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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"
// 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;
static int aipUrlLen=0; // do not compute apiurl for each call
static int baseUrlLen=0; // do not compute baseurl for each call
// 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, char *filepath, int fd) {
const char *etagCache;
char etagValue[15];
struct MHD_Response *response;
struct stat sbuf;
int ret;
if (fstat (fd, &sbuf) != 0) {
fprintf(stderr, "Fail to stat file: [%s] error:%s\n", filepath, strerror(errno));
return (FAILED);
}
// if url is a directory let's add index.html and redirect client
if (S_ISDIR (sbuf.st_mode)) {
strncpy (filepath, url, sizeof (filepath));
if (url [strlen (url) -1] != '/') strncat (filepath, "/", sizeof (filepath));
strncat (filepath, "index.html", sizeof (filepath));
close (fd);
response = MHD_create_response_from_buffer (0,"", MHD_RESPMEM_PERSISTENT);
MHD_add_response_header (response,MHD_HTTP_HEADER_LOCATION, filepath);
ret = MHD_queue_response (connection, MHD_HTTP_MOVED_PERMANENTLY, response);
} else if (! S_ISREG (sbuf.st_mode)) { // only standard file any other one including symbolic links are refused.
fprintf (stderr, "Fail file: [%s] is not a regular file\n", filepath);
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);
ret = MHD_queue_response (connection, MHD_HTTP_INTERNAL_SERVER_ERROR, response);
} else {
// 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(fd); // file did not change since last upload
if (verbose) fprintf(stderr, "Not Modify: [%s]\n", filepath);
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);
ret = MHD_queue_response(connection, MHD_HTTP_NOT_MODIFIED, response);
} else { // it's a new file, we need to upload it to client
if (verbose) fprintf(stderr, "Serving: [%s]\n", filepath);
response = MHD_create_response_from_fd(sbuf.st_size, 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);
ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
}
}
MHD_destroy_response(response);
return (ret);
}
// 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;
int ret;
char filepath [512];
// build full path from rootdir + url
strncpy(filepath, session->config->rootdir, sizeof (filepath));
strncat(filepath, url, 511);
// try to open file and get its size
if (-1 == (fd = open(filepath, O_RDONLY))) {
fprintf(stderr, "Fail to open file: [%s] error:%s\n", filepath, strerror(errno));
return (FAILED);
}
// open file is OK let use it
ret = servFile (connection, session, url, filepath, fd);
return ret;
}
// this function return either Index.htlm or a redirect to /#!route to make angular happy
STATIC int checkHTML5(struct MHD_Connection *connection, AFB_session *session, const char* url) {
int fd;
int ret;
struct MHD_Response *response;
char filepath [512];
// if requesting '/' serve index.html
if (strlen (url) == 0) {
strncpy(filepath, session->config->rootdir, sizeof (filepath));
strncat(filepath, "/index.html", sizeof (filepath));
// try to open file and get its size
if (-1 == (fd = open(filepath, O_RDONLY))) {
fprintf(stderr, "Fail to open file: [%s] error:%s\n", filepath, strerror(errno));
// 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);
ret = MHD_YES;
return (FAILED);
} else {
ret = servFile (connection, session, url, filepath, fd);
return ret;
}
}
// we are facing a internal route within the HTML5 OnePageApp let's redirect ex: /myapp/#!user/login
strncpy(filepath, session->config->rootbase, sizeof (filepath));
strncat(filepath, "#!", sizeof (filepath));
strncat(filepath, url, sizeof (filepath));
response = MHD_create_response_from_buffer(session->config->html5.len,(void *)session->config->html5.msg, MHD_RESPMEM_PERSISTENT);
MHD_add_response_header (response, "Location", "http://somesite.com/page.html");
MHD_queue_response (connection, MHD_HTTP_OK, response);
}
// 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 an Angular request we change URL /!#xxxxx
if (0 == strncmp(url, session->config->rootapi, baseUrlLen)) {
ret = doRestApi(connection, session, method, &url[baseUrlLen]);
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 check for Angular redirect
if (0 == strncmp(url, session->config->rootbase, baseUrlLen)) {
ret = checkHTML5(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 comming from an acceptable IP
return (MHD_YES); // MHD_NO
}
PUBLIC AFB_ERROR httpdStart(AFB_session *session) {
// do this only once
aipUrlLen = strlen (session->config->rootapi);
baseUrlLen = strlen (session->config->rootbase);
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");
(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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