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/*
* Copyright 2019 ~ 2021 YuutaW Minecraft, All Rights Reserved.
* Proprietary and confidential.
* Unauthorized copying of any parts of this file, via any medium is strictly prohibited.
* Written by Yuuta Liang <yuuta@yuuta.moe>, April 2021.
*/
#include "plugins.h"
#include "common.h"
#include "plugin_registry.h"
#include <stdlib.h>
#include <stdio.h>
#include <dlfcn.h>
#include <stdbool.h>
#include <string.h>
static const void *plugin_dlsym(int stderr_fd, void *handle, const bool mandatory, const char *name)
{
const void *sym = dlsym(handle, name);
if(sym == NULL)
{
if(mandatory)
{
dprintf(stderr_fd, _("Cannot load %s, aborting: %s.\n"), name, dlerror());
}
else
{
dprintf(stderr_fd, _("Cannot load %s, ignoring: %s.\n"), name, dlerror());
}
return NULL;
}
return sym;
}
int plugin_unload(int stderr_fd, struct plugin *plugin)
{
if(plugin->fc_unload != NULL)
{
struct epg_handle hdl;
plugcall_setup_handle(plugin, &hdl);
int unload_r = plugin->fc_unload(&hdl);
if(unload_r)
{
dprintf(stderr_fd, _("Cannot unload plugin: it returned an error: %d.\n"), unload_r);
return unload_r;
}
}
if(plugin->handle != NULL)
{
dlclose(plugin->handle);
plugin->handle = NULL;
}
return 0;
}
static int plugin_load_v1(int stderr_fd, struct plugin *out)
{
int r = 0;
const void *sym;
sym = plugin_dlsym(stderr_fd, out->handle, true, "epg_name");
if(sym == NULL)
{
r = 64;
goto cleanup;
}
out->name = *(char**)sym;
out->fc_load = plugin_dlsym(stderr_fd, out->handle, false, "epg_load");
out->fc_unload = plugin_dlsym(stderr_fd, out->handle, false, "epg_unload");
out->fc_player_join = plugin_dlsym(stderr_fd, out->handle, false, "epg_player_join");
out->fc_player_leave = plugin_dlsym(stderr_fd, out->handle, false, "epg_player_leave");
out->fc_player_say = plugin_dlsym(stderr_fd, out->handle, false, "epg_player_say");
out->fc_player_die = plugin_dlsym(stderr_fd, out->handle, false, "epg_player_die");
out->fc_player_achievement = plugin_dlsym(stderr_fd, out->handle, false, "epg_player_achievement");
out->fc_player_challenge = plugin_dlsym(stderr_fd, out->handle, false, "epg_player_challenge");
out->fc_player_goal = plugin_dlsym(stderr_fd, out->handle, false, "epg_player_goal");
out->fc_server_stopping = plugin_dlsym(stderr_fd, out->handle, false, "epg_server_stopping");
out->fc_server_starting = plugin_dlsym(stderr_fd, out->handle, false, "epg_server_starting");
out->fc_server_started = plugin_dlsym(stderr_fd, out->handle, false, "epg_server_started");
goto cleanup;
cleanup:
return r;
}
int plugin_load(int stderr_fd, const char *path, const int id, struct plugin *out)
{
int r = 0;
out->id = id;
out->path = path;
out->handle = NULL;
out->name = NULL;
out->version = 0;
out->fc_load = NULL;
out->fc_unload = NULL;
out->fc_player_join = NULL;
out->fc_player_leave = NULL;
out->fc_player_say = NULL;
out->fc_player_die = NULL;
out->fc_player_achievement = NULL;
out->fc_player_challenge = NULL;
out->fc_player_goal = NULL;
out->fc_server_stopping = NULL;
out->fc_server_starting = NULL;
out->fc_server_started = NULL;
void *handle = dlopen(path, RTLD_LAZY);
if(handle == NULL)
{
dprintf(stderr_fd, _("Cannot load %s: %s.\n"), path, dlerror());
r = 1;
goto cleanup;
}
out->handle = handle;
const void *sym = plugin_dlsym(stderr_fd, handle, true, "epg_version");
if(sym == NULL)
{
r = 64;
goto cleanup;
}
out->version = *(uint32_t*)sym;
switch(out->version)
{
case 1:
r = plugin_load_v1(stderr_fd, out);
if(r) goto cleanup;
break;
default:
dprintf(stderr_fd, _("Unsupported plugin %s: Incompatible with version %u.\n"), path, out->version);
break;
}
struct epg_handle hdl;
plugcall_setup_handle(out, &hdl);
r = out->fc_load(&hdl);
if(r)
{
dprintf(stderr_fd, _("Cannot load plugin: it returned an error: %d.\n"), r);
goto cleanup;
}
goto cleanup;
cleanup:
if(r) plugin_unload(stderr_fd, out);
return r;
}
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