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/*
* Copyright (C) 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <microhttpd.h>
#include <json-c/json.h>
#if defined(USE_MAGIC_MIME_TYPE)
#include <magic.h>
#endif
#include "afb-method.h"
#include <afb/afb-req-itf.h>
#include "afb-msg-json.h"
#include "afb-context.h"
#include "afb-hreq.h"
#include "session.h"
#include "verbose.h"
#define SIZE_RESPONSE_BUFFER 8192
static char empty_string[] = "";
static const char long_key_for_uuid[] = "x-afb-uuid";
static const char short_key_for_uuid[] = "uuid";
static const char long_key_for_token[] = "x-afb-token";
static const char short_key_for_token[] = "token";
static const char long_key_for_reqid[] = "x-afb-reqid";
static const char short_key_for_reqid[] = "reqid";
static char *cookie_name = NULL;
static char *cookie_setter = NULL;
static char *tmp_pattern = NULL;
/*
* Structure for storing key/values read from POST requests
*/
struct hreq_data {
struct hreq_data *next; /* chain to next data */
char *key; /* key name */
size_t length; /* length of the value (used for appending) */
char *value; /* the value (or original filename) */
char *path; /* path of the file saved */
};
static struct json_object *req_json(struct afb_hreq *hreq);
static struct afb_arg req_get(struct afb_hreq *hreq, const char *name);
static void req_fail(struct afb_hreq *hreq, const char *status, const char *info);
static void req_success(struct afb_hreq *hreq, json_object *obj, const char *info);
static const char *req_raw(struct afb_hreq *hreq, size_t *size);
static void req_send(struct afb_hreq *hreq, const char *buffer, size_t size);
static int req_subscribe_unsubscribe_error(struct afb_hreq *hreq, struct afb_event event);
const struct afb_req_itf afb_hreq_req_itf = {
.json = (void*)req_json,
.get = (void*)req_get,
.success = (void*)req_success,
.fail = (void*)req_fail,
.raw = (void*)req_raw,
.send = (void*)req_send,
.context_get = (void*)afb_context_get,
.context_set = (void*)afb_context_set,
.addref = (void*)afb_hreq_addref,
.unref = (void*)afb_hreq_unref,
.session_close = (void*)afb_context_close,
.session_set_LOA = (void*)afb_context_change_loa,
.subscribe = (void*)req_subscribe_unsubscribe_error,
.unsubscribe = (void*)req_subscribe_unsubscribe_error
};
static struct hreq_data *get_data(struct afb_hreq *hreq, const char *key, int create)
{
struct hreq_data *data = hreq->data;
while (data != NULL) {
if (!strcasecmp(data->key, key))
return data;
data = data->next;
}
if (create) {
data = calloc(1, sizeof *data);
if (data != NULL) {
data->key = strdup(key);
if (data->key == NULL) {
free(data);
data = NULL;
} else {
data->next = hreq->data;
hreq->data = data;
}
}
}
return data;
}
/* 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;
}
static void afb_hreq_reply_v(struct afb_hreq *hreq, unsigned status, struct MHD_Response *response, va_list args)
{
char *cookie;
const char *k, *v;
if (hreq->replied != 0)
return;
k = va_arg(args, const char *);
while (k != NULL) {
v = va_arg(args, const char *);
MHD_add_response_header(response, k, v);
k = va_arg(args, const char *);
}
v = afb_context_sent_uuid(&hreq->context);
if (v != NULL && asprintf(&cookie, cookie_setter, v) > 0) {
MHD_add_response_header(response, MHD_HTTP_HEADER_SET_COOKIE, cookie);
free(cookie);
}
MHD_queue_response(hreq->connection, status, response);
MHD_destroy_response(response);
hreq->replied = 1;
if (hreq->suspended != 0) {
extern void run_micro_httpd(struct afb_hsrv *hsrv);
MHD_resume_connection (hreq->connection);
hreq->suspended = 0;
run_micro_httpd(hreq->hsrv);
}
}
void afb_hreq_reply(struct afb_hreq *hreq, unsigned status, struct MHD_Response *response, ...)
{
va_list args;
va_start(args, response);
afb_hreq_reply_v(hreq, status, response, args);
va_end(args);
}
void afb_hreq_reply_empty(struct afb_hreq *hreq, unsigned status, ...)
{
va_list args;
va_start(args, status);
afb_hreq_reply_v(hreq, status, MHD_create_response_from_buffer(0, NULL, MHD_RESPMEM_PERSISTENT), args);
va_end(args);
}
void afb_hreq_reply_static(struct afb_hreq *hreq, unsigned status, size_t size, const char *buffer, ...)
{
va_list args;
va_start(args, buffer);
afb_hreq_reply_v(hreq, status, MHD_create_response_from_buffer((unsigned)size, (char*)buffer, MHD_RESPMEM_PERSISTENT), args);
va_end(args);
}
void afb_hreq_reply_copy(struct afb_hreq *hreq, unsigned status, size_t size, const char *buffer, ...)
{
va_list args;
va_start(args, buffer);
afb_hreq_reply_v(hreq, status, MHD_create_response_from_buffer((unsigned)size, (char*)buffer, MHD_RESPMEM_MUST_COPY), args);
va_end(args);
}
void afb_hreq_reply_free(struct afb_hreq *hreq, unsigned status, size_t size, char *buffer, ...)
{
va_list args;
va_start(args, buffer);
afb_hreq_reply_v(hreq, status, MHD_create_response_from_buffer((unsigned)size, buffer, MHD_RESPMEM_MUST_FREE), args);
va_end(args);
}
#if defined(USE_MAGIC_MIME_TYPE)
#if !defined(MAGIC_DB)
#define MAGIC_DB "/usr/share/misc/magic.mgc"
#endif
static magic_t lazy_libmagic()
{
static int done = 0;
static magic_t result = NULL;
if (!done) {
done = 1;
/* MAGIC_MIME tells magic to return a mime of the file,
but you can specify different things */
INFO("Loading mimetype default magic database");
result = magic_open(MAGIC_MIME_TYPE);
if (result == NULL) {
ERROR("unable to initialize magic library");
}
/* Warning: should not use NULL for DB
[libmagic bug wont pass efence check] */
else if (magic_load(result, MAGIC_DB) != 0) {
ERROR("cannot load magic database: %s", magic_error(result));
magic_close(result);
result = NULL;
}
}
return result;
}
static const char *magic_mimetype_fd(int fd)
{
magic_t lib = lazy_libmagic();
return lib ? magic_descriptor(lib, fd) : NULL;
}
#endif
static const char *mimetype_fd_name(int fd, const char *filename)
{
const char *result = NULL;
#if defined(INFER_EXTENSION)
const char *extension = strrchr(filename, '.');
if (extension) {
static const char *const known[][2] = {
{ ".js", "text/javascript" },
{ ".html", "text/html" },
{ ".css", "text/css" },
{ NULL, NULL }
};
int i = 0;
while (known[i][0]) {
if (!strcasecmp(extension, known[i][0])) {
result = known[i][1];
break;
}
i++;
}
}
#endif
#if defined(USE_MAGIC_MIME_TYPE)
if (result == NULL)
result = magic_mimetype_fd(fd);
#endif
return result;
}
void afb_hreq_addref(struct afb_hreq *hreq)
{
hreq->refcount++;
}
void afb_hreq_unref(struct afb_hreq *hreq)
{
struct hreq_data *data;
if (hreq == NULL || --hreq->refcount)
return;
if (hreq->postform != NULL)
MHD_destroy_post_processor(hreq->postform);
for (data = hreq->data; data; data = hreq->data) {
hreq->data = data->next;
if (data->path) {
unlink(data->path);
free(data->path);
}
free(data->key);
free(data->value);
free(data);
}
afb_context_disconnect(&hreq->context);
json_object_put(hreq->json);
free(hreq);
}
/*
* Removes the 'prefix' of 'length' from the tail of 'hreq'
* if and only if the prefix exists and is terminated by a leading
* slash
*/
int afb_hreq_unprefix(struct afb_hreq *hreq, const char *prefix, size_t length)
{
/* check the prefix ? */
if (length > hreq->lentail || (hreq->tail[length] && hreq->tail[length] != '/')
|| strncasecmp(prefix, hreq->tail, length))
return 0;
/* removes successives / */
while (length < hreq->lentail && hreq->tail[length + 1] == '/')
length++;
/* update the tail */
hreq->lentail -= length;
hreq->tail += length;
return 1;
}
int afb_hreq_valid_tail(struct afb_hreq *hreq)
{
return validsubpath(hreq->tail);
}
void afb_hreq_reply_error(struct afb_hreq *hreq, unsigned int status)
{
afb_hreq_reply_empty(hreq, status, NULL);
}
int afb_hreq_reply_file_if_exist(struct afb_hreq *hreq, int dirfd, const char *filename)
{
int rc;
int fd;
unsigned int status;
struct stat st;
char etag[1 + 2 * 8];
const char *inm;
struct MHD_Response *response;
const char *mimetype;
/* Opens the file or directory */
if (filename[0]) {
fd = openat(dirfd, filename, O_RDONLY);
if (fd < 0) {
if (errno == ENOENT)
return 0;
afb_hreq_reply_error(hreq, MHD_HTTP_FORBIDDEN);
return 1;
}
} else {
fd = dup(dirfd);
if (fd < 0) {
afb_hreq_reply_error(hreq, MHD_HTTP_INTERNAL_SERVER_ERROR);
return 1;
}
}
/* Retrieves file's status */
if (fstat(fd, &st) != 0) {
close(fd);
afb_hreq_reply_error(hreq, MHD_HTTP_INTERNAL_SERVER_ERROR);
return 1;
}
/* serve directory */
if (S_ISDIR(st.st_mode)) {
if (hreq->url[hreq->lenurl - 1] != '/') {
/* the redirect is needed for reliability of relative path */
char *tourl = alloca(hreq->lenurl + 2);
memcpy(tourl, hreq->url, hreq->lenurl);
tourl[hreq->lenurl] = '/';
tourl[hreq->lenurl + 1] = 0;
rc = afb_hreq_redirect_to(hreq, tourl, 1);
} else {
static const char *indexes[] = { "index.html", NULL };
int i = 0;
rc = 0;
while (indexes[i] != NULL) {
if (faccessat(fd, indexes[i], R_OK, 0) == 0) {
rc = afb_hreq_reply_file_if_exist(hreq, fd, indexes[i]);
break;
}
i++;
}
}
close(fd);
return rc;
}
/* Don't serve special files */
if (!S_ISREG(st.st_mode)) {
close(fd);
afb_hreq_reply_error(hreq, MHD_HTTP_FORBIDDEN);
return 1;
}
/* Check the method */
if ((hreq->method & (afb_method_get | afb_method_head)) == 0) {
close(fd);
afb_hreq_reply_error(hreq, 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(hreq->connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_IF_NONE_MATCH);
if (inm && 0 == strcmp(inm, etag)) {
/* etag ok, return NOT MODIFIED */
close(fd);
DEBUG("Not Modified: [%s]", 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_hreq_reply_error(hreq, 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;
/* set the type */
mimetype = mimetype_fd_name(fd, filename);
if (mimetype != NULL)
MHD_add_response_header(response, MHD_HTTP_HEADER_CONTENT_TYPE, mimetype);
}
/* fills the value and send */
afb_hreq_reply(hreq, status, response,
MHD_HTTP_HEADER_CACHE_CONTROL, hreq->cacheTimeout,
MHD_HTTP_HEADER_ETAG, etag,
NULL);
return 1;
}
int afb_hreq_reply_file(struct afb_hreq *hreq, int dirfd, const char *filename)
{
int rc = afb_hreq_reply_file_if_exist(hreq, dirfd, filename);
if (rc == 0)
afb_hreq_reply_error(hreq, MHD_HTTP_NOT_FOUND);
return 1;
}
struct _mkq_ {
int count;
size_t length;
size_t alloc;
char *text;
};
static void _mkq_add_(struct _mkq_ *mkq, char value)
{
char *text = mkq->text;
if (text != NULL) {
if (mkq->length == mkq->alloc) {
mkq->alloc += 100;
text = realloc(text, mkq->alloc);
if (text == NULL) {
free(mkq->text);
mkq->text = NULL;
return;
}
mkq->text = text;
}
text[mkq->length++] = value;
}
}
static void _mkq_add_hex_(struct _mkq_ *mkq, char value)
{
_mkq_add_(mkq, (char)(value < 10 ? value + '0' : value + 'A' - 10));
}
static void _mkq_add_esc_(struct _mkq_ *mkq, char value)
{
_mkq_add_(mkq, '%');
_mkq_add_hex_(mkq, (char)((value >> 4) & 15));
_mkq_add_hex_(mkq, (char)(value & 15));
}
static void _mkq_add_char_(struct _mkq_ *mkq, char value)
{
if (value <= ' ' || value >= 127)
_mkq_add_esc_(mkq, value);
else
switch(value) {
case '=':
case '&':
case '%':
_mkq_add_esc_(mkq, value);
break;
default:
_mkq_add_(mkq, value);
}
}
static void _mkq_append_(struct _mkq_ *mkq, const char *value)
{
while(*value)
_mkq_add_char_(mkq, *value++);
}
static int _mkquery_(struct _mkq_ *mkq, enum MHD_ValueKind kind, const char *key, const char *value)
{
_mkq_add_(mkq, mkq->count++ ? '&' : '?');
_mkq_append_(mkq, key);
if (value != NULL) {
_mkq_add_(mkq, '=');
_mkq_append_(mkq, value);
}
return 1;
}
static char *url_with_query(struct afb_hreq *hreq, const char *url)
{
struct _mkq_ mkq;
mkq.count = 0;
mkq.length = strlen(url);
mkq.alloc = mkq.length + 1000;
mkq.text = malloc(mkq.alloc);
if (mkq.text != NULL) {
strcpy(mkq.text, url);
MHD_get_connection_values(hreq->connection, MHD_GET_ARGUMENT_KIND, (void*)_mkquery_, &mkq);
_mkq_add_(&mkq, 0);
}
return mkq.text;
}
int afb_hreq_redirect_to(struct afb_hreq *hreq, const char *url, int add_query_part)
{
const char *to;
char *wqp;
wqp = add_query_part ? url_with_query(hreq, url) : NULL;
to = wqp ? : url;
afb_hreq_reply_static(hreq, MHD_HTTP_MOVED_PERMANENTLY, 0, NULL,
MHD_HTTP_HEADER_LOCATION, to, NULL);
DEBUG("redirect from [%s] to [%s]", hreq->url, url);
free(wqp);
return 1;
}
const char *afb_hreq_get_cookie(struct afb_hreq *hreq, const char *name)
{
return MHD_lookup_connection_value(hreq->connection, MHD_COOKIE_KIND, name);
}
const char *afb_hreq_get_argument(struct afb_hreq *hreq, const char *name)
{
struct hreq_data *data = get_data(hreq, name, 0);
return data ? data->value : MHD_lookup_connection_value(hreq->connection, MHD_GET_ARGUMENT_KIND, name);
}
const char *afb_hreq_get_header(struct afb_hreq *hreq, const char *name)
{
return MHD_lookup_connection_value(hreq->connection, MHD_HEADER_KIND, name);
}
int afb_hreq_post_add(struct afb_hreq *hreq, const char *key, const char *data, size_t size)
{
void *p;
struct hreq_data *hdat = get_data(hreq, key, 1);
if (hdat->path != NULL) {
return 0;
}
p = realloc(hdat->value, hdat->length + size + 1);
if (p == NULL) {
return 0;
}
hdat->value = p;
memcpy(&hdat->value[hdat->length], data, size);
hdat->length += size;
hdat->value[hdat->length] = 0;
return 1;
}
int afb_hreq_init_download_path(const char *directory)
{
struct stat st;
size_t n;
char *p;
if (access(directory, R_OK|W_OK)) {
/* no read/write access */
return -1;
}
if (stat(directory, &st)) {
/* can't get info */
return -1;
}
if (!S_ISDIR(st.st_mode)) {
/* not a directory */
errno = ENOTDIR;
return -1;
}
n = strlen(directory);
while(n > 1 && directory[n-1] == '/') n--;
p = malloc(n + 8);
if (p == NULL) {
/* can't allocate memory */
errno = ENOMEM;
return -1;
}
memcpy(p, directory, n);
p[n++] = '/';
p[n++] = 'X';
p[n++] = 'X';
p[n++] = 'X';
p[n++] = 'X';
p[n++] = 'X';
p[n++] = 'X';
p[n] = 0;
free(tmp_pattern);
tmp_pattern = p;
return 0;
}
static int opentempfile(char **path)
{
int fd;
char *fname;
fname = strdup(tmp_pattern ? : "XXXXXX"); /* TODO improve the path */
if (fname == NULL)
return -1;
fd = mkostemp(fname, O_CLOEXEC|O_WRONLY);
if (fd < 0)
free(fname);
else
*path = fname;
return fd;
}
int afb_hreq_post_add_file(struct afb_hreq *hreq, const char *key, const char *file, const char *data, size_t size)
{
int fd;
ssize_t sz;
struct hreq_data *hdat = get_data(hreq, key, 1);
if (hdat->value == NULL) {
hdat->value = strdup(file);
if (hdat->value == NULL)
return 0;
fd = opentempfile(&hdat->path);
} else if (strcmp(hdat->value, file) || hdat->path == NULL) {
return 0;
} else {
fd = open(hdat->path, O_WRONLY|O_APPEND);
}
if (fd < 0)
return 0;
while (size) {
sz = write(fd, data, size);
if (sz >= 0) {
hdat->length += (size_t)sz;
size -= (size_t)sz;
data += sz;
} else if (errno != EINTR)
break;
}
close(fd);
return !size;
}
struct afb_req afb_hreq_to_req(struct afb_hreq *hreq)
{
return (struct afb_req){ .itf = &afb_hreq_req_itf, .closure = hreq };
}
static struct afb_arg req_get(struct afb_hreq *hreq, const char *name)
{
const char *value;
struct hreq_data *hdat = get_data(hreq, name, 0);
if (hdat)
return (struct afb_arg){
.name = hdat->key,
.value = hdat->value,
.path = hdat->path
};
value = MHD_lookup_connection_value(hreq->connection, MHD_GET_ARGUMENT_KIND, name);
return (struct afb_arg){
.name = value == NULL ? NULL : name,
.value = value,
.path = NULL
};
}
static int _iterargs_(struct json_object *obj, enum MHD_ValueKind kind, const char *key, const char *value)
{
json_object_object_add(obj, key, value ? json_object_new_string(value) : NULL);
return 1;
}
static struct json_object *req_json(struct afb_hreq *hreq)
{
struct hreq_data *hdat;
struct json_object *obj, *val;
obj = hreq->json;
if (obj == NULL) {
hreq->json = obj = json_object_new_object();
if (obj == NULL) {
} else {
MHD_get_connection_values (hreq->connection, MHD_GET_ARGUMENT_KIND, (void*)_iterargs_, obj);
for (hdat = hreq->data ; hdat ; hdat = hdat->next) {
if (hdat->path == NULL)
val = hdat->value ? json_object_new_string(hdat->value) : NULL;
else {
val = json_object_new_object();
if (val == NULL) {
} else {
json_object_object_add(val, "file", json_object_new_string(hdat->value));
json_object_object_add(val, "path", json_object_new_string(hdat->path));
}
}
json_object_object_add(obj, hdat->key, val);
}
}
}
return obj;
}
static const char *req_raw(struct afb_hreq *hreq, size_t *size)
{
const char *result = json_object_get_string(req_json(hreq));
*size = result ? strlen(result) : 0;
return result;
}
static void req_send(struct afb_hreq *hreq, const char *buffer, size_t size)
{
afb_hreq_reply_copy(hreq, MHD_HTTP_OK, size, buffer, NULL);
}
static ssize_t send_json_cb(json_object *obj, uint64_t pos, char *buf, size_t max)
{
ssize_t len = stpncpy(buf, json_object_to_json_string_ext(obj, JSON_C_TO_STRING_PLAIN)+pos, max) - buf;
return len ? : (ssize_t)MHD_CONTENT_READER_END_OF_STREAM;
}
static void req_reply(struct afb_hreq *hreq, unsigned retcode, const char *status, const char *info, json_object *resp)
{
struct json_object *reply;
const char *reqid;
struct MHD_Response *response;
reqid = afb_hreq_get_argument(hreq, long_key_for_reqid);
if (reqid == NULL)
reqid = afb_hreq_get_argument(hreq, short_key_for_reqid);
reply = afb_msg_json_reply(status, info, resp, &hreq->context, reqid);
response = MHD_create_response_from_callback((uint64_t)strlen(json_object_to_json_string_ext(reply, JSON_C_TO_STRING_PLAIN)), SIZE_RESPONSE_BUFFER, (void*)send_json_cb, reply, (void*)json_object_put);
afb_hreq_reply(hreq, retcode, response, NULL);
}
static void req_fail(struct afb_hreq *hreq, const char *status, const char *info)
{
req_reply(hreq, MHD_HTTP_OK, status, info, NULL);
}
static void req_success(struct afb_hreq *hreq, json_object *obj, const char *info)
{
req_reply(hreq, MHD_HTTP_OK, "success", info, obj);
}
static int req_subscribe_unsubscribe_error(struct afb_hreq *hreq, struct afb_event event)
{
errno = EINVAL;
return -1;
}
int afb_hreq_init_context(struct afb_hreq *hreq)
{
const char *uuid;
const char *token;
if (hreq->context.session != NULL)
return 0;
uuid = afb_hreq_get_header(hreq, long_key_for_uuid);
if (uuid == NULL)
uuid = afb_hreq_get_argument(hreq, long_key_for_uuid);
if (uuid == NULL)
uuid = afb_hreq_get_cookie(hreq, cookie_name);
if (uuid == NULL)
uuid = afb_hreq_get_argument(hreq, short_key_for_uuid);
token = afb_hreq_get_header(hreq, long_key_for_token);
if (token == NULL)
token = afb_hreq_get_argument(hreq, long_key_for_token);
if (token == NULL)
token = afb_hreq_get_argument(hreq, short_key_for_token);
return afb_context_connect(&hreq->context, uuid, token);
}
int afb_hreq_init_cookie(int port, const char *path, int maxage)
{
int rc;
free(cookie_name);
free(cookie_setter);
cookie_name = NULL;
cookie_setter = NULL;
path = path ? : "/";
rc = asprintf(&cookie_name, "%s-%d", long_key_for_uuid, port);
if (rc < 0)
return 0;
rc = asprintf(&cookie_setter, "%s=%%s; Path=%s; Max-Age=%d; HttpOnly",
cookie_name, path, maxage);
if (rc < 0)
return 0;
return 1;
}
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