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/*
* Copyright (C) 2016 "IoT.bzh"
* Author: José Bollo <jose.bollo@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, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <stdarg.h>
/*****************************************************************************
* This files is the main file to include for writing plugins dedicated to
*
* AFB-DAEMON
*
* Functions of plugins of afb-daemon are accessible by authorized clients
* through the apis module of afb-daemon.
*
* A plugin is a shared library. This shared library must have at least one
* exported symbol for being registered in afb-daemon.
* For the current version of afb-daemon, the function exported MUST be named
*
* pluginAfbV1Register
*/
/*
* Some function of the library are exported to afb-daemon.
*/
#include <afb/afb-req-itf.h>
/*
* Definition of the versions of the plugin.
* The definition uses hashes.
*/
enum AFB_plugin_version
{
AFB_PLUGIN_VERSION_1 = 123456789 /* version 1 */
};
/*
* Enum for Session/Token/Assurance middleware.
* This enumeration is valid for plugins of type 1
*/
enum AFB_session_v1
{
AFB_SESSION_NONE = 0, /* nothing required */
AFB_SESSION_CREATE = 1, /* Obsolete */
AFB_SESSION_CLOSE = 2, /* After token authentification, closes the session at end */
AFB_SESSION_RENEW = 4, /* After token authentification, refreshes the token at end */
AFB_SESSION_CHECK = 8, /* Requires token authentification */
AFB_SESSION_LOA_GE = 16, /* check that the LOA is greater or equal to the given value */
AFB_SESSION_LOA_LE = 32, /* check that the LOA is lesser or equal to the given value */
AFB_SESSION_LOA_EQ = 48, /* check that the LOA is equal to the given value */
AFB_SESSION_LOA_SHIFT = 6, /* shift for LOA */
AFB_SESSION_LOA_MASK = 7, /* mask for LOA */
AFB_SESSION_LOA_0 = 0, /* value for LOA of 0 */
AFB_SESSION_LOA_1 = 64, /* value for LOA of 1 */
AFB_SESSION_LOA_2 = 128, /* value for LOA of 2 */
AFB_SESSION_LOA_3 = 192, /* value for LOA of 3 */
AFB_SESSION_LOA_4 = 256, /* value for LOA of 4 */
AFB_SESSION_LOA_LE_0 = AFB_SESSION_LOA_LE | AFB_SESSION_LOA_0, /* check LOA <= 0 */
AFB_SESSION_LOA_LE_1 = AFB_SESSION_LOA_LE | AFB_SESSION_LOA_1, /* check LOA <= 1 */
AFB_SESSION_LOA_LE_2 = AFB_SESSION_LOA_LE | AFB_SESSION_LOA_2, /* check LOA <= 2 */
AFB_SESSION_LOA_LE_3 = AFB_SESSION_LOA_LE | AFB_SESSION_LOA_3, /* check LOA <= 3 */
AFB_SESSION_LOA_GE_0 = AFB_SESSION_LOA_GE | AFB_SESSION_LOA_0, /* check LOA >= 0 */
AFB_SESSION_LOA_GE_1 = AFB_SESSION_LOA_GE | AFB_SESSION_LOA_1, /* check LOA >= 1 */
AFB_SESSION_LOA_GE_2 = AFB_SESSION_LOA_GE | AFB_SESSION_LOA_2, /* check LOA >= 2 */
AFB_SESSION_LOA_GE_3 = AFB_SESSION_LOA_GE | AFB_SESSION_LOA_3, /* check LOA >= 3 */
AFB_SESSION_LOA_EQ_0 = AFB_SESSION_LOA_EQ | AFB_SESSION_LOA_0, /* check LOA == 0 */
AFB_SESSION_LOA_EQ_1 = AFB_SESSION_LOA_EQ | AFB_SESSION_LOA_1, /* check LOA == 1 */
AFB_SESSION_LOA_EQ_2 = AFB_SESSION_LOA_EQ | AFB_SESSION_LOA_2, /* check LOA == 2 */
AFB_SESSION_LOA_EQ_3 = AFB_SESSION_LOA_EQ | AFB_SESSION_LOA_3 /* check LOA == 3 */
};
/*
* Description of one verb of the API provided by the plugin
* This enumeration is valid for plugins of type 1
*/
struct AFB_verb_desc_v1
{
const char *name; /* name of the verb */
enum AFB_session_v1 session; /* authorisation and session requirements of the verb */
void (*callback)(struct afb_req req); /* callback function implementing the verb */
const char *info; /* textual description of the verb */
};
/*
* Description of the plugins of type 1
*/
struct AFB_plugin_desc_v1
{
const char *info; /* textual information about the plugin */
const char *prefix; /* required prefix name for the plugin */
const struct AFB_verb_desc_v1 *verbs; /* array of descriptions of verbs terminated by a NULL name */
};
/*
* Description of a plugin
*/
struct AFB_plugin
{
enum AFB_plugin_version type; /* type of the plugin */
union {
struct AFB_plugin_desc_v1 v1; /* description of the plugin of type 1 */
};
};
/*
* config mode
*/
enum AFB_Mode {
AFB_MODE_LOCAL = 0, /* run locally */
AFB_MODE_REMOTE, /* run remotely */
AFB_MODE_GLOBAL /* run either remotely or locally (DONT USE! reserved for future) */
};
/* declaration of features of libsystemd */
struct sd_event;
struct sd_bus;
/*
* Definition of the facilities provided by the daemon.
*/
struct afb_daemon_itf {
void (*event_broadcast)(void *closure, const char *name, struct json_object *object); /* broadcasts evant 'name' with 'object' */
struct sd_event *(*get_event_loop)(void *closure); /* gets the common systemd's event loop */
struct sd_bus *(*get_user_bus)(void *closure); /* gets the common systemd's user d-bus */
struct sd_bus *(*get_system_bus)(void *closure); /* gets the common systemd's system d-bus */
void (*vverbose)(void*closure, int level, const char *file, int line, const char *fmt, va_list args);
};
/*
* Structure for accessing daemon.
* See also: afb_daemon_get_event_sender, afb_daemon_get_event_loop, afb_daemon_get_user_bus, afb_daemon_get_system_bus
*/
struct afb_daemon {
const struct afb_daemon_itf *itf; /* the interfacing functions */
void *closure; /* the closure when calling these functions */
};
/*
* Interface between the daemon and the plugin.
*/
struct AFB_interface
{
struct afb_daemon daemon; /* access to the daemon facilies */
int verbosity; /* level of verbosity */
enum AFB_Mode mode; /* run mode (local or remote) */
};
/*
* Function for registering the plugin
*/
extern const struct AFB_plugin *pluginAfbV1Register (const struct AFB_interface *interface);
/*
* Retrieves the common systemd's event loop of AFB
* 'daemon' MUST be the daemon given in interface when activating the plugin.
*/
static inline struct sd_event *afb_daemon_get_event_loop(struct afb_daemon daemon)
{
return daemon.itf->get_event_loop(daemon.closure);
}
/*
* Retrieves the common systemd's user/session d-bus of AFB
* 'daemon' MUST be the daemon given in interface when activating the plugin.
*/
static inline struct sd_bus *afb_daemon_get_user_bus(struct afb_daemon daemon)
{
return daemon.itf->get_user_bus(daemon.closure);
}
/*
* Retrieves the common systemd's system d-bus of AFB
* 'daemon' MUST be the daemon given in interface when activating the plugin.
*/
static inline struct sd_bus *afb_daemon_get_system_bus(struct afb_daemon daemon)
{
return daemon.itf->get_system_bus(daemon.closure);
}
/*
* Broadcasts widely the event of 'name' with the data 'object'.
* 'object' can be NULL.
* 'daemon' MUST be the daemon given in interface when activating the plugin.
*
* For conveniency, the function calls 'json_object_put' for 'object'.
* Thus, in the case where 'object' should remain available after
* the function returns, the function 'json_object_get' shall be used.
*/
static inline void afb_daemon_broadcast_event(struct afb_daemon daemon, const char *name, struct json_object *object)
{
return daemon.itf->event_broadcast(daemon.closure, name, object);
}
/*
* Send a message described by 'fmt' and following parameters
* to the journal for the verbosity 'level'.
* 'file' and 'line' are indicators of position of the code in source files.
* 'daemon' MUST be the daemon given in interface when activating the plugin.
*/
static inline void afb_daemon_verbose(struct afb_daemon daemon, int level, const char *file, int line, const char *fmt, ...) __attribute__((format(printf, 5, 6)));
static inline void afb_daemon_verbose(struct afb_daemon daemon, int level, const char *file, int line, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
return daemon.itf->vverbose(daemon.closure, level, file, line, fmt, args);
va_end(args);
}
/*
* Macros for logging messages
*/
#if !defined(NO_PLUGIN_VERBOSE_MACRO)
# if !defined(NO_PLUGIN_FILE_LINE_INDICATION)
# define ERROR(itf,...) do{if(itf->verbosity>=0)afb_daemon_verbose(itf->daemon,3,__FILE__,__LINE__,__VA_ARGS__);}while(0)
# define WARNING(itf,...) do{if(itf->verbosity>=1)afb_daemon_verbose(itf->daemon,4,__FILE__,__LINE__,__VA_ARGS__);}while(0)
# define NOTICE(itf,...) do{if(itf->verbosity>=1)afb_daemon_verbose(itf->daemon,5,__FILE__,__LINE__,__VA_ARGS__);}while(0)
# define INFO(itf,...) do{if(itf->verbosity>=2)afb_daemon_verbose(itf->daemon,6,__FILE__,__LINE__,__VA_ARGS__);}while(0)
# define DEBUG(itf,...) do{if(itf->verbosity>=3)afb_daemon_verbose(itf->daemon,7,__FILE__,__LINE__,__VA_ARGS__);}while(0)
# else
# define ERROR(itf,...) do{if(itf->verbosity>=0)afb_daemon_verbose(itf->daemon,3,NULL,0,__VA_ARGS__);}while(0)
# define WARNING(itf,...) do{if(itf->verbosity>=1)afb_daemon_verbose(itf->daemon,4,NULL,0,__VA_ARGS__);}while(0)
# define NOTICE(itf,...) do{if(itf->verbosity>=1)afb_daemon_verbose(itf->daemon,5,NULL,0,__VA_ARGS__);}while(0)
# define INFO(itf,...) do{if(itf->verbosity>=2)afb_daemon_verbose(itf->daemon,6,NULL,0,__VA_ARGS__);}while(0)
# define DEBUG(itf,...) do{if(itf->verbosity>=3)afb_daemon_verbose(itf->daemon,7,NULL,0,__VA_ARGS__);}while(0)
# endif
#endif
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