nscd/nscd_getgr_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 <grp.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/un.h>
  28
  29 #include "nscd.h"
  30 #include "nscd_proto.h"
  31
  32 int __nss_not_use_nscd_group;
  33
  34 static int __nscd_getgr_r (const char *key, request_type type,
  35                            struct group *resultbuf, char *buffer,
  36                            size_t buflen);
  37
  38 int
  39 __nscd_getgrnam_r (const char *name, struct group *resultbuf, char *buffer,
  40                    size_t buflen)
  41 {
  42   if (name == NULL)
  43     return 1;
  44
  45   return __nscd_getgr_r (name, GETGRBYNAME, resultbuf, buffer, buflen);
  46 }
  47
  48 int
  49 __nscd_getgrgid_r (gid_t gid, struct group *resultbuf, char *buffer,
  50                    size_t buflen)
  51 {
  52   char *p = buffer;
  53   int plen;
  54
  55   plen = snprintf (buffer, buflen, "%d", gid);
  56   if (plen == -1)
  57     {
  58       __set_errno (ERANGE);
  59       return -1;
  60     }
  61   p = buffer + plen + 1;
  62
  63   return __nscd_getgr_r (buffer, GETGRBYGID, resultbuf, p, buflen - plen -1);
  64 }
  65
  66 /* Create a socket connected to a name. */
  67 static int
  68 nscd_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_getgr_r (const char *key, request_type type, struct group *resultbuf,
  95                 char *buffer, size_t buflen)
  96 {
  97   int sock = nscd_open_socket ();
  98   request_header req;
  99   gr_response_header gr_resp;
 100   ssize_t nbytes;
 101
 102   if (sock == -1)
 103     {
 104       __nss_not_use_nscd_group = 1;
 105       return 1;
 106     }
 107
 108   req.version = NSCD_VERSION;
 109   req.type = type;
 110   req.key_len = strlen (key);
 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, &gr_resp, sizeof (gr_response_header));
 126   if (nbytes != sizeof (gr_response_header))
 127     {
 128       close (sock);
 129       return 1;
 130     }
 131
 132   if (gr_resp.found == -1)
 133     {
 134       /* The daemon does not cache this database.  */
 135       close (sock);
 136       __nss_not_use_nscd_group = 1;
 137       return 1;
 138     }
 139
 140   if (gr_resp.found == 1)
 141     {
 142       size_t i;
 143       char *p = buffer;
 144
 145       if (buflen < gr_resp.gr_name_len + 1)
 146         {
 147           __set_errno (ERANGE);
 148           close (sock);
 149           return -1;
 150         }
 151       resultbuf->gr_name = p;
 152       p += gr_resp.gr_name_len + 1;
 153       buflen -= (gr_resp.gr_name_len + 1);
 154       nbytes = read (sock, resultbuf->gr_name, gr_resp.gr_name_len);
 155       if (nbytes != gr_resp.gr_name_len)
 156         {
 157           close (sock);
 158           return 1;
 159         }
 160       resultbuf->gr_name[gr_resp.gr_name_len] = '\0';
 161
 162       if (buflen < gr_resp.gr_passwd_len + 1)
 163         {
 164           __set_errno (ERANGE);
 165           close (sock);
 166           return -1;
 167         }
 168       resultbuf->gr_passwd = p;
 169       p += gr_resp.gr_passwd_len + 1;
 170       buflen -= (gr_resp.gr_passwd_len + 1);
 171       nbytes = read (sock, resultbuf->gr_passwd, gr_resp.gr_passwd_len);
 172       if (nbytes != gr_resp.gr_passwd_len)
 173         {
 174           close (sock);
 175           return 1;
 176         }
 177       resultbuf->gr_passwd[gr_resp.gr_passwd_len] = '\0';
 178
 179       resultbuf->gr_gid = gr_resp.gr_gid;
 180
 181       if (buflen < ((gr_resp.gr_mem_len + 1) * sizeof (char *)))
 182         {
 183           __set_errno (ERANGE);
 184           close (sock);
 185           return -1;
 186         }
 187       resultbuf->gr_mem = (char **)p;
 188       p += ((gr_resp.gr_mem_len + 1) * sizeof (char *));
 189       buflen -= ((gr_resp.gr_mem_len + 1) * sizeof (char *));
 190
 191       resultbuf->gr_mem[gr_resp.gr_mem_len] = NULL;
 192
 193       for (i = 0; i < gr_resp.gr_mem_len; ++i)
 194         {
 195           size_t len;
 196           nbytes = read (sock, &len, sizeof (len));
 197           if (nbytes != sizeof (len))
 198             {
 199               close (sock);
 200               return 1;
 201             }
 202
 203           if (buflen < (len + 1))
 204             {
 205               __set_errno (ERANGE);
 206               close (sock);
 207               return -1;
 208             }
 209           resultbuf->gr_mem[i] = p;
 210           p += len + 1;
 211           buflen -= (len + 1);
 212           nbytes = read (sock, resultbuf->gr_mem[i], len);
 213           resultbuf->gr_mem[i][len] = '\0';
 214           if (nbytes != len)
 215             {
 216               close (sock);
 217               return 1;
 218             }
 219         }
 220       close (sock);
 221       return 0;
 222     }
 223   else
 224     {
 225       close (sock);
 226       return -1;
 227     }
 228 }