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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 <microhttpd.h>
#include <assert.h>
#include <poll.h>
#include <sys/stat.h>
#include "../include/local-def.h"
#include "afb-method.h"
#include "afb-hreq.h"
struct afb_hsrv_handler {
struct afb_hsrv_handler *next;
const char *prefix;
size_t length;
int (*handler) (struct afb_hreq *, struct afb_hreq_post *, void *);
void *data;
int priority;
};
struct afb_diralias {
const char *alias;
const char *directory;
size_t lendir;
int dirfd;
};
int afb_request_one_page_api_redirect(
struct afb_hreq *request,
struct afb_hreq_post *post,
void *data)
{
size_t plen;
char *url;
if (request->lentail >= 2 && request->tail[1] == '#')
return 0;
/*
* Here we have for example:
* url = "/pre/dir/page" lenurl = 13
* tail = "/dir/page" lentail = 9
*
* We will produce "/pre/#!dir/page"
*
* Let compute plen that include the / at end (for "/pre/")
*/
plen = request->lenurl - request->lentail + 1;
url = alloca(request->lenurl + 3);
memcpy(url, request->url, plen);
url[plen++] = '#';
url[plen++] = '!';
memcpy(&url[plen], &request->tail[1], request->lentail);
return afb_hreq_redirect_to(request, url);
}
struct afb_hsrv_handler *afb_hsrv_handler_new(
struct afb_hsrv_handler *head,
const char *prefix,
int (*handler) (struct afb_hreq *, struct afb_hreq_post *, void *),
void *data,
int priority)
{
struct afb_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;
}
int afb_req_add_handler(
AFB_session * session,
const char *prefix,
int (*handler) (struct afb_hreq *, struct afb_hreq_post *, void *),
void *data,
int priority)
{
struct afb_hsrv_handler *head;
head = afb_hsrv_handler_new(session->handlers, prefix, handler, data, priority);
if (head == NULL)
return 0;
session->handlers = head;
return 1;
}
static int relay_to_doRestApi(struct afb_hreq *request, struct afb_hreq_post *post, void *data)
{
return doRestApi(request->connection, request->session, &request->tail[1], get_method_name(request->method),
post->upload_data, post->upload_data_size, (void **)request->recorder);
}
static int handle_alias(struct afb_hreq *request, struct afb_hreq_post *post, void *data)
{
struct afb_diralias *da = data;
if (request->method != afb_method_get) {
afb_hreq_reply_error(request, MHD_HTTP_METHOD_NOT_ALLOWED);
return 1;
}
if (!afb_hreq_valid_tail(request)) {
afb_hreq_reply_error(request, MHD_HTTP_FORBIDDEN);
return 1;
}
return afb_hreq_reply_file(request, da->dirfd, &request->tail[1]);
}
int afb_req_add_alias(AFB_session * session, const char *prefix, const char *alias, int priority)
{
struct afb_diralias *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_req_add_handler(session, prefix, handle_alias, (void *)alias, priority))
return 1;
free(da);
}
close(dirfd);
return 0;
}
static int my_default_init(AFB_session * session)
{
int idx;
if (!afb_req_add_handler(session, session->config->rootapi, relay_to_doRestApi, NULL, 1))
return 0;
for (idx = 0; session->config->aliasdir[idx].url != NULL; idx++)
if (!afb_req_add_alias
(session, session->config->aliasdir[idx].url, session->config->aliasdir[idx].path, 0))
return 0;
if (!afb_req_add_alias(session, "", session->config->rootdir, -10))
return 0;
if (!afb_req_add_handler(session, session->config->rootbase, afb_request_one_page_api_redirect, NULL, -20))
return 0;
return 1;
}
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 **recorder)
{
struct afb_hreq_post post;
struct afb_hreq request;
enum afb_method method;
AFB_session *session;
struct afb_hsrv_handler *iter;
session = cls;
post.upload_data = upload_data;
post.upload_data_size = upload_data_size;
#if 0
struct afb_hreq *previous;
previous = *recorder;
if (previous) {
assert((void **)previous->recorder == recorder);
assert(previous->session == session);
assert(previous->connection == connection);
assert(previous->method == get_method(methodstr));
assert(previous->url == url);
/* TODO */
/*
assert(previous->post_handler != NULL);
previous->post_handler(previous, &post);
return MHD_NO;
*/
}
#endif
method = get_method(methodstr);
if (method == afb_method_none) {
afb_hreq_reply_error(&request, MHD_HTTP_BAD_REQUEST);
return MHD_YES;
}
/* init the request */
request.session = cls;
request.connection = connection;
request.method = method;
request.tail = request.url = url;
request.lentail = request.lenurl = strlen(url);
request.recorder = (struct afb_hreq **)recorder;
request.post_handler = NULL;
request.post_completed = NULL;
request.post_data = NULL;
/* search an handler for the request */
iter = session->handlers;
while (iter) {
if (afb_hreq_unprefix(&request, iter->prefix, iter->length)) {
if (iter->handler(&request, &post, iter->data))
return MHD_YES;
request.tail = request.url;
request.lentail = request.lenurl;
}
iter = iter->next;
}
/* no handler */
afb_hreq_reply_error(&request, method != afb_method_get ? MHD_HTTP_BAD_REQUEST : MHD_HTTP_NOT_FOUND);
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 **con_cls,
enum MHD_RequestTerminationCode toe)
{
AFB_PostHandle *posthandle = *con_cls;
/* if post handle was used let's free everything */
if (posthandle != NULL)
endPostRequest(posthandle);
}
static int new_client_handler(void *cls, const struct sockaddr *addr, socklen_t addrlen)
{
return MHD_YES;
}
#if defined(USE_MAGIC_MIME_TYPE)
#if !defined(MAGIC_DB)
#define MAGIC_DB "/usr/share/misc/magic.mgc"
#endif
static int init_lib_magic (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 0;
}
/* 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);
session->magic = NULL;
return 0;
*/
}
return 1;
}
#endif
AFB_error httpdStart(AFB_session * session)
{
if (!my_default_init(session)) {
printf("Error: initialisation of httpd failed");
return AFB_FATAL;
}
#if defined(USE_MAGIC_MIME_TYPE)
/*TBD open libmagic cache [fail to pass EFENCE check (allocating 0 bytes)] */
init_lib_magic (session);
#endif
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 = MHD_start_daemon(
MHD_USE_EPOLL_LINUX_ONLY | MHD_USE_TCP_FASTOPEN | MHD_USE_DEBUG,
(uint16_t) session->config->httpdPort, /* port */
new_client_handler, NULL, /* Tcp Accept call back + extra attribute */
access_handler, session, /* Http Request Call back + extra attribute */
MHD_OPTION_NOTIFY_COMPLETED, end_handler, session,
MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int)15, /* 15 seconds */
MHD_OPTION_END); /* options-end */
if (session->httpd == NULL) {
printf("Error: httpStart invalid httpd port: %d", session->config->httpdPort);
return AFB_FATAL;
}
return AFB_SUCCESS;
}
/* infinite loop */
AFB_error httpdLoop(AFB_session * session)
{
int count = 0;
const union MHD_DaemonInfo *info;
struct pollfd pfd;
info = MHD_get_daemon_info(session->httpd, MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY);
if (info == NULL) {
printf("Error: httpLoop no pollfd");
goto error;
}
pfd.fd = info->listen_fd;
pfd.events = POLLIN;
if (verbose)
fprintf(stderr, "AFB:notice entering httpd waiting loop\n");
while (TRUE) {
if (verbose)
fprintf(stderr, "AFB:notice httpd alive [%d]\n", count++);
poll(&pfd, 1, 15000); /* 15 seconds (as above timeout when starting) */
MHD_run(session->httpd);
}
error:
/* should never return from here */
return AFB_FATAL;
}
int httpdStatus(AFB_session * session)
{
return MHD_run(session->httpd);
}
void httpdStop(AFB_session * session)
{
MHD_stop_daemon(session->httpd);
}
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