nscd/nscd_getpw_r.c

   1 /* Copyright (C) 1998, 1999, 2003 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
  31 #include "nscd-client.h"
  32 #include "nscd_proto.h"
  33
  34 int __nss_not_use_nscd_passwd;
  35
  36 static int nscd_getpw_r (const char *key, size_t keylen, request_type type,
  37                          struct passwd *resultbuf, char *buffer,
  38                          size_t buflen) internal_function;
  39
  40 int
  41 __nscd_getpwnam_r (const char *name, struct passwd *resultbuf, char *buffer,
  42                    size_t buflen)
  43 {
  44   if (name == NULL)
  45     return -1;
  46
  47   return nscd_getpw_r (name, strlen (name) + 1, GETPWBYNAME, resultbuf,
  48                        buffer, buflen);
  49 }
  50
  51 int
  52 __nscd_getpwuid_r (uid_t uid, struct passwd *resultbuf, char *buffer,
  53                    size_t buflen)
  54 {
  55   char buf[12];
  56   size_t n;
  57
  58   n = __snprintf (buf, sizeof (buf), "%d", uid) + 1;
  59
  60   return nscd_getpw_r (buf, n, GETPWBYUID, resultbuf, buffer, buflen);
  61 }
  62
  63
  64 static int
  65 internal_function
  66 nscd_getpw_r (const char *key, size_t keylen, request_type type,
  67               struct passwd *resultbuf, char *buffer, size_t buflen)
  68 {
  69   int sock = __nscd_open_socket ();
  70   request_header req;
  71   pw_response_header pw_resp;
  72   ssize_t nbytes;
  73   struct iovec vec[2];
  74   int result = -1;
  75
  76   if (sock == -1)
  77     {
  78       __nss_not_use_nscd_passwd = 1;
  79       return -1;
  80     }
  81
  82   req.version = NSCD_VERSION;
  83   req.type = type;
  84   req.key_len = keylen;
  85
  86   vec[0].iov_base = &req;
  87   vec[0].iov_len = sizeof (request_header);
  88   vec[1].iov_base = (void *) key;
  89   vec[1].iov_len = keylen;
  90
  91   nbytes = TEMP_FAILURE_RETRY (__writev (sock, vec, 2));
  92   if (nbytes != (ssize_t) (sizeof (request_header) + keylen))
  93     goto out;
  94
  95   nbytes = TEMP_FAILURE_RETRY (__read (sock, &pw_resp,
  96                                        sizeof (pw_response_header)));
  97   if (nbytes != (ssize_t) sizeof (pw_response_header))
  98     goto out;
  99
 100   if (__builtin_expect (pw_resp.found == -1, 0))
 101     {
 102       /* The daemon does not cache this database.  */
 103       __nss_not_use_nscd_passwd = 1;
 104       goto out;
 105     }
 106
 107   if (pw_resp.found == 1)
 108     {
 109       char *p = buffer;
 110       size_t total = (pw_resp.pw_name_len + pw_resp.pw_passwd_len
 111                       + pw_resp.pw_gecos_len + pw_resp.pw_dir_len
 112                       + pw_resp.pw_shell_len);
 113
 114       if (__builtin_expect (buflen < total, 0))
 115         {
 116           __set_errno (ERANGE);
 117           result = ERANGE;
 118           goto out;
 119         }
 120
 121       /* Set the information we already have.  */
 122       resultbuf->pw_uid = pw_resp.pw_uid;
 123       resultbuf->pw_gid = pw_resp.pw_gid;
 124
 125       /* get pw_name */
 126       resultbuf->pw_name = p;
 127       p += pw_resp.pw_name_len;
 128       /* get pw_passwd */
 129       resultbuf->pw_passwd = p;
 130       p += pw_resp.pw_passwd_len;
 131       /* get pw_gecos */
 132       resultbuf->pw_gecos = p;
 133       p += pw_resp.pw_gecos_len;
 134       /* get pw_dir */
 135       resultbuf->pw_dir = p;
 136       p += pw_resp.pw_dir_len;
 137       /* get pw_pshell */
 138       resultbuf->pw_shell = p;
 139
 140       nbytes = TEMP_FAILURE_RETRY (__read (sock, buffer, total));
 141
 142       if (nbytes == (ssize_t) total)
 143         result = 0;
 144     }
 145   else
 146     {
 147       /* The `errno' to some value != ERANGE.  */
 148       __set_errno (ENOENT);
 149       result = ENOENT;
 150     }
 151
 152  out:
 153   __close (sock);
 154
 155   return result;
 156 }