2 * Copyright 2016 IoT.bzh
3 * Author: José Bollo <jose.bollo@iot.bzh>
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
19 #include <microhttpd.h>
27 #include <openssl/sha.h>
31 #include "afb-req-itf.h"
32 #include "afb-method.h"
34 #include "afb-websock.h"
37 #include "utils-upoll.h"
39 /**************** WebSocket connection upgrade ****************************/
41 static const char websocket_s[] = "websocket";
42 static const char sec_websocket_key_s[] = "Sec-WebSocket-Key";
43 static const char sec_websocket_version_s[] = "Sec-WebSocket-Version";
44 static const char sec_websocket_accept_s[] = "Sec-WebSocket-Accept";
45 static const char sec_websocket_protocol_s[] = "Sec-WebSocket-Protocol";
46 static const char websocket_guid[] = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
48 static void enc64(unsigned char *in, char *out)
50 static const char tob64[] =
51 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
52 "abcdefghijklmnopqrstuvwxyz"
54 out[0] = tob64[in[0] >> 2];
55 out[1] = tob64[((in[0] & 0x03) << 4) | ((in[1] & 0xf0) >> 4)];
56 out[2] = tob64[((in[1] & 0x0f) << 2) | ((in[2] & 0xc0) >> 6)];
57 out[3] = tob64[in[2] & 0x3f];
60 static void make_accept_value(const char *key, char result[29])
62 unsigned char md[SHA_DIGEST_LENGTH+1];
63 size_t len = strlen(key);
64 char *buffer = alloca(len + sizeof websocket_guid - 1);
65 memcpy(buffer, key, len);
66 memcpy(buffer + len, websocket_guid, sizeof websocket_guid - 1);
67 SHA1((const unsigned char *)buffer, (unsigned long)(len + sizeof websocket_guid - 1), md);
68 assert(SHA_DIGEST_LENGTH == 20);
70 enc64(&md[0], &result[0]);
71 enc64(&md[3], &result[4]);
72 enc64(&md[6], &result[8]);
73 enc64(&md[9], &result[12]);
74 enc64(&md[12], &result[16]);
75 enc64(&md[15], &result[20]);
76 enc64(&md[18], &result[24]);
81 static int headerhas(const char *header, const char *needle)
83 static const char sep[] = " \t,";
88 header += strspn(header, sep);
91 len = strcspn(header, sep);
92 if (n == len && 0 == strncasecmp(needle, header, n))
98 int afb_websock_check(struct afb_hreq *hreq, int *later)
100 const char *connection, *upgrade, *key, *version, *protocols;
103 struct MHD_Response *response;
105 /* is an upgrade to websocket ? */
106 upgrade = afb_hreq_get_header(hreq, MHD_HTTP_HEADER_UPGRADE);
107 if (upgrade == NULL || strcasecmp(upgrade, websocket_s))
110 /* is a connection for upgrade ? */
111 connection = afb_hreq_get_header(hreq, MHD_HTTP_HEADER_CONNECTION);
112 if (connection == NULL || !headerhas (connection, MHD_HTTP_HEADER_UPGRADE))
116 if(hreq->method != afb_method_get || strcasecmp(hreq->version, MHD_HTTP_VERSION_1_1))
119 /* has a key and a version ? */
120 key = afb_hreq_get_header(hreq, sec_websocket_key_s);
121 version = afb_hreq_get_header(hreq, sec_websocket_version_s);
122 if (key == NULL || version == NULL)
125 /* is a supported version ? */
126 vernum = atoi(version);
128 response = MHD_create_response_from_buffer(0, NULL, MHD_RESPMEM_PERSISTENT);
129 MHD_add_response_header (response, sec_websocket_version_s, "13");
130 MHD_queue_response (hreq->connection, MHD_HTTP_BAD_REQUEST, response);
131 MHD_destroy_response (response);
136 /* is the protocol supported ? */
137 protocols = afb_hreq_get_header(hreq, sec_websocket_protocol_s);
139 /* send the accept connection */
140 make_accept_value(key, acceptval);
141 response = MHD_create_response_from_buffer(0, NULL, MHD_RESPMEM_PERSISTENT);
142 MHD_add_response_header (response, sec_websocket_accept_s, acceptval);
143 MHD_add_response_header (response, MHD_HTTP_HEADER_CONNECTION, MHD_HTTP_HEADER_UPGRADE);
144 MHD_add_response_header (response, MHD_HTTP_HEADER_UPGRADE, websocket_s);
145 MHD_queue_response (hreq->connection, MHD_HTTP_SWITCHING_PROTOCOLS, response);
146 MHD_destroy_response (response);
152 /**************** WebSocket handling ****************************/
154 static ssize_t aws_writev(struct afb_websock *ws, const struct iovec *iov, int iovcnt);
155 static ssize_t aws_readv(struct afb_websock *ws, const struct iovec *iov, int iovcnt);
156 static void aws_disconnect(struct afb_websock *ws);
157 static void aws_on_close(struct afb_websock *ws, uint16_t code, size_t size);
158 static void aws_on_content(struct afb_websock *ws, int last, size_t size);
159 static void aws_on_readable(struct afb_websock *ws);
161 static struct websock_itf aws_itf = {
162 .writev = (void*)aws_writev,
163 .readv = (void*)aws_readv,
164 .disconnect = (void*)aws_disconnect,
168 .on_close = (void*)aws_on_close,
169 .on_text = (void*)aws_on_content,
170 .on_binary = (void*)aws_on_content,
171 .on_continue = (void*)aws_on_content,
177 struct afb_websock *aws;
178 struct afb_wsreq *next;
179 struct json_object *id;
180 struct json_object *name;
181 struct json_object *token;
182 struct json_object *request;
188 struct MHD_Connection *connection;
191 struct AFB_clientCtx *context;
192 struct json_tokener *tokener;
193 struct afb_wsreq *requests;
196 static struct afb_arg wsreq_get(struct afb_wsreq *wsreq, const char *name);
197 static void wsreq_iterate(struct afb_wsreq *wsreq, int (*iterator)(void *closure, struct afb_arg arg), void *closure);
198 static void wsreq_fail(struct afb_wsreq *wsreq, const char *status, const char *info);
199 static void wsreq_success(struct afb_wsreq *wsreq, struct json_object *obj, const char *info);
200 static int wsreq_session_create(struct afb_wsreq *wsreq);
201 static int wsreq_session_check(struct afb_wsreq *wsreq, int refresh);
202 static void wsreq_session_close(struct afb_wsreq *wsreq);
204 static const struct afb_req_itf wsreq_itf = {
205 .get = (void*)wsreq_get,
206 .iterate = (void*)wsreq_iterate,
207 .fail = (void*)wsreq_fail,
208 .success = (void*)wsreq_success,
209 .session_create = (void*)wsreq_session_create,
210 .session_check = (void*)wsreq_session_check,
211 .session_close = (void*)wsreq_session_close
214 struct afb_websock *afb_websock_create(struct afb_hreq *hreq)
217 struct afb_websock *result;
219 fd = MHD_get_connection_info(hreq->connection,
220 MHD_CONNECTION_INFO_CONNECTION_FD)->connect_fd;
225 result = malloc(sizeof * result);
229 result->connection = hreq->connection;
231 result->context = ctxClientGet(afb_hreq_context(hreq));
232 if (result->context == NULL)
235 result->tokener = json_tokener_new();
236 if (result->tokener == NULL)
239 result->ws = websock_create_v13(&aws_itf, result);
240 if (result->ws == NULL)
243 result->up = upoll_open(result->fd, result);
244 if (result->up == NULL)
247 upoll_on_readable(result->up, (void*)aws_on_readable);
248 upoll_on_hangup(result->up, (void*)aws_disconnect);
251 websock_destroy(result->ws);
253 json_tokener_free(result->tokener);
255 ctxClientPut(result->context);
263 static ssize_t aws_writev(struct afb_websock *ws, const struct iovec *iov, int iovcnt)
267 rc = writev(ws->fd, iov, iovcnt);
268 } while(rc == -1 && errno == EINTR);
272 static ssize_t aws_readv(struct afb_websock *ws, const struct iovec *iov, int iovcnt)
276 rc = readv(ws->fd, iov, iovcnt);
277 } while(rc == -1 && errno == EINTR);
281 static void aws_disconnect(struct afb_websock *ws)
284 websock_destroy(ws->ws);
286 MHD_resume_connection (ws->connection);
287 ctxClientPut(ws->context);
288 json_tokener_free(ws->tokener);
292 static void aws_on_close(struct afb_websock *ws, uint16_t code, size_t size)
297 static void aws_on_readable(struct afb_websock *ws)
299 websock_dispatch(ws->ws);
302 static int aws_handle_json(struct afb_websock *aws, struct json_object *obj)
306 struct json_object *type, *id, *name, *req, *token;
307 struct afb_wsreq *wsreq;
308 const char *api, *verb;
309 size_t lenapi, lenverb;
311 /* protocol inspired by http://www.gir.fr/ocppjs/ocpp_srpc_spec.shtml */
313 /* the object must be an array of 4 or 5 elements */
314 if (!json_object_is_type(obj, json_type_array))
316 count = json_object_array_length(obj);
317 if (count < 4 || count > 5)
320 /* get the 5 elements: type id name request token */
321 type = json_object_array_get_idx(obj, 0);
322 id = json_object_array_get_idx(obj, 1);
323 name = json_object_array_get_idx(obj, 2);
324 req = json_object_array_get_idx(obj, 3);
325 token = json_object_array_get_idx(obj, 4);
327 /* check the types: int string string object string */
328 if (!json_object_is_type(type, json_type_int))
330 if (!json_object_is_type(id, json_type_string))
332 if (!json_object_is_type(name, json_type_string))
334 if (!json_object_is_type(req, json_type_object))
336 if (token != NULL && !json_object_is_type(token, json_type_string))
339 /* the type is only 2 */
340 num = json_object_get_int(type);
344 /* checks the api/verb structure of name */
345 api = json_object_get_string(name);
346 for (lenapi = 0 ; api[lenapi] && api[lenapi] != '/' ; lenapi++);
347 if (!lenapi || !api[lenapi])
349 verb = &api[lenapi+1];
350 for (lenverb = 0 ; verb[lenverb] && verb[lenverb] != '/' ; lenverb++);
351 if (!lenverb || verb[lenverb])
354 /* allocates the request data */
355 wsreq = malloc(sizeof *wsreq);
359 /* fill and record the request */
361 wsreq->id = json_object_get(id);
362 wsreq->name = json_object_get(name);
363 wsreq->token = json_object_get(token);
364 wsreq->request = json_object_get(req);
365 wsreq->next = aws->requests;
366 aws->requests = wsreq;
367 json_object_put(obj);
371 afb_apis_call(r, aws->context, api, lenapi, verb, lenverb);
375 json_object_put(obj);
379 static void aws_on_content(struct afb_websock *ws, int last, size_t size)
383 struct json_object *obj;
385 json_tokener_reset(ws->tokener);
387 rrc = websock_read(ws->ws, buffer,
388 size > sizeof buffer ? sizeof buffer : size);
390 websock_close(ws->ws);
394 obj = json_tokener_parse_ex(ws->tokener, buffer, (int)rrc);
396 if (!aws_handle_json(ws, obj)) {
397 websock_close(ws->ws);
400 } else if (json_tokener_get_error(ws->tokener) != json_tokener_continue) {
401 websock_close(ws->ws);
407 static struct afb_arg wsreq_get(struct afb_wsreq *wsreq, const char *name)
410 struct json_object *value;
412 if (json_object_object_get_ex(wsreq->request, name, &value)) {
414 arg.value = json_object_get_string(value);
415 arg.size = strlen(arg.value);
425 static void wsreq_iterate(struct afb_wsreq *wsreq, int (*iterator)(void *closure, struct afb_arg arg), void *closure)
428 struct json_object_iterator it = json_object_iter_begin(wsreq->request);
429 struct json_object_iterator end = json_object_iter_end(wsreq->request);
433 while(!json_object_iter_equal(&it, &end)) {
434 arg.name = json_object_iter_peek_name(&it);
435 arg.value = json_object_get_string(json_object_iter_peek_value(&it));
436 if (!iterator(closure, arg))
438 json_object_iter_next(&it);
442 static int wsreq_session_create(struct afb_wsreq *wsreq)
444 struct AFB_clientCtx *context = wsreq->aws->context;
445 if (context->created)
447 return wsreq_session_check(wsreq, 1);
450 static int wsreq_session_check(struct afb_wsreq *wsreq, int refresh)
453 struct AFB_clientCtx *context = wsreq->aws->context;
455 if (wsreq->token == NULL)
458 token = json_object_get_string(wsreq->token);
462 if (!ctxTokenCheck (context, token))
466 ctxTokenNew (context);
472 static void wsreq_session_close(struct afb_wsreq *wsreq)
474 struct AFB_clientCtx *context = wsreq->aws->context;
475 ctxClientClose(context);
479 static void wsreq_reply(struct afb_wsreq *wsreq, int retcode, const char *status, const char *info, json_object *resp)
481 json_object *root, *request, *reply;
484 /* builds the answering structure */
485 root = json_object_new_object();
486 json_object_object_add(root, "jtype", json_object_new_string("afb-reply"));
487 request = json_object_new_object();
488 json_object_object_add(root, "request", request);
489 json_object_object_add(request, "status", json_object_new_string(status));
491 json_object_object_add(request, "info", json_object_new_string(info));
493 json_object_object_add(root, "response", resp);
496 reply = json_object_new_array();
497 json_object_array_add(reply, json_object_new_int(retcode));
498 json_object_array_add(reply, wsreq->id);
499 json_object_array_add(reply, root);
500 json_object_array_add(reply, json_object_new_string(wsreq->aws->context->token));
502 /* emits the reply */
503 message = json_object_to_json_string(reply);
504 websock_text(wsreq->aws->ws, message, strlen(message));
505 json_object_put(reply);
507 /* TODO eliminates the wsreq */
510 static void wsreq_fail(struct afb_wsreq *wsreq, const char *status, const char *info)
512 wsreq_reply(wsreq, 4, status, info, NULL);
515 static void wsreq_success(struct afb_wsreq *wsreq, json_object *obj, const char *info)
517 wsreq_reply(wsreq, 3, "success", info, obj);