mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 14:30:06 +00:00
155 lines
4.2 KiB
C
155 lines
4.2 KiB
C
/* Copyright (C) 1996-2015 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <bits/libc-lock.h>
|
|
#include <stdlib.h>
|
|
#include <resolv.h>
|
|
|
|
#include "nsswitch.h"
|
|
|
|
/*******************************************************************\
|
|
|* Here we assume several symbols to be defined: *|
|
|
|* *|
|
|
|* LOOKUP_TYPE - the return type of the function *|
|
|
|* *|
|
|
|* FUNCTION_NAME - name of the non-reentrant function *|
|
|
|* *|
|
|
|* DATABASE_NAME - name of the database the function accesses *|
|
|
|* (e.g., host, services, ...) *|
|
|
|* *|
|
|
|* ADD_PARAMS - additional parameter, can vary in number *|
|
|
|* *|
|
|
|* ADD_VARIABLES - names of additional parameter *|
|
|
|* *|
|
|
|* BUFLEN - length of buffer allocated for the non *|
|
|
|* reentrant version *|
|
|
|* *|
|
|
|* Optionally the following vars can be defined: *|
|
|
|* *|
|
|
|* NEED_H_ERRNO - an extra parameter will be passed to point to *|
|
|
|* the global `h_errno' variable. *|
|
|
|* *|
|
|
\*******************************************************************/
|
|
|
|
/* To make the real sources a bit prettier. */
|
|
#define REENTRANT_NAME APPEND_R (FUNCTION_NAME)
|
|
#define APPEND_R(name) APPEND_R1 (name)
|
|
#define APPEND_R1(name) name##_r
|
|
#define INTERNAL(name) INTERNAL1 (name)
|
|
#define INTERNAL1(name) __##name
|
|
|
|
/* Sometimes we need to store error codes in the `h_errno' variable. */
|
|
#ifdef NEED_H_ERRNO
|
|
# define H_ERRNO_PARM , int *h_errnop
|
|
# define H_ERRNO_VAR , &h_errno_tmp
|
|
# define H_ERRNO_VAR_P &h_errno_tmp
|
|
#else
|
|
# define H_ERRNO_PARM
|
|
# define H_ERRNO_VAR
|
|
# define H_ERRNO_VAR_P NULL
|
|
#endif
|
|
|
|
#ifdef HAVE_AF
|
|
# define AF_VAL af
|
|
#else
|
|
# define AF_VAL AF_INET
|
|
#endif
|
|
|
|
/* Prototype for reentrant version we use here. */
|
|
extern int INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf,
|
|
char *buffer, size_t buflen,
|
|
LOOKUP_TYPE **result H_ERRNO_PARM);
|
|
|
|
/* We need to protect the dynamic buffer handling. */
|
|
__libc_lock_define_initialized (static, lock);
|
|
|
|
/* This points to the static buffer used. */
|
|
libc_freeres_ptr (static char *buffer);
|
|
|
|
|
|
LOOKUP_TYPE *
|
|
FUNCTION_NAME (ADD_PARAMS)
|
|
{
|
|
static size_t buffer_size;
|
|
static LOOKUP_TYPE resbuf;
|
|
LOOKUP_TYPE *result;
|
|
#ifdef NEED_H_ERRNO
|
|
int h_errno_tmp = 0;
|
|
#endif
|
|
|
|
/* Get lock. */
|
|
__libc_lock_lock (lock);
|
|
|
|
if (buffer == NULL)
|
|
{
|
|
buffer_size = BUFLEN;
|
|
buffer = (char *) malloc (buffer_size);
|
|
}
|
|
|
|
#ifdef HANDLE_DIGITS_DOTS
|
|
if (buffer != NULL)
|
|
{
|
|
if (__nss_hostname_digits_dots (name, &resbuf, &buffer,
|
|
&buffer_size, 0, &result, NULL, AF_VAL,
|
|
H_ERRNO_VAR_P))
|
|
goto done;
|
|
}
|
|
#endif
|
|
|
|
while (buffer != NULL
|
|
&& (INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, &resbuf, buffer,
|
|
buffer_size, &result H_ERRNO_VAR)
|
|
== ERANGE)
|
|
#ifdef NEED_H_ERRNO
|
|
&& h_errno_tmp == NETDB_INTERNAL
|
|
#endif
|
|
)
|
|
{
|
|
char *new_buf;
|
|
buffer_size *= 2;
|
|
new_buf = (char *) realloc (buffer, buffer_size);
|
|
if (new_buf == NULL)
|
|
{
|
|
/* We are out of memory. Free the current buffer so that the
|
|
process gets a chance for a normal termination. */
|
|
free (buffer);
|
|
__set_errno (ENOMEM);
|
|
}
|
|
buffer = new_buf;
|
|
}
|
|
|
|
if (buffer == NULL)
|
|
result = NULL;
|
|
|
|
#ifdef HANDLE_DIGITS_DOTS
|
|
done:
|
|
#endif
|
|
/* Release lock. */
|
|
__libc_lock_unlock (lock);
|
|
|
|
#ifdef NEED_H_ERRNO
|
|
if (h_errno_tmp != 0)
|
|
__set_h_errno (h_errno_tmp);
|
|
#endif
|
|
|
|
return result;
|
|
}
|
|
|
|
nss_interface_function (FUNCTION_NAME)
|