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103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/* dynload.c - load cipher extensions
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* Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "util.h"
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#include "cipher.h"
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#include "algorithms.h"
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typedef struct ext_list {
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struct ext_list *next;
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char name[1];
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} *EXTLIST;
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static EXTLIST extensions;
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/* This is actually not used anymore but we keep a list of already
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* set extensions modules here.
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*
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* Here is the ancient comment:
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* Register an extension module. The last registered module will
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* be loaded first. A name may have a list of classes
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* appended; e.g:
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* mymodule.so(1:17,3:20,3:109)
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* means that this module provides digest algorithm 17 and public key
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* algorithms 20 and 109. This is only a hint but if it is there the
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* loader may decide to only load a module which claims to have a
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* requested algorithm.
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*
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* mainpgm is the path to the program which wants to load a module
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* it is only used in some environments.
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*/
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void
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register_cipher_extension( const char *mainpgm, const char *fname )
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{
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EXTLIST r, el, intex;
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char *p, *pe;
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if( *fname != DIRSEP_C ) { /* do tilde expansion etc */
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char *tmp;
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if( strchr(fname, DIRSEP_C) )
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tmp = make_filename(fname, NULL);
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else
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tmp = make_filename(GNUPG_LIBDIR, fname, NULL);
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el = xmalloc_clear( sizeof *el + strlen(tmp) );
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strcpy(el->name, tmp );
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xfree(tmp);
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}
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else {
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el = xmalloc_clear( sizeof *el + strlen(fname) );
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strcpy(el->name, fname );
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}
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/* check whether we have a class hint */
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if( (p=strchr(el->name,'(')) && (pe=strchr(p+1,')')) && !pe[1] )
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*p = *pe = 0;
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/* check that it is not already registered */
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intex = NULL;
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for(r = extensions; r; r = r->next ) {
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if( !compare_filenames(r->name, el->name) ) {
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log_info("extension `%s' already registered\n", el->name );
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xfree(el);
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return;
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}
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}
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/* and register */
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el->next = extensions;
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extensions = el;
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}
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/* Return the module name with index SEQ, return NULL as as indication
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for end of list. */
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const char *
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dynload_enum_module_names (int seq)
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{
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EXTLIST el = extensions;
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for (; el && el->name && seq; el = el->next, seq--)
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;
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return el? el->name:NULL;
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}
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