summaryrefslogtreecommitdiffstats
path: root/plugins/afm-main-plugin/utils-jbus.c
blob: 7e65723a2b2142690277fbbb0dfc94156dbe84d4 (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
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
/*
 Copyright 2015 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.
*/
#define _GNU_SOURCE

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

#include <json.h>
#include <dbus/dbus.h>

#include "utils-jbus.h"

struct jreq;
struct jservice;
struct jbus;

/* structure for handled requests */
struct jreq {
	DBusConnection *connection;
	DBusMessage *request;
};

/* structure for recorded services */
struct jservice {
	struct jservice *next;
	char *method;
	void (*oncall_s)(struct jreq *, const char *);
	void (*oncall_j)(struct jreq *, struct json_object *);
};

/* structure for signal handlers */
struct jsignal {
	struct jsignal *next;
	char *name;
	void (*onsignal_s)(const char *);
	void (*onsignal_j)(struct json_object *);
};

/* structure for recording asynchronous requests */
struct jrespw {
	struct jrespw *next;
	dbus_uint32_t serial;
	void *data;
	void (*onresp_s)(int, const char*, void *);
	void (*onresp_j)(int, struct json_object*, void *);
};

/* structure for synchronous requests */
struct respsync {
	int replied;
	char *value;
};

/* structure for handling either client or server jbus on dbus */
struct jbus {
	int refcount;
	struct jservice *services;
	DBusConnection *connection;
	struct jsignal *signals;
	struct jrespw *waiters;
	char *path;
	char *name;
};

/*********************** STATIC COMMON METHODS *****************/

static inline void free_jreq(struct jreq *jreq)
{
	dbus_message_unref(jreq->request);
	dbus_connection_unref(jreq->connection);
	free(jreq);
}

static inline int reply_out_of_memory(struct jreq *jreq)
{
	static const char out_of_memory[] = "out of memory";
	jbus_reply_error_s(jreq, out_of_memory);
	errno = ENOMEM;
	return -1;
}

static inline int reply_invalid_request(struct jreq *jreq)
{
	static const char invalid_request[] = "invalid request";
	jbus_reply_error_s(jreq, invalid_request);
	return DBUS_HANDLER_RESULT_HANDLED;
}

static int matchitf(struct jbus *jbus, DBusMessage *message)
{
	const char *itf = dbus_message_get_interface(message);
	return itf != NULL && !strcmp(itf, jbus->name);
}

static int add_service(
		struct jbus *jbus,
		const char *method,
		void (*oncall_s)(struct jreq*, const char*),
		void (*oncall_j)(struct jreq*, struct json_object*)
)
{
	struct jservice *srv;

	/* allocation */
	srv = malloc(sizeof * srv);
	if (srv == NULL) {
		errno = ENOMEM;
		goto error;
	}
	srv->method = strdup(method);
	if (!srv->method) {
		errno = ENOMEM;
		goto error2;
	}

	/* record the service */
	srv->oncall_s = oncall_s;
	srv->oncall_j = oncall_j;
	srv->next = jbus->services;
	jbus->services = srv;

	return 0;

error2:
	free(srv);
error:
	return -1;
}

static int add_signal(
	struct jbus *jbus,
	const char *name,
	void (*onsignal_s)(const char*),
	void (*onsignal_j)(struct json_object*)
)
{
	char *rule;
	struct jsignal *sig;

	/* record the signal */
	if (jbus->signals == NULL) {
		if (0 >= asprintf(&rule, "type='signal',sender='%s',interface='%s',path='%s'", jbus->name, jbus->name, jbus->path))
			return -1;
		dbus_bus_add_match(jbus->connection, rule, NULL);
		free(rule);
	}

	/* allocation */
	sig = malloc(sizeof * sig);
	if (sig == NULL)
		goto error;
	sig->name = strdup(name);
	if (!sig->name)
		goto error2;

	/* record the signal */
	sig->onsignal_s = onsignal_s;
	sig->onsignal_j = onsignal_j;
	sig->next = jbus->signals;
	jbus->signals = sig;

	return 0;

error2:
	free(sig);
error:
	errno = ENOMEM;
	return -1;
}

static int call(
	struct jbus *jbus,
	const char *method,
	const char *query,
	void (*onresp_s)(int status, const char *response, void *data),
	void (*onresp_j)(int status, struct json_object *response, void *data),
	void *data
)
{
	DBusMessage *msg;
	struct jrespw *resp;

	resp = malloc(sizeof * resp);
	if (resp == NULL) {
		errno = ENOMEM;
		goto error;
	}

	msg = dbus_message_new_method_call(jbus->name, jbus->path, jbus->name, method);
	if (msg == NULL) {
		errno = ENOMEM;
		goto error2;
	}

	if (!dbus_message_append_args(msg, DBUS_TYPE_STRING, &query, DBUS_TYPE_INVALID)) {
		errno = ENOMEM;
		goto error3;
	}

	if (!dbus_connection_send(jbus->connection, msg, &resp->serial)) {
		goto error3;
	}

	dbus_message_unref(msg);
	resp->data = data;
	resp->onresp_s = onresp_s;
	resp->onresp_j = onresp_j;
	resp->next = jbus->waiters;
	jbus->waiters = resp;
	return 0;

error3:
	dbus_message_unref(msg);
error2:
	free(resp);
error:
	return -1;
}

static void sync_of_replies(int status, const char *value, void *data)
{
	struct respsync *s = data;
	s->value = status ? NULL : strdup(value ? value : "");
	s->replied = 1;
}

static DBusHandlerResult incoming_resp(DBusConnection *connection, DBusMessage *message, struct jbus *jbus, int iserror)
{
	int status;
	const char *str;
	struct jrespw *jrw, **prv;
	struct json_object *reply;
	dbus_uint32_t serial;

	/* search for the waiter */
	serial = dbus_message_get_reply_serial(message);
	prv = &jbus->waiters;
	while ((jrw = *prv) != NULL && jrw->serial != serial)
		prv = &jrw->next;
	if (jrw == NULL)
		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	*prv = jrw->next;

	/* retrieve the string value */
	if (!dbus_message_get_args(message, NULL, DBUS_TYPE_STRING, &str, DBUS_TYPE_INVALID)) {
		status = -1;
		str = NULL;
		reply = NULL;
	}

	/* treat it */
	if (jrw->onresp_s)
		jrw->onresp_s(iserror ? -1 : status, str, jrw->data);
	else {
		reply = json_tokener_parse(str);
		status = reply ? 0 : -1;
		jrw->onresp_j(iserror ? -1 : status, reply, jrw->data);
	}

	free(jrw);
	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult incoming_call(DBusConnection *connection, DBusMessage *message, struct jbus *jbus)
{
	struct jservice *srv;
	struct jreq *jreq;
	const char *str;
	const char *method;
	struct json_object *query;

	/* search for the service */
	if (!matchitf(jbus, message))
		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	method = dbus_message_get_member(message);
	if (method == NULL)
		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	srv = jbus->services;
	while(srv != NULL && strcmp(method, srv->method))
		srv = srv->next;
	if (srv == NULL)
		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;

	/* handle the message */
	jreq = malloc(sizeof * jreq);
	if (jreq == NULL)
		return DBUS_HANDLER_RESULT_NEED_MEMORY;
	jreq->request = dbus_message_ref(message);
	jreq->connection = dbus_connection_ref(jbus->connection);
	
	/* retrieve the string value */
	if (!dbus_message_get_args(message, NULL, DBUS_TYPE_STRING, &str, DBUS_TYPE_INVALID))
		return reply_invalid_request(jreq);
	if (srv->oncall_s) {
		/* handling strings only */
		srv->oncall_s(jreq, str);
	}
	else {
		/* handling json only */
		query = json_tokener_parse(str);
		if (query == NULL)
			return reply_invalid_request(jreq);
		srv->oncall_j(jreq, query);
	}
	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult incoming_signal(DBusConnection *connection, DBusMessage *message, struct jbus *jbus)
{
	struct jsignal *sig;
	const char *str;
	const char *name;
	struct json_object *obj;

	/* search for the service */
	if (!matchitf(jbus, message))
		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	name = dbus_message_get_member(message);
	if (name == NULL)
		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	sig = jbus->signals;
	while(sig != NULL && strcmp(name, sig->name))
		sig = sig->next;
	if (sig == NULL)
		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;

	/* retrieve the string value */
	if (dbus_message_get_args(message, NULL, DBUS_TYPE_STRING, &str, DBUS_TYPE_INVALID)) {
		if (sig->onsignal_s) {
			/* handling strings only */
			sig->onsignal_s(str);
		}
		else {
			/* handling json only */
			obj = json_tokener_parse(str);
			if (obj != NULL)
				sig->onsignal_j(obj);
		}
	}
	return DBUS_HANDLER_RESULT_HANDLED;
}

static DBusHandlerResult incoming(DBusConnection *connection, DBusMessage *message, void *data)
{
	switch(dbus_message_get_type(message)) {
	case DBUS_MESSAGE_TYPE_METHOD_CALL:
		return incoming_call(connection, message, (struct jbus*)data);
	case DBUS_MESSAGE_TYPE_METHOD_RETURN:
		return incoming_resp(connection, message, (struct jbus*)data, 0);
	case DBUS_MESSAGE_TYPE_ERROR:
		return incoming_resp(connection, message, (struct jbus*)data, 1);
	case DBUS_MESSAGE_TYPE_SIGNAL:
		return incoming_signal(connection, message, (struct jbus*)data);
	}
	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}

/************************** MAIN FUNCTIONS *****************************************/

struct jbus *create_jbus(int session, const char *path)
{
	struct jbus *jbus;
	char *name;

	/* create the context and connect */
	jbus = calloc(1, sizeof * jbus);
	if (jbus == NULL) {
		errno = ENOMEM;
		goto error;
	}
	jbus->refcount = 1;
	jbus->path = strdup(path);
	jbus->name = NULL;
	if (jbus->path == NULL) {
		errno = ENOMEM;
		goto error2;
	}
	while(*path == '/') path++;
	jbus->name = name = strdup(path);
	if (name == NULL) {
		errno = ENOMEM;
		goto error2;
	}
	while(*name) {
		if (*name == '/')
			*name = '.';
		name++;
	}
	name--;
	while (name >= jbus->name && *name == '.')
		*name-- = 0;
	if (!*jbus->name) {
		errno = EINVAL;
		goto error2;
	}

	/* connect */
	jbus->connection = dbus_bus_get(session ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, NULL);
	if (jbus->connection == NULL) {
		goto error2;
	}
	if (!dbus_connection_add_filter(jbus->connection, incoming, jbus, NULL)) {
		goto error2;
	}

	return jbus;

error2:
	jbus_unref(jbus);
error:
	return NULL;
}

void jbus_addref(struct jbus *jbus)
{
	jbus->refcount++;
}

void jbus_unref(struct jbus *jbus)
{
	struct jservice *srv;
	if (!--jbus->refcount) {
		dbus_connection_unref(jbus->connection);
		while((srv = jbus->services) != NULL) {
			jbus->services = srv->next;
			free(srv->method);
			free(srv);
		}
		free(jbus->name);
		free(jbus->path);
		free(jbus);
	}
}

int jbus_reply_error_s(struct jreq *jreq, const char *error)
{
	int rc = -1;
	DBusMessage *message;

	message = dbus_message_new_error(jreq->request, DBUS_ERROR_FAILED, error);
	if (message == NULL)
		errno = ENOMEM;
	else {
		if (dbus_connection_send(jreq->connection, message, NULL))
			rc = 0;
		dbus_message_unref(message);
	}
	free_jreq(jreq);
	return rc;
}

int jbus_reply_error_j(struct jreq *jreq, struct json_object *reply)
{
	const char *str = json_object_to_json_string(reply);
	return str ? jbus_reply_error_s(jreq, str) : reply_out_of_memory(jreq);
}

int jbus_reply_s(struct jreq *jreq, const char *reply)
{
	int rc = -1;
	DBusMessage *message;

	message = dbus_message_new_method_return(jreq->request);
	if (message == NULL)
		return reply_out_of_memory(jreq);

	if (!dbus_message_append_args(message, DBUS_TYPE_STRING, &reply, DBUS_TYPE_INVALID)) {
		dbus_message_unref(message);
		return reply_out_of_memory(jreq);
	}

	if (dbus_connection_send(jreq->connection, message, NULL))
		rc = 0;
	dbus_message_unref(message);
	free_jreq(jreq);
	return rc;
}

int jbus_reply_j(struct jreq *jreq, struct json_object *reply)
{
	const char *str = json_object_to_json_string(reply);
	return str ? jbus_reply_s(jreq, str) : reply_out_of_memory(jreq);
}

int jbus_send_signal_s(struct jbus *jbus, const char *name, const char *content)
{
	int rc = -1;
	DBusMessage *message;

	message = dbus_message_new_signal(jbus->path, jbus->name, name);
	if (message == NULL)
		goto error;

	if (!dbus_message_append_args(message, DBUS_TYPE_STRING, &content, DBUS_TYPE_INVALID)) {
		dbus_message_unref(message);
		goto error;
	}

	if (dbus_connection_send(jbus->connection, message, NULL))
		rc = 0;
	dbus_message_unref(message);
	return rc;

error:
	errno = ENOMEM;
	return -1;
}

int jbus_send_signal_j(struct jbus *jbus, const char *name, struct json_object *content)
{
	const char *str = json_object_to_json_string(content);
	if (str == NULL) {
		errno = ENOMEM;
		return -1;
	}
	return jbus_send_signal_s(jbus, name, str);
}

int jbus_add_service_s(struct jbus *jbus, const char *method, void (*oncall)(struct jreq *, const char *))
{
	return add_service(jbus, method, oncall, NULL);
}

int jbus_add_service_j(struct jbus *jbus, const char *method, void (*oncall)(struct jreq *, struct json_object *))
{
	return add_service(jbus, method, NULL, oncall);
}

int jbus_start_serving(struct jbus *jbus)
{
	int status = dbus_bus_request_name(jbus->connection, jbus->name, DBUS_NAME_FLAG_DO_NOT_QUEUE, NULL);
	switch (status) {
	case DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER:
	case DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER:
		return 0;
	case DBUS_REQUEST_NAME_REPLY_EXISTS:
	case DBUS_REQUEST_NAME_REPLY_IN_QUEUE:
	default:
		errno = EADDRINUSE;
		return -1;
	}
}

int jbus_read_write_dispatch(struct jbus *jbus, int toms)
{
	if (dbus_connection_read_write_dispatch(jbus->connection, toms));
		return 0;
	errno = EPIPE;
	return -1;
}

int jbus_call_ss(struct jbus *jbus, const char *method, const char *query, void (*onresp)(int, const char*, void*), void *data)
{
	return call(jbus, method, query, onresp, NULL, data);
}

int jbus_call_sj(struct jbus *jbus, const char *method, const char *query, void (*onresp)(int, struct json_object*, void*), void *data)
{
	return call(jbus, method, query, NULL, onresp, data);
}

int jbus_call_js(struct jbus *jbus, const char *method, struct json_object *query, void (*onresp)(int, const char*, void*), void *data)
{
	const char *str = json_object_to_json_string(query);
	if (str == NULL) {
		errno = ENOMEM;
		return -1;
	}
	return call(jbus, method, str, onresp, NULL, data);
}

int jbus_call_jj(struct jbus *jbus, const char *method, struct json_object *query, void (*onresp)(int, struct json_object*, void*), void *data)
{
	const char *str = json_object_to_json_string(query);
	if (str == NULL) {
		errno = ENOMEM;
		return -1;
	}
	return call(jbus, method, str, NULL, onresp, data);
}

char *jbus_call_ss_sync(struct jbus *jbus, const char *method, const char *query)
{
	struct respsync synchro;
	synchro.value = NULL;
	synchro.replied = jbus_call_ss(jbus, method, query, sync_of_replies, &synchro);
	while (!synchro.replied && !jbus_read_write_dispatch(jbus, -1));
	return synchro.value;
}

struct json_object *jbus_call_sj_sync(struct jbus *jbus, const char *method, const char *query)
{
	const char *str = jbus_call_ss_sync(jbus, method, query);
	return str ? json_tokener_parse(str) : NULL;
}


char *jbus_call_js_sync(struct jbus *jbus, const char *method, struct json_object *query)
{
	const char *str = json_object_to_json_string(query);
	if (str == NULL) {
		errno = ENOMEM;
		return NULL;
	}
	return jbus_call_ss_sync(jbus, method, str);
}

struct json_object *jbus_call_jj_sync(struct jbus *jbus, const char *method, struct json_object *query)
{
	const char *str = json_object_to_json_string(query);
	if (str == NULL) {
		errno = ENOMEM;
		return NULL;
	}
	return jbus_call_sj_sync(jbus, method, str);
}

int jbus_on_signal_s(struct jbus *jbus, const char *name, void (*onsig)(const char *))
{
	return add_signal(jbus, name, onsig, NULL);
}

int jbus_on_signal_j(struct jbus *jbus, const char *name, void (*onsig)(struct json_object *))
{
	return add_signal(jbus, name, NULL, onsig);
}

/************************** FEW LITTLE TESTS *****************************************/

#ifdef SERVER
#include <stdio.h>
#include <unistd.h>
struct jbus *jbus;
void ping(struct jreq *jreq, struct json_object *request)
{
printf("ping(%s) -> %s\n",json_object_to_json_string(request),json_object_to_json_string(request));
	jbus_reply_j(jreq, request);
	json_object_put(request);	
}
void incr(struct jreq *jreq, struct json_object *request)
{
	static int counter = 0;
	struct json_object *res = json_object_new_int(++counter);
printf("incr(%s) -> %s\n",json_object_to_json_string(request),json_object_to_json_string(res));
	jbus_reply_j(jreq, res);
jbus_send_signal_j(jbus, "incremented", res);
	json_object_put(res);
	json_object_put(request);
}
int main()
{
	int s1, s2, s3;
	jbus = create_jbus(1, "/bzh/iot/jdbus");
	s1 = jbus_add_service_j(jbus, "ping", ping);
	s2 = jbus_add_service_j(jbus, "incr", incr);
	s3 = jbus_start_serving(jbus);
	printf("started %d %d %d\n", s1, s2, s3);
	while (!jbus_read_write_dispatch (jbus, -1))
		;
}
#endif
#ifdef CLIENT
#include <stdio.h>
#include <unistd.h>
struct jbus *jbus;
void onresp(int status, struct json_object *response, void *data)
{
	printf("resp: %d, %s, %s\n",status,(char*)data,json_object_to_json_string(response));
	json_object_put(response);
}
void signaled(const char *data)
{
	printf("signaled with {%s}\n", data);
}
int main()
{
	int i = 10;
	jbus = create_jbus(1, "/bzh/iot/jdbus");
	jbus_on_signal_s(jbus, "incremented", signaled);
	while(i--) {
		jbus_call_sj(jbus, "ping", "{\"toto\":[1,2,3,4,true,\"toto\"]}", onresp, "ping");
		jbus_call_sj(jbus, "incr", "{\"doit\":\"for-me\"}", onresp, "incr");
		jbus_read_write_dispatch (jbus, 1);
	}
	printf("[[[%s]]]\n", jbus_call_ss_sync(jbus, "ping", "\"formidable!\""));
	while (!jbus_read_write_dispatch (jbus, -1))
		;
}
#endif