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FreeBSD/Linux Kernel Cross Reference
sys/nss/getXXbyYY.c

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    1 /* Copyright (C) 1996-2001,2003, 2004 Free Software Foundation, Inc.
    2    This file is part of the GNU C Library.
    3 
    4    The GNU C Library is free software; you can redistribute it and/or
    5    modify it under the terms of the GNU Lesser General Public
    6    License as published by the Free Software Foundation; either
    7    version 2.1 of the License, or (at your option) any later version.
    8 
    9    The GNU C Library is distributed in the hope that it will be useful,
   10    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12    Lesser General Public License for more details.
   13 
   14    You should have received a copy of the GNU Lesser General Public
   15    License along with the GNU C Library; if not, write to the Free
   16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17    02111-1307 USA.  */
   18 
   19 #include <assert.h>
   20 #include <errno.h>
   21 #include <bits/libc-lock.h>
   22 #include <stdlib.h>
   23 #include <resolv.h>
   24 
   25 #include "nsswitch.h"
   26 
   27 /*******************************************************************\
   28 |* Here we assume several symbols to be defined:                   *|
   29 |*                                                                 *|
   30 |* LOOKUP_TYPE   - the return type of the function                 *|
   31 |*                                                                 *|
   32 |* FUNCTION_NAME - name of the non-reentrant function              *|
   33 |*                                                                 *|
   34 |* DATABASE_NAME - name of the database the function accesses      *|
   35 |*                 (e.g., host, services, ...)                     *|
   36 |*                                                                 *|
   37 |* ADD_PARAMS    - additional parameter, can vary in number        *|
   38 |*                                                                 *|
   39 |* ADD_VARIABLES - names of additional parameter                   *|
   40 |*                                                                 *|
   41 |* BUFLEN        - length of buffer allocated for the non          *|
   42 |*                 reentrant version                               *|
   43 |*                                                                 *|
   44 |* Optionally the following vars can be defined:                   *|
   45 |*                                                                 *|
   46 |* NEED_H_ERRNO  - an extra parameter will be passed to point to   *|
   47 |*                 the global `h_errno' variable.                  *|
   48 |*                                                                 *|
   49 \*******************************************************************/
   50 
   51 /* To make the real sources a bit prettier.  */
   52 #define REENTRANT_NAME APPEND_R (FUNCTION_NAME)
   53 #define APPEND_R(name) APPEND_R1 (name)
   54 #define APPEND_R1(name) name##_r
   55 #define INTERNAL(name) INTERNAL1 (name)
   56 #define INTERNAL1(name) __##name
   57 
   58 /* Sometimes we need to store error codes in the `h_errno' variable.  */
   59 #ifdef NEED_H_ERRNO
   60 # define H_ERRNO_PARM , int *h_errnop
   61 # define H_ERRNO_VAR , &h_errno_tmp
   62 # define H_ERRNO_VAR_P &h_errno_tmp
   63 #else
   64 # define H_ERRNO_PARM
   65 # define H_ERRNO_VAR
   66 # define H_ERRNO_VAR_P NULL
   67 #endif
   68 
   69 #ifdef HAVE_AF
   70 # define AF_VAL af
   71 #else
   72 # define AF_VAL AF_INET
   73 #endif
   74 
   75 /* Prototype for reentrant version we use here.  */
   76 extern int INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf,
   77                                       char *buffer, size_t buflen,
   78                                       LOOKUP_TYPE **result H_ERRNO_PARM);
   79 
   80 /* We need to protect the dynamic buffer handling.  */
   81 __libc_lock_define_initialized (static, lock);
   82 
   83 /* This points to the static buffer used.  */
   84 libc_freeres_ptr (static char *buffer);
   85 
   86 
   87 LOOKUP_TYPE *
   88 FUNCTION_NAME (ADD_PARAMS)
   89 {
   90   static size_t buffer_size;
   91   static LOOKUP_TYPE resbuf;
   92   LOOKUP_TYPE *result;
   93 #ifdef NEED_H_ERRNO
   94   int h_errno_tmp = 0;
   95 #endif
   96 
   97   /* Get lock.  */
   98   __libc_lock_lock (lock);
   99 
  100   if (buffer == NULL)
  101     {
  102       buffer_size = BUFLEN;
  103       buffer = (char *) malloc (buffer_size);
  104     }
  105 
  106 #ifdef HANDLE_DIGITS_DOTS
  107   if (buffer != NULL)
  108     {
  109       if (__nss_hostname_digits_dots (name, &resbuf, &buffer,
  110                                       &buffer_size, 0, &result, NULL, AF_VAL,
  111                                       H_ERRNO_VAR_P))
  112         goto done;
  113     }
  114 #endif
  115 
  116   while (buffer != NULL
  117          && (INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, &resbuf, buffer,
  118                                         buffer_size, &result H_ERRNO_VAR)
  119              == ERANGE)
  120 #ifdef NEED_H_ERRNO
  121          && h_errno_tmp == NETDB_INTERNAL
  122 #endif
  123          )
  124     {
  125       char *new_buf;
  126       buffer_size *= 2;
  127       new_buf = (char *) realloc (buffer, buffer_size);
  128       if (new_buf == NULL)
  129         {
  130           /* We are out of memory.  Free the current buffer so that the
  131              process gets a chance for a normal termination.  */
  132           free (buffer);
  133           __set_errno (ENOMEM);
  134         }
  135       buffer = new_buf;
  136     }
  137 
  138   if (buffer == NULL)
  139     result = NULL;
  140 
  141 #ifdef HANDLE_DIGITS_DOTS
  142 done:
  143 #endif
  144   /* Release lock.  */
  145   __libc_lock_unlock (lock);
  146 
  147 #ifdef NEED_H_ERRNO
  148   if (h_errno_tmp != 0)
  149     __set_h_errno (h_errno_tmp);
  150 #endif
  151 
  152   return result;
  153 }
  154 
  155 static_link_warning (FUNCTION_NAME)

Cache object: 5454f33e8e6a073e037b056803c00028


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