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.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 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_getpw_r (const char *key, request_type type, struct passwd *resultbuf,
  95                 char *buffer, size_t buflen)
  96 {
  97   int sock = nscd_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);
 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       struct iovec vec[5];
 143       char *p = buffer;
 144
 145       if (buflen < (pw_resp.pw_name_len + 1 + pw_resp.pw_passwd_len + 1
 146                     + pw_resp.pw_gecos_len + 1 + pw_resp.pw_dir_len + 1
 147                     + pw_resp.pw_shell_len + 1))
 148         {
 149           __set_errno (ERANGE);
 150           close (sock);
 151           return -1;
 152         }
 153
 154       /* get pw_name */
 155       vec[0].iov_base = p;
 156       vec[0].iov_len = pw_resp.pw_name_len;
 157       p += pw_resp.pw_name_len + 1;
 158       buflen -= (pw_resp.pw_name_len + 1);
 159       /* get pw_passwd */
 160       vec[1].iov_base = p;
 161       vec[1].iov_len = pw_resp.pw_passwd_len;
 162       p += pw_resp.pw_passwd_len + 1;
 163       buflen -= (pw_resp.pw_passwd_len + 1);
 164       /* get pw_gecos */
 165       vec[2].iov_base = p;
 166       vec[2].iov_len = pw_resp.pw_gecos_len;
 167       p += pw_resp.pw_gecos_len + 1;
 168       buflen -= (pw_resp.pw_gecos_len + 1);
 169       /* get pw_dir */
 170       vec[3].iov_base = p;
 171       vec[3].iov_len = pw_resp.pw_dir_len;
 172       p += pw_resp.pw_dir_len + 1;
 173       buflen -= (pw_resp.pw_dir_len + 1);
 174       /* get pw_pshell */
 175       vec[4].iov_base = p;
 176       vec[4].iov_len = pw_resp.pw_shell_len;
 177       p += pw_resp.pw_shell_len + 1;
 178       buflen -= (pw_resp.pw_shell_len + 1);
 179
 180       nbytes = __readv (sock, vec, 5);
 181       if (nbytes !=  (pw_resp.pw_name_len + pw_resp.pw_passwd_len
 182                       + pw_resp.pw_gecos_len + pw_resp.pw_dir_len
 183                       + pw_resp.pw_shell_len))
 184         {
 185           close (sock);
 186           return 1;
 187         }
 188
 189       resultbuf->pw_name = vec[0].iov_base;
 190       resultbuf->pw_name[pw_resp.pw_name_len] = '\0';
 191       resultbuf->pw_passwd = vec[1].iov_base;
 192       resultbuf->pw_passwd[pw_resp.pw_passwd_len] = '\0';
 193       resultbuf->pw_uid = pw_resp.pw_uid;
 194       resultbuf->pw_gid = pw_resp.pw_gid;
 195       resultbuf->pw_gecos = vec[2].iov_base;
 196       resultbuf->pw_gecos[pw_resp.pw_gecos_len] = '\0';
 197       resultbuf->pw_dir = vec[3].iov_base;
 198       resultbuf->pw_dir[pw_resp.pw_dir_len] = '\0';
 199       resultbuf->pw_shell = vec[4].iov_base;
 200       resultbuf->pw_shell[pw_resp.pw_shell_len] = '\0';
 201
 202       close (sock);
 203       return 0;
 204     }
 205   else
 206     {
 207       close (sock);
 208       return -1;
 209     }
 210 }