nscd/nscd_getpw_r.c

   1 /* Copyright (C) 1998 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <pwd.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/socket.h>
  27 #include <sys/uio.h>
  28 #include <sys/un.h>
  29
  30 #include "nscd-client.h"
  31
  32 int __nss_not_use_nscd_passwd;
  33
  34 static int nscd_getpw_r (const char *key, request_type type,
  35                          struct passwd *resultbuf, char *buffer,
  36                          size_t buflen);
  37
  38 int
  39 __nscd_getpwnam_r (const char *name, struct passwd *resultbuf, char *buffer,
  40                    size_t buflen)
  41 {
  42   if (name == NULL)
  43     return 1;
  44
  45   return nscd_getpw_r (name, GETPWBYNAME, resultbuf, buffer, buflen);
  46 }
  47
  48 int
  49 __nscd_getpwuid_r (uid_t uid, struct passwd *resultbuf, char *buffer,
  50                    size_t buflen)
  51 {
  52   char *p = buffer;
  53   int plen;
  54
  55   plen = __snprintf (buffer, buflen, "%d", uid);
  56   if (plen == -1)
  57     {
  58       __set_errno (ERANGE);
  59       return -1;
  60     }
  61   p = buffer + plen + 1;
  62
  63   return nscd_getpw_r (buffer, GETPWBYUID, resultbuf, p, buflen - plen - 1);
  64 }
  65
  66 /* Create a socket connected to a name. */
  67 static int
  68 open_socket (void)
  69 {
  70   struct sockaddr_un addr;
  71   int sock;
  72   int saved_errno = errno;
  73
  74   sock = __socket (PF_UNIX, SOCK_STREAM, 0);
  75   if (sock < 0)
  76     {
  77       __set_errno (saved_errno);
  78       return -1;
  79     }
  80
  81   addr.sun_family = AF_UNIX;
  82   strcpy (addr.sun_path, _PATH_NSCDSOCKET);
  83   if (__connect (sock, (struct sockaddr *) &addr, sizeof (addr)) < 0)
  84     {
  85       __close (sock);
  86       __set_errno (saved_errno);
  87       return -1;
  88     }
  89
  90   return sock;
  91 }
  92
  93 static int
  94 nscd_getpw_r (const char *key, request_type type, struct passwd *resultbuf,
  95               char *buffer, size_t buflen)
  96 {
  97   int sock = open_socket ();
  98   request_header req;
  99   pw_response_header pw_resp;
 100   ssize_t nbytes;
 101
 102   if (sock == -1)
 103     {
 104       __nss_not_use_nscd_passwd = 1;
 105       return 1;
 106     }
 107
 108   req.version = NSCD_VERSION;
 109   req.type = type;
 110   req.key_len = strlen (key) + 1;
 111   nbytes = __write (sock, &req, sizeof (request_header));
 112   if (nbytes != sizeof (request_header))
 113     {
 114       __close (sock);
 115       return 1;
 116     }
 117
 118   nbytes = __write (sock, key, req.key_len);
 119   if (nbytes != req.key_len)
 120     {
 121       __close (sock);
 122       return 1;
 123     }
 124
 125   nbytes = __read (sock, &pw_resp, sizeof (pw_response_header));
 126   if (nbytes != sizeof (pw_response_header))
 127     {
 128       __close (sock);
 129       return 1;
 130     }
 131
 132   if (pw_resp.found == -1)
 133     {
 134       /* The daemon does not cache this database.  */
 135       __close (sock);
 136       __nss_not_use_nscd_passwd = 1;
 137       return 1;
 138     }
 139
 140   if (pw_resp.found == 1)
 141     {
 142       char *p = buffer;
 143       size_t total = (pw_resp.pw_name_len + pw_resp.pw_passwd_len
 144                       + pw_resp.pw_gecos_len + pw_resp.pw_dir_len
 145                       + pw_resp.pw_shell_len);
 146
 147       if (buflen < total)
 148         {
 149           __set_errno (ERANGE);
 150           __close (sock);
 151           return -1;
 152         }
 153
 154       /* Set the information we already have.  */
 155       resultbuf->pw_uid = pw_resp.pw_uid;
 156       resultbuf->pw_gid = pw_resp.pw_gid;
 157
 158       /* get pw_name */
 159       resultbuf->pw_name = p;
 160       p += pw_resp.pw_name_len;
 161       /* get pw_passwd */
 162       resultbuf->pw_passwd = p;
 163       p += pw_resp.pw_passwd_len;
 164       /* get pw_gecos */
 165       resultbuf->pw_gecos = p;
 166       p += pw_resp.pw_gecos_len;
 167       /* get pw_dir */
 168       resultbuf->pw_dir = p;
 169       p += pw_resp.pw_dir_len;
 170       /* get pw_pshell */
 171       resultbuf->pw_shell = p;
 172
 173       nbytes = __read (sock, buffer, total);
 174
 175       __close (sock);
 176
 177       return nbytes == total ? 0 : 1;
 178     }
 179   else
 180     {
 181       __close (sock);
 182       return -1;
 183     }
 184 }