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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"
struct afb_req_post {
const char *upload_data;
size_t *upload_data_size;
};
struct afb_req {
AFB_session *session;
struct MHD_Connection *connection;
enum afb_method method;
const char *url;
size_t lenurl;
const char *tail;
size_t lentail;
struct afb_req **recorder;
int (*post_handler) (struct afb_req *, struct afb_req_post *);
int (*post_completed) (struct afb_req *, struct afb_req_post *);
void *post_data;
};
struct afb_req_handler {
struct afb_req_handler *next;
const char *prefix;
size_t length;
int (*handler) (struct afb_req *, struct afb_req_post *, void *);
void *data;
int priority;
};
static char empty_string[1] = "";
/* a valid subpath is a relative path not looking deeper than root using .. */
static int validsubpath(const char *subpath)
{
int l = 0, i = 0;
while (subpath[i]) {
switch (subpath[i++]) {
case '.':
if (!subpath[i])
break;
if (subpath[i] == '/') {
i++;
break;
}
if (subpath[i++] == '.') {
if (!subpath[i]) {
if (--l < 0)
return 0;
break;
}
if (subpath[i++] == '/') {
if (--l < 0)
return 0;
break;
}
}
default:
while (subpath[i] && subpath[i] != '/')
i++;
l++;
case '/':
break;
}
}
return 1;
}
/*
* Removes the 'prefix' of 'length' frome the tail of 'request'
* if and only if the prefix exists and is terminated by a leading
* slash
*/
int afb_req_unprefix(struct afb_req *request, const char *prefix, size_t length)
{
/* check the prefix ? */
if (length > request->lentail || (request->tail[length] && request->tail[length] != '/')
|| memcmp(prefix, request->tail, length))
return 0;
/* removes successives / */
while (length < request->lentail && request->tail[length + 1] == '/')
length++;
/* update the tail */
request->lentail -= length;
request->tail += length;
return 1;
}
int afb_req_valid_tail(struct afb_req *request)
{
return validsubpath(request->tail);
}
void afb_req_reply_error(struct afb_req *request, 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(request->connection, status, response))
fprintf(stderr, "Failed to reply error code %u", status);
MHD_destroy_response(response);
}
int afb_request_redirect_to(struct afb_req *request, const char *url)
{
struct MHD_Response *response;
response = MHD_create_response_from_buffer(0, empty_string, MHD_RESPMEM_PERSISTENT);
MHD_add_response_header(response, "Location", url);
MHD_queue_response(request->connection, MHD_HTTP_MOVED_PERMANENTLY, response);
MHD_destroy_response(response);
if (verbose)
fprintf(stderr, "redirect from [%s] to [%s]\n", request->url, url);
return 1;
}
int afb_request_one_page_api_redirect(struct afb_req *request, struct afb_req_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_request_redirect_to(request, url);
}
struct afb_req_handler *afb_req_handler_new(struct afb_req_handler *head, const char *prefix,
int (*handler) (struct afb_req *, struct afb_req_post *, void *),
void *data, int priority)
{
struct afb_req_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_req *, struct afb_req_post *, void *), void *data, int priority)
{
struct afb_req_handler *head;
head = afb_req_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_req *request, struct afb_req_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 afb_req_reply_file_if_exist(struct afb_req *request, int dirfd, const char *filename)
{
int rc;
int fd;
unsigned int status;
struct stat st;
char etag[1 + 2 * sizeof(int)];
const char *inm;
struct MHD_Response *response;
/* Opens the file or directory */
fd = openat(dirfd, filename, O_RDONLY);
if (fd < 0) {
if (errno == ENOENT)
return 0;
afb_req_reply_error(request, MHD_HTTP_FORBIDDEN);
return 1;
}
/* Retrieves file's status */
if (fstat(fd, &st) != 0) {
close(fd);
afb_req_reply_error(request, MHD_HTTP_INTERNAL_SERVER_ERROR);
return 1;
}
/* Don't serve directory */
if (S_ISDIR(st.st_mode)) {
rc = afb_req_reply_file_if_exist(request, fd, "index.html");
close(fd);
return rc;
}
/* Don't serve special files */
if (!S_ISREG(st.st_mode)) {
close(fd);
afb_req_reply_error(request, MHD_HTTP_FORBIDDEN);
return 1;
}
/* Check the method */
if ((request->method & (afb_method_get | afb_method_head)) == 0) {
close(fd);
afb_req_reply_error(request, MHD_HTTP_METHOD_NOT_ALLOWED);
return 1;
}
/* computes the etag */
sprintf(etag, "%08X%08X", ((int)(st.st_mtim.tv_sec) ^ (int)(st.st_mtim.tv_nsec)), (int)(st.st_size));
/* checks the etag */
inm = MHD_lookup_connection_value(request->connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_IF_NONE_MATCH);
if (inm && 0 == strcmp(inm, etag)) {
/* etag ok, return NOT MODIFIED */
close(fd);
if (verbose)
fprintf(stderr, "Not Modified: [%s]\n", filename);
response = MHD_create_response_from_buffer(0, empty_string, MHD_RESPMEM_PERSISTENT);
status = MHD_HTTP_NOT_MODIFIED;
} else {
/* check the size */
if (st.st_size != (off_t) (size_t) st.st_size) {
close(fd);
afb_req_reply_error(request, MHD_HTTP_INTERNAL_SERVER_ERROR);
return 1;
}
/* create the response */
response = MHD_create_response_from_fd((size_t) st.st_size, fd);
status = MHD_HTTP_OK;
#if defined(USE_MAGIC_MIME_TYPE)
/* set the type */
if (request->session->magic) {
const char *mimetype = magic_descriptor(request->session->magic, fd);
if (mimetype != NULL)
MHD_add_response_header(response, MHD_HTTP_HEADER_CONTENT_TYPE, mimetype);
}
#endif
}
/* fills the value and send */
MHD_add_response_header(response, MHD_HTTP_HEADER_CACHE_CONTROL, request->session->cacheTimeout);
MHD_add_response_header(response, MHD_HTTP_HEADER_ETAG, etag);
MHD_queue_response(request->connection, status, response);
MHD_destroy_response(response);
return 1;
}
static int afb_req_reply_file(struct afb_req *request, int dirfd, const char *filename)
{
int rc = afb_req_reply_file_if_exist(request, dirfd, filename);
if (rc == 0)
afb_req_reply_error(request, MHD_HTTP_NOT_FOUND);
return 1;
}
static int handle_alias(struct afb_req *request, struct afb_req_post *post, void *data)
{
char *path;
const char *alias = data;
size_t lenalias;
if (request->method != afb_method_get) {
afb_req_reply_error(request, MHD_HTTP_METHOD_NOT_ALLOWED);
return 1;
}
if (!validsubpath(request->tail)) {
afb_req_reply_error(request, MHD_HTTP_FORBIDDEN);
return 1;
}
lenalias = strlen(alias);
path = alloca(lenalias + request->lentail + 1);
memcpy(path, alias, lenalias);
memcpy(&path[lenalias], request->tail, request->lentail + 1);
return afb_req_reply_file(request, AT_FDCWD, path);
}
int afb_req_add_alias(AFB_session * session, const char *prefix, const char *alias, int priority)
{
return afb_req_add_handler(session, prefix, handle_alias, (void *)alias, priority);
}
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_req_post post;
struct afb_req request;
enum afb_method method;
AFB_session *session;
struct afb_req_handler *iter;
session = cls;
post.upload_data = upload_data;
post.upload_data_size = upload_data_size;
#if 0
struct afb_req *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_req_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_req **)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_req_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_req_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;
}
/* Initialise Client Session Hash Table */
ctxStoreInit(CTX_NBCLIENTS);
#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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