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 static int __nscd_getgr_r (const char *key, request_type type,
  33                            struct group *resultbuf, char *buffer,
  34                            size_t buflen);
  35
  36 int
  37 __nscd_getgrnam_r (const char *name, struct group *resultbuf, char *buffer,
  38                    size_t buflen)
  39 {
  40   if (name == NULL)
  41     return 1;
  42
  43   return __nscd_getgr_r (name, GETGRBYNAME, resultbuf, buffer, buflen);
  44 }
  45
  46 int
  47 __nscd_getgrgid_r (gid_t gid, struct group *resultbuf, char *buffer,
  48                    size_t buflen)
  49 {
  50   char *p = buffer;
  51   char plen;
  52
  53   plen = snprintf (buffer, buflen, "%d", gid);
  54   if (plen == -1)
  55     {
  56       __set_errno (ERANGE);
  57       return -1;
  58     }
  59   p = buffer + plen + 1;
  60
  61   return __nscd_getgr_r (buffer, GETGRBYGID, resultbuf, p, buflen - plen -1);
  62 }
  63
  64 /* Create a socket connected to a name. */
  65 static int
  66 nscd_open_socket (void)
  67 {
  68   struct sockaddr_un addr;
  69   int sock;
  70   int saved_errno = errno;
  71
  72   sock = socket (PF_UNIX, SOCK_STREAM, 0);
  73   if (sock < 0)
  74     {
  75       __set_errno (saved_errno);
  76       return -1;
  77     }
  78
  79   addr.sun_family = AF_UNIX;
  80   strcpy (addr.sun_path, _PATH_NSCDSOCKET);
  81   if (connect (sock, (struct sockaddr *) &addr, sizeof (addr)) < 0)
  82     {
  83       close (sock);
  84       __set_errno (saved_errno);
  85       return -1;
  86     }
  87
  88   return sock;
  89 }
  90
  91 static int
  92 __nscd_getgr_r (const char *key, request_type type, struct group *resultbuf,
  93                 char *buffer, size_t buflen)
  94 {
  95   int sock = nscd_open_socket ();
  96   request_header req;
  97   gr_response_header gr_resp;
  98   ssize_t nbytes;
  99
 100   if (sock == -1)
 101     return 1;
 102
 103   req.version = NSCD_VERSION;
 104   req.type = type;
 105   req.key_len = strlen (key);
 106   nbytes = write (sock, &req, sizeof (request_header));
 107   if (nbytes != sizeof (request_header))
 108     {
 109       close (sock);
 110       return 1;
 111     }
 112
 113   nbytes = write (sock, key, req.key_len);
 114   if (nbytes != req.key_len)
 115     {
 116       close (sock);
 117       return 1;
 118     }
 119
 120   nbytes = read (sock, &gr_resp, sizeof (gr_response_header));
 121   if (nbytes != sizeof (gr_response_header))
 122     {
 123       close (sock);
 124       return 1;
 125     }
 126
 127   if (gr_resp.found == -1)
 128     {
 129       close (sock);
 130       return 1;
 131     }
 132
 133   if (gr_resp.found == 1)
 134     {
 135       size_t i;
 136       char *p = buffer;
 137
 138       if (buflen < gr_resp.gr_name_len + 1)
 139         {
 140           __set_errno (ERANGE);
 141           close (sock);
 142           return -1;
 143         }
 144       resultbuf->gr_name = p;
 145       p += gr_resp.gr_name_len + 1;
 146       buflen -= (gr_resp.gr_name_len + 1);
 147       nbytes = read (sock, resultbuf->gr_name, gr_resp.gr_name_len);
 148       if (nbytes != gr_resp.gr_name_len)
 149         {
 150           close (sock);
 151           return 1;
 152         }
 153       resultbuf->gr_name[gr_resp.gr_name_len] = '\0';
 154
 155       if (buflen < gr_resp.gr_passwd_len + 1)
 156         {
 157           __set_errno (ERANGE);
 158           close (sock);
 159           return -1;
 160         }
 161       resultbuf->gr_passwd = p;
 162       p += gr_resp.gr_passwd_len + 1;
 163       buflen -= (gr_resp.gr_passwd_len + 1);
 164       nbytes = read (sock, resultbuf->gr_passwd, gr_resp.gr_passwd_len);
 165       if (nbytes != gr_resp.gr_passwd_len)
 166         {
 167           close (sock);
 168           return 1;
 169         }
 170       resultbuf->gr_passwd[gr_resp.gr_passwd_len] = '\0';
 171
 172       resultbuf->gr_gid = gr_resp.gr_gid;
 173
 174       if (buflen < ((gr_resp.gr_mem_len + 1) * sizeof (char *)))
 175         {
 176           __set_errno (ERANGE);
 177           close (sock);
 178           return -1;
 179         }
 180       resultbuf->gr_mem = (char **)p;
 181       p += ((gr_resp.gr_mem_len + 1) * sizeof (char *));
 182       buflen -= ((gr_resp.gr_mem_len + 1) * sizeof (char *));
 183
 184       resultbuf->gr_mem[gr_resp.gr_mem_len] = NULL;
 185
 186       for (i = 0; i < gr_resp.gr_mem_len; ++i)
 187         {
 188           size_t len;
 189           nbytes = read (sock, &len, sizeof (len));
 190           if (nbytes != sizeof (len))
 191             {
 192               close (sock);
 193               return 1;
 194             }
 195
 196           if (buflen < (len + 1))
 197             {
 198               __set_errno (ERANGE);
 199               close (sock);
 200               return -1;
 201             }
 202           resultbuf->gr_mem[i] = p;
 203           p += len + 1;
 204           buflen -= (len + 1);
 205           nbytes = read (sock, resultbuf->gr_mem[i], len);
 206           resultbuf->gr_mem[i][len] = '\0';
 207           if (nbytes != len)
 208             {
 209               close (sock);
 210               return 1;
 211             }
 212         }
 213       close (sock);
 214       return 0;
 215     }
 216   else
 217     {
 218       close (sock);
 219       return -1;
 220     }
 221 }