X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fsession.c;h=9504fdbe71835e4eca7c007b6fa8282bc1bec2cf;hb=520bbafb30ce49b94b7825ff553d8cb5bda6d612;hp=2bb5b4423047a85f390f2d83fe53e7bcecd32f00;hpb=cd054544444e92e7695dd288f0c04b7af0f668e3;p=src%2Fapp-framework-binder.git

diff --git a/src/session.c b/src/session.c
index 2bb5b442..9504fdbe 100644
--- a/src/session.c
+++ b/src/session.c
@@ -14,6 +14,10 @@
  *
  * 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
+ *
  */
 
 
@@ -23,280 +27,301 @@
 #include <time.h>
 #include <sys/stat.h>
 #include <sys/types.h>
+#include <pthread.h>
+#include <search.h>
+
+#include "afb-apis.h"
+#include "session.h"
+
+// 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
+  int count;                      // current number of sessions
+  int max;
+} sessions;
+
+static const char key_uuid[] = "uuid";
+static const char key_token[] = "token";
+
+// Free context [XXXX Should be protected again memory abort XXXX]
+static void ctxUuidFreeCB (AFB_clientCtx *client)
+{
+    int idx, cnt;
+
+    // If application add a handle let's free it now
+    if (client->contexts != NULL) {
+
+	cnt = afb_apis_count();
+        // Free client handle with a standard Free function, with app callback or ignore it
+        for (idx=0; idx < cnt; idx ++) {
+            if (client->contexts[idx] != NULL) {
+		afb_apis_free_context(idx, client->contexts[idx]);
+            }
+        }
+    }
+}
+
+// Create a new store in RAM, not that is too small it will be automatically extended
+void ctxStoreInit (int nbSession)
+{
 
-#define AFB_SESSION_JTYPE "AFB_session"
-#define AFB_SESSION_JLIST "AFB_sessions"
-#define AFB_SESSION_JINFO "AFB_infos"
+   // let's create as store as hashtable does not have any
+   sessions.store = calloc (1 + (unsigned)nbSession, sizeof(AFB_clientCtx));
+   sessions.max = nbSession;
+}
 
-#define AFB_CURRENT_SESSION "active-session"  // file link name within sndcard dir
-#define AFB_DEFAULT_SESSION "current-session" // should be in sync with UI
+static AFB_clientCtx *ctxStoreSearch (const char* uuid)
+{
+    int  idx;
+    AFB_clientCtx *client;
 
+    if (uuid == NULL)
+	return NULL;
 
+    pthread_mutex_lock(&sessions.mutex);
 
+    for (idx=0; idx < sessions.max; idx++) {
+        if (sessions.store[idx] && (0 == strcmp (uuid, sessions.store[idx]->uuid))) break;
+    }
 
-// verify we can read/write in session dir
-PUBLIC AFB_ERROR sessionCheckdir (AFB_session *session) {
+    if (idx == sessions.max) client=NULL;
+    else client= sessions.store[idx];
+    pthread_mutex_unlock(&sessions.mutex);
 
-   int err;
+    return client;
+}
 
-   // in case session dir would not exist create one
-   if (verbose) fprintf (stderr, "AFB:notice checking session dir [%s]\n", session->config->sessiondir);
-   mkdir(session->config->sessiondir, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
+static AFB_error ctxStoreDel (AFB_clientCtx *client)
+{
+    int idx;
+    int status;
 
-   // change for session directory
-   err = chdir(session->config->sessiondir);
-   if (err) {
-     fprintf(stderr,"AFB: Fail to chdir to %s error=%s\n", session->config->sessiondir, strerror(err));
-     return err;
-   }
+    if (client == NULL)
+	return AFB_FAIL;
 
-   // verify we can write session in directory
-   json_object *dummy= json_object_new_object();
-   json_object_object_add (dummy, "checked"  , json_object_new_int (getppid()));
-   err = json_object_to_file ("./AFB-probe.json", dummy);
-   if (err < 0) return err;
+    pthread_mutex_lock(&sessions.mutex);
 
-   return AFB_SUCCESS;
-}
+    for (idx=0; idx < sessions.max; idx++) {
+        if (sessions.store[idx] && (0 == strcmp (client->uuid, sessions.store[idx]->uuid))) break;
+    }
 
-// let's return only sessions files
-STATIC int fileSelect (const struct dirent *entry) {
-   return (strstr (entry->d_name, ".afb") != NULL);
+    if (idx == sessions.max)
+	status = AFB_FAIL;
+    else {
+        sessions.count--;
+        ctxUuidFreeCB (sessions.store[idx]);
+        sessions.store[idx]=NULL;
+        status = AFB_SUCCESS;
+    }
+
+    pthread_mutex_unlock(&sessions.mutex);
+    return status;
 }
 
-STATIC  json_object *checkCardDirExit (AFB_session *session, AFB_request *request ) {
-    int  sessionDir, cardDir;
+static AFB_error ctxStoreAdd (AFB_clientCtx *client)
+{
+    int idx;
+    int status;
+    if (client == NULL)
+	return AFB_FAIL;
 
-    // card name should be more than 3 character long !!!!
-    if (strlen (request->plugin) < 3) {
-       return (jsonNewMessage (AFB_FAIL,"Fail invalid plugin=%s", request->plugin));
-    }
+    //fprintf (stderr, "ctxStoreAdd request uuid=%s count=%d\n", client->uuid, sessions.count);
 
-    // open session directory
-    sessionDir = open (session->config->sessiondir, O_DIRECTORY);
-    if (sessionDir < 0) {
-          return (jsonNewMessage (AFB_FAIL,"Fail to open directory [%s] error=%s", session->config->sessiondir, strerror(sessionDir)));
+    pthread_mutex_lock(&sessions.mutex);
+
+    for (idx=0; idx < sessions.max; idx++) {
+        if (NULL == sessions.store[idx]) break;
     }
 
-   // create session sndcard directory if it does not exit
-    cardDir = openat (sessionDir, request->plugin,  O_DIRECTORY);
-    if (cardDir < 0) {
-          cardDir  = mkdirat (sessionDir, request->plugin, O_RDWR | S_IRWXU | S_IRGRP);
-          if (cardDir < 0) {
-              return (jsonNewMessage (AFB_FAIL,"Fail to create directory [%s/%s] error=%s", session->config->sessiondir, request->plugin, strerror(cardDir)));
-          }
+    if (idx == sessions.max) status=AFB_FAIL;
+    else {
+        status=AFB_SUCCESS;
+        sessions.count ++;
+        sessions.store[idx]= client;
     }
-    close (sessionDir);
-    return NULL;
+
+    pthread_mutex_unlock(&sessions.mutex);
+    return status;
 }
 
-// create a session in current directory
-PUBLIC json_object *sessionList (AFB_session *session, AFB_request *request) {
-    json_object *sessionsJ, *ajgResponse;
-    struct stat fstat;
-    struct dirent **namelist;
-    int  count, sessionDir;
-
-    // if directory for card's sessions does not exist create it
-    ajgResponse = checkCardDirExit (session, request);
-    if (ajgResponse != NULL) return ajgResponse;
-
-    // open session directory
-    sessionDir = open (session->config->sessiondir, O_DIRECTORY);
-    if (sessionDir < 0) {
-          return (jsonNewMessage (AFB_FAIL,"Fail to open directory [%s] error=%s", session->config->sessiondir, strerror(sessionDir)));
-    }
+// Check if context timeout or not
+static int ctxStoreTooOld (AFB_clientCtx *ctx, int timeout)
+{
+    int res;
+    time_t now =  time(NULL);
+    res = (ctx->timeStamp + timeout) <= now;
+    return res;
+}
 
-    count = scandirat (sessionDir, request->plugin, &namelist, fileSelect, alphasort);
-    close (sessionDir);
+// Loop on every entry and remove old context sessions.hash
+void ctxStoreGarbage (const int timeout)
+{
+    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, timeout))) {
+            ctxStoreDel (ctx);
+        }
+    }
+}
 
-    if (count < 0) {
-        return (jsonNewMessage (AFB_FAIL,"Fail to scan sessions directory [%s/%s] error=%s", session->config->sessiondir, request->plugin, strerror(sessionDir)));
+// This function will return exiting client context or newly created client context
+AFB_clientCtx *ctxClientGet (AFB_request *request)
+{
+  AFB_clientCtx *clientCtx=NULL;
+  const char *uuid;
+  uuid_t newuuid;
+
+    if (request->config->token == NULL) return NULL;
+
+    // Check if client as a context or not inside the URL
+    uuid  = MHD_lookup_connection_value(request->connection, MHD_GET_ARGUMENT_KIND, key_uuid);
+
+    // if UUID in query we're restfull with no cookies otherwise check for cookie
+    if (uuid != NULL)
+        request->restfull = TRUE;
+    else {
+        char cookie[64];
+        request->restfull = FALSE;
+        snprintf(cookie, sizeof cookie, "%s-%d", COOKIE_NAME, request->config->httpdPort);
+        uuid = MHD_lookup_connection_value (request->connection, MHD_COOKIE_KIND, cookie);
+    };
+
+    // Warning when no cookie defined MHD_lookup_connection_value may return something !!!
+    if ((uuid != NULL) && (strnlen (uuid, 10) >= 10))   {
+        // search if client context exist and it not timeout let's use it
+        clientCtx = ctxStoreSearch (uuid);
+
+	if (clientCtx) {
+            if (ctxStoreTooOld (clientCtx, request->config->cntxTimeout)) {
+                 // this session is too old let's delete it
+                ctxStoreDel (clientCtx);
+                clientCtx = NULL;
+            } else {
+                return clientCtx;
+            }
+        }
     }
-    if (count == 0) return (jsonNewMessage (AFB_EMPTY,"[%s] no session at [%s]", request->plugin, session->config->sessiondir));
-
-    // loop on each session file, retrieve its date and push it into json response object
-    sessionsJ = json_object_new_array();
-    while (count--) {
-         json_object *sessioninfo;
-         char timestamp [64];
-         char *filename;
-
-         // extract file name and last modification date
-         filename = namelist[count]->d_name;
-         printf("%s\n", filename);
-         stat(filename,&fstat);
-         strftime (timestamp, sizeof(timestamp), "%c", localtime (&fstat.st_mtime));
-         filename[strlen(filename)-4] = '\0'; // remove .afb extension from filename
-
-         // create an object by session with last update date
-         sessioninfo = json_object_new_object();
-         json_object_object_add (sessioninfo, "date" , json_object_new_string (timestamp));
-         json_object_object_add (sessioninfo, "session" , json_object_new_string (filename));
-         json_object_array_add (sessionsJ, sessioninfo);
-
-         free(namelist[count]);
+
+    // we have no session let's create one otherwise let's clean any exiting values
+    if (clientCtx == NULL) {
+        clientCtx = calloc(1, sizeof(AFB_clientCtx)); // init NULL clientContext
+        clientCtx->contexts = calloc ((unsigned)afb_apis_count(), sizeof (void*));
     }
 
-    // free scandir structure
-    free(namelist);
+    uuid_generate(newuuid);         // create a new UUID
+    uuid_unparse_lower(newuuid, clientCtx->uuid);
 
-    // everything is OK let's build final response
-    ajgResponse = json_object_new_object();
-    json_object_object_add (ajgResponse, "jtype" , json_object_new_string (AFB_SESSION_JLIST));
-    json_object_object_add (ajgResponse, "status"  , jsonNewStatus(AFB_SUCCESS));
-    json_object_object_add (ajgResponse, "data"    , sessionsJ);
+    // if table is full at 50% let's clean it up
+    if(sessions.count > (sessions.max / 2)) ctxStoreGarbage(request->config->cntxTimeout);
 
-    return (ajgResponse);
+    // finally add uuid into hashtable
+    if (AFB_SUCCESS != ctxStoreAdd (clientCtx)) {
+        free (clientCtx);
+        return NULL;
+    }
+    return clientCtx;
 }
 
-// Create a link toward last used sessionname within sndcard directory
-STATIC void makeSessionLink (const char *cardname, const char *sessionname) {
-   char linkname [256], filename [256];
-   int err;
-   // create a link to keep track of last uploaded sessionname for this card
-   strncpy (filename, sessionname, sizeof(filename));
-   strncat (filename, ".afb", sizeof(filename));
-
-   strncpy (linkname, cardname, sizeof(linkname));
-   strncat (linkname, "/", sizeof(filename));
-   strncat (linkname, AFB_CURRENT_SESSION, sizeof(linkname));
-   strncat (linkname, ".afb", sizeof(filename));
-   unlink (linkname); // remove previous link if any
-   err = symlink (filename, linkname);
-   if (err < 0) fprintf (stderr, "Fail to create link %s->%s error=%s\n", linkname, filename, strerror(errno));
-}
+// Sample Generic Ping Debug API
+AFB_error ctxTokenCheck (AFB_clientCtx *clientCtx, AFB_request *request)
+{
+    const char *token;
+
+    if (clientCtx->contexts == NULL)
+	return AFB_EMPTY;
+
+    // this time have to extract token from query list
+    token = MHD_lookup_connection_value(request->connection, MHD_GET_ARGUMENT_KIND, key_token);
 
-// Load Json session object from disk
-PUBLIC json_object *sessionFromDisk (AFB_session *session, AFB_request *request, char *name) {
-    json_object *jsonSession, *jtype, *response;
-    const char *ajglabel;
-    char filename [256];
-    int defsession;
+    // if not token is providing we refuse the exchange
+    if ((token == NULL) || (clientCtx->token == NULL))
+	return AFB_FALSE;
 
-    if (name == NULL) {
-        return  (jsonNewMessage (AFB_FATAL,"session name missing &session=MySessionName"));
+    // compare current token with previous one
+    if ((0 == strcmp (token, clientCtx->token)) && (!ctxStoreTooOld (clientCtx, request->config->cntxTimeout))) {
+       return AFB_SUCCESS;
     }
 
-    // check for current session request
-    defsession = (strcmp (name, AFB_DEFAULT_SESSION) ==0);
+    // Token is not valid let move level of assurance to zero and free attached client handle
+    return AFB_FAIL;
+}
 
-    // if directory for card's sessions does not exist create it
-    response = checkCardDirExit (session, request);
-    if (response != NULL) return response;
+// Free Client Session Context
+AFB_error ctxTokenReset (AFB_clientCtx *clientCtx, AFB_request *request)
+{
+    if (clientCtx == NULL)
+       return AFB_EMPTY;
+    //if (verbose) fprintf (stderr, "ctxClientReset New uuid=[%s] token=[%s] timestamp=%d\n", clientCtx->uuid, clientCtx->token, clientCtx->timeStamp);
 
-    // add name and file extension to session name
-    strncpy (filename, request->plugin, sizeof(filename));
-    strncat (filename, "/", sizeof(filename));
-    if (defsession) strncat (filename, AFB_CURRENT_SESSION, sizeof(filename)-1);
-    else strncat (filename, name, sizeof(filename)-1);
-    strncat (filename, ".afb", sizeof(filename));
+    // Search for an existing client with the same UUID
+    clientCtx = ctxStoreSearch (clientCtx->uuid);
+    if (clientCtx == NULL)
+       return AFB_FALSE;
 
-    // just upload json object and return without any further processing
-    jsonSession = json_object_from_file (filename);
+    // Remove client from table
+    ctxStoreDel (clientCtx);
 
-    if (jsonSession == NULL)  return (jsonNewMessage (AFB_EMPTY,"File [%s] not found", filename));
+    return AFB_SUCCESS;
+}
 
-    // verify that file is a JSON ALSA session type
-    if (!json_object_object_get_ex (jsonSession, "jtype", &jtype)) {
-        json_object_put   (jsonSession);
-        return  (jsonNewMessage (AFB_EMPTY,"File [%s] 'jtype' descriptor not found", filename));
-    }
+// generate a new token
+AFB_error ctxTokenCreate (AFB_clientCtx *clientCtx, AFB_request *request)
+{
+    uuid_t newuuid;
+    const char *token;
+
+    if (clientCtx == NULL)
+       return AFB_EMPTY;
+
+    // if config->token!="" then verify that we have the right initial share secret
+    if (request->config->token[0] != '\0') {
 
-    // check type value is AFB_SESSION_JTYPE
-    ajglabel = json_object_get_string (jtype);
-    if (strcmp (AFB_SESSION_JTYPE, ajglabel)) {
-       json_object_put   (jsonSession);
-       return  (jsonNewMessage (AFB_FATAL,"File [%s] jtype=[%s] != [%s]", filename, ajglabel, AFB_SESSION_JTYPE));
+        // check for initial token secret and return if not presented
+        token = MHD_lookup_connection_value(request->connection, MHD_GET_ARGUMENT_KIND, key_token);
+        if (token == NULL)
+           return AFB_UNAUTH;
+
+        // verify that it fits with initial tokens fit
+        if (strcmp(request->config->token, token))
+           return AFB_UNAUTH;
     }
 
-    // create a link to keep track of last uploaded session for this card
-    if (!defsession) makeSessionLink (request->plugin, name);
+    // create a UUID as token value
+    uuid_generate(newuuid);
+    uuid_unparse_lower(newuuid, clientCtx->token);
+
+    // keep track of time for session timeout and further clean up
+    clientCtx->timeStamp=time(NULL);
 
-    return (jsonSession);
+    // Token is also store in context but it might be convenient for plugin to access it directly
+    return AFB_SUCCESS;
 }
 
-// push Json session object to disk
-PUBLIC json_object * sessionToDisk (AFB_session *session, AFB_request *request, char *name, json_object *jsonSession) {
-   char filename [256];
-   time_t rawtime;
-   struct tm * timeinfo;
-   int err, defsession;
-   static json_object *response;
-
-   // we should have a session name
-   if (name == NULL) return (jsonNewMessage (AFB_FATAL,"session name missing &session=MySessionName"));
-
-   // check for current session request
-   defsession = (strcmp (name, AFB_DEFAULT_SESSION) ==0);
-
-   // if directory for card's sessions does not exist create it
-   response = checkCardDirExit (session, request);
-   if (response != NULL) return response;
-
-   // add cardname and file extension to session name
-   strncpy (filename, request->plugin, sizeof(filename));
-   strncat (filename, "/", sizeof(filename));
-   if (defsession) strncat (filename, AFB_CURRENT_SESSION, sizeof(filename)-1);
-   else strncat (filename, name, sizeof(filename)-1);
-   strncat (filename, ".afb", sizeof(filename)-1);
-
-
-   json_object_object_add(jsonSession, "jtype", json_object_new_string (AFB_SESSION_JTYPE));
-
-   // add a timestamp and store session on disk
-   time ( &rawtime );  timeinfo = localtime ( &rawtime );
-   // A copy of the string is made and the memory is managed by the json_object
-   json_object_object_add (jsonSession, "timestamp", json_object_new_string (asctime (timeinfo)));
-
-
-   // do we have extra session info ?
-   if (request->post) {
-       static json_object *info, *jtype;
-       const char  *ajglabel;
-
-       // extract session info from args
-       info = json_tokener_parse (request->post);
-       if (!info) {
-            response = jsonNewMessage (AFB_FATAL,"sndcard=%s session=%s invalid json args=%s", request->plugin, name, request->post);
-            goto OnErrorExit;
-       }
-
-       // info is a valid AFB_info type
-       if (!json_object_object_get_ex (info, "jtype", &jtype)) {
-            response = jsonNewMessage (AFB_EMPTY,"sndcard=%s session=%s No 'AFB_type' args=%s", request->plugin, name, request->post);
-            goto OnErrorExit;
-       }
-
-       // check type value is AFB_INFO_JTYPE
-       ajglabel = json_object_get_string (jtype);
-       if (strcmp (AFB_SESSION_JINFO, ajglabel)) {
-              json_object_put   (info); // release info json object
-              response = jsonNewMessage (AFB_FATAL,"File [%s] jtype=[%s] != [%s] data=%s", filename, ajglabel, AFB_SESSION_JTYPE, request->post);
-              goto OnErrorExit;
-       }
-
-       // this is valid info data for our session
-       json_object_object_add (jsonSession, "info", info);
-   }
-
-   // Finally save session on disk
-   err = json_object_to_file (filename, jsonSession);
-   if (err < 0) {
-        response = jsonNewMessage (AFB_FATAL,"Fail save session = [%s] to disk", filename);
-        goto OnErrorExit;
-   }
-
-
-   // create a link to keep track of last uploaded session for this card
-   if (!defsession) makeSessionLink (request->plugin, name);
-
-   // we're donne let's return status message
-   response = jsonNewMessage (AFB_SUCCESS,"Session= [%s] saved on disk", filename);
-   json_object_put (jsonSession);
-   return (response);
-
-OnErrorExit:
-   json_object_put (jsonSession);
-   return response;
+
+// generate a new token and update client context
+AFB_error ctxTokenRefresh (AFB_clientCtx *clientCtx, AFB_request *request)
+{
+    uuid_t newuuid;
+
+    if (clientCtx == NULL)
+        return AFB_EMPTY;
+
+    // Check if the old token is valid
+    if (ctxTokenCheck (clientCtx, request) != AFB_SUCCESS)
+        return AFB_FAIL;
+
+    // Old token was valid let's regenerate a new one
+    uuid_generate(newuuid);         // create a new UUID
+    uuid_unparse_lower(newuuid, clientCtx->token);
+
+    // keep track of time for session timeout and further clean up
+    clientCtx->timeStamp=time(NULL);
+
+    return AFB_SUCCESS;
 }
+