summaryrefslogtreecommitdiffstats
path: root/ctl-lib/ctl-plugin.c
blob: 4d9414ff5c743a55b8beb4a510888849c182a38a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
/*
 * 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 (AFB_ApiT apiHandle, CtlActionT *action , json_object *callbackJ) {
    const char *plugin=NULL, *function=NULL;
    json_object *argsJ;
    int idx;

    if (!ctlPlugins) {
        AFB_ApiError(apiHandle, "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_ApiError(apiHandle, "PluginGet missing plugin|function|[args] in %s", json_object_get_string(callbackJ));
        goto OnErrorExit;
    }

    for (idx=0; ctlPlugins[idx].uid != NULL; idx++) {
        if (!strcasecmp (ctlPlugins[idx].uid, plugin)) break;
    }

    if (!ctlPlugins[idx].uid) {
        AFB_ApiError(apiHandle, "PluginGetCB no plugin with uid=%s", plugin);
        goto OnErrorExit;
    }

    action->exec.cb.funcname = function;
    action->exec.cb.callback = dlsym(ctlPlugins[idx].dlHandle, function);
    action->exec.cb.plugin= &ctlPlugins[idx];

    if (!action->exec.cb.callback) {
       AFB_ApiError(apiHandle, "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(void* luaState, char *funcname, Lua2cFunctionT callback) {
#ifndef CONTROL_SUPPORT_LUA
    fprintf(stderr, "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 (AFB_ApiT apiHandle, CtlPluginT *ctlPlugin, json_object *pluginJ, void* handle) {
    json_object *lua2csJ = 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 !}",
            "uid", &ctlPlugin->uid,  "info", &ctlPlugin->info, "ldpath", &ldSearchPath, "basename", &basename);
    if (err) {
        AFB_ApiError(apiHandle, "CTL-PLUGIN-LOADONE Plugin missing uid|[info]|[basename]|[ldpath] in:\n-- %s", json_object_get_string(pluginJ));
        goto OnErrorExit;
    }

    // default basename equal uid
    if (!basename) basename=ctlPlugin->uid;

    // 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_ApiError(apiHandle, "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_ApiError(apiHandle, "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_ApiWarning(apiHandle, "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_ApiError(apiHandle, "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_ApiError(apiHandle, "CTL-PLUGIN-LOADONE symbol'CtlPluginMagic' missing or !=  CTL_PLUGIN_MAGIC plugin=%s", pluginpath);
        goto OnErrorExit;
    } else {
        AFB_ApiNotice(apiHandle, "CTL-PLUGIN-LOADONE %s successfully registered", ctlPluginMagic->uid);
    }

    // store dlopen handle to enable onload action at exec time
    ctlPlugin->dlHandle = dlHandle;

#ifndef AFB_BINDING_PREV3
    // Jose hack to make verbosity visible from sharelib with API-V2
    struct afb_binding_data_v2 *afbHidenData = dlsym(dlHandle, "afbBindingV2data");
    if (afbHidenData) *afbHidenData = afbBindingV2data;
#endif

    // 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_ApiError(apiHandle, "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_ApiError(apiHandle, "CTL-PLUGIN-LOADONE %d symbols not found in plugin='%s'", errCount, pluginpath);
            goto OnErrorExit;
        }
    }
#endif
    DispatchPluginInstallCbT ctlPluginOnload = dlsym(dlHandle, "CtlPluginOnload");
    if (ctlPluginOnload) {
        ctlPlugin->api = apiHandle;
        ctlPlugin->context = (*ctlPluginOnload) (ctlPlugin, handle);
    }
    return 0;

OnErrorExit:
    return 1;
}


PUBLIC int PluginConfig(AFB_ApiT apiHandle, 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(apiHandle, &ctlPlugins[idx], pluginJ, section->handle);
        }
    } else {
        ctlPlugins = calloc (2, sizeof(CtlPluginT));
        err += PluginLoadOne(apiHandle, &ctlPlugins[0], pluginsJ, section->handle);
    }

    return err;
}