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 static int __nscd_getpw_r (const char *key, request_type type,
  33                            struct passwd *resultbuf, char *buffer,
  34                            size_t buflen);
  35
  36 int
  37 __nscd_getpwnam_r (const char *name, struct passwd *resultbuf, char *buffer,
  38                    size_t buflen)
  39 {
  40   if (name == NULL)
  41     return 1;
  42
  43   return __nscd_getpw_r (name, GETPWBYNAME, resultbuf, buffer, buflen);
  44 }
  45
  46 int
  47 __nscd_getpwuid_r (uid_t uid, struct passwd *resultbuf, char *buffer,
  48                    size_t buflen)
  49 {
  50   char *p = buffer;
  51   char plen;
  52
  53   plen = snprintf (buffer, buflen, "%d", uid);
  54   if (plen == -1)
  55     {
  56       __set_errno (ERANGE);
  57       return -1;
  58     }
  59   p = buffer + plen + 1;
  60
  61   return __nscd_getpw_r (buffer, GETPWBYUID, 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_getpw_r (const char *key, request_type type, struct passwd *resultbuf,
  93                 char *buffer, size_t buflen)
  94 {
  95   int sock = nscd_open_socket ();
  96   request_header req;
  97   pw_response_header pw_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, &pw_resp, sizeof (pw_response_header));
 121   if (nbytes != sizeof (pw_response_header))
 122     {
 123       close (sock);
 124       return 1;
 125     }
 126
 127   if (pw_resp.found == -1)
 128     {
 129       close (sock);
 130       return 1;
 131     }
 132
 133   if (pw_resp.found == 1)
 134     {
 135       struct iovec vec[5];
 136       char *p = buffer;
 137
 138       if (buflen < pw_resp.pw_name_len + 1 + pw_resp.pw_passwd_len + 1
 139           + pw_resp.pw_gecos_len + 1 + pw_resp.pw_dir_len + 1
 140           + pw_resp.pw_shell_len + 1)
 141         {
 142           __set_errno (ERANGE);
 143           close (sock);
 144           return -1;
 145         }
 146
 147       /* get pw_name */
 148       vec[0].iov_base = p;
 149       vec[0].iov_len = pw_resp.pw_name_len;
 150       p += pw_resp.pw_name_len + 1;
 151       buflen -= (pw_resp.pw_name_len + 1);
 152       /* get pw_passwd */
 153       vec[1].iov_base = p;
 154       vec[1].iov_len = pw_resp.pw_passwd_len;
 155       p += pw_resp.pw_passwd_len + 1;
 156       buflen -= (pw_resp.pw_passwd_len + 1);
 157       /* get pw_gecos */
 158       vec[2].iov_base = p;
 159       vec[2].iov_len = pw_resp.pw_gecos_len;
 160       p += pw_resp.pw_gecos_len + 1;
 161       buflen -= (pw_resp.pw_gecos_len + 1);
 162       /* get pw_dir */
 163       vec[3].iov_base = p;
 164       vec[3].iov_len = pw_resp.pw_dir_len;
 165       p += pw_resp.pw_dir_len + 1;
 166       buflen -= (pw_resp.pw_dir_len + 1);
 167       /* get pw_pshell */
 168       vec[4].iov_base = p;
 169       vec[4].iov_len = pw_resp.pw_dir_len;
 170       p += pw_resp.pw_dir_len + 1;
 171       buflen -= (pw_resp.pw_dir_len + 1);
 172
 173       nbytes = readv (sock, vec, 5);
 174       if (nbytes !=  pw_resp.pw_name_len + 1 + pw_resp.pw_passwd_len + 1 +
 175           pw_resp.pw_gecos_len + 1 + pw_resp.pw_dir_len + 1 +
 176           pw_resp.pw_shell_len + 1)
 177         {
 178           close (sock);
 179           return 1;
 180         }
 181
 182       resultbuf->pw_name = vec[0].iov_base;
 183       resultbuf->pw_name[pw_resp.pw_name_len] = '\0';
 184       resultbuf->pw_passwd = vec[1].iov_base;
 185       resultbuf->pw_passwd[pw_resp.pw_passwd_len] = '\0';
 186       resultbuf->pw_uid = pw_resp.pw_uid;
 187       resultbuf->pw_gid = pw_resp.pw_gid;
 188       resultbuf->pw_gecos = vec[2].iov_base;
 189       resultbuf->pw_gecos[pw_resp.pw_gecos_len] = '\0';
 190       resultbuf->pw_dir = vec[3].iov_base;
 191       resultbuf->pw_dir[pw_resp.pw_dir_len] = '\0';
 192       resultbuf->pw_shell = vec[4].iov_base;
 193       resultbuf->pw_shell[pw_resp.pw_shell_len] = '\0';
 194
 195       close (sock);
 196       return 0;
 197     }
 198   else
 199     {
 200       close (sock);
 201       return -1;
 202     }
 203 }