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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999-2025 Free Software Foundation, Inc.
This 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 3 of the License, or (at your option) any later version.
This 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 this library. If not, see
<http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef HAVE_LIBLTDL
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sieve-priv.h>
#include <ltdl.h>
#include <mailutils/cctype.h>
typedef int (*sieve_module_init_t) (mu_sieve_machine_t mach);
static int _add_load_dir (void *, void *);
static int
sieve_init_load_path (void)
{
static int inited = 0;
if (!inited)
{
if (lt_dlinit ())
return 1;
if (mu_list_foreach (mu_sieve_library_path_prefix, _add_load_dir, NULL))
return 1;
#ifdef MU_SIEVE_MODDIR
if (_add_load_dir (MU_SIEVE_MODDIR, NULL))
return 1;
#endif
if (mu_list_foreach (mu_sieve_library_path, _add_load_dir, NULL))
return 1;
inited = 1;
}
return 0;
}
static lt_dlhandle
load_module (mu_sieve_machine_t mach, const char *name)
{
lt_dlhandle handle;
if (sieve_init_load_path ())
return NULL;
handle = lt_dlopenext (name);
if (handle)
{
sieve_module_init_t init;
init = (sieve_module_init_t) lt_dlsym (handle, "init");
if (init)
{
init (mach);
return handle;
}
else
{
lt_dlclose (handle);
handle = NULL;
mu_sieve_error (mach, _("can't load %s: required symbol \"init\" not found"), name);
}
}
else
{
mu_sieve_error (mach, "%s: %s", name, lt_dlerror ());
lt_dlexit ();
}
return handle;
}
static void
fix_module_name (char *name)
{
for (; *name; name++)
{
if (mu_isalnum (*name) || *name == '.' || *name == ',')
continue;
*name = '-';
}
}
void *
mu_sieve_load_ext (mu_sieve_machine_t mach, const char *name)
{
lt_dlhandle handle;
char *modname;
modname = strdup (name);
if (!modname)
return NULL;
fix_module_name (modname);
handle = load_module (mach, modname);
free (modname);
return handle;
}
void
mu_sieve_unload_ext (void *data)
{
if (data)
lt_dlclose ((lt_dlhandle)data);
}
static int
_add_load_dir (void *item, void *unused)
{
if (lt_dladdsearchdir (item))
{
mu_error (_("can't add dynamic library search directory: %s"),
lt_dlerror ());
return MU_ERR_FAILURE;
}
return 0;
}
int
mu_i_sv_load_add_dir (mu_sieve_machine_t mach, const char *name)
{
if (sieve_init_load_path ())
return 1;
mu_sieve_machine_add_destructor (mach, (mu_sieve_destructor_t) lt_dlexit,
NULL);
return lt_dladdsearchdir (name);
}
#else
#include <sieve-priv.h>
void *
mu_sieve_load_ext (mu_sieve_machine_t mach, const char *name)
{
errno = ENOSYS;
return NULL;
}
void
mu_sieve_unload_ext (void *data)
{
}
int
mu_i_sv_load_add_dir (mu_sieve_machine_t mach, const char *name)
{
errno = ENOSYS;
return 1;
}
#endif /* HAVE_LIBLTDL */
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