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/*
* Copyright 2016 IoT.bzh
* Author: José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <poll.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <microhttpd.h>
#include "afb-method.h"
#include "afb-hreq.h"
#include "afb-hsrv.h"
#include "afb-req-itf.h"
#include "verbose.h"
#include "utils-upoll.h"
#define JSON_CONTENT "application/json"
#define FORM_CONTENT MHD_HTTP_POST_ENCODING_MULTIPART_FORMDATA
struct hsrv_handler {
struct hsrv_handler *next;
const char *prefix;
size_t length;
int (*handler) (struct afb_hreq *, void *);
void *data;
int priority;
};
struct hsrv_alias {
const char *alias;
const char *directory;
size_t lendir;
int dirfd;
};
struct afb_hsrv {
unsigned refcount;
struct hsrv_handler *handlers;
struct MHD_Daemon *httpd;
struct upoll *upoll;
char *cache_to;
};
static void reply_error(struct MHD_Connection *connection, unsigned int status)
{
char *buffer;
int length;
struct MHD_Response *response;
length = asprintf(&buffer, "<html><body>error %u</body></html>", status);
if (length > 0)
response = MHD_create_response_from_buffer((unsigned)length, buffer, MHD_RESPMEM_MUST_FREE);
else {
buffer = "<html><body>error</body></html>";
response = MHD_create_response_from_buffer(strlen(buffer), buffer, MHD_RESPMEM_PERSISTENT);
}
if (!MHD_queue_response(connection, status, response))
fprintf(stderr, "Failed to reply error code %u", status);
MHD_destroy_response(response);
}
static int postproc(void *cls,
enum MHD_ValueKind kind,
const char *key,
const char *filename,
const char *content_type,
const char *transfer_encoding,
const char *data,
uint64_t off,
size_t size)
{
struct afb_hreq *hreq = cls;
if (filename != NULL)
return afb_hreq_post_add_file(hreq, key, filename, data, size);
else
return afb_hreq_post_add(hreq, key, data, size);
}
static int access_handler(
void *cls,
struct MHD_Connection *connection,
const char *url,
const char *methodstr,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **recordreq)
{
int rc;
struct afb_hreq *hreq;
enum afb_method method;
struct afb_hsrv *hsrv;
struct hsrv_handler *iter;
const char *type;
hsrv = cls;
hreq = *recordreq;
if (hreq == NULL) {
/* create the request */
hreq = calloc(1, sizeof *hreq);
if (hreq == NULL)
goto internal_error;
*recordreq = hreq;
/* get the method */
method = get_method(methodstr);
method &= afb_method_get | afb_method_post;
if (method == afb_method_none)
goto bad_request;
/* init the request */
hreq->cacheTimeout = hsrv->cache_to;
hreq->connection = connection;
hreq->method = method;
hreq->version = version;
hreq->tail = hreq->url = url;
hreq->lentail = hreq->lenurl = strlen(url);
/* init the post processing */
if (method == afb_method_post) {
type = afb_hreq_get_header(hreq, MHD_HTTP_HEADER_CONTENT_TYPE);
if (type == NULL) {
/* an empty post, let's process it as a get */
hreq->method = afb_method_get;
} else if (strcasestr(type, FORM_CONTENT) != NULL) {
hreq->postform = MHD_create_post_processor (connection, 65500, postproc, hreq);
if (hreq->postform == NULL)
goto internal_error;
return MHD_YES;
} else if (strcasestr(type, JSON_CONTENT) == NULL) {
reply_error(connection, MHD_HTTP_UNSUPPORTED_MEDIA_TYPE);
return MHD_YES;
}
}
}
/* process further data */
if (*upload_data_size) {
if (hreq->postform != NULL) {
if (!MHD_post_process (hreq->postform, upload_data, *upload_data_size))
goto internal_error;
} else {
if (!afb_hreq_post_add(hreq, "", upload_data, *upload_data_size))
goto internal_error;
}
*upload_data_size = 0;
return MHD_YES;
}
/* flush the data */
if (hreq->postform != NULL) {
rc = MHD_destroy_post_processor(hreq->postform);
hreq->postform = NULL;
if (rc == MHD_NO)
goto bad_request;
}
/* search an handler for the request */
iter = hsrv->handlers;
while (iter) {
if (afb_hreq_unprefix(hreq, iter->prefix, iter->length)) {
if (iter->handler(hreq, iter->data))
return MHD_YES;
hreq->tail = hreq->url;
hreq->lentail = hreq->lenurl;
}
iter = iter->next;
}
/* no handler */
afb_hreq_reply_error(hreq, MHD_HTTP_NOT_FOUND);
return MHD_YES;
bad_request:
reply_error(connection, MHD_HTTP_BAD_REQUEST);
return MHD_YES;
internal_error:
reply_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR);
return MHD_YES;
}
/* Because of POST call multiple time requestApi we need to free POST handle here */
static void end_handler(void *cls, struct MHD_Connection *connection, void **recordreq,
enum MHD_RequestTerminationCode toe)
{
struct afb_hreq *hreq;
hreq = *recordreq;
if (hreq->upgrade)
MHD_suspend_connection (connection);
afb_hreq_free(hreq);
}
static int new_client_handler(void *cls, const struct sockaddr *addr, socklen_t addrlen)
{
return MHD_YES;
}
static struct hsrv_handler *new_handler(
struct hsrv_handler *head,
const char *prefix,
int (*handler) (struct afb_hreq *, void *),
void *data,
int priority)
{
struct hsrv_handler *link, *iter, *previous;
size_t length;
/* get the length of the prefix without its leading / */
length = strlen(prefix);
while (length && prefix[length - 1] == '/')
length--;
/* allocates the new link */
link = malloc(sizeof *link);
if (link == NULL)
return NULL;
/* initialize it */
link->prefix = prefix;
link->length = length;
link->handler = handler;
link->data = data;
link->priority = priority;
/* adds it */
previous = NULL;
iter = head;
while (iter && (priority < iter->priority || (priority == iter->priority && length <= iter->length))) {
previous = iter;
iter = iter->next;
}
link->next = iter;
if (previous == NULL)
return link;
previous->next = link;
return head;
}
static int handle_alias(struct afb_hreq *hreq, void *data)
{
struct hsrv_alias *da = data;
if (hreq->method != afb_method_get) {
afb_hreq_reply_error(hreq, MHD_HTTP_METHOD_NOT_ALLOWED);
return 1;
}
if (!afb_hreq_valid_tail(hreq)) {
afb_hreq_reply_error(hreq, MHD_HTTP_FORBIDDEN);
return 1;
}
return afb_hreq_reply_file(hreq, da->dirfd, &hreq->tail[1]);
}
int afb_hsrv_add_handler(
struct afb_hsrv *hsrv,
const char *prefix,
int (*handler) (struct afb_hreq *, void *),
void *data,
int priority)
{
struct hsrv_handler *head;
head = new_handler(hsrv->handlers, prefix, handler, data, priority);
if (head == NULL)
return 0;
hsrv->handlers = head;
return 1;
}
int afb_hsrv_add_alias(struct afb_hsrv *hsrv, const char *prefix, const char *alias, int priority)
{
struct hsrv_alias *da;
int dirfd;
dirfd = open(alias, O_PATH|O_DIRECTORY);
if (dirfd < 0) {
/* TODO message */
return 0;
}
da = malloc(sizeof *da);
if (da != NULL) {
da->alias = prefix;
da->directory = alias;
da->lendir = strlen(da->directory);
da->dirfd = dirfd;
if (afb_hsrv_add_handler(hsrv, prefix, handle_alias, da, priority))
return 1;
free(da);
}
close(dirfd);
return 0;
}
int afb_hsrv_set_cache_timeout(struct afb_hsrv *hsrv, int duration)
{
int rc;
char *dur;
rc = asprintf(&dur, "%d", duration);
if (rc < 0)
return 0;
free(hsrv->cache_to);
hsrv->cache_to = dur;
return 1;
}
int afb_hsrv_start(struct afb_hsrv *hsrv, uint16_t port, unsigned int connection_timeout)
{
struct upoll *upoll;
struct MHD_Daemon *httpd;
const union MHD_DaemonInfo *info;
httpd = MHD_start_daemon(
MHD_USE_EPOLL_LINUX_ONLY | MHD_USE_TCP_FASTOPEN | MHD_USE_DEBUG | MHD_USE_SUSPEND_RESUME,
port, /* port */
new_client_handler, NULL, /* Tcp Accept call back + extra attribute */
access_handler, hsrv, /* Http Request Call back + extra attribute */
MHD_OPTION_NOTIFY_COMPLETED, end_handler, hsrv,
MHD_OPTION_CONNECTION_TIMEOUT, connection_timeout,
MHD_OPTION_END); /* options-end */
if (httpd == NULL) {
printf("Error: httpStart invalid httpd port: %d", (int)port);
return 0;
}
info = MHD_get_daemon_info(httpd, MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY);
if (info == NULL) {
MHD_stop_daemon(httpd);
fprintf(stderr, "Error: httpStart no pollfd");
return 0;
}
upoll = upoll_open(info->listen_fd, httpd);
if (upoll == NULL) {
MHD_stop_daemon(httpd);
fprintf(stderr, "Error: connection to upoll of httpd failed");
return 0;
}
upoll_on_readable(upoll, (void*)MHD_run);
hsrv->httpd = httpd;
hsrv->upoll = upoll;
return 1;
}
void afb_hsrv_stop(struct afb_hsrv *hsrv)
{
if (hsrv->upoll)
upoll_close(hsrv->upoll);
hsrv->upoll = NULL;
if (hsrv->httpd != NULL)
MHD_stop_daemon(hsrv->httpd);
hsrv->httpd = NULL;
}
struct afb_hsrv *afb_hsrv_create()
{
struct afb_hsrv *result = calloc(1, sizeof(struct afb_hsrv));
if (result != NULL)
result->refcount = 1;
return result;
}
void afb_hsrv_put(struct afb_hsrv *hsrv)
{
assert(hsrv->refcount != 0);
if (!--hsrv->refcount) {
afb_hsrv_stop(hsrv);
free(hsrv);
}
}
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