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>
37 #include "../include/local-def.h"
39 // let's compute fixed URL length only once
44 // proto missing from GCC
45 char *strcasestr(const char *haystack, const char *needle);
47 static int rqtcount = 0; // dummy request rqtcount to make each message be different
48 static int postcount = 0;
50 // try to open libmagic to handle mime types
51 static AFB_error initLibMagic (AFB_session *session) {
53 /*MAGIC_MIME tells magic to return a mime of the file, but you can specify different things*/
54 if (verbose) printf("Loading mimetype default magic database\n");
56 session->magic = magic_open(MAGIC_MIME_TYPE);
57 if (session->magic == NULL) {
58 fprintf(stderr,"ERROR: unable to initialize magic library\n");
62 // Warning: should not use NULL for DB [libmagic bug wont pass efence check]
63 if (magic_load(session->magic, MAGIC_DB) != 0) {
64 fprintf(stderr,"cannot load magic database - %s\n", magic_error(session->magic));
65 magic_close(session->magic);
72 // Because of POST call multiple time requestApi we need to free POST handle here
73 static void endRequest (void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe) {
74 AFB_PostHandle *posthandle = *con_cls;
76 // if post handle was used let's free everything
77 if (posthandle != NULL) endPostRequest (posthandle);
81 // Create check etag value
82 STATIC void computeEtag(char *etag, int maxlen, struct stat *sbuf) {
84 time = sbuf->st_mtim.tv_sec;
85 snprintf(etag, maxlen, "%d", time);
88 STATIC int servFile (struct MHD_Connection *connection, AFB_session *session, const char *url, AFB_staticfile *staticfile) {
89 const char *etagCache, *mimetype;
91 struct MHD_Response *response;
95 if (fstat (staticfile->fd, &sbuf) != 0) {
96 fprintf(stderr, "Fail to stat file: [%s] error:%s\n", staticfile->path, strerror(errno));
100 // if url is a directory let's add index.html and redirect client
101 if (S_ISDIR (sbuf.st_mode)) {
102 close (staticfile->fd); // close directory check for Index
104 // No trailing '/'. Let's add one and redirect for relative paths to work
105 if (url [strlen (url) -1] != '/') {
106 response = MHD_create_response_from_buffer(0,"", MHD_RESPMEM_PERSISTENT);
107 strncpy(staticfile->path, url, sizeof (staticfile->path));
108 strncat(staticfile->path, "/", sizeof (staticfile->path));
109 MHD_add_response_header (response, "Location", staticfile->path);
110 MHD_queue_response (connection, MHD_HTTP_MOVED_PERMANENTLY, response);
111 if (verbose) fprintf (stderr,"Adding trailing '/' [%s]\n",staticfile->path);
115 strncat (staticfile->path, OPA_INDEX, sizeof (staticfile->path));
116 if (-1 == (staticfile->fd = open(staticfile->path, O_RDONLY)) || (fstat (staticfile->fd, &sbuf) != 0)) {
117 fprintf(stderr, "No Index.html in direcory [%s]\n", staticfile->path);
120 } else if (! S_ISREG (sbuf.st_mode)) { // only standard file any other one including symbolic links are refused.
121 close (staticfile->fd); // nothing useful to do with this file
122 fprintf (stderr, "Fail file: [%s] is not a regular file\n", staticfile->path);
123 const char *errorstr = "<html><body>Application Framework Binder Invalid file type</body></html>";
124 response = MHD_create_response_from_buffer (strlen (errorstr),
125 (void *) errorstr, MHD_RESPMEM_PERSISTENT);
126 MHD_queue_response (connection, MHD_HTTP_INTERNAL_SERVER_ERROR, response);
130 // https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching?hl=fr
131 // ftp://ftp.heanet.ie/disk1/www.gnu.org/software/libmicrohttpd/doxygen/dc/d0c/microhttpd_8h.html
133 // Check etag value and load file only when modification date changes
134 etagCache = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_IF_NONE_MATCH);
135 computeEtag(etagValue, sizeof (etagValue), &sbuf);
137 if (etagCache != NULL && strcmp(etagValue, etagCache) == 0) {
138 close(staticfile->fd); // file did not change since last upload
139 if (verbose) fprintf(stderr, "Not Modify: [%s]\n", staticfile->path);
140 response = MHD_create_response_from_buffer(0, "", MHD_RESPMEM_PERSISTENT);
141 MHD_add_response_header(response, MHD_HTTP_HEADER_CACHE_CONTROL, session->cacheTimeout); // default one hour cache
142 MHD_add_response_header(response, MHD_HTTP_HEADER_ETAG, etagValue);
143 MHD_queue_response(connection, MHD_HTTP_NOT_MODIFIED, response);
145 } else { // it's a new file, we need to upload it to client
146 // if we have magic let's try to guest mime type
147 if (session->magic) {
148 mimetype= magic_descriptor(session->magic, staticfile->fd);
149 if (mimetype != NULL) MHD_add_response_header (response, MHD_HTTP_HEADER_CONTENT_TYPE, mimetype);
150 } else mimetype="application/unknown";
152 if (verbose) fprintf(stderr, "Serving: [%s] mime=%s\n", staticfile->path, mimetype);
153 response = MHD_create_response_from_fd(sbuf.st_size, staticfile->fd);
154 MHD_add_response_header(response, MHD_HTTP_HEADER_CACHE_CONTROL, session->cacheTimeout); // default one hour cache
155 MHD_add_response_header(response, MHD_HTTP_HEADER_ETAG, etagValue);
156 MHD_queue_response(connection, MHD_HTTP_OK, response);
160 MHD_destroy_response(response);
168 // this function return either Index.htlm or a redirect to /#!route to make angular happy
169 STATIC int redirectHTML5(struct MHD_Connection *connection, AFB_session *session, const char* url) {
173 struct MHD_Response *response;
174 AFB_staticfile staticfile;
176 // Url match /opa/xxxx should redirect to "/opa/#!page" to force index.html reload
177 strncpy(staticfile.path, session->config->rootbase, sizeof (staticfile.path));
178 strncat(staticfile.path, "/#!", sizeof (staticfile.path));
179 strncat(staticfile.path, &url[1], sizeof (staticfile.path));
180 response = MHD_create_response_from_buffer(0,"", MHD_RESPMEM_PERSISTENT);
181 MHD_add_response_header (response, "Location", staticfile.path);
182 MHD_queue_response (connection, MHD_HTTP_MOVED_PERMANENTLY, response);
183 if (verbose) fprintf (stderr,"checkHTML5 redirect to [%s]\n",staticfile.path);
188 // minimal httpd file server for static HTML,JS,CSS,etc...
189 STATIC int requestFile(struct MHD_Connection *connection, AFB_session *session, const char* url) {
191 AFB_staticfile staticfile;
192 char *requestdir, *requesturl;
194 // default search for file is rootdir base
195 requestdir= session->config->rootdir;
196 requesturl=(char*)url;
198 // Check for optional aliases
199 for (idx=0; session->config->aliasdir[idx].url != NULL; idx++) {
200 if (0 == strncmp(url, session->config->aliasdir[idx].url, session->config->aliasdir[idx].len)) {
201 requestdir = session->config->aliasdir[idx].path;
202 requesturl=(char*)&url[session->config->aliasdir[idx].len];
207 // build full path from rootdir + url
208 strncpy(staticfile.path, requestdir, sizeof (staticfile.path));
209 strncat(staticfile.path, requesturl, sizeof (staticfile.path));
211 // try to open file and get its size
212 if (-1 == (staticfile.fd = open(staticfile.path, O_RDONLY))) {
213 fprintf(stderr, "Fail to open file: [%s] error:%s\n", staticfile.path, strerror(errno));
216 // open file is OK let use it
217 ret = servFile (connection, session, url, &staticfile);
221 // Check and Dispatch HTTP request
222 STATIC int newRequest(void *cls,
223 struct MHD_Connection *connection,
227 const char *upload_data, size_t *upload_data_size, void **con_cls) {
229 AFB_session *session = cls;
230 struct MHD_Response *response;
233 // this is a REST API let's check for plugins
234 if (0 == strncmp(url, session->config->rootapi, apiUrlLen)) {
235 ret = doRestApi(connection, session, &url[apiUrlLen+1], method, upload_data, upload_data_size, con_cls);
239 // From here only accept get request
240 if (0 != strcmp(method, MHD_HTTP_METHOD_GET)) return MHD_NO; /* unexpected method */
242 // If a static file exist serve it now
243 ret = requestFile(connection, session, url);
244 if (ret != FAILED) return ret;
246 // no static was served let's try HTML5 OPA redirect
247 if (0 == strncmp(url, session->config->rootbase, baseUrlLen)) {
248 ret = redirectHTML5(connection, session, &url[baseUrlLen]);
252 // Nothing respond to this request Files, API, Angular Base
253 const char *errorstr = "<html><body>AFB-Daemon File Not Find file</body></html>";
254 response = MHD_create_response_from_buffer(strlen(errorstr), (void*)errorstr, MHD_RESPMEM_PERSISTENT);
255 ret = MHD_queue_response(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, response);
259 STATIC int newClient(void *cls, const struct sockaddr * addr, socklen_t addrlen) {
260 // check if client is coming from an acceptable IP
261 return (MHD_YES); // MHD_NO
265 PUBLIC AFB_error httpdStart(AFB_session *session) {
267 // compute fixed URL length at startup time
268 apiUrlLen = strlen (session->config->rootapi);
269 baseUrlLen= strlen (session->config->rootbase);
270 rootUrlLen= strlen (session->config->rootdir);
272 // Initialise Client Session Hash Table
273 ctxStoreInit (CTX_NBCLIENTS);
275 //TBD open libmagic cache [fail to pass EFENCE check (allocating 0 bytes)]
276 //initLibMagic (session);
280 printf("AFB:notice Waiting port=%d rootdir=%s\n", session->config->httpdPort, session->config->rootdir);
281 printf("AFB:notice Browser URL= http://localhost:%d\n", session->config->httpdPort);
284 session->httpd = (void*) MHD_start_daemon(
285 MHD_USE_EPOLL_LINUX_ONLY
286 | MHD_USE_TCP_FASTOPEN
289 session->config->httpdPort, // port
290 &newClient, NULL, // Tcp Accept call back + extra attribute
291 &newRequest, session, // Http Request Call back + extra attribute
292 MHD_OPTION_NOTIFY_COMPLETED, &endRequest, NULL,
293 MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 15, // 15 seconds
294 MHD_OPTION_END); // options-end
295 // TBD: MHD_OPTION_SOCK_ADDR
297 if (session->httpd == NULL) {
298 printf("Error: httpStart invalid httpd port: %d", session->config->httpdPort);
305 PUBLIC AFB_error httpdLoop(AFB_session *session) {
307 const union MHD_DaemonInfo *info;
310 info = MHD_get_daemon_info(session->httpd,
311 MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY);
313 printf("Error: httpLoop no pollfd");
316 pfd.fd = info->listen_fd;
319 if (verbose) fprintf(stderr, "AFB:notice entering httpd waiting loop\n");
321 if (verbose) fprintf(stderr, "AFB:notice httpd alive [%d]\n", count++);
322 poll(&pfd, 1, 15000); // 15 seconds (as above timeout when starting)
323 MHD_run(session->httpd);
327 // should never return from here
331 PUBLIC int httpdStatus(AFB_session *session) {
332 return (MHD_run(session->httpd));
335 PUBLIC void httpdStop(AFB_session *session) {
336 MHD_stop_daemon(session->httpd);