summaryrefslogtreecommitdiffstats
path: root/src/afb-hsrv.c
blob: 6bc8ffa3fec779f45c5b75bbe61e13303d419688 (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
/*
 * Copyright (C) 2016, 2017 "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 <stdint.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <poll.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>

#include <microhttpd.h>
#include <systemd/sd-event.h>

#include "afb-method.h"
#include "afb-context.h"
#include "afb-hreq.h"
#include "afb-hsrv.h"
#include <afb/afb-req-itf.h>
#include "verbose.h"
#include "locale-root.h"

#include "afb-common.h"



#define JSON_CONTENT  "application/json"
#define FORM_CONTENT  MHD_HTTP_POST_ENCODING_MULTIPART_FORMDATA


struct hsrv_handler {
	struct hsrv_handler *next;
	const char *prefix;
	size_t length;
	int (*handler) (struct afb_hreq *, void *);
	void *data;
	int priority;
};

struct hsrv_alias {
	struct locale_root *root;
	int relax;
};

struct afb_hsrv {
	unsigned refcount;
	struct hsrv_handler *handlers;
	struct MHD_Daemon *httpd;
	sd_event_source *evsrc;
	int in_run;
	char *cache_to;
};

static int global_reqids = 0;

static void reply_error(struct MHD_Connection *connection, unsigned int status)
{
	struct MHD_Response *response = MHD_create_response_from_buffer(0, NULL, MHD_RESPMEM_PERSISTENT);
	MHD_queue_response(connection, status, response);
	MHD_destroy_response(response);
}

static int postproc(void *cls,
                    enum MHD_ValueKind kind,
                    const char *key,
                    const char *filename,
                    const char *content_type,
                    const char *transfer_encoding,
                    const char *data,
		    uint64_t off,
		    size_t size)
{
	struct afb_hreq *hreq = cls;
	if (filename != NULL)
		return afb_hreq_post_add_file(hreq, key, filename, data, size);
	else
		return afb_hreq_post_add(hreq, key, data, size);
}

static int access_handler(
		void *cls,
		struct MHD_Connection *connection,
		const char *url,
		const char *methodstr,
		const char *version,
		const char *upload_data,
		size_t *upload_data_size,
		void **recordreq)
{
	int rc;
	struct afb_hreq *hreq;
	enum afb_method method;
	struct afb_hsrv *hsrv;
	struct hsrv_handler *iter;
	const char *type;

	hsrv = cls;
	hreq = *recordreq;
	if (hreq == NULL) {
		/* get the method */
		method = get_method(methodstr);
		method &= afb_method_get | afb_method_post;
		if (method == afb_method_none) {
			reply_error(connection, MHD_HTTP_BAD_REQUEST);
			return MHD_YES;
		}

		/* create the request */
		hreq = calloc(1, sizeof *hreq);
		if (hreq == NULL) {
			reply_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR);
			return MHD_YES;
		}

		/* init the request */
		hreq->refcount = 1;
		hreq->hsrv = hsrv;
		hreq->cacheTimeout = hsrv->cache_to;
		hreq->reqid = ++global_reqids;
		hreq->scanned = 0;
		hreq->suspended = 0;
		hreq->replied = 0;
		hreq->connection = connection;
		hreq->method = method;
		hreq->version = version;
		hreq->lang = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_ACCEPT_LANGUAGE);
		hreq->tail = hreq->url = url;
		hreq->lentail = hreq->lenurl = strlen(url);
		*recordreq = hreq;

		/* init the post processing */
		if (method == afb_method_post) {
			type = afb_hreq_get_header(hreq, MHD_HTTP_HEADER_CONTENT_TYPE);
			if (type == NULL) {
				/* an empty post, let's process it as a get */
				hreq->method = afb_method_get;
			} else if (strcasestr(type, FORM_CONTENT) != NULL) {
				hreq->postform = MHD_create_post_processor (connection, 65500, postproc, hreq);
				if (hreq->postform == NULL)
					afb_hreq_reply_error(hreq, MHD_HTTP_INTERNAL_SERVER_ERROR);
				return MHD_YES;
			} else if (strcasestr(type, JSON_CONTENT) != NULL) {
				return MHD_YES;
                        } else {
				afb_hreq_reply_error(hreq, MHD_HTTP_UNSUPPORTED_MEDIA_TYPE);
				return MHD_YES;
			}
		}
	}

	/* process further data */
	if (*upload_data_size) {
		if (hreq->postform != NULL) {
			if (!MHD_post_process (hreq->postform, upload_data, *upload_data_size)) {
				afb_hreq_reply_error(hreq, MHD_HTTP_INTERNAL_SERVER_ERROR);
				return MHD_YES;
			}
		} else {
			if (!afb_hreq_post_add(hreq, "", upload_data, *upload_data_size)) {
				afb_hreq_reply_error(hreq, MHD_HTTP_INTERNAL_SERVER_ERROR);
				return MHD_YES;
			}
		}
		*upload_data_size = 0;
		return MHD_YES;
	}

	/* flush the data */
	if (hreq->postform != NULL) {
		rc = MHD_destroy_post_processor(hreq->postform);
		hreq->postform = NULL;
		if (rc == MHD_NO) {
			afb_hreq_reply_error(hreq, MHD_HTTP_BAD_REQUEST);
			return MHD_YES;
		}
	}

	if (hreq->scanned != 0) {
		if (hreq->replied == 0 && hreq->suspended == 0) {
			MHD_suspend_connection (connection);
			hreq->suspended = 1;
		}
		return MHD_YES;
	}

	/* search an handler for the request */
	hreq->scanned = 1;
	iter = hsrv->handlers;
	while (iter) {
		if (afb_hreq_unprefix(hreq, iter->prefix, iter->length)) {
			if (iter->handler(hreq, iter->data)) {
				if (hreq->replied == 0 && hreq->suspended == 0) {
					MHD_suspend_connection (connection);
					hreq->suspended = 1;
				}
				return MHD_YES;
			}
			hreq->tail = hreq->url;
			hreq->lentail = hreq->lenurl;
		}
		iter = iter->next;
	}

	/* no handler */
	afb_hreq_reply_error(hreq, MHD_HTTP_NOT_FOUND);
	return MHD_YES;
}

/* Because of POST call multiple time requestApi we need to free POST handle here */
static void end_handler(void *cls, struct MHD_Connection *connection, void **recordreq,
			enum MHD_RequestTerminationCode toe)
{
	struct afb_hreq *hreq;

	hreq = *recordreq;
	if (hreq->upgrade)
		MHD_suspend_connection (connection);
	afb_hreq_unref(hreq);
}

void run_micro_httpd(struct afb_hsrv *hsrv)
{
	if (hsrv->in_run != 0)
		hsrv->in_run = 2;
	else {
		sd_event_source_set_io_events(hsrv->evsrc, 0);
		do {
			hsrv->in_run = 1;
			MHD_run(hsrv->httpd);
		} while(hsrv->in_run == 2);
		hsrv->in_run = 0;
		sd_event_source_set_io_events(hsrv->evsrc, EPOLLIN);
	}
}

static int io_event_callback(sd_event_source *src, int fd, uint32_t revents, void *hsrv)
{
	run_micro_httpd(hsrv);
	return 0;
}

static int new_client_handler(void *cls, const struct sockaddr *addr, socklen_t addrlen)
{
	return MHD_YES;
}

static struct hsrv_handler *new_handler(
		struct hsrv_handler *head,
		const char *prefix,
		int (*handler) (struct afb_hreq *, void *),
		void *data,
		int priority)
{
	struct hsrv_handler *link, *iter, *previous;
	size_t length;

	/* get the length of the prefix without its leading / */
	length = strlen(prefix);
	while (length && prefix[length - 1] == '/')
		length--;

	/* allocates the new link */
	link = malloc(sizeof *link);
	if (link == NULL)
		return NULL;

	/* initialize it */
	link->prefix = prefix;
	link->length = length;
	link->handler = handler;
	link->data = data;
	link->priority = priority;

	/* adds it */
	previous = NULL;
	iter = head;
	while (iter && (priority < iter->priority || (priority == iter->priority && length <= iter->length))) {
		previous = iter;
		iter = iter->next;
	}
	link->next = iter;
	if (previous == NULL)
		return link;
	previous->next = link;
	return head;
}

static int handle_alias(struct afb_hreq *hreq, void *data)
{
	int rc;
	struct hsrv_alias *da = data;
	struct locale_search *search;

	if (hreq->method != afb_method_get) {
		if (da->relax)
			return 0;
		afb_hreq_reply_error(hreq, MHD_HTTP_METHOD_NOT_ALLOWED);
		return 1;
	}

	search = locale_root_search(da->root, hreq->lang, 0);
	rc = afb_hreq_reply_locale_file_if_exist(hreq, search, &hreq->tail[1]);
	locale_search_unref(search);
	if (rc == 0) {
		if (da->relax)
			return 0;
		afb_hreq_reply_error(hreq, MHD_HTTP_NOT_FOUND);
	}
	return 1;
}

int afb_hsrv_add_handler(
		struct afb_hsrv *hsrv,
		const char *prefix,
		int (*handler) (struct afb_hreq *, void *),
		void *data,
		int priority)
{
	struct hsrv_handler *head;

	head = new_handler(hsrv->handlers, prefix, handler, data, priority);
	if (head == NULL)
		return 0;
	hsrv->handlers = head;
	return 1;
}

int afb_hsrv_add_alias_root(struct afb_hsrv *hsrv, const char *prefix, struct locale_root *root, int priority, int relax)
{
	struct hsrv_alias *da;

	da = malloc(sizeof *da);
	if (da != NULL) {
		da->root = root;
		da->relax = relax;
		if (afb_hsrv_add_handler(hsrv, prefix, handle_alias, da, priority)) {
			locale_root_addref(root);
			return 1;
		}
		free(da);
	}
	return 0;
}

int afb_hsrv_add_alias(struct afb_hsrv *hsrv, const char *prefix, int dirfd, const char *alias, int priority, int relax)
{
	struct locale_root *root;
	int rc;

	root = locale_root_create_at(dirfd, alias);
	if (root == NULL) {
		ERROR("can't connect to directory %s: %m", alias);
		rc = 0;
	} else {
		rc = afb_hsrv_add_alias_root(hsrv, prefix, root, priority, relax);
		locale_root_unref(root);
	}
	return rc;
}

int afb_hsrv_set_cache_timeout(struct afb_hsrv *hsrv, int duration)
{
	int rc;
	char *dur;

	rc = asprintf(&dur, "%d", duration);
	if (rc < 0)
		return 0;

	free(hsrv->cache_to);
	hsrv->cache_to = dur;
	return 1;
}

int afb_hsrv_start(struct afb_hsrv *hsrv, uint16_t port, unsigned int connection_timeout)
{
	sd_event_source *evsrc;
	int rc;
	struct MHD_Daemon *httpd;
	const union MHD_DaemonInfo *info;

	httpd = MHD_start_daemon(
		MHD_USE_EPOLL_LINUX_ONLY | MHD_USE_TCP_FASTOPEN | MHD_USE_DEBUG | MHD_USE_SUSPEND_RESUME,
		port,				/* port */
		new_client_handler, NULL,	/* Tcp Accept call back + extra attribute */
		access_handler, hsrv,	/* Http Request Call back + extra attribute */
		MHD_OPTION_NOTIFY_COMPLETED, end_handler, hsrv,
		MHD_OPTION_CONNECTION_TIMEOUT, connection_timeout,
		MHD_OPTION_END);	/* options-end */

	if (httpd == NULL) {
		ERROR("httpStart invalid httpd port: %d", (int)port);
		return 0;
	}

	info = MHD_get_daemon_info(httpd, MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY);
	if (info == NULL) {
		MHD_stop_daemon(httpd);
		ERROR("httpStart no pollfd");
		return 0;
	}

	rc = sd_event_add_io(afb_common_get_event_loop(), &evsrc, info->listen_fd, EPOLLIN, io_event_callback, hsrv);
	if (rc < 0) {
		MHD_stop_daemon(httpd);
		errno = -rc;
		ERROR("connection to events for httpd failed");
		return 0;
	}

	hsrv->httpd = httpd;
	hsrv->evsrc = evsrc;
	return 1;
}

void afb_hsrv_stop(struct afb_hsrv *hsrv)
{
	if (hsrv->evsrc != NULL) {
		sd_event_source_unref(hsrv->evsrc);
		hsrv->evsrc = NULL;
	}
	if (hsrv->httpd != NULL)
		MHD_stop_daemon(hsrv->httpd);
	hsrv->httpd = NULL;
}

struct afb_hsrv *afb_hsrv_create()
{
	struct afb_hsrv *result = calloc(1, sizeof(struct afb_hsrv));
	if (result != NULL)
		result->refcount = 1;
	return result;
}

void afb_hsrv_put(struct afb_hsrv *hsrv)
{
	assert(hsrv->refcount != 0);
	if (!--hsrv->refcount) {
		afb_hsrv_stop(hsrv);
		free(hsrv);
	}
}