Initial Commit as submodule

1 files changed, 219 insertions, 0 deletions

diff --git a/ctl-dispatch/ctl-plugin.c b/ctl-dispatch/ctl-plugin.c
new file mode 100644
index 0000000..f589035
--- /dev/null
+++ b/ctl-dispatch/ctl-plugin.c
@@ -0,0 +1,219 @@
+/*
+ * 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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