source3/lib/util_pw.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Safe versions of getpw* calls
   5
   6    Copyright (C) Andrew Bartlett 2002
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "memcache.h"
  24
  25 struct passwd *tcopy_passwd(TALLOC_CTX *mem_ctx, const struct passwd *from)
  26 {
  27         struct passwd *ret = TALLOC_P(mem_ctx, struct passwd);
  28         if (!ret) {
  29                 return NULL;
  30         }
  31         ret->pw_name = talloc_strdup(ret, from->pw_name);
  32         ret->pw_passwd = talloc_strdup(ret, from->pw_passwd);
  33         ret->pw_uid = from->pw_uid;
  34         ret->pw_gid = from->pw_gid;
  35         ret->pw_gecos = talloc_strdup(ret, from->pw_gecos);
  36         ret->pw_dir = talloc_strdup(ret, from->pw_dir);
  37         ret->pw_shell = talloc_strdup(ret, from->pw_shell);
  38         return ret;
  39 }
  40
  41 void flush_pwnam_cache(void)
  42 {
  43         memcache_flush(NULL, GETPWNAM_CACHE);
  44 }
  45
  46 struct passwd *getpwnam_alloc(TALLOC_CTX *mem_ctx, const char *name)
  47 {
  48         struct passwd *pw, *for_cache;
  49
  50         pw = (struct passwd *)memcache_lookup_talloc(
  51                 NULL, GETPWNAM_CACHE, data_blob_string_const_null(name));
  52         if (pw != NULL) {
  53                 return tcopy_passwd(mem_ctx, pw);
  54         }
  55
  56         pw = sys_getpwnam(name);
  57         if (pw == NULL) {
  58                 return NULL;
  59         }
  60
  61         for_cache = tcopy_passwd(talloc_tos(), pw);
  62         if (for_cache == NULL) {
  63                 return NULL;
  64         }
  65
  66         memcache_add_talloc(NULL, GETPWNAM_CACHE,
  67                             data_blob_string_const_null(name), &for_cache);
  68
  69         return tcopy_passwd(mem_ctx, pw);
  70 }
  71
  72 struct passwd *getpwuid_alloc(TALLOC_CTX *mem_ctx, uid_t uid)
  73 {
  74         struct passwd *temp;
  75
  76         temp = sys_getpwuid(uid);
  77
  78         if (!temp) {
  79 #if 0
  80                 if (errno == ENOMEM) {
  81                         /* what now? */
  82                 }
  83 #endif
  84                 return NULL;
  85         }
  86
  87         return tcopy_passwd(mem_ctx, temp);
  88 }