/*
- * Copyright (C) 2015 "IoT.bzh"
+ * Copyright (C) 2015, 2016 "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.
+ * 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
*
- * 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/>.
- *
- * Reference:
- * http://stackoverflow.com/questions/25971505/how-to-delete-element-from-hsearch
+ * 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 <string.h>
#include <uuid/uuid.h>
#include <assert.h>
+#include <errno.h>
+#include <json-c/json.h>
-/*
-#include <dirent.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <search.h>
-#include <assert.h>
-*/
-
-#include "afb-apis.h"
#include "session.h"
+#include "verbose.h"
#define NOW (time(NULL))
+struct client_value
+{
+ void *value;
+ void (*free_value)(void*);
+};
+
+struct afb_event_listener_list
+{
+ struct afb_event_listener_list *next;
+ struct afb_event_listener listener;
+ int refcount;
+};
+
+struct AFB_clientCtx
+{
+ unsigned refcount;
+ time_t expiration; // expiration time of the token
+ time_t access;
+ char uuid[37]; // long term authentication of remote client
+ char token[37]; // short term authentication of remote client
+ struct client_value *values;
+ struct afb_event_listener_list *listeners;
+};
+
// Session UUID are store in a simple array [for 10 sessions this should be enough]
static struct {
pthread_mutex_t mutex; // declare a mutex to protect hash table
- AFB_clientCtx **store; // sessions store
+ struct AFB_clientCtx **store; // sessions store
int count; // current number of sessions
int max;
int timeout;
int apicount;
- const char *initok;
+ char initok[37];
+ struct afb_event_listener_list *listeners;
} sessions;
-static const char key_uuid[] = "uuid";
-static const char key_token[] = "token";
+/* generate a uuid */
+static void new_uuid(char uuid[37])
+{
+ uuid_t newuuid;
+ uuid_generate(newuuid);
+ uuid_unparse_lower(newuuid, uuid);
+}
// Free context [XXXX Should be protected again memory abort XXXX]
-static void ctxUuidFreeCB (AFB_clientCtx *client)
+static void ctxUuidFreeCB (struct AFB_clientCtx *client)
{
- int idx;
+ int idx;
- // If application add a handle let's free it now
- if (client->contexts != NULL) {
+ // If application add a handle let's free it now
+ assert (client->values != NULL);
- // Free client handle with a standard Free function, with app callback or ignore it
- for (idx=0; idx < sessions.apicount; idx ++) {
- if (client->contexts[idx] != NULL) {
- afb_apis_free_context(idx, client->contexts[idx]);
- }
- }
- }
+ // Free client handle with a standard Free function, with app callback or ignore it
+ for (idx=0; idx < sessions.apicount; idx ++)
+ ctxClientValueSet(client, idx, NULL, NULL);
}
// Create a new store in RAM, not that is too small it will be automatically extended
-void ctxStoreInit (int nbSession, int timeout, int apicount, const char *initok)
+void ctxStoreInit (int max_session_count, int timeout, const char *initok, int context_count)
{
// let's create as store as hashtable does not have any
- sessions.store = calloc (1 + (unsigned)nbSession, sizeof(AFB_clientCtx));
- sessions.max = nbSession;
+ sessions.store = calloc (1 + (unsigned)max_session_count, sizeof(struct AFB_clientCtx));
+ sessions.max = max_session_count;
sessions.timeout = timeout;
- sessions.apicount = apicount;
- if (strlen(initok) >= 37) {
- fprintf(stderr, "Error: initial token '%s' too long (max length 36)", initok);
+ sessions.apicount = context_count;
+ if (initok == NULL)
+ /* without token, a secret is made to forbid creation of sessions */
+ new_uuid(sessions.initok);
+ else if (strlen(initok) < sizeof(sessions.store[0]->token))
+ strcpy(sessions.initok, initok);
+ else {
+ ERROR("initial token '%s' too long (max length 36)", initok);
exit(1);
}
- sessions.initok = initok;
}
-static AFB_clientCtx *ctxStoreSearch (const char* uuid)
+static struct AFB_clientCtx *ctxStoreSearch (const char* uuid)
{
int idx;
- AFB_clientCtx *client;
+ struct AFB_clientCtx *client;
assert (uuid != NULL);
return client;
}
-static int ctxStoreDel (AFB_clientCtx *client)
+static int ctxStoreDel (struct AFB_clientCtx *client)
{
int idx;
int status;
for (idx=0; idx < sessions.max; idx++) {
if (sessions.store[idx] == client) {
- sessions.store[idx]=NULL;
+ sessions.store[idx] = NULL;
sessions.count--;
- ctxUuidFreeCB (client);
status = 1;
goto deleted;
}
return status;
}
-static int ctxStoreAdd (AFB_clientCtx *client)
+static int ctxStoreAdd (struct AFB_clientCtx *client)
{
int idx;
int status;
assert (client != NULL);
- //fprintf (stderr, "ctxStoreAdd request uuid=%s count=%d\n", client->uuid, sessions.count);
-
pthread_mutex_lock(&sessions.mutex);
for (idx=0; idx < sessions.max; idx++) {
if (NULL == sessions.store[idx]) {
- sessions.store[idx]= client;
+ sessions.store[idx] = client;
sessions.count++;
status = 1;
goto added;
}
// Check if context timeout or not
-static int ctxStoreTooOld (AFB_clientCtx *ctx, time_t now)
+static int ctxStoreTooOld (struct AFB_clientCtx *ctx, time_t now)
{
- return ctx->timeStamp <= now;
+ assert (ctx != NULL);
+ return ctx->expiration < now;
}
-// Loop on every entry and remove old context sessions.hash
-void ctxStoreGarbage ()
+// Check if context is active or not
+static int ctxIsActive (struct AFB_clientCtx *ctx, time_t now)
{
- AFB_clientCtx *ctx;
- long idx;
- time_t now = NOW;
+ assert (ctx != NULL);
+ return ctx->uuid[0] != 0 && ctx->expiration >= now;
+}
- // Loop on Sessions Table and remove anything that is older than timeout
- for (idx=0; idx < sessions.max; idx++) {
- ctx = sessions.store[idx];
- if (ctx != NULL && ctxStoreTooOld(ctx, now)) {
- ctxStoreDel (ctx);
- }
- }
+// Loop on every entry and remove old context sessions.hash
+static void ctxStoreCleanUp (time_t now)
+{
+ struct AFB_clientCtx *ctx;
+ long idx;
+
+ // Loop on Sessions Table and remove anything that is older than timeout
+ for (idx=0; idx < sessions.max; idx++) {
+ ctx = sessions.store[idx];
+ if (ctx != NULL && ctxStoreTooOld(ctx, now)) {
+ ctxClientClose (ctx);
+ }
+ }
}
// This function will return exiting client context or newly created client context
-AFB_clientCtx *ctxClientGet (const char *uuid)
+struct AFB_clientCtx *ctxClientGetSession (const char *uuid, int *created)
{
- uuid_t newuuid;
- AFB_clientCtx *clientCtx;
+ struct AFB_clientCtx *clientCtx;
+ time_t now;
+
+ /* cleaning */
+ now = NOW;
+ ctxStoreCleanUp (now);
/* search for an existing one not too old */
- clientCtx = uuid != NULL ? ctxStoreSearch (uuid) : NULL;
- if (clientCtx) {
- if (!ctxStoreTooOld (clientCtx, NOW))
- return clientCtx;
- ctxStoreDel (clientCtx);
- }
+ if (uuid != NULL) {
+ if (strlen(uuid) >= sizeof clientCtx->uuid) {
+ errno = EINVAL;
+ goto error;
+ }
+ clientCtx = ctxStoreSearch(uuid);
+ if (clientCtx != NULL) {
+ *created = 0;
+ goto found;
+ }
+ }
- /* mimic old behaviour */
- if (sessions.initok == NULL)
- return NULL;
+ /* returns a new one */
+ clientCtx = calloc(1, sizeof(struct AFB_clientCtx) + ((unsigned)sessions.apicount * sizeof(*clientCtx->values)));
+ if (clientCtx == NULL) {
+ errno = ENOMEM;
+ goto error;
+ }
+ clientCtx->values = (void*)(clientCtx + 1);
- /* cleanup before creating */
- if(2 * sessions.count >= sessions.max)
- ctxStoreGarbage();
+ /* generate the uuid */
+ if (uuid == NULL) {
+ new_uuid(clientCtx->uuid);
+ } else {
+ strcpy(clientCtx->uuid, uuid);
+ }
- /* returns a new one */
- clientCtx = calloc(1, sizeof(AFB_clientCtx)); // init NULL clientContext
+ /* init the token */
+ strcpy(clientCtx->token, sessions.initok);
+ clientCtx->expiration = now + sessions.timeout;
+ if (!ctxStoreAdd (clientCtx)) {
+ errno = ENOMEM;
+ goto error2;
+ }
+ *created = 1;
+
+found:
+ clientCtx->access = now;
+ clientCtx->refcount++;
+ return clientCtx;
+
+error2:
+ free(clientCtx);
+error:
+ return NULL;
+}
+
+struct AFB_clientCtx *ctxClientAddRef(struct AFB_clientCtx *clientCtx)
+{
+ if (clientCtx != NULL)
+ clientCtx->refcount++;
+ return clientCtx;
+}
+
+void ctxClientUnref(struct AFB_clientCtx *clientCtx)
+{
if (clientCtx != NULL) {
- clientCtx->contexts = calloc ((unsigned)sessions.apicount, sizeof (void*));
- if (clientCtx->contexts != NULL) {
- /* generate the uuid */
- uuid_generate(newuuid);
- uuid_unparse_lower(newuuid, clientCtx->uuid);
- clientCtx->timeStamp = time(NULL) + sessions.timeout;
- strcpy(clientCtx->token, sessions.initok);
- if (ctxStoreAdd (clientCtx))
- return clientCtx;
- free(clientCtx->contexts);
+ assert(clientCtx->refcount != 0);
+ --clientCtx->refcount;
+ if (clientCtx->refcount == 0 && clientCtx->uuid[0] == 0) {
+ ctxStoreDel (clientCtx);
+ free(clientCtx);
}
- free(clientCtx);
}
- return NULL;
}
// Free Client Session Context
-int ctxClientClose (AFB_clientCtx *clientCtx)
+void ctxClientClose (struct AFB_clientCtx *clientCtx)
{
assert(clientCtx != NULL);
- return ctxStoreDel (clientCtx);
+ if (clientCtx->uuid[0] != 0) {
+ clientCtx->uuid[0] = 0;
+ ctxUuidFreeCB (clientCtx);
+ while(clientCtx->listeners != NULL)
+ ctxClientEventListenerRemove(clientCtx, clientCtx->listeners->listener);
+ if (clientCtx->refcount == 0) {
+ ctxStoreDel (clientCtx);
+ free(clientCtx);
+ }
+ }
}
// Sample Generic Ping Debug API
-int ctxTokenCheck (AFB_clientCtx *clientCtx, const char *token)
+int ctxTokenCheck (struct AFB_clientCtx *clientCtx, const char *token)
{
assert(clientCtx != NULL);
assert(token != NULL);
// compare current token with previous one
- if (ctxStoreTooOld (clientCtx, NOW))
+ if (!ctxIsActive (clientCtx, NOW))
return 0;
- if (!clientCtx->token[0] || 0 == strcmp (token, clientCtx->token)) {
- clientCtx->timeStamp = time(NULL) + sessions.timeout;
- return 1;
- }
- // Token is not valid let move level of assurance to zero and free attached client handle
- return 0;
+ if (clientCtx->token[0] && strcmp (token, clientCtx->token) != 0)
+ return 0;
+
+ return 1;
}
// generate a new token and update client context
-int ctxTokenNew (AFB_clientCtx *clientCtx)
+void ctxTokenNew (struct AFB_clientCtx *clientCtx)
{
- uuid_t newuuid;
-
assert(clientCtx != NULL);
// Old token was valid let's regenerate a new one
- uuid_generate(newuuid); // create a new UUID
- uuid_unparse_lower(newuuid, clientCtx->token);
+ new_uuid(clientCtx->token);
// keep track of time for session timeout and further clean up
- clientCtx->timeStamp = time(NULL) + sessions.timeout;
+ clientCtx->expiration = NOW + sessions.timeout;
+}
- return 1;
+static int add_listener(struct afb_event_listener_list **head, struct afb_event_listener listener)
+{
+ struct afb_event_listener_list *iter, **prv;
+
+ prv = head;
+ for (;;) {
+ iter = *prv;
+ if (iter == NULL) {
+ iter = calloc(1, sizeof *iter);
+ if (iter == NULL) {
+ errno = ENOMEM;
+ return -1;
+ }
+ iter->listener = listener;
+ iter->refcount = 1;
+ *prv = iter;
+ return 0;
+ }
+ if (iter->listener.itf == listener.itf && iter->listener.closure == listener.closure) {
+ iter->refcount++;
+ return 0;
+ }
+ prv = &iter->next;
+ }
+}
+
+int ctxClientEventListenerAdd(struct AFB_clientCtx *clientCtx, struct afb_event_listener listener)
+{
+ return add_listener(clientCtx != NULL ? &clientCtx->listeners : &sessions.listeners, listener);
+}
+
+static void remove_listener(struct afb_event_listener_list **head, struct afb_event_listener listener)
+{
+ struct afb_event_listener_list *iter, **prv;
+
+ prv = head;
+ for (;;) {
+ iter = *prv;
+ if (iter == NULL)
+ return;
+ if (iter->listener.itf == listener.itf && iter->listener.closure == listener.closure) {
+ if (!--iter->refcount) {
+ *prv = iter->next;
+ free(iter);
+ }
+ return;
+ }
+ prv = &iter->next;
+ }
+}
+
+void ctxClientEventListenerRemove(struct AFB_clientCtx *clientCtx, struct afb_event_listener listener)
+{
+ remove_listener(clientCtx != NULL ? &clientCtx->listeners : &sessions.listeners, listener);
+}
+
+static int send(struct afb_event_listener_list *head, const char *event, struct json_object *object)
+{
+ struct afb_event_listener_list *iter;
+ int result;
+
+ result = 0;
+ iter = head;
+ while (iter != NULL) {
+ if (iter->listener.itf->expects == NULL || iter->listener.itf->expects(iter->listener.closure, event)) {
+ iter->listener.itf->send(iter->listener.closure, event, json_object_get(object));
+ result++;
+ }
+ iter = iter->next;
+ }
+
+ return result;
}
+int ctxClientEventSend(struct AFB_clientCtx *clientCtx, const char *event, struct json_object *object)
+{
+ long idx;
+ time_t now;
+ int result;
+
+ now = NOW;
+ if (clientCtx != NULL) {
+ result = ctxIsActive(clientCtx, now) ? send(clientCtx->listeners, event, object) : 0;
+ } else {
+ result = send(sessions.listeners, event, object);
+ for (idx=0; idx < sessions.max; idx++) {
+ clientCtx = ctxClientAddRef(sessions.store[idx]);
+ if (clientCtx != NULL && ctxIsActive(clientCtx, now)) {
+ clientCtx = ctxClientAddRef(clientCtx);
+ result += send(clientCtx->listeners, event, object);
+ }
+ ctxClientUnref(clientCtx);
+ }
+ }
+ return result;
+}
+
+const char *ctxClientGetUuid (struct AFB_clientCtx *clientCtx)
+{
+ assert(clientCtx != NULL);
+ return clientCtx->uuid;
+}
+
+const char *ctxClientGetToken (struct AFB_clientCtx *clientCtx)
+{
+ assert(clientCtx != NULL);
+ return clientCtx->token;
+}
+
+void *ctxClientValueGet(struct AFB_clientCtx *clientCtx, int index)
+{
+ assert(clientCtx != NULL);
+ assert(index >= 0);
+ assert(index < sessions.apicount);
+ return clientCtx->values[index].value;
+}
+
+void ctxClientValueSet(struct AFB_clientCtx *clientCtx, int index, void *value, void (*free_value)(void*))
+{
+ struct client_value prev;
+ assert(clientCtx != NULL);
+ assert(index >= 0);
+ assert(index < sessions.apicount);
+ prev = clientCtx->values[index];
+ clientCtx->values[index] = (struct client_value){.value = value, .free_value = free_value};
+ if (prev.value != NULL && prev.free_value != NULL)
+ prev.free_value(prev.value);
+}
Code Review / src / app-framework-binder.git / blobdiff