/**
* MQTT retry protocol and socket pending writes processing.
* @param now current time
* @param doRetry boolean - retries as well as pending writes?
* @param regardless boolean - retry packets regardless of retry interval (used on reconnect)
*/
void MQTTProtocol_retry(time_t now, int doRetry, int regardless)
{
ListElement* current = NULL;
FUNC_ENTRY;
ListNextElement(bstate->clients, ¤t);
/* look through the outbound message list of each client, checking to see if a retry is necessary */
while (current)
{
Clients* client = (Clients*)(current->content);
ListNextElement(bstate->clients, ¤t);
if (client->connected == 0)
continue;
if (client->good == 0)
{
MQTTProtocol_closeSession(client, 1);
continue;
}
if (Socket_noPendingWrites(client->net.socket) == 0)
continue;
if (doRetry)
MQTTProtocol_retries(now, client, regardless);
}
FUNC_EXIT;
}
/**
* MQTT retry protocol and socket pending writes processing.
* @param now current time
* @param doRetry boolean - retries as well as pending writes?
* @return not actually used
*/
int MQTTProtocol_retry(time_t now, int doRetry)
{
Node* current = NULL;
int rc = 0;
FUNC_ENTRY;
current = TreeNextElement(bstate->clients, current);
/* look through the outbound message list of each client, checking to see if a retry is necessary */
while (current)
{
Clients* client = (Clients*)(current->content);
current = TreeNextElement(bstate->clients, current);
if (client->connected == 0)
{
#if defined(MQTTS)
if (client->protocol == PROTOCOL_MQTTS)
{
if (difftime(now,client->lastContact) > bstate->retry_interval)
{
int rc2 = 0;
/* NB: no dup bit for these packets */
if (client->connect_state == 1) /* TODO: handle err */
rc2 = MQTTSPacket_send_willTopicReq(client);
else if (client->connect_state == 2) /* TODO: handle err */
rc2 = MQTTSPacket_send_willMsgReq(client);
if (rc2 == SOCKET_ERROR)
{
client->good = 0;
Log(LOG_WARNING, 29, NULL, client->clientID, client->socket);
MQTTProtocol_closeSession(client, 1);
client = NULL;
}
}
}
#endif
continue;
}
if (client->good == 0)
{
MQTTProtocol_closeSession(client, 1);
continue;
}
if (Socket_noPendingWrites(client->socket) == 0)
continue;
if (doRetry)
MQTTProtocol_retries(now, client);
if (client)
{
if (MQTTProtocol_processQueued(client))
rc = 1;
}
}
FUNC_EXIT_RC(rc);
return rc;
}
/**
* Process an incoming connect packet for a socket
* @param pack pointer to the connect packet
* @param sock the socket on which the packet was received
* @return completion code
*/
int MQTTProtocol_handleConnects(void* pack, int sock, Clients* client)
{
Connect* connect = (Connect*)pack;
Node* elem = NULL;
int terminate = 0;
int rc = TCPSOCKET_COMPLETE;
#if !defined(SINGLE_LISTENER)
Listener* listener = Socket_getParentListener(sock);
#endif
FUNC_ENTRY;
Log(LOG_PROTOCOL, 26, NULL, sock, connect->clientID);/*
connect->Protocol, connect->flags.bits.cleanstart, connect->keepAliveTimer,
connect->version, connect->username, connect->password);*/
Socket_removeNew(sock);
if (bstate->state != BROKER_RUNNING)
terminate = 1; /* don't accept new connection requests when we are shutting down */
/* Now check the version. If we don't recognize it we will not have parsed the packet,
* so nothing else in the packet structure will have been filled in.
*/
else if (!MQTTPacket_checkVersion(pack))
{
Log(LOG_WARNING, 32, NULL, connect->Protocol, connect->version);
rc = MQTTPacket_send_connack(CONNACK_UNACCEPTABLE_PROTOCOL_VERSION, sock, Socket_getpeer(sock)); /* send response */
terminate = 1;
}
else if (connect->clientID[0] == '\0' || (connect->version == 3 && strlen(connect->clientID) > 23))
{
rc = MQTTPacket_send_connack(CONNACK_IDENTIFIER_REJECTED, sock, Socket_getpeer(sock)); /* send response */
terminate = 1;
}
else if (bstate->password_file != NULL)
{
if (connect->flags.bits.username && connect->flags.bits.password &&
(Users_authenticate(connect->username, connect->password) == false))
{
Log(LOG_WARNING, 31, NULL, connect->clientID);
rc = MQTTPacket_send_connack(CONNACK_BAD_USERNAME_OR_PASSWORD, sock, connect->clientID); /* send bad user/pass response */
terminate = 1;
}
else if ((!connect->flags.bits.username || !connect->flags.bits.password) && !bstate->allow_anonymous)
{
Log(LOG_WARNING, 31, NULL, connect->clientID);
rc = MQTTPacket_send_connack(CONNACK_BROKER_UNAVAILABLE, sock, connect->clientID); /* send broker unavailable response */
terminate = 1;
}
}
if (terminate)
;
else if (bstate->clientid_prefixes->count > 0 &&
!ListFindItem(bstate->clientid_prefixes, connect->clientID, clientPrefixCompare))
{
Log(LOG_WARNING, 31, NULL, connect->clientID);
terminate = 1;
}
else
{
#if !defined(SINGLE_LISTENER)
if (listener->max_connections > -1 &&
listener->connections->count > listener->max_connections)
{
Log(LOG_WARNING, 141, NULL, connect->clientID, listener->max_connections, listener->port);
#else
if (bstate->max_connections > -1 &&
MQTTProtocol_getNoConnectedClients() >= bstate->max_connections)
{
Log(LOG_WARNING, 141, NULL, connect->clientID, bstate->max_connections, bstate->port);
#endif
rc = MQTTPacket_send_connack(CONNACK_BROKER_UNAVAILABLE, sock, connect->clientID); /* send response */
terminate = 1;
}
}
if (terminate)
{
MQTTPacket_freeConnect(connect);
Socket_close(sock);
rc = TCPSOCKET_COMPLETE;
goto exit;
}
if (bstate->connection_messages)
Log(LOG_INFO,
#if !defined(SINGLE_LISTENER)
33, NULL, listener->port, connect->clientID, Socket_getpeer(sock));
#else
33, NULL, bstate->port, connect->clientID, Socket_getpeer(sock));
#endif
elem = TreeFindIndex(bstate->clients, connect->clientID, 1);
if (elem == NULL)
{
client = TreeRemoveKey(bstate->disconnected_clients, connect->clientID);
if (client == NULL)
{
int i;
char* tmpAddr = NULL;
client = malloc(sizeof(Clients));
memset(client, '\0', sizeof(Clients));
tmpAddr = Socket_getpeer(sock);
client->addr = malloc(strlen(tmpAddr)+1);
strcpy(client->addr, tmpAddr);
#if defined(MQTTS)
client->protocol = PROTOCOL_MQTT;
#endif
client->clientID = connect->clientID;
client->outboundMsgs = ListInitialize();
client->inboundMsgs = ListInitialize();
for (i = 0; i < PRIORITY_MAX; ++i)
client->queuedMsgs[i] = ListInitialize();
connect->clientID = NULL; /* don't want to free this space as it is being used in the client structure */
}
client->socket = sock;
TreeAdd(bstate->clients, client, sizeof(Clients) + strlen(client->clientID)+1 + 3*sizeof(List));
}
else
{
client = (Clients*)(elem->content);
if (client->connected)
{
Log(LOG_INFO, 34, NULL, connect->clientID, Socket_getpeer(sock));
if (client->socket != sock)
Socket_close(client->socket);
}
if (connect->flags.bits.cleanstart)
{
int i;
/* empty pending message lists */
MQTTProtocol_emptyMessageList(client->outboundMsgs);
MQTTProtocol_emptyMessageList(client->inboundMsgs);
for (i = 0; i < PRIORITY_MAX; ++i)
MQTTProtocol_emptyMessageList(client->queuedMsgs[i]);
client->msgID = client->outbound = client->ping_outstanding = 0;
}
/* have to remove and re-add client so it is in the right order for new socket */
if (client->socket != sock)
{
TreeRemoveNodeIndex(bstate->clients, elem, 1);
TreeRemoveKeyIndex(bstate->clients, &client->socket, 0);
client->socket = sock;
TreeAdd(bstate->clients, client, sizeof(Clients) + strlen(client->clientID)+1 + 3*sizeof(List));
}
}
client->good = client->connected = 1;
client->cleansession = connect->flags.bits.cleanstart;
client->keepAliveInterval = connect->keepAliveTimer;
client->noLocal = (connect->version == PRIVATE_PROTOCOL_VERSION) ? 1 : 0;
if (client->cleansession)
MQTTProtocol_removeAllSubscriptions(client->clientID); /* clear any persistent subscriptions */
#if !defined(SINGLE_LISTENER)
if (listener && listener->mount_point && connect->flags.bits.will)
{
char* temp = malloc(strlen(connect->willTopic) + strlen(listener->mount_point) + 1);
strcpy(temp, listener->mount_point);
strcat(temp, connect->willTopic);
free(connect->willTopic);
connect->willTopic = temp;
}
#endif
#if defined(MQTTS)
if (connect->flags.bits.will)
{
MQTTProtocol_setWillTopic(client, connect->willTopic,
connect->flags.bits.willRetain, connect->flags.bits.willQoS);
MQTTProtocol_setWillMsg(client, connect->willMsg);
connect->willTopic = NULL;
connect->willMsg = NULL;
}
#else
MQTTProtocol_setWill(connect, client);
#endif
if (connect->flags.bits.username)
{
client->user = Users_get_user(connect->username);
}
rc = MQTTPacket_send_connack(CONNACK_CONNECTION_ACCEPTED, sock, client->clientID); /* send response */
if (client->cleansession == 0)
{
ListElement* outcurrent = NULL;
time_t now = 0;
/* ensure that inflight messages are retried now by setting the last touched time
* to very old (0) before calling the retry function
*/
time(&(now));
while (ListNextElement(client->outboundMsgs, &outcurrent))
{
Messages* m = (Messages*)(outcurrent->content);
m->lastTouch = 0;
}
MQTTProtocol_retries(now, client);
MQTTProtocol_processQueued(client);
}
time(&(client->lastContact));
MQTTPacket_freeConnect(connect);
exit:
FUNC_EXIT_RC(rc);
return rc;
}
/**
* Process an incoming ping request packet for a socket
* @param pack pointer to the publish packet
* @param sock the socket on which the packet was received
* @return completion code
*/
int MQTTProtocol_handlePingreqs(void* pack, int sock, Clients* client)
{
int rc = TCPSOCKET_COMPLETE;
FUNC_ENTRY;
Log(LOG_PROTOCOL, 3, NULL, sock, client->clientID);
rc = MQTTPacket_send_pingresp(sock, client->clientID);
FUNC_EXIT_RC(rc);
return rc;
}
