nscd/nscd_getpw_r.c

   1 /* Copyright (C) 1998, 1999, 2003, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1998.
   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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <pwd.h>
  22 #include <stdint.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <sys/socket.h>
  28 #include <sys/uio.h>
  29 #include <sys/un.h>
  30 #include <not-cancel.h>
  31 #include <stdio-common/_itoa.h>
  32
  33 #include "nscd-client.h"
  34 #include "nscd_proto.h"
  35
  36 int __nss_not_use_nscd_passwd;
  37
  38 static int nscd_getpw_r (const char *key, size_t keylen, request_type type,
  39                          struct passwd *resultbuf, char *buffer,
  40                          size_t buflen, struct passwd **result)
  41      internal_function;
  42
  43 int
  44 __nscd_getpwnam_r (const char *name, struct passwd *resultbuf, char *buffer,
  45                    size_t buflen, struct passwd **result)
  46 {
  47   if (name == NULL)
  48     return -1;
  49
  50   return nscd_getpw_r (name, strlen (name) + 1, GETPWBYNAME, resultbuf,
  51                        buffer, buflen, result);
  52 }
  53
  54 int
  55 __nscd_getpwuid_r (uid_t uid, struct passwd *resultbuf, char *buffer,
  56                    size_t buflen, struct passwd **result)
  57 {
  58   char buf[3 * sizeof (uid_t)];
  59   buf[sizeof (buf) - 1] = '\0';
  60   char *cp = _itoa_word (uid, buf + sizeof (buf) - 1, 10, 0);
  61
  62   return nscd_getpw_r (cp, buf + sizeof (buf) - cp, GETPWBYUID, resultbuf,
  63                        buffer, buflen, result);
  64 }
  65
  66
  67 static int
  68 internal_function
  69 nscd_getpw_r (const char *key, size_t keylen, request_type type,
  70               struct passwd *resultbuf, char *buffer, size_t buflen,
  71               struct passwd **result)
  72 {
  73   pw_response_header pw_resp;
  74   int sock = __nscd_open_socket (key, keylen, type, &pw_resp,
  75                                  sizeof (pw_resp));
  76   if (sock == -1)
  77     {
  78       __nss_not_use_nscd_passwd = 1;
  79       return -1;
  80     }
  81
  82   /* No value found so far.  */
  83   int retval = -1;
  84   *result = NULL;
  85
  86   if (__builtin_expect (pw_resp.found == -1, 0))
  87     {
  88       /* The daemon does not cache this database.  */
  89       __nss_not_use_nscd_passwd = 1;
  90       goto out;
  91     }
  92
  93   if (pw_resp.found == 1)
  94     {
  95       char *p = buffer;
  96       size_t total = (pw_resp.pw_name_len + pw_resp.pw_passwd_len
  97                       + pw_resp.pw_gecos_len + pw_resp.pw_dir_len
  98                       + pw_resp.pw_shell_len);
  99
 100       if (__builtin_expect (buflen < total, 0))
 101         {
 102           __set_errno (ERANGE);
 103           retval = ERANGE;
 104           goto out;
 105         }
 106
 107       /* Set the information we already have.  */
 108       resultbuf->pw_uid = pw_resp.pw_uid;
 109       resultbuf->pw_gid = pw_resp.pw_gid;
 110
 111       /* get pw_name */
 112       resultbuf->pw_name = p;
 113       p += pw_resp.pw_name_len;
 114       /* get pw_passwd */
 115       resultbuf->pw_passwd = p;
 116       p += pw_resp.pw_passwd_len;
 117       /* get pw_gecos */
 118       resultbuf->pw_gecos = p;
 119       p += pw_resp.pw_gecos_len;
 120       /* get pw_dir */
 121       resultbuf->pw_dir = p;
 122       p += pw_resp.pw_dir_len;
 123       /* get pw_pshell */
 124       resultbuf->pw_shell = p;
 125
 126       ssize_t nbytes = TEMP_FAILURE_RETRY (__read (sock, buffer, total));
 127
 128       if (nbytes == (ssize_t) total)
 129         {
 130           retval = 0;
 131           *result = resultbuf;
 132         }
 133     }
 134   else
 135     {
 136       /* The `errno' to some value != ERANGE.  */
 137       __set_errno (ENOENT);
 138       /* Even though we have not found anything, the result is zero.  */
 139       retval = 0;
 140     }
 141
 142  out:
 143   close_not_cancel_no_status (sock);
 144
 145   return retval;
 146 }