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/*
* Copyright (C) 2015 "IoT.bzh"
* Author "Fulup Ar Foll"
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Handle standard HTTP request
* Features/Restriction:
- handle ETAG to limit upload to modified/new files [cache default 3600s]
- handles redirect to index.htlm when path is a directory [code 301]
- only support GET method
- does not follow link.
References: https://www.gnu.org/software/libmicrohttpd/manual/html_node/index.html#Top
http://libmicrohttpd.sourcearchive.com/documentation/0.4.2/microhttpd_8h.html
https://gnunet.org/svn/libmicrohttpd/src/examples/fileserver_example_external_select.c
https://github.com/json-c/json-c
POST https://www.gnu.org/software/libmicrohttpd/manual/html_node/microhttpd_002dpost.html#microhttpd_002dpost
*/
#include <microhttpd.h>
#include <sys/stat.h>
#include "../include/local-def.h"
// let's compute fixed URL length only once
static apiUrlLen=0;
static baseUrlLen=0;
static rootUrlLen=0;
// proto missing from GCC
char *strcasestr(const char *haystack, const char *needle);
static int rqtcount = 0; // dummy request rqtcount to make each message be different
static int postcount = 0;
// try to open libmagic to handle mime types
static AFB_error initLibMagic (AFB_session *session) {
/*MAGIC_MIME tells magic to return a mime of the file, but you can specify different things*/
if (verbose) printf("Loading mimetype default magic database\n");
session->magic = magic_open(MAGIC_MIME_TYPE);
if (session->magic == NULL) {
fprintf(stderr,"ERROR: unable to initialize magic library\n");
return AFB_FAIL;
}
// Warning: should not use NULL for DB [libmagic bug wont pass efence check]
if (magic_load(session->magic, MAGIC_DB) != 0) {
fprintf(stderr,"cannot load magic database - %s\n", magic_error(session->magic));
magic_close(session->magic);
return AFB_FAIL;
}
return AFB_SUCCESS;
}
// Because of POST call multiple time requestApi we need to free POST handle here
static void endRequest (void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe) {
AFB_HttpPost *posthandle = *con_cls;
// if post handle was used let's free everything
if (posthandle) {
if (verbose) fprintf (stderr, "End Post Request UID=%d\n", posthandle->uid);
free (posthandle->data);
free (posthandle);
}
}
// Create check etag value
STATIC void computeEtag(char *etag, int maxlen, struct stat *sbuf) {
int time;
time = sbuf->st_mtim.tv_sec;
snprintf(etag, maxlen, "%d", time);
}
STATIC int servFile (struct MHD_Connection *connection, AFB_session *session, const char *url, AFB_staticfile *staticfile) {
const char *etagCache, *mimetype;
char etagValue[15];
struct MHD_Response *response;
struct stat sbuf;
int ret;
if (fstat (staticfile->fd, &sbuf) != 0) {
fprintf(stderr, "Fail to stat file: [%s] error:%s\n", staticfile->path, strerror(errno));
goto abortRequest;
}
if (! S_ISREG (sbuf.st_mode)) { // only standard file any other one including symbolic links are refused.
close (staticfile->fd); // nothing useful to do with this file
fprintf (stderr, "Fail file: [%s] is not a regular file\n", staticfile->path);
const char *errorstr = "<html><body>Alsa-Json-Gateway Invalid file type</body></html>";
response = MHD_create_response_from_buffer (strlen (errorstr),
(void *) errorstr, MHD_RESPMEM_PERSISTENT);
MHD_queue_response (connection, MHD_HTTP_INTERNAL_SERVER_ERROR, response);
goto sendRequest;
}
// if url is a directory let's add index.html and redirect client
if (S_ISDIR (sbuf.st_mode)) {
close (staticfile->fd); // close directory check for Index
// No trailing '/'. Let's add one and redirect for relative paths to work
if (url [strlen (url) -1] != '/') {
response = MHD_create_response_from_buffer(0,"", MHD_RESPMEM_PERSISTENT);
strncat(staticfile->path, "/", sizeof (staticfile->path));
MHD_add_response_header (response, "Location", staticfile->path);
MHD_queue_response (connection, MHD_HTTP_MOVED_PERMANENTLY, response);
if (verbose) fprintf (stderr,"Adding trailing '/' [%s]\n",staticfile->path);
goto sendRequest;
}
strncat (staticfile->path, OPA_INDEX, sizeof (staticfile->path));
if (-1 == (staticfile->fd = open(staticfile->path, O_RDONLY)) || (fstat (staticfile->fd, &sbuf) != 0)) {
fprintf(stderr, "No Index.html in direcory [%s]\n", staticfile->path);
goto abortRequest;
}
}
// https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching?hl=fr
// ftp://ftp.heanet.ie/disk1/www.gnu.org/software/libmicrohttpd/doxygen/dc/d0c/microhttpd_8h.html
// Check etag value and load file only when modification date changes
etagCache = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_IF_NONE_MATCH);
computeEtag(etagValue, sizeof (etagValue), &sbuf);
if (etagCache != NULL && strcmp(etagValue, etagCache) == 0) {
close(staticfile->fd); // file did not change since last upload
if (verbose) fprintf(stderr, "Not Modify: [%s]\n", staticfile->path);
response = MHD_create_response_from_buffer(0, "", MHD_RESPMEM_PERSISTENT);
MHD_add_response_header(response, MHD_HTTP_HEADER_CACHE_CONTROL, session->cacheTimeout); // default one hour cache
MHD_add_response_header(response, MHD_HTTP_HEADER_ETAG, etagValue);
MHD_queue_response(connection, MHD_HTTP_NOT_MODIFIED, response);
} else { // it's a new file, we need to upload it to client
// if we have magic let's try to guest mime type
if (session->magic) {
mimetype= magic_descriptor(session->magic, staticfile->fd);
if (mimetype != NULL) MHD_add_response_header (response, MHD_HTTP_HEADER_CONTENT_TYPE, mimetype);
} else mimetype="Unknown";
if (verbose) fprintf(stderr, "Serving: [%s] mime=%s\n", staticfile->path, mimetype);
response = MHD_create_response_from_fd(sbuf.st_size, staticfile->fd);
MHD_add_response_header(response, MHD_HTTP_HEADER_CACHE_CONTROL, session->cacheTimeout); // default one hour cache
MHD_add_response_header(response, MHD_HTTP_HEADER_ETAG, etagValue);
MHD_queue_response(connection, MHD_HTTP_OK, response);
}
sendRequest:
MHD_destroy_response(response);
return (MHD_YES);
abortRequest:
return (FAILED);
}
// this function return either Index.htlm or a redirect to /#!route to make angular happy
STATIC int redirectHTML5(struct MHD_Connection *connection, AFB_session *session, const char* url) {
int fd;
int ret;
struct MHD_Response *response;
AFB_staticfile staticfile;
// Url match /opa/xxxx should redirect to "/opa/#!page" to force index.html reload
strncpy(staticfile.path, session->config->rootbase, sizeof (staticfile.path));
strncat(staticfile.path, "/#!", sizeof (staticfile.path));
strncat(staticfile.path, &url[1], sizeof (staticfile.path));
response = MHD_create_response_from_buffer(0,"", MHD_RESPMEM_PERSISTENT);
MHD_add_response_header (response, "Location", staticfile.path);
MHD_queue_response (connection, MHD_HTTP_MOVED_PERMANENTLY, response);
if (verbose) fprintf (stderr,"checkHTML5 redirect to [%s]\n",staticfile.path);
return (MHD_YES);
}
// minimal httpd file server for static HTML,JS,CSS,etc...
STATIC int requestFile(struct MHD_Connection *connection, AFB_session *session, const char* url) {
int fd, ret, idx;
AFB_staticfile staticfile;
char *requestdir, *requesturl;
// default search for file is rootdir base
requestdir = session->config->rootdir;
requesturl=url;
// Check for optional aliases
for (idx=0; session->config->aliasdir[idx].url != NULL; idx++) {
if (0 == strncmp(url, session->config->aliasdir[idx].url, session->config->aliasdir[idx].len)) {
requestdir = session->config->aliasdir[idx].path;
requesturl=&url[session->config->aliasdir[idx].len];
break;
}
}
// build full path from rootdir + url
strncpy(staticfile.path, requestdir, sizeof (staticfile.path));
strncat(staticfile.path, requesturl, sizeof (staticfile.path));
// try to open file and get its size
if (-1 == (staticfile.fd = open(staticfile.path, O_RDONLY))) {
fprintf(stderr, "Fail to open file: [%s] error:%s\n", staticfile.path, strerror(errno));
return (FAILED);
}
// open file is OK let use it
ret = servFile (connection, session, url, &staticfile);
return ret;
}
// Check and Dispatch HTTP request
STATIC int newRequest(void *cls,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data, size_t *upload_data_size, void **con_cls) {
AFB_session *session = cls;
struct MHD_Response *response;
int ret;
// this is a REST API let's check for plugins
if (0 == strncmp(url, session->config->rootapi, apiUrlLen)) {
ret = doRestApi(connection, session, &url[apiUrlLen+1], method, upload_data, upload_data_size, con_cls);
return ret;
}
// From here only accept get request
if (0 != strcmp(method, MHD_HTTP_METHOD_GET)) return MHD_NO; /* unexpected method */
// If a static file exist serve it now
ret = requestFile(connection, session, url);
if (ret != FAILED) return ret;
// no static was served let's try HTML5 OPA redirect
if (0 == strncmp(url, session->config->rootbase, baseUrlLen)) {
ret = redirectHTML5(connection, session, &url[baseUrlLen]);
return ret;
}
// Nothing respond to this request Files, API, Angular Base
const char *errorstr = "<html><body>Alsa-Json-Gateway Unknown or Not readable file</body></html>";
response = MHD_create_response_from_buffer(strlen(errorstr), (void*)errorstr, MHD_RESPMEM_PERSISTENT);
ret = MHD_queue_response(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, response);
return (MHD_YES);
}
STATIC int newClient(void *cls, const struct sockaddr * addr, socklen_t addrlen) {
// check if client is coming from an acceptable IP
return (MHD_YES); // MHD_NO
}
PUBLIC AFB_error httpdStart(AFB_session *session) {
// compute fixed URL length at startup time
apiUrlLen = strlen (session->config->rootapi);
baseUrlLen= strlen (session->config->rootbase);
rootUrlLen= strlen (session->config->rootdir);
// TBD open libmagic cache [fail to pass EFENCE check]
// initLibMagic (session);
if (verbose) {
printf("AFB:notice Waiting port=%d rootdir=%s\n", session->config->httpdPort, session->config->rootdir);
printf("AFB:notice Browser URL= http://localhost:%d\n", session->config->httpdPort);
}
session->httpd = (void*) MHD_start_daemon(
MHD_USE_SELECT_INTERNALLY | MHD_USE_DEBUG, // use request and not threads
session->config->httpdPort, // port
&newClient, NULL, // Tcp Accept call back + extra attribute
&newRequest, session, // Http Request Call back + extra attribute
MHD_OPTION_NOTIFY_COMPLETED, &endRequest, NULL,
MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 15, MHD_OPTION_END); // 15s + options-end
// TBD: MHD_OPTION_SOCK_ADDR
if (session->httpd == NULL) {
printf("Error: httpStart invalid httpd port: %d", session->config->httpdPort);
return AFB_FATAL;
}
return AFB_SUCCESS;
}
// infinite loop
PUBLIC AFB_error httpdLoop(AFB_session *session) {
static int count = 0;
if (verbose) fprintf(stderr, "AFB:notice entering httpd waiting loop\n");
if (session->foreground) {
while (TRUE) {
fprintf(stderr, "AFB:notice Use Ctrl-C to quit\n");
(void) getc(stdin);
}
} else {
while (TRUE) {
sleep(3600);
if (verbose) fprintf(stderr, "AFB:notice httpd alive [%d]\n", count++);
}
}
// should never return from here
return AFB_FATAL;
}
PUBLIC int httpdStatus(AFB_session *session) {
return (MHD_run(session->httpd));
}
PUBLIC void httpdStop(AFB_session *session) {
MHD_stop_daemon(session->httpd);
}
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