X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fsession.c;h=9944e764935d723b0bdb49a65a031493c886c4db;hb=c94e1ef88adc641ebbab57377b97f8a7b6a70d1b;hp=ad411239e391dad8952be9401a1ec98938d04d1c;hpb=bbe18a624f4961165cf52d7f4c25de6f3a7ec012;p=src%2Fapp-framework-binder.git

diff --git a/src/session.c b/src/session.c
index ad411239..9944e764 100644
--- a/src/session.c
+++ b/src/session.c
@@ -1,23 +1,18 @@
 /*
- * 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
@@ -28,72 +23,108 @@
 #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 cookie
+{
+	struct cookie *next;
+	const void *key;
+	void *value;
+	void (*free_value)(void*);
+};
+
+struct AFB_clientCtx
+{
+	unsigned refcount;
+	unsigned loa;
+	int timeout;
+	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 cookie *cookies;
+};
+
 // 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];
 } 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;
-
-    // If application add a handle let's free it now
-    if (client->contexts != 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]);
-            }
-        }
-    }
+	int idx;
+	struct cookie *cookie;
+
+	// 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 ++)
+		ctxClientValueSet(client, idx, NULL, NULL);
+
+	// free cookies
+	cookie = client->cookies;
+	while (cookie != NULL) {
+		client->cookies = cookie->next;
+		if (cookie->value != NULL && cookie->free_value != NULL)
+			cookie->free_value(cookie->value);
+		free(cookie);
+		cookie = client->cookies;
+	}
 }
 
 // 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);
 
@@ -111,7 +142,7 @@ found:
     return client;
 }
 
-static int ctxStoreDel (AFB_clientCtx *client)
+static int ctxStoreDel (struct AFB_clientCtx *client)
 {
     int idx;
     int status;
@@ -122,9 +153,8 @@ static int ctxStoreDel (AFB_clientCtx *client)
 
     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;
 	}
@@ -135,20 +165,18 @@ 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;
@@ -161,107 +189,272 @@ 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;
+}
+
+// Check if context is active or not
+static int ctxIsActive (struct AFB_clientCtx *ctx, time_t now)
+{
+    assert (ctx != NULL);
+    return ctx->uuid[0] != 0 && ctx->expiration >= now;
 }
 
 // Loop on every entry and remove old context sessions.hash
-void ctxStoreGarbage ()
+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);
+		}
+	}
+}
+
+static struct AFB_clientCtx *new_context (const char *uuid, int timeout, time_t now)
 {
-    AFB_clientCtx *ctx;
-    long idx;
-    time_t now = NOW;
+	struct AFB_clientCtx *clientCtx;
 
-    // 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);
-        }
-    }
+	/* allocates 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);
+
+	/* generate the uuid */
+	if (uuid == NULL) {
+		new_uuid(clientCtx->uuid);
+	} else {
+		if (strlen(uuid) >= sizeof clientCtx->uuid) {
+			errno = EINVAL;
+			goto error2;
+		}
+		strcpy(clientCtx->uuid, uuid);
+	}
+
+	/* init the token */
+	strcpy(clientCtx->token, sessions.initok);
+	clientCtx->timeout = timeout;
+	if (timeout != 0)
+		clientCtx->expiration = now + timeout;
+	else {
+		clientCtx->expiration = (time_t)(~(time_t)0);
+		if (clientCtx->expiration < 0)
+			clientCtx->expiration = (time_t)(((unsigned long long)clientCtx->expiration) >> 1);
+	}
+	if (!ctxStoreAdd (clientCtx)) {
+		errno = ENOMEM;
+		goto error2;
+	}
+
+	clientCtx->access = now;
+	clientCtx->refcount = 1;
+	return clientCtx;
+
+error2:
+	free(clientCtx);
+error:
+	return NULL;
 }
 
-// This function will return exiting client context or newly created client context
-AFB_clientCtx *ctxClientGet (const char *uuid)
+struct AFB_clientCtx *ctxClientCreate (const char *uuid, int timeout)
 {
-	uuid_t newuuid;
-	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);
-        }
-
-	/* mimic old behaviour */
-	if (sessions.initok == NULL)
+	if (uuid != NULL && ctxStoreSearch(uuid) != NULL) {
+		errno = EEXIST;
 		return NULL;
+	}
+
+	return new_context(uuid, timeout, now);
+}
+
+// This function will return exiting client context or newly created client context
+struct AFB_clientCtx *ctxClientGetSession (const char *uuid, int *created)
+{
+	struct AFB_clientCtx *clientCtx;
+	time_t now;
+
+	/* cleaning */
+	now = NOW;
+	ctxStoreCleanUp (now);
+
+	/* search for an existing one not too old */
+	if (uuid != NULL) {
+		clientCtx = ctxStoreSearch(uuid);
+		if (clientCtx != NULL) {
+			*created = 0;
+			clientCtx->access = now;
+			clientCtx->refcount++;
+			return clientCtx;
+		}
+	}
 
-    	/* cleanup before creating */
-	if(2 * sessions.count >= sessions.max)
-		ctxStoreGarbage();
+	*created = 1;
+	return new_context(uuid, sessions.timeout, now);
+}
+
+struct AFB_clientCtx *ctxClientAddRef(struct AFB_clientCtx *clientCtx)
+{
+	if (clientCtx != NULL)
+		clientCtx->refcount++;
+	return clientCtx;
+}
 
-	/* returns a new one */
-        clientCtx = calloc(1, sizeof(AFB_clientCtx)); // init NULL clientContext
+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);
+       		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;
+	if (clientCtx->timeout != 0)
+		clientCtx->expiration = NOW + clientCtx->timeout;
+}
 
-	return 1;
+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;
+}
+
+unsigned ctxClientGetLOA (struct AFB_clientCtx *clientCtx)
+{
+	assert(clientCtx != NULL);
+	return clientCtx->loa;
+}
+
+void ctxClientSetLOA (struct AFB_clientCtx *clientCtx, unsigned loa)
+{
+	assert(clientCtx != NULL);
+	clientCtx->loa = loa;
+}
+
+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.value != value && prev.free_value != NULL)
+		prev.free_value(prev.value);
+}
+
+void *ctxClientCookieGet(struct AFB_clientCtx *clientCtx, const void *key)
+{
+	struct cookie *cookie;
+
+	cookie = clientCtx->cookies;
+	while(cookie != NULL) {
+		if (cookie->key == key)
+			return cookie->value;
+		cookie = cookie->next;
+	}
+	return NULL;
+}
+
+int ctxClientCookieSet(struct AFB_clientCtx *clientCtx, const void *key, void *value, void (*free_value)(void*))
+{
+	struct cookie *cookie;
+
+	/* search for a replacement */
+	cookie = clientCtx->cookies;
+	while(cookie != NULL) {
+		if (cookie->key == key) {
+			if (cookie->value != NULL && cookie->value != value && cookie->free_value != NULL)
+				cookie->free_value(cookie->value);
+			cookie->value = value;
+			cookie->free_value = free_value;
+			return 0;
+		}
+		cookie = cookie->next;
+	}
+
+	/* allocates */
+	cookie = malloc(sizeof *cookie);
+	if (cookie == NULL) {
+		errno = ENOMEM;
+		return -1;
+	}
+
+	cookie->key = key;
+	cookie->value = value;
+	cookie->free_value = free_value;
+	cookie->next = clientCtx->cookies;
+	clientCtx->cookies = cookie;
+	return 0;
 }