gnupg/kbx/keybox-init.c

/* keybox-init.c - Initalization of the library 
 *	Copyright (C) 2001 Free Software Foundation, Inc.
 *
 * This file is part of GnuPG.
 *
 * GnuPG is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * GnuPG 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>

#include "keybox-defs.h"

#define compare_filenames strcmp

static KB_NAME kb_names;


/* 
  Register a filename for plain keybox files.  Returns a pointer to be
  used to create a handles etc or NULL to indicate that it has already
  been registered */
void *
keybox_register_file (const char *fname, int secret)
{
  KB_NAME kr;

  for (kr=kb_names; kr; kr = kr->next)
    {
      if ( !compare_filenames (kr->fname, fname) )
        return NULL; /* already registered */
    }

  kr = xtrymalloc (sizeof *kr + strlen (fname));
  if (!kr)
    return NULL;
  strcpy (kr->fname, fname);
  kr->secret = !!secret;
  /* kr->lockhd = NULL;*/
  kr->is_locked = 0;
  kr->did_full_scan = 0;
  /* keep a list of all issued pointers */
  kr->next = kb_names;
  kb_names = kr;
  
  /* create the offset table the first time a function here is used */
/*      if (!kb_offtbl) */
/*        kb_offtbl = new_offset_hash_table (); */

  return kr;
}

int
keybox_is_writable (void *token)
{
  KB_NAME r = token;

  return r? !access (r->fname, W_OK) : 0;
}

    

/* Create a new handle for the resource associated with TOKEN.  SECRET
   is just a cross-check.
   
   The returned handle must be released using keybox_release (). */
KEYBOX_HANDLE
keybox_new (void *token, int secret)
{
  KEYBOX_HANDLE hd;
  KB_NAME resource = token;

  assert (resource && !resource->secret == !secret);
  hd = xtrycalloc (1, sizeof *hd);
  if (hd)
    {
      hd->kb = resource;
      hd->secret = !!secret;
    }
  return hd;
}

void 
keybox_release (KEYBOX_HANDLE hd)
{
  if (!hd)
    return;
  _keybox_release_blob (hd->found.blob);
  xfree (hd->word_match.name);
  xfree (hd->word_match.pattern);
  xfree (hd);
}


const char *
keybox_get_resource_name (KEYBOX_HANDLE hd)
{
  if (!hd || !hd->kb)
    return NULL;
  return hd->kb->fname;
}