nss/nss_test1.c

   1 /* Template generic NSS service provider.  See nss_test.h for usage.
   2    Copyright (C) 2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <nss.h>
  21 #include <pthread.h>
  22 #include <string.h>
  23 #include <stdio.h>
  24 #include <alloc_buffer.h>
  25
  26
  27 /* We need to be able to handle NULLs "properly" within the testsuite,
  28    to test known bad data.  */
  29 #define alloc_buffer_maybe_copy_string(b,s) s ? alloc_buffer_copy_string (b, s) : NULL;
  30
  31 /* This file is the master template.  Other instances of this test
  32    module should define NAME(x) to have their name instead of "test1",
  33    then include this file.
  34 */
  35 #define NAME_(x,n) _nss_##n##_##x
  36 #ifndef NAME
  37 #define NAME(x) NAME_(x,test1)
  38 #endif
  39 #define NAMESTR__(x) #x
  40 #define NAMESTR_(x) NAMESTR__(x)
  41 #define NAMESTR(x) NAMESTR_(NAME(x))
  42
  43 #include "nss_test.h"
  44
  45 /* -------------------------------------------------- */
  46 /* Default Data.  */
  47
  48 static struct passwd default_pwd_data[] =
  49   {
  50 #define PWD(u) \
  51     { .pw_name = (char *) "name" #u, .pw_passwd = (char *) "*", .pw_uid = u,  \
  52       .pw_gid = 100, .pw_gecos = (char *) "*", .pw_dir = (char *) "*",        \
  53       .pw_shell = (char *) "*" }
  54     PWD (30),
  55     PWD (100),
  56     PWD (200),
  57     PWD (60),
  58     PWD (20000)
  59   };
  60 #define default_npwd_data (sizeof (pwd_data) / sizeof (pwd_data[0]))
  61
  62 static struct passwd *pwd_data = default_pwd_data;
  63 static int npwd_data = default_npwd_data;
  64
  65 static struct group *grp_data = NULL;
  66 static int ngrp_data = 0;
  67
  68 /* This function will get called, and once per session, look back into
  69    the test case's executable for an init hook function, and call
  70    it.  */
  71
  72 static int initted = 0;
  73 static void
  74 init(void)
  75 {
  76   test_tables t;
  77   int i;
  78
  79   if (initted)
  80     return;
  81   if (NAME(init_hook))
  82     {
  83       memset (&t, 0, sizeof(t));
  84       NAME(init_hook)(&t);
  85
  86       if (t.pwd_table)
  87         {
  88           pwd_data = t.pwd_table;
  89           for (i=0; ! PWD_ISLAST(& pwd_data[i]); i++)
  90             ;
  91           npwd_data = i;
  92         }
  93
  94       if (t.grp_table)
  95         {
  96           grp_data = t.grp_table;
  97           for (i=0; ! GRP_ISLAST(& grp_data[i]); i++)
  98             ;
  99           ngrp_data = i;
 100         }
 101     }
 102   initted = 1;
 103 }
 104
 105 /* -------------------------------------------------- */
 106 /* Password handling.  */
 107
 108 static size_t pwd_iter;
 109 #define CURPWD pwd_data[pwd_iter]
 110
 111 static pthread_mutex_t pwd_lock = PTHREAD_MUTEX_INITIALIZER;
 112
 113 enum nss_status
 114 NAME(setpwent) (int stayopen)
 115 {
 116   init();
 117   pwd_iter = 0;
 118   return NSS_STATUS_SUCCESS;
 119 }
 120
 121
 122 enum nss_status
 123 NAME(endpwent) (void)
 124 {
 125   init();
 126   return NSS_STATUS_SUCCESS;
 127 }
 128
 129 static enum nss_status
 130 copy_passwd (struct passwd *result, struct passwd *local,
 131             char *buffer, size_t buflen, int *errnop)
 132 {
 133   struct alloc_buffer buf = alloc_buffer_create (buffer, buflen);
 134
 135   result->pw_name = alloc_buffer_maybe_copy_string (&buf, local->pw_name);
 136   result->pw_passwd = alloc_buffer_maybe_copy_string (&buf, local->pw_passwd);
 137   result->pw_uid = local->pw_uid;
 138   result->pw_gid = local->pw_gid;
 139   result->pw_gecos = alloc_buffer_maybe_copy_string (&buf, local->pw_gecos);
 140   result->pw_dir = alloc_buffer_maybe_copy_string (&buf, local->pw_dir);
 141   result->pw_shell = alloc_buffer_maybe_copy_string (&buf, local->pw_shell);
 142
 143   if (alloc_buffer_has_failed (&buf))
 144     {
 145       *errnop = ERANGE;
 146       return NSS_STATUS_TRYAGAIN;
 147     }
 148
 149   return NSS_STATUS_SUCCESS;
 150 }
 151
 152 enum nss_status
 153 NAME(getpwent_r) (struct passwd *result, char *buffer, size_t buflen,
 154                        int *errnop)
 155 {
 156   int res = NSS_STATUS_SUCCESS;
 157
 158   init();
 159   pthread_mutex_lock (&pwd_lock);
 160
 161   if (pwd_iter >= npwd_data)
 162     res = NSS_STATUS_NOTFOUND;
 163   else
 164     {
 165       res = copy_passwd (result, &CURPWD, buffer, buflen, errnop);
 166       ++pwd_iter;
 167     }
 168
 169   pthread_mutex_unlock (&pwd_lock);
 170
 171   return res;
 172 }
 173
 174
 175 enum nss_status
 176 NAME(getpwuid_r) (uid_t uid, struct passwd *result, char *buffer,
 177                        size_t buflen, int *errnop)
 178 {
 179   init();
 180   for (size_t idx = 0; idx < npwd_data; ++idx)
 181     if (pwd_data[idx].pw_uid == uid)
 182       return copy_passwd (result, &pwd_data[idx], buffer, buflen, errnop);
 183
 184   return NSS_STATUS_NOTFOUND;
 185 }
 186
 187
 188 enum nss_status
 189 NAME(getpwnam_r) (const char *name, struct passwd *result, char *buffer,
 190                        size_t buflen, int *errnop)
 191 {
 192   init();
 193   for (size_t idx = 0; idx < npwd_data; ++idx)
 194     if (strcmp (pwd_data[idx].pw_name, name) == 0)
 195       return copy_passwd (result, &pwd_data[idx], buffer, buflen, errnop);
 196
 197   return NSS_STATUS_NOTFOUND;
 198 }
 199
 200 /* -------------------------------------------------- */
 201 /* Group handling.  */
 202
 203 static size_t grp_iter;
 204 #define CURGRP grp_data[grp_iter]
 205
 206 static pthread_mutex_t grp_lock = PTHREAD_MUTEX_INITIALIZER;
 207
 208 enum nss_status
 209 NAME(setgrent) (int stayopen)
 210 {
 211   init();
 212   grp_iter = 0;
 213   return NSS_STATUS_SUCCESS;
 214 }
 215
 216
 217 enum nss_status
 218 NAME(endgrent) (void)
 219 {
 220   init();
 221   return NSS_STATUS_SUCCESS;
 222 }
 223
 224 static enum nss_status
 225 copy_group (struct group *result, struct group *local,
 226             char *buffer, size_t buflen, int *errnop)
 227 {
 228   struct alloc_buffer buf = alloc_buffer_create (buffer, buflen);
 229   char **memlist;
 230   int i;
 231
 232   if (local->gr_mem)
 233     {
 234       i = 0;
 235       while (local->gr_mem[i])
 236         ++i;
 237
 238       memlist = alloc_buffer_alloc_array (&buf, char *, i + 1);
 239
 240       if (memlist) {
 241         for (i = 0; local->gr_mem[i]; ++i)
 242           memlist[i] = alloc_buffer_maybe_copy_string (&buf, local->gr_mem[i]);
 243         memlist[i] = NULL;
 244       }
 245
 246       result->gr_mem = memlist;
 247     }
 248   else
 249     result->gr_mem = NULL;
 250
 251   result->gr_name = alloc_buffer_maybe_copy_string (&buf, local->gr_name);
 252   result->gr_passwd = alloc_buffer_maybe_copy_string (&buf, local->gr_passwd);
 253   result->gr_gid = local->gr_gid;
 254
 255   if (alloc_buffer_has_failed (&buf))
 256     {
 257       *errnop = ERANGE;
 258       return NSS_STATUS_TRYAGAIN;
 259     }
 260
 261   return NSS_STATUS_SUCCESS;
 262 }
 263
 264
 265 enum nss_status
 266 NAME(getgrent_r) (struct group *result, char *buffer, size_t buflen,
 267                        int *errnop)
 268 {
 269   int res = NSS_STATUS_SUCCESS;
 270
 271   init();
 272   pthread_mutex_lock (&grp_lock);
 273
 274   if (grp_iter >= ngrp_data)
 275     res = NSS_STATUS_NOTFOUND;
 276   else
 277     {
 278       res = copy_group (result, &CURGRP, buffer, buflen, errnop);
 279       ++grp_iter;
 280     }
 281
 282   pthread_mutex_unlock (&pwd_lock);
 283
 284   return res;
 285 }
 286
 287
 288 enum nss_status
 289 NAME(getgrgid_r) (gid_t gid, struct group *result, char *buffer,
 290                   size_t buflen, int *errnop)
 291 {
 292   init();
 293   for (size_t idx = 0; idx < ngrp_data; ++idx)
 294     if (grp_data[idx].gr_gid == gid)
 295       return copy_group (result, &grp_data[idx], buffer, buflen, errnop);
 296
 297   return NSS_STATUS_NOTFOUND;
 298 }
 299
 300
 301 enum nss_status
 302 NAME(getgrnam_r) (const char *name, struct group *result, char *buffer,
 303                        size_t buflen, int *errnop)
 304 {
 305   init();
 306   for (size_t idx = 0; idx < ngrp_data; ++idx)
 307     if (strcmp (pwd_data[idx].pw_name, name) == 0)
 308       {
 309         return copy_group (result, &grp_data[idx], buffer, buflen, errnop);
 310       }
 311
 312   return NSS_STATUS_NOTFOUND;
 313 }