hesiod/nss_hesiod/hesiod-pwd.c

   1 /* Copyright (C) 1997-2019 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    <https://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 /* Get the declaration of the parser function.  */
  28 #define ENTNAME pwent
  29 #define STRUCTURE passwd
  30 #define EXTERN_PARSER
  31 #include <nss/nss_files/files-parse.c>
  32
  33 enum nss_status
  34 _nss_hesiod_setpwent (int stayopen)
  35 {
  36   return NSS_STATUS_SUCCESS;
  37 }
  38
  39 enum nss_status
  40 _nss_hesiod_endpwent (void)
  41 {
  42   return NSS_STATUS_SUCCESS;
  43 }
  44
  45 static enum nss_status
  46 lookup (const char *name, const char *type, struct passwd *pwd,
  47         char *buffer, size_t buflen, int *errnop)
  48 {
  49   struct parser_data *data = (void *) buffer;
  50   size_t linebuflen;
  51   void *context;
  52   char **list;
  53   int parse_res;
  54   size_t len;
  55   int olderr = errno;
  56
  57   if (hesiod_init (&context) < 0)
  58     return NSS_STATUS_UNAVAIL;
  59
  60   list = hesiod_resolve (context, name, type);
  61   if (list == NULL)
  62     {
  63       int err = errno;
  64       hesiod_end (context);
  65       __set_errno (olderr);
  66       return err == ENOENT ? NSS_STATUS_NOTFOUND : NSS_STATUS_UNAVAIL;
  67     }
  68
  69   linebuflen = buffer + buflen - data->linebuffer;
  70   len = strlen (*list) + 1;
  71   if (linebuflen < len)
  72     {
  73       hesiod_free_list (context, list);
  74       hesiod_end (context);
  75       *errnop = ERANGE;
  76       return NSS_STATUS_TRYAGAIN;
  77     }
  78
  79   memcpy (data->linebuffer, *list, len);
  80   hesiod_free_list (context, list);
  81   hesiod_end (context);
  82
  83   parse_res = _nss_files_parse_pwent (buffer, pwd, data, buflen, errnop);
  84   if (parse_res < 1)
  85     {
  86       __set_errno (olderr);
  87       return parse_res == -1 ? NSS_STATUS_TRYAGAIN : NSS_STATUS_NOTFOUND;
  88     }
  89
  90   return NSS_STATUS_SUCCESS;
  91 }
  92
  93 enum nss_status
  94 _nss_hesiod_getpwnam_r (const char *name, struct passwd *pwd,
  95                         char *buffer, size_t buflen, int *errnop)
  96 {
  97   return lookup (name, "passwd", pwd, buffer, buflen, errnop);
  98 }
  99
 100 enum nss_status
 101 _nss_hesiod_getpwuid_r (uid_t uid, struct passwd *pwd,
 102                         char *buffer, size_t buflen, int *errnop)
 103 {
 104   char uidstr[21];      /* We will probably never have a gid_t with more
 105                            than 64 bits.  */
 106
 107   snprintf (uidstr, sizeof uidstr, "%d", uid);
 108
 109   return lookup (uidstr, "uid", pwd, buffer, buflen, errnop);
 110 }