source/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
  24 struct passwd *tcopy_passwd(TALLOC_CTX *mem_ctx, const struct passwd *from)
  25 {
  26         struct passwd *ret = TALLOC_P(mem_ctx, struct passwd);
  27         if (!ret) {
  28                 return NULL;
  29         }
  30         ret->pw_name = talloc_strdup(ret, from->pw_name);
  31         ret->pw_passwd = talloc_strdup(ret, from->pw_passwd);
  32         ret->pw_uid = from->pw_uid;
  33         ret->pw_gid = from->pw_gid;
  34         ret->pw_gecos = talloc_strdup(ret, from->pw_gecos);
  35         ret->pw_dir = talloc_strdup(ret, from->pw_dir);
  36         ret->pw_shell = talloc_strdup(ret, from->pw_shell);
  37         return ret;
  38 }
  39
  40 void flush_pwnam_cache(void)
  41 {
  42         memcache_flush(NULL, GETPWNAM_CACHE);
  43 }
  44
  45 struct passwd *getpwnam_alloc(TALLOC_CTX *mem_ctx, const char *name)
  46 {
  47         struct passwd *temp, *cached;
  48
  49         temp = (struct passwd *)memcache_lookup_talloc(
  50                 NULL, GETPWNAM_CACHE, data_blob_string_const(name));
  51         if (temp != NULL) {
  52                 return tcopy_passwd(mem_ctx, temp);
  53         }
  54
  55         temp = sys_getpwnam(name);
  56         if (temp == NULL) {
  57                 return NULL;
  58         }
  59
  60         cached = tcopy_passwd(NULL, temp);
  61         if (cached == NULL) {
  62                 /*
  63                  * Just don't add this into the cache, ignore the failure
  64                  */
  65                 return temp;
  66         }
  67
  68         memcache_add_talloc(NULL, GETPWNAM_CACHE, data_blob_string_const(name),
  69                             cached);
  70         return tcopy_passwd(mem_ctx, temp);
  71 }
  72
  73 struct passwd *getpwuid_alloc(TALLOC_CTX *mem_ctx, uid_t uid)
  74 {
  75         struct passwd *temp;
  76
  77         temp = sys_getpwuid(uid);
  78
  79         if (!temp) {
  80 #if 0
  81                 if (errno == ENOMEM) {
  82                         /* what now? */
  83                 }
  84 #endif
  85                 return NULL;
  86         }
  87
  88         return tcopy_passwd(mem_ctx, temp);
  89 }