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/*******************************************************************************
* Copyright (c) 2009, 2010 Philippe Proulx, École Polytechnique de Montréal
* Michael Sills-Lavoie, École Polytechnique de Montréal
* and others. All rights reserved.
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v1.0 which accompany this distribution.
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
* You may elect to redistribute this code under either of these licenses.
*
* Contributors:
* Philippe Proulx - initial plugins system
* Michael Sills-Lavoie - deterministic plugins loading order
* Michael Sills-Lavoie - plugin's shared functions
*******************************************************************************/
/*
* Plugins system.
*/
#if defined(__GNUC__) && !defined(_GNU_SOURCE)
# define _GNU_SOURCE
#endif
#include <tcf/config.h>
#if ENABLE_Plugins
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <dlfcn.h>
#include <errno.h>
#include <tcf/framework/trace.h>
#include <tcf/framework/myalloc.h>
#include <tcf/framework/plugins.h>
#define _QUOTEME(x) #x
#define QUOTE(x) _QUOTEME(x)
#if defined(WIN32)
#define PLUGINS_DEF_EXT "dll" /* Default plugins' extension */
#else
#define PLUGINS_DEF_EXT "so" /* Default plugins' extension */
#endif
typedef void (*InitFunc)(Protocol *, TCFBroadcastGroup *, void *);
const char *plugins_path = QUOTE(PATH_Plugins);
static void ** plugins_handles = NULL;
static size_t plugins_count = 0;
static struct function_entry {
char * name;
void * function;
} * function_entries = NULL;
static size_t function_entry_count = 0;
static inline int plugins_ext_is(const char * ext, const char * filename) {
const char * real_ext = strrchr(filename, '.');
return real_ext != NULL && !strcmp(real_ext + 1, ext);
}
static int plugins_filter(const struct dirent * dirent) {
if (!strcmp(dirent->d_name, ".") || !strcmp(dirent->d_name, ".."))
return 0;
if (!plugins_ext_is(PLUGINS_DEF_EXT, dirent->d_name) || dirent->d_type == DT_DIR)
return 0;
return 1;
}
#if defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 10))
static int plugins_ralphasort(const void * a, const void * b) {
#else
static int plugins_ralphasort(const struct dirent ** a, const struct dirent ** b) {
#endif
return -alphasort(a, b);
}
int plugins_load(Protocol * proto, TCFBroadcastGroup * bcg) {
struct dirent ** files;
int file_count = -1;
int ret = 0;
file_count = scandir(plugins_path, &files, plugins_filter, plugins_ralphasort);
if (file_count < 0) {
trace(LOG_PLUGIN, "plugins error: failed opening plugins directory \"%s\"", plugins_path);
return -1;
}
while (file_count--) {
char * cur_plugin_path = NULL;
if (asprintf(&cur_plugin_path, "%s/%s", plugins_path, files[file_count]->d_name) == -1) {
trace(LOG_PLUGIN, "plugins error: `asprintf' failed for plugin \"%s\"", files[file_count]->d_name);
ret = -1;
goto delete_cur_entry;
}
if (plugin_init(cur_plugin_path, proto, bcg)) {
trace(LOG_PLUGIN, "plugins error: unable to start plugin \"%s\"", cur_plugin_path);
ret = -1;
/* Continue to load the rest of plugins */
}
/* cur_plugin_path and files were allocated by asprintf() and scandir(),
* and they should be released by free(), don't call loc_free() here. */
free(cur_plugin_path);
delete_cur_entry:
free(files[file_count]);
}
free(files);
return ret;
}
int plugin_init(const char * name, Protocol * proto, TCFBroadcastGroup * bcg) {
void * handle;
char * error;
InitFunc init;
/* Plugin loading: */
trace(LOG_PLUGIN, "loading plugin \"%s\"", name);
handle = dlopen(name, RTLD_LAZY);
if (!handle) {
trace(LOG_PLUGIN, "plugins error: \"%s\"", dlerror());
return -1;
}
/* Plugin initialization: */
init = (InitFunc)dlsym(handle, "tcf_init_plugin");
if ((error = dlerror()) != NULL) {
trace(LOG_PLUGIN, "plugins error: \"%s\"", error);
return -1;
}
trace(LOG_PLUGIN, "initializing plugin \"%s\"", name);
init(proto, bcg, NULL);
/* Handles table update: */
plugins_handles = (void **) loc_realloc(plugins_handles,
++plugins_count * sizeof(void *));
plugins_handles[plugins_count - 1] = handle;
return 0;
}
int plugin_add_function(const char * name, void * function) {
size_t i;
if (!name || !function) return -EINVAL;
/* Check if the function name already exists */
for (i = 0; i < function_entry_count; ++i)
if (!strcmp(name, function_entries[i].name))
return -EEXIST;
function_entries = (struct function_entry *) loc_realloc(function_entries,
++function_entry_count * sizeof(struct function_entry));
function_entries[function_entry_count-1].function = function;
function_entries[function_entry_count-1].name = loc_strdup(name);
return 0;
}
void * plugin_get_function(const char * name) {
size_t i;
if (!name) return NULL;
for (i = 0; i < function_entry_count; ++i)
if (!strcmp(name, function_entries[i].name))
return function_entries[i].function;
return NULL;
}
int plugins_destroy(void) {
size_t i;
for (i = 0; i < plugins_count; ++i) {
if (dlclose(plugins_handles[i])) {
trace(LOG_PLUGIN, "plugins error: \"%s\"", dlerror());
}
}
loc_free(plugins_handles);
for (i = 0; i < function_entry_count; ++i)
loc_free(function_entries[i].name);
loc_free(function_entries);
return 0;
}
#endif /* if ENABLE_Plugins */
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