/**
* Originates a new publication - sends it to all clients subscribed.
* @param publish pointer to a stucture which contains all the publication information
* @param originator the originating client
*/
void Protocol_processPublication(Publish* publish, char* originator)
{
Messages* stored = NULL; /* to avoid duplication of data where possible */
List* clients;
ListElement* current = NULL;
int savedMsgId = publish->msgId;
int clean_needed = 0;
FUNC_ENTRY;
if (Topics_hasWildcards(publish->topic))
{
Log(LOG_INFO, 12, NULL, publish->topic, originator);
goto exit;
}
if ((strcmp(INTERNAL_CLIENTID, originator) != 0) && bstate->password_file && bstate->acl_file)
{
Clients* client = (Clients*)(TreeFindIndex(bstate->clients, originator, 1)->content);
if (Users_authorise(client->user, publish->topic, ACL_WRITE) == false)
{
Log(LOG_AUDIT, 149, NULL, originator, publish->topic);
goto exit;
}
}
if (publish->header.bits.retain)
{
SubscriptionEngines_setRetained(bstate->se, publish->topic, publish->header.bits.qos, publish->payload, publish->payloadlen);
if (bstate->persistence == 1 && bstate->autosave_on_changes == 1 && bstate->autosave_interval > 0
&& bstate->se->retained_changes >= bstate->autosave_interval)
{
Log(LOG_INFO, 100, NULL, bstate->autosave_interval);
SubscriptionEngines_save(bstate->se);
}
}
clients = SubscriptionEngines_getSubscribers(bstate->se, publish->topic, originator);
if (strncmp(publish->topic, "$SYS/client/", 12) == 0)
{ /* default subscription for a client */
Node* node = TreeFindIndex(bstate->clients, &publish->topic[12], 1);
if (node == NULL)
node = TreeFind(bstate->disconnected_clients, &publish->topic[12]);
if (node && node->content)
{
Subscriptions* rcs = malloc(sizeof(Subscriptions));
rcs->clientName = &publish->topic[12];
rcs->qos = 2;
rcs->priority = PRIORITY_NORMAL;
rcs->topicName = publish->topic;
ListAppend(clients, rcs, sizeof(Subscriptions));
}
}
current = NULL;
while (ListNextElement(clients, ¤t))
{
Node* curnode = NULL;
unsigned int qos = ((Subscriptions*)(current->content))->qos;
int priority = ((Subscriptions*)(current->content))->priority;
char* clientName = ((Subscriptions*)(current->content))->clientName;
if (publish->header.bits.qos < qos) /* reduce qos if > subscribed qos */
qos = publish->header.bits.qos;
if ((curnode = TreeFindIndex(bstate->clients, clientName, 1)) == NULL)
curnode = TreeFind(bstate->disconnected_clients, clientName);
#if defined(MQTTS)
if (curnode == NULL && ((curnode = TreeFindIndex(bstate->mqtts_clients, clientName, 1)) == NULL))
curnode = TreeFind(bstate->disconnected_mqtts_clients, clientName);
#endif
if (curnode)
{
Clients* pubclient = (Clients*)(curnode->content);
int retained = 0;
Messages* saved = NULL;
char* original_topic = publish->topic;
#if !defined(NO_BRIDGE)
if (pubclient->outbound || pubclient->noLocal)
{
retained = publish->header.bits.retain; /* outbound and noLocal mean outward/inward bridge client,
so keep retained flag */
if (pubclient->outbound)
{
Bridge_handleOutbound(pubclient, publish);
if (publish->topic != original_topic)
{ /* handleOutbound has changed the topic, so we musn't used the stored pub which
contains the original topic */
saved = stored;
stored = NULL;
}
}
}
#endif
if (Protocol_startOrQueuePublish(pubclient, publish, qos, retained, priority, &stored) == SOCKET_ERROR)
{
pubclient->good = pubclient->connected = 0; /* flag this client as needing to be cleaned up */
clean_needed = 1;
}
if (publish->topic != original_topic)
{
stored = saved; /* restore the stored pointer for the next loop iteration */
free(publish->topic);
publish->topic = original_topic;
}
}
}
publish->msgId = savedMsgId;
/* INTERNAL_CLIENTID means that we are publishing data to the log,
and we don't want to interfere with other close processing */
if (clean_needed && strcmp(originator, INTERNAL_CLIENTID) != 0)
MQTTProtocol_clean_clients(bstate->clients);
ListFree(clients);
exit:
FUNC_EXIT;
}
/**
* Process an incoming ping subscribe packet for a socket
* @param pack pointer to the subscribe packet
* @param sock the socket on which the packet was received
* @return completion code
*/
int MQTTProtocol_handleSubscribes(void* pack, int sock, Clients* client)
{
int i, *aq, *isnew, *authorized;
Subscribe* subscribe = (Subscribe*)pack;
ListElement *curtopic = NULL, *curqos = NULL;
int rc = TCPSOCKET_COMPLETE;
#if !defined(SINGLE_LISTENER)
Listener* listener = Socket_getParentListener(sock);
#endif
FUNC_ENTRY;
if (Protocol_isClientQuiescing(client))
goto exit; /* don't accept new work */
Log(LOG_PROTOCOL, 6, NULL, sock, client->clientID, subscribe->msgId);
aq = malloc(sizeof(int)*(subscribe->noTopics));
isnew = malloc(sizeof(int)*(subscribe->noTopics));
authorized = malloc(sizeof(int)*(subscribe->noTopics));
for (i = 0; i < subscribe->noTopics; ++i)
{
int j;
ListElement *duptopic = NULL;
ListNextElement(subscribe->topics, &curtopic);
aq[i] = *(int*)(ListNextElement(subscribe->qoss, &curqos)->content);
/* The mount_point topic transformation must be done before the topic syntax validity check
* otherwise badly formed topics can get into the subscription engine.
*/
#if !defined(SINGLE_LISTENER)
if (listener && listener->mount_point)
{
char* temp = malloc(strlen((char*)(curtopic->content)) + strlen(listener->mount_point) + 1);
strcpy(temp, listener->mount_point);
strcat(temp, (char*)(curtopic->content));
free((char*)(curtopic->content));
curtopic->content = temp;
subscribe->topics->size += strlen(listener->mount_point);
}
#endif
if (!Topics_isValidName((char*)curtopic->content))
{
Log(LOG_WARNING, 153, NULL, (char*)curtopic->content, client->clientID, client->addr);
free(curtopic->content);
continue;
}
authorized[i] = true;
if (bstate->password_file && bstate->acl_file)
{
authorized[i] = Users_authorise(client->user,(char*)(curtopic->content),ACL_READ);
if (!authorized[i])
Log(LOG_AUDIT, 150, NULL, client->clientID, (char*)(curtopic->content));
}
for (j = 0; j < i; ++j)
{
char* prevtopic = (char*)(ListNextElement(subscribe->topics, &duptopic)->content);
if (strcmp(prevtopic, (char*)(curtopic->content)) == 0)
duptopic->content = curtopic->content;
}
isnew[i] = SubscriptionEngines_subscribe(bstate->se, client->clientID,
(char*)(curtopic->content), aq[i], client->noLocal, (client->cleansession == 0), PRIORITY_NORMAL);
}
/* send suback before sending the retained publications because a lot of retained publications could fill up the socket buffer */
if ((rc = MQTTPacket_send_suback(subscribe->msgId, subscribe->noTopics, aq, sock, client->clientID)) != SOCKET_ERROR)
{
curtopic = curqos = NULL;
for (i = 0; i < subscribe->noTopics; ++i)
{
/* careful if you get >1 subscriptions using the same topic name in the same packet! */
/* The next line changes the semantics of subscribe for bridge connections,
* so that retained messages are only sent for new subscriptions. This is to help
* avoid "retained message storms" when a connection drops and is re-established.
* This change could be applied to all subscriptions by removing the "noLocal" check. */
if (authorized[i] && ((client->noLocal == 0) || isnew[i]))
MQTTProtocol_processRetaineds(client, (char*)(ListNextElement(subscribe->topics, &curtopic)->content),
*(int*)(ListNextElement(subscribe->qoss, &curqos)->content), PRIORITY_NORMAL);
}
}
free(aq);
free(isnew);
free(authorized);
exit:
MQTTPacket_freeSubscribe(subscribe, 0);
FUNC_EXIT_RC(rc);
return rc;
}