2 * Copyright (C) 2015 "IoT.bzh"
3 * Author "Fulup Ar Foll"
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 * Handle standard HTTP request
19 * Features/Restriction:
20 - handle ETAG to limit upload to modified/new files [cache default 3600s]
21 - handles redirect to index.htlm when path is a directory [code 301]
22 - only support GET method
23 - does not follow link.
25 References: https://www.gnu.org/software/libmicrohttpd/manual/html_node/index.html#Top
26 http://libmicrohttpd.sourcearchive.com/documentation/0.4.2/microhttpd_8h.html
27 https://gnunet.org/svn/libmicrohttpd/src/examples/fileserver_example_external_select.c
28 https://github.com/json-c/json-c
29 POST https://www.gnu.org/software/libmicrohttpd/manual/html_node/microhttpd_002dpost.html#microhttpd_002dpost
33 #include <microhttpd.h>
36 #include "../include/local-def.h"
38 // let's compute fixed URL length only once
42 // proto missing from GCC
43 char *strcasestr(const char *haystack, const char *needle);
45 static int rqtcount = 0; // dummy request rqtcount to make each message be different
46 static int postcount = 0;
48 // try to open libmagic to handle mime types
49 static AFB_error initLibMagic (AFB_session *session) {
51 /*MAGIC_MIME tells magic to return a mime of the file, but you can specify different things*/
52 if (verbose) printf("Loading mimetype default magic database\n");
54 session->magic = magic_open(MAGIC_MIME_TYPE);
55 if (session->magic == NULL) {
56 fprintf(stderr,"ERROR: unable to initialize magic library\n");
60 // Warning: should not use NULL for DB [libmagic bug wont pass efence check]
61 if (magic_load(session->magic, MAGIC_DB) != 0) {
62 fprintf(stderr,"cannot load magic database - %s\n", magic_error(session->magic));
63 magic_close(session->magic);
70 // Because of POST call multiple time requestApi we need to free POST handle here
71 static void endRequest (void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe) {
72 AFB_HttpPost *posthandle = *con_cls;
74 // if post handle was used let's free everything
76 if (verbose) fprintf (stderr, "End Post Request UID=%d\n", posthandle->uid);
77 free (posthandle->data);
83 // Create check etag value
84 STATIC void computeEtag(char *etag, int maxlen, struct stat *sbuf) {
86 time = sbuf->st_mtim.tv_sec;
87 snprintf(etag, maxlen, "%d", time);
90 STATIC int servFile (struct MHD_Connection *connection, AFB_session *session, const char *url, AFB_staticfile *staticfile) {
91 const char *etagCache, *mimetype;
93 struct MHD_Response *response;
97 if (fstat (staticfile->fd, &sbuf) != 0) {
98 fprintf(stderr, "Fail to stat file: [%s] error:%s\n", staticfile->path, strerror(errno));
102 if (! S_ISREG (sbuf.st_mode)) { // only standard file any other one including symbolic links are refused.
103 close (staticfile->fd); // nothing useful to do with this file
104 fprintf (stderr, "Fail file: [%s] is not a regular file\n", staticfile->path);
105 const char *errorstr = "<html><body>Alsa-Json-Gateway Invalid file type</body></html>";
106 response = MHD_create_response_from_buffer (strlen (errorstr),
107 (void *) errorstr, MHD_RESPMEM_PERSISTENT);
108 MHD_queue_response (connection, MHD_HTTP_INTERNAL_SERVER_ERROR, response);
112 // if url is a directory let's add index.html and redirect client
113 if (S_ISDIR (sbuf.st_mode)) {
114 close (staticfile->fd); // close directory check for Index
116 // No trailing '/'. Let's add one and redirect for relative paths to work
117 if (url [strlen (url) -1] != '/') {
118 response = MHD_create_response_from_buffer(0,"", MHD_RESPMEM_PERSISTENT);
119 strncat(staticfile->path, "/", sizeof (staticfile->path));
120 MHD_add_response_header (response, "Location", staticfile->path);
121 MHD_queue_response (connection, MHD_HTTP_MOVED_PERMANENTLY, response);
122 if (verbose) fprintf (stderr,"Adding trailing '/' [%s]\n",staticfile->path);
126 strncat (staticfile->path, OPA_INDEX, sizeof (staticfile->path));
127 if (-1 == (staticfile->fd = open(staticfile->path, O_RDONLY)) || (fstat (staticfile->fd, &sbuf) != 0)) {
128 fprintf(stderr, "No Index.html in direcory [%s]\n", staticfile->path);
133 // https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching?hl=fr
134 // ftp://ftp.heanet.ie/disk1/www.gnu.org/software/libmicrohttpd/doxygen/dc/d0c/microhttpd_8h.html
136 // Check etag value and load file only when modification date changes
137 etagCache = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_IF_NONE_MATCH);
138 computeEtag(etagValue, sizeof (etagValue), &sbuf);
140 if (etagCache != NULL && strcmp(etagValue, etagCache) == 0) {
141 close(staticfile->fd); // file did not change since last upload
142 if (verbose) fprintf(stderr, "Not Modify: [%s]\n", staticfile->path);
143 response = MHD_create_response_from_buffer(0, "", MHD_RESPMEM_PERSISTENT);
144 MHD_add_response_header(response, MHD_HTTP_HEADER_CACHE_CONTROL, session->cacheTimeout); // default one hour cache
145 MHD_add_response_header(response, MHD_HTTP_HEADER_ETAG, etagValue);
146 MHD_queue_response(connection, MHD_HTTP_NOT_MODIFIED, response);
148 } else { // it's a new file, we need to upload it to client
149 // if we have magic let's try to guest mime type
150 if (session->magic) {
151 mimetype= magic_descriptor(session->magic, staticfile->fd);
152 if (mimetype != NULL) MHD_add_response_header (response, MHD_HTTP_HEADER_CONTENT_TYPE, mimetype);
153 } else mimetype="Unknown";
155 if (verbose) fprintf(stderr, "Serving: [%s] mime=%s\n", staticfile->path, mimetype);
156 response = MHD_create_response_from_fd(sbuf.st_size, staticfile->fd);
157 MHD_add_response_header(response, MHD_HTTP_HEADER_CACHE_CONTROL, session->cacheTimeout); // default one hour cache
158 MHD_add_response_header(response, MHD_HTTP_HEADER_ETAG, etagValue);
159 MHD_queue_response(connection, MHD_HTTP_OK, response);
163 MHD_destroy_response(response);
171 // this function return either Index.htlm or a redirect to /#!route to make angular happy
172 STATIC int redirectHTML5(struct MHD_Connection *connection, AFB_session *session, const char* url) {
176 struct MHD_Response *response;
177 AFB_staticfile staticfile;
179 // Url match /opa/xxxx should redirect to "/opa/#!page" to force index.html reload
180 strncpy(staticfile.path, session->config->rootbase, sizeof (staticfile.path));
181 strncat(staticfile.path, "/#!", sizeof (staticfile.path));
182 strncat(staticfile.path, &url[1], sizeof (staticfile.path));
183 response = MHD_create_response_from_buffer(0,"", MHD_RESPMEM_PERSISTENT);
184 MHD_add_response_header (response, "Location", staticfile.path);
185 MHD_queue_response (connection, MHD_HTTP_MOVED_PERMANENTLY, response);
186 if (verbose) fprintf (stderr,"checkHTML5 redirect to [%s]\n",staticfile.path);
191 // minimal httpd file server for static HTML,JS,CSS,etc...
192 STATIC int requestFile(struct MHD_Connection *connection, AFB_session *session, const char* url) {
195 AFB_staticfile staticfile;
197 // build full path from rootdir + url
200 strncpy(staticfile.path, session->config->rootdir, sizeof (staticfile.path));
201 strncat(staticfile.path, url, sizeof (staticfile.path));
203 // try to open file and get its size
204 if (-1 == (staticfile.fd = open(staticfile.path, O_RDONLY))) {
205 fprintf(stderr, "Fail to open file: [%s] error:%s\n", staticfile.path, strerror(errno));
208 // open file is OK let use it
209 ret = servFile (connection, session, url, &staticfile);
213 // Check and Dispatch HTTP request
214 STATIC int newRequest(void *cls,
215 struct MHD_Connection *connection,
219 const char *upload_data, size_t *upload_data_size, void **con_cls) {
221 AFB_session *session = cls;
222 struct MHD_Response *response;
225 // this is a REST API let's check for plugins
226 if (0 == strncmp(url, session->config->rootapi, apiUrlLen)) {
227 ret = doRestApi(connection, session, &url[apiUrlLen+1], method, upload_data, upload_data_size, con_cls);
231 // From here only accept get request
232 if (0 != strcmp(method, MHD_HTTP_METHOD_GET)) return MHD_NO; /* unexpected method */
234 // If a static file exist serve it now
235 ret = requestFile(connection, session, url);
236 if (ret != FAILED) return ret;
238 // no static was served let's try HTML5 OPA redirect
239 if (0 == strncmp(url, session->config->rootbase, baseUrlLen)) {
240 ret = redirectHTML5(connection, session, &url[baseUrlLen]);
244 // Nothing respond to this request Files, API, Angular Base
245 const char *errorstr = "<html><body>Alsa-Json-Gateway Unknown or Not readable file</body></html>";
246 response = MHD_create_response_from_buffer(strlen(errorstr), (void*)errorstr, MHD_RESPMEM_PERSISTENT);
247 ret = MHD_queue_response(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, response);
251 STATIC int newClient(void *cls, const struct sockaddr * addr, socklen_t addrlen) {
252 // check if client is coming from an acceptable IP
253 return (MHD_YES); // MHD_NO
257 PUBLIC AFB_error httpdStart(AFB_session *session) {
259 // compute fixed URL length at startup time
260 apiUrlLen = strlen (session->config->rootapi);
261 baseUrlLen= strlen (session->config->rootbase);
263 // open libmagic cache
264 // initLibMagic (session);
268 printf("AFB:notice Waiting port=%d rootdir=%s\n", session->config->httpdPort, session->config->rootdir);
269 printf("AFB:notice Browser URL= http://localhost:%d\n", session->config->httpdPort);
272 session->httpd = (void*) MHD_start_daemon(
273 MHD_USE_SELECT_INTERNALLY | MHD_USE_DEBUG, // use request and not threads
274 session->config->httpdPort, // port
275 &newClient, NULL, // Tcp Accept call back + extra attribute
276 &newRequest, session, // Http Request Call back + extra attribute
277 MHD_OPTION_NOTIFY_COMPLETED, &endRequest, NULL,
278 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 15, MHD_OPTION_END); // 15s + options-end
279 // TBD: MHD_OPTION_SOCK_ADDR
281 if (session->httpd == NULL) {
282 printf("Error: httpStart invalid httpd port: %d", session->config->httpdPort);
289 PUBLIC AFB_error httpdLoop(AFB_session *session) {
290 static int count = 0;
292 if (verbose) fprintf(stderr, "AFB:notice entering httpd waiting loop\n");
293 if (session->foreground) {
296 fprintf(stderr, "AFB:notice Use Ctrl-C to quit\n");
302 if (verbose) fprintf(stderr, "AFB:notice httpd alive [%d]\n", count++);
306 // should never return from here
310 PUBLIC int httpdStatus(AFB_session *session) {
311 return (MHD_run(session->httpd));
314 PUBLIC void httpdStop(AFB_session *session) {
315 MHD_stop_daemon(session->httpd);