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/*
* Copyright (C) 2016 "IoT.bzh"
* Author Fulup Ar Foll <fulup@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, something express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Reference:
* Json load using json_unpack https://jansson.readthedocs.io/en/2.9/apiref.html#parsing-and-validating-values
*/
#define _GNU_SOURCE
#include <string.h>
#include <dlfcn.h>
#include "ctl-config.h"
static CtlPluginT *ctlPlugins=NULL;
PUBLIC int PluginGetCB (CtlActionT *action , json_object *callbackJ) {
const char *plugin=NULL, *function=NULL;
json_object *argsJ;
int idx;
if (!ctlPlugins) {
AFB_ERROR ("PluginGetCB plugin section missing cannot call '%s'", json_object_get_string(callbackJ));
goto OnErrorExit;
}
int err = wrap_json_unpack(callbackJ, "{ss,ss,s?s,s?o!}", "plugin", &plugin, "function", &function, "args", &argsJ);
if (err) {
AFB_ERROR("PluginGet missing plugin|function|[args] in %s", json_object_get_string(callbackJ));
goto OnErrorExit;
}
for (idx=0; ctlPlugins[idx].label != NULL; idx++) {
if (!strcasecmp (ctlPlugins[idx].label, plugin)) break;
}
if (!ctlPlugins[idx].label) {
AFB_ERROR ("PluginGetCB no plugin with label=%s", plugin);
goto OnErrorExit;
}
action->actionCB = dlsym(ctlPlugins[idx].dlHandle, function);
action->source.context = ctlPlugins[idx].context;
if (!action->actionCB) {
AFB_ERROR ("PluginGetCB no plugin=%s no function=%s", plugin, function);
goto OnErrorExit;
}
return 0;
OnErrorExit:
return 1;
}
// Wrapper to Lua2c plugin command add context and delegate to LuaWrapper
STATIC int DispatchOneL2c(lua_State* luaState, char *funcname, Lua2cFunctionT callback) {
#ifndef CONTROL_SUPPORT_LUA
AFB_ERROR("CTL-ONE-L2C: LUA support not selected (cf:CONTROL_SUPPORT_LUA) in config.cmake");
return 1;
#else
int err=Lua2cWrapper(luaState, funcname, callback);
return err;
#endif
}
STATIC int PluginLoadOne (CtlPluginT *ctlPlugin, json_object *pluginJ, void* handle) {
json_object *lua2csJ = NULL, *actionsJ = NULL;
const char*ldSearchPath = NULL, *basename = NULL;
void *dlHandle;
// plugin initialises at 1st load further init actions should be place into onload section
if (!pluginJ) return 0;
int err = wrap_json_unpack(pluginJ, "{ss,s?s,s?s,s?s,ss,s?o,s?o!}",
"label", &ctlPlugin->label, "version", &ctlPlugin->version, "info", &ctlPlugin->info, "ldpath", &ldSearchPath, "basename", &basename, "lua2c", &lua2csJ, "actions", &actionsJ);
if (err) {
AFB_ERROR("CTL-PLUGIN-LOADONE Plugin missing label|basename|version|[info]|[ldpath]|[lua2c]|[actions] in:\n-- %s", json_object_get_string(pluginJ));
goto OnErrorExit;
}
// if search path not in Json config file, then try default
if (!ldSearchPath) ldSearchPath = CONTROL_PLUGIN_PATH;
// search for default policy config file
json_object *pluginPathJ = ScanForConfig(ldSearchPath, CTL_SCAN_RECURSIVE, basename, CTL_PLUGIN_EXT);
if (!pluginPathJ || json_object_array_length(pluginPathJ) == 0) {
AFB_ERROR("CTL-PLUGIN-LOADONE Missing plugin=%s*%s (config ldpath?) search=\n-- %s", basename, CTL_PLUGIN_EXT, ldSearchPath);
goto OnErrorExit;
}
char *filename;
char*fullpath;
err = wrap_json_unpack(json_object_array_get_idx(pluginPathJ, 0), "{s:s, s:s !}", "fullpath", &fullpath, "filename", &filename);
if (err) {
AFB_ERROR("CTL-PLUGIN-LOADONE HOOPs invalid plugin file path=\n-- %s", json_object_get_string(pluginPathJ));
goto OnErrorExit;
}
if (json_object_array_length(pluginPathJ) > 1) {
AFB_WARNING("CTL-PLUGIN-LOADONE plugin multiple instances in searchpath will use %s/%s", fullpath, filename);
}
char pluginpath[CONTROL_MAXPATH_LEN];
strncpy(pluginpath, fullpath, sizeof (pluginpath));
strncat(pluginpath, "/", sizeof (pluginpath));
strncat(pluginpath, filename, sizeof (pluginpath));
dlHandle = dlopen(pluginpath, RTLD_NOW);
if (!dlHandle) {
AFB_ERROR("CTL-PLUGIN-LOADONE Fail to load pluginpath=%s err= %s", pluginpath, dlerror());
goto OnErrorExit;
}
CtlPluginMagicT *ctlPluginMagic = (CtlPluginMagicT*) dlsym(dlHandle, "CtlPluginMagic");
if (!ctlPluginMagic || ctlPluginMagic->magic != CTL_PLUGIN_MAGIC) {
AFB_ERROR("CTL-PLUGIN-LOADONE symbol'CtlPluginMagic' missing or != CTL_PLUGIN_MAGIC plugin=%s", pluginpath);
goto OnErrorExit;
} else {
AFB_NOTICE("CTL-PLUGIN-LOADONE %s successfully registered", ctlPluginMagic->label);
}
// store dlopen handle to enable onload action at exec time
ctlPlugin->dlHandle = dlHandle;
// Jose hack to make verbosity visible from sharelib
struct afb_binding_data_v2 *afbHidenData = dlsym(dlHandle, "afbBindingV2data");
if (afbHidenData) *afbHidenData = afbBindingV2data;
// Push lua2cWrapper @ into plugin
Lua2cWrapperT *lua2cInPlug = dlsym(dlHandle, "Lua2cWrap");
#ifndef CONTROL_SUPPORT_LUA
if (lua2cInPlug) *lua2cInPlug = NULL;
#else
// Lua2cWrapper is part of binder and not expose to dynamic link
if (lua2csJ && lua2cInPlug) {
*lua2cInPlug = DispatchOneL2c;
int Lua2cAddOne(luaL_Reg *l2cFunc, const char* l2cName, int index) {
char funcName[CONTROL_MAXPATH_LEN];
strncpy(funcName, "lua2c_", sizeof (funcName));
strncat(funcName, l2cName, sizeof (funcName));
Lua2cFunctionT l2cFunction = (Lua2cFunctionT) dlsym(dlHandle, funcName);
if (!l2cFunction) {
AFB_ERROR("CTL-PLUGIN-LOADONE symbol'%s' missing err=%s", funcName, dlerror());
return 1;
}
l2cFunc[index].func = (void*) l2cFunction;
l2cFunc[index].name = strdup(l2cName);
return 0;
}
int errCount = 0;
luaL_Reg *l2cFunc = NULL;
// look on l2c command and push them to LUA
if (json_object_get_type(lua2csJ) == json_type_array) {
int length = json_object_array_length(lua2csJ);
l2cFunc = calloc(length + 1, sizeof (luaL_Reg));
for (int count = 0; count < length; count++) {
int err;
const char *l2cName = json_object_get_string(json_object_array_get_idx(lua2csJ, count));
err = Lua2cAddOne(l2cFunc, l2cName, count);
if (err) errCount++;
}
} else {
l2cFunc = calloc(2, sizeof (luaL_Reg));
const char *l2cName = json_object_get_string(lua2csJ);
errCount = Lua2cAddOne(l2cFunc, l2cName, 0);
}
if (errCount) {
AFB_ERROR("CTL-PLUGIN-LOADONE %d symbols not found in plugin='%s'", errCount, pluginpath);
goto OnErrorExit;
}
}
#endif
DispatchPluginInstallCbT ctlPluginOnload = dlsym(dlHandle, "CtlPluginOnload");
if (ctlPluginOnload) {
ctlPlugin->context = (*ctlPluginOnload) (ctlPlugin, handle);
}
return 0;
OnErrorExit:
return 1;
}
PUBLIC int PluginConfig(CtlSectionT *section, json_object *pluginsJ) {
int err=0;
if (json_object_get_type(pluginsJ) == json_type_array) {
int length = json_object_array_length(pluginsJ);
ctlPlugins = calloc (length+1, sizeof(CtlPluginT));
for (int idx=0; idx < length; idx++) {
json_object *pluginJ = json_object_array_get_idx(pluginsJ, idx);
err += PluginLoadOne(&ctlPlugins[idx], pluginJ, section->handle);
}
} else {
ctlPlugins = calloc (2, sizeof(CtlPluginT));
err += PluginLoadOne(&ctlPlugins[0], pluginsJ, section->handle);
}
return err;
}
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