hesiod/nss_hesiod/hesiod-pwd.c

   1 /* Copyright (C) 1997-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
   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 <hesiod.h>
  21 #include <pwd.h>
  22 #include <nss.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "nss_hesiod.h"
  28
  29 /* Get the declaration of the parser function.  */
  30 #define ENTNAME pwent
  31 #define STRUCTURE passwd
  32 #define EXTERN_PARSER
  33 #include <nss/nss_files/files-parse.c>
  34
  35 enum nss_status
  36 _nss_hesiod_setpwent (int stayopen)
  37 {
  38   return NSS_STATUS_SUCCESS;
  39 }
  40
  41 enum nss_status
  42 _nss_hesiod_endpwent (void)
  43 {
  44   return NSS_STATUS_SUCCESS;
  45 }
  46
  47 static enum nss_status
  48 lookup (const char *name, const char *type, struct passwd *pwd,
  49         char *buffer, size_t buflen, int *errnop)
  50 {
  51   struct parser_data *data = (void *) buffer;
  52   size_t linebuflen;
  53   void *context;
  54   char **list;
  55   int parse_res;
  56   size_t len;
  57   int olderr = errno;
  58
  59   context = _nss_hesiod_init ();
  60   if (context == NULL)
  61     return NSS_STATUS_UNAVAIL;
  62
  63   list = hesiod_resolve (context, name, type);
  64   if (list == NULL)
  65     {
  66       int err = errno;
  67       hesiod_end (context);
  68       __set_errno (olderr);
  69       return err == ENOENT ? NSS_STATUS_NOTFOUND : NSS_STATUS_UNAVAIL;
  70     }
  71
  72   linebuflen = buffer + buflen - data->linebuffer;
  73   len = strlen (*list) + 1;
  74   if (linebuflen < len)
  75     {
  76       hesiod_free_list (context, list);
  77       hesiod_end (context);
  78       *errnop = ERANGE;
  79       return NSS_STATUS_TRYAGAIN;
  80     }
  81
  82   memcpy (data->linebuffer, *list, len);
  83   hesiod_free_list (context, list);
  84   hesiod_end (context);
  85
  86   parse_res = _nss_files_parse_pwent (buffer, pwd, data, buflen, errnop);
  87   if (parse_res < 1)
  88     {
  89       __set_errno (olderr);
  90       return parse_res == -1 ? NSS_STATUS_TRYAGAIN : NSS_STATUS_NOTFOUND;
  91     }
  92
  93   return NSS_STATUS_SUCCESS;
  94 }
  95
  96 enum nss_status
  97 _nss_hesiod_getpwnam_r (const char *name, struct passwd *pwd,
  98                         char *buffer, size_t buflen, int *errnop)
  99 {
 100   return lookup (name, "passwd", pwd, buffer, buflen, errnop);
 101 }
 102
 103 enum nss_status
 104 _nss_hesiod_getpwuid_r (uid_t uid, struct passwd *pwd,
 105                         char *buffer, size_t buflen, int *errnop)
 106 {
 107   char uidstr[21];      /* We will probably never have a gid_t with more
 108                            than 64 bits.  */
 109
 110   snprintf (uidstr, sizeof uidstr, "%d", uid);
 111
 112   return lookup (uidstr, "uid", pwd, buffer, buflen, errnop);
 113 }