bufsize, errnop);
 126         status = __nss_compat_result(status, *errnop);
 127         if (status == NS_SUCCESS)
 128                 *(struct group **)retval = grp;
 129         return (status);
 130 }
 131
 132
 133 int
 134 __nss_compat_getgrent_r(void *retval, void *mdata, va_list ap)
 135 {
 136         int (*fn)(struct group *, char *, size_t, int *);
 137         struct group    *grp;
 138         char            *buffer;
 139         int             *errnop;
 140         size_t           bufsize;
 141         enum nss_status  status;
 142
 143         if (CHECK_TERMINATOR(group))
 144                 return (NS_NOTFOUND);
 145         fn = mdata;
 146         grp = va_arg(ap, struct group *);
 147         buffer = va_arg(ap, char *);
 148         bufsize = va_arg(ap, size_t);
 149         errnop = va_arg(ap, int *);
 150         status = fn(grp, buffer, bufsize, errnop);
 151         status = __nss_compat_result(status, *errnop);
 152         if (status == NS_SUCCESS)
 153                 *(struct group **)retval = grp;
 154         else if (status != NS_RETURN)
 155                 SET_TERMINATOR(group, &terminator);
 156         return (status);
 157 }
 158
 159
 160 int
 161 __nss_compat_setgrent(void *retval __unused, void *mdata, va_list ap __unused)
 162 {
 163
 164         SET_TERMINATOR(group, NULL);
 165         ((int (*)(void))mdata)();
 166         return (NS_UNAVAIL);
 167 }
 168
 169
 170 int
 171 __nss_compat_endgrent(void *retval __unused, void *mdata, va_list ap __unused)
 172 {
 173
 174         SET_TERMINATOR(group, NULL);
 175         ((int (*)(void))mdata)();
 176         return (NS_UNAVAIL);
 177 }
 178
 179
 180
 181 DECLARE_TERMINATOR(passwd);
 182
 183
 184 int
 185 __nss_compat_getpwnam_r(void *retval, void *mdata, va_list ap)
 186 {
 187         int (*fn)(const char *, struct passwd *, char *, size_t, int *);
 188         const char      *name;
 189         struct passwd   *pwd;
 190         char            *buffer;
 191         int             *errnop;
 192         size_t           bufsize;
 193         enum nss_status  status;
 194
 195         fn = mdata;
 196         name = va_arg(ap, const char *);
 197         pwd = va_arg(ap, struct passwd *);
 198         buffer = va_arg(ap, char *);
 199         bufsize = va_arg(ap, size_t);
 200         errnop = va_arg(ap, int *);
 201         status = fn(name, pwd, buffer, bufsize, errnop);
 202         status = __nss_compat_result(status, *errnop);
 203         if (status == NS_SUCCESS)
 204                 *(struct passwd **)retval = pwd;
 205         return (status);
 206 }
 207
 208
 209 int
 210 __nss_compat_getpwuid_r(void *retval, void *mdata, va_list ap)
 211 {
 212         int (*fn)(uid_t, struct passwd *, char *, size_t, int *);
 213         uid_t            uid;
 214         struct passwd   *pwd;
 215         char            *buffer;
 216         int             *errnop;
 217         size_t           bufsize;
 218         enum nss_status  status;
 219
 220         fn = mdata;
 221         uid = va_arg(ap, uid_t);
 222         pwd = va_arg(ap, struct passwd *);
 223         buffer = va_arg(ap, char *);
 224         bufsize = va_arg(ap, size_t);
 225         errnop = va_arg(ap, int *);
 226         status = fn(uid, pwd, buffer, bufsize, errnop);
 227         status = __nss_compat_result(status, *errnop);
 228         if (status == NS_SUCCESS)
 229                 *(struct passwd **)retval = pwd;
 230         return (status);
 231 }
 232
 233
 234 int
 235 __nss_compat_getpwent_r(void *retval, void *mdata, va_list ap)
 236 {
 237         int (*fn)(struct passwd *, char *, size_t, int *);
 238         struct passwd   *pwd;
 239         char            *buffer;
 240         int             *errnop;
 241         size_t           bufsize;
 242         enum nss_status  status;
 243
 244         if (CHECK_TERMINATOR(passwd))
 245                 return (NS_NOTFOUND);
 246         fn = mdata;
 247         pwd = va_arg(ap, struct passwd *);
 248         buffer = va_arg(ap, char *);
 249         bufsize = va_arg(ap, size_t);
 250         errnop = va_arg(ap, int *);
 251         status = fn(pwd, buffer, bufsize, errnop);
 252         status = __nss_compat_result(status, *errnop);
 253         if (status == NS_SUCCESS)
 254                 *(struct passwd **)retval = pwd;
 255         else if (status != NS_RETURN)
 256                 SET_TERMINATOR(passwd, &terminator);
 257         return (status);
 258 }
 259
 260
 261 int
 262 __nss_compat_setpwent(void *retval __unused, void *mdata, va_list ap __unused)
 263 {
 264
 265         SET_TERMINATOR(passwd, NULL);
 266         ((int (*)(void))mdata)();
 267         return (NS_UNAVAIL);
 268 }
 269
 270
 271 int
 272 __nss_compat_endpwent(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 }