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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24
  25 static struct passwd *alloc_copy_passwd(const struct passwd *from)
  26 {
  27         struct passwd *ret = smb_xmalloc(sizeof(struct passwd));
  28         ZERO_STRUCTP(ret);
  29         ret->pw_name = smb_xstrdup(from->pw_name);
  30         ret->pw_passwd = smb_xstrdup(from->pw_passwd);
  31         ret->pw_uid = from->pw_uid;
  32         ret->pw_gid = from->pw_gid;
  33         ret->pw_gecos = smb_xstrdup(from->pw_gecos);
  34         ret->pw_dir = smb_xstrdup(from->pw_dir);
  35         ret->pw_shell = smb_xstrdup(from->pw_shell);
  36         return ret;
  37 }
  38
  39 void passwd_free (struct passwd **buf)
  40 {
  41         if (!*buf) {
  42                 DEBUG(0, ("attempted double-free of allocated passwd\n"));
  43                 return;
  44         }
  45
  46         SAFE_FREE((*buf)->pw_name);
  47         SAFE_FREE((*buf)->pw_passwd);
  48         SAFE_FREE((*buf)->pw_gecos);
  49         SAFE_FREE((*buf)->pw_dir);
  50         SAFE_FREE((*buf)->pw_shell);
  51
  52         SAFE_FREE(*buf);
  53 }
  54
  55 struct passwd *getpwnam_alloc(const char *name)
  56 {
  57         struct passwd *temp;
  58
  59         temp = sys_getpwnam(name);
  60
  61         if (!temp) {
  62 #if 0
  63                 if (errno == ENOMEM) {
  64                         /* what now? */
  65                 }
  66 #endif
  67                 return NULL;
  68         }
  69
  70         return alloc_copy_passwd(temp);
  71 }
  72
  73 struct passwd *getpwuid_alloc(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 alloc_copy_passwd(temp);
  89 }