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MQTTClient.c
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/*******************************************************************************
* Copyright (c) 2009, 2023 IBM Corp., Ian Craggs and others
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* and Eclipse Distribution License v1.0 which accompany this distribution.
*
* The Eclipse Public License is available at
* https://www.eclipse.org/legal/epl-2.0/
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Ian Craggs - initial API and implementation and/or initial documentation
* Ian Craggs - bug 384016 - segv setting will message
* Ian Craggs - bug 384053 - v1.0.0.7 - stop MQTTClient_receive on socket error
* Ian Craggs, Allan Stockdill-Mander - add ability to connect with SSL
* Ian Craggs - multiple server connection support
* Ian Craggs - fix for bug 413429 - connectionLost not called
* Ian Craggs - fix for bug 421103 - trying to write to same socket, in publish/retries
* Ian Craggs - fix for bug 419233 - mutexes not reporting errors
* Ian Craggs - fix for bug 420851
* Ian Craggs - fix for bug 432903 - queue persistence
* Ian Craggs - MQTT 3.1.1 support
* Ian Craggs - fix for bug 438176 - MQTT version selection
* Rong Xiang, Ian Craggs - C++ compatibility
* Ian Craggs - fix for bug 443724 - stack corruption
* Ian Craggs - fix for bug 447672 - simultaneous access to socket structure
* Ian Craggs - fix for bug 459791 - deadlock in WaitForCompletion for bad client
* Ian Craggs - fix for bug 474905 - insufficient synchronization for subscribe, unsubscribe, connect
* Ian Craggs - make it clear that yield and receive are not intended for multi-threaded mode (bug 474748)
* Ian Craggs - SNI support, message queue unpersist bug
* Ian Craggs - binary will message support
* Ian Craggs - waitforCompletion fix #240
* Ian Craggs - check for NULL SSL options #334
* Ian Craggs - allocate username/password buffers #431
* Ian Craggs - MQTT 5.0 support
* Sven Gambel - add generic proxy support
*******************************************************************************/
/**
* @file
* \brief Synchronous API implementation
*
*/
#include <stdlib.h>
#include <string.h>
#if !defined(_WIN32) && !defined(_WIN64)
#include <sys/time.h>
#else
#if defined(_MSC_VER) && _MSC_VER < 1900
#define snprintf _snprintf
#endif
#endif
#include "MQTTClient.h"
#if !defined(NO_PERSISTENCE)
#include "MQTTPersistence.h"
#endif
#include "utf-8.h"
#include "MQTTProtocol.h"
#include "MQTTProtocolOut.h"
#include "Thread.h"
#include "SocketBuffer.h"
#include "StackTrace.h"
#include "Heap.h"
#if defined(OPENSSL)
#include <openssl/ssl.h>
#else
#define URI_SSL "ssl://"
#define URI_MQTTS "mqtts://"
#endif
#include "OsWrapper.h"
#define URI_TCP "tcp://"
#define URI_MQTT "mqtt://"
#define URI_WS "ws://"
#define URI_WSS "wss://"
#include "VersionInfo.h"
#include "WebSocket.h"
#include "Proxy.h"
const char *client_timestamp_eye = "MQTTClientV3_Timestamp " BUILD_TIMESTAMP;
const char *client_version_eye = "MQTTClientV3_Version " CLIENT_VERSION;
struct conlost_sync_data {
sem_type sem;
void *m;
};
int MQTTClient_init(void);
void MQTTClient_global_init(MQTTClient_init_options* inits)
{
MQTTClient_init();
#if defined(OPENSSL)
SSLSocket_handleOpensslInit(inits->do_openssl_init);
#endif
}
static ClientStates ClientState =
{
CLIENT_VERSION, /* version */
NULL /* client list */
};
ClientStates* bstate = &ClientState;
MQTTProtocol state;
#if defined(_WIN32) || defined(_WIN64)
static mutex_type mqttclient_mutex = NULL;
mutex_type socket_mutex = NULL;
static mutex_type subscribe_mutex = NULL;
static mutex_type connect_mutex = NULL;
#if !defined(NO_HEAP_TRACKING)
extern mutex_type stack_mutex;
extern mutex_type heap_mutex;
#endif
extern mutex_type log_mutex;
int MQTTClient_init(void)
{
DWORD rc = 0;
if (mqttclient_mutex == NULL)
{
if ((mqttclient_mutex = CreateMutex(NULL, 0, NULL)) == NULL)
{
rc = GetLastError();
printf("mqttclient_mutex error %d\n", rc);
goto exit;
}
if ((subscribe_mutex = CreateMutex(NULL, 0, NULL)) == NULL)
{
rc = GetLastError();
printf("subscribe_mutex error %d\n", rc);
goto exit;
}
if ((connect_mutex = CreateMutex(NULL, 0, NULL)) == NULL)
{
rc = GetLastError();
printf("connect_mutex error %d\n", rc);
goto exit;
}
#if !defined(NO_HEAP_TRACKING)
if ((stack_mutex = CreateMutex(NULL, 0, NULL)) == NULL)
{
rc = GetLastError();
printf("stack_mutex error %d\n", rc);
goto exit;
}
if ((heap_mutex = CreateMutex(NULL, 0, NULL)) == NULL)
{
rc = GetLastError();
printf("heap_mutex error %d\n", rc);
goto exit;
}
#endif
if ((log_mutex = CreateMutex(NULL, 0, NULL)) == NULL)
{
rc = GetLastError();
printf("log_mutex error %d\n", rc);
goto exit;
}
if ((socket_mutex = CreateMutex(NULL, 0, NULL)) == NULL)
{
rc = GetLastError();
printf("socket_mutex error %d\n", rc);
goto exit;
}
}
exit:
return rc;
}
void MQTTClient_cleanup(void)
{
if (connect_mutex)
CloseHandle(connect_mutex);
if (subscribe_mutex)
CloseHandle(subscribe_mutex);
#if !defined(NO_HEAP_TRACKING)
if (stack_mutex)
CloseHandle(stack_mutex);
if (heap_mutex)
CloseHandle(heap_mutex);
#endif
if (log_mutex)
CloseHandle(log_mutex);
if (socket_mutex)
CloseHandle(socket_mutex);
if (mqttclient_mutex)
CloseHandle(mqttclient_mutex);
}
#if defined(PAHO_MQTT_STATIC)
/* Global variable for one-time initialization structure */
static INIT_ONCE g_InitOnce = INIT_ONCE_STATIC_INIT; /* Static initialization */
/* One time initialization function */
BOOL CALLBACK InitOnceFunction (
PINIT_ONCE InitOnce, /* Pointer to one-time initialization structure */
PVOID Parameter, /* Optional parameter passed by InitOnceExecuteOnce */
PVOID *lpContext) /* Receives pointer to event object */
{
int rc = MQTTClient_init();
return rc == 0;
}
#else
BOOL APIENTRY DllMain(HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
MQTTClient_init();
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
case DLL_PROCESS_DETACH:
if (lpReserved)
MQTTClient_cleanup();
break;
}
return TRUE;
}
#endif
#else
static pthread_mutex_t mqttclient_mutex_store = PTHREAD_MUTEX_INITIALIZER;
static mutex_type mqttclient_mutex = &mqttclient_mutex_store;
static pthread_mutex_t socket_mutex_store = PTHREAD_MUTEX_INITIALIZER;
mutex_type socket_mutex = &socket_mutex_store;
static pthread_mutex_t subscribe_mutex_store = PTHREAD_MUTEX_INITIALIZER;
static mutex_type subscribe_mutex = &subscribe_mutex_store;
static pthread_mutex_t connect_mutex_store = PTHREAD_MUTEX_INITIALIZER;
static mutex_type connect_mutex = &connect_mutex_store;
int MQTTClient_init(void)
{
pthread_mutexattr_t attr;
int rc;
pthread_mutexattr_init(&attr);
#if !defined(_WRS_KERNEL)
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
#else
/* #warning "no pthread_mutexattr_settype" */
#endif /* !defined(_WRS_KERNEL) */
if ((rc = pthread_mutex_init(mqttclient_mutex, &attr)) != 0)
printf("MQTTClient: error %d initializing client_mutex\n", rc);
else if ((rc = pthread_mutex_init(socket_mutex, &attr)) != 0)
printf("MQTTClient: error %d initializing socket_mutex\n", rc);
else if ((rc = pthread_mutex_init(subscribe_mutex, &attr)) != 0)
printf("MQTTClient: error %d initializing subscribe_mutex\n", rc);
else if ((rc = pthread_mutex_init(connect_mutex, &attr)) != 0)
printf("MQTTClient: error %d initializing connect_mutex\n", rc);
return rc;
}
#define WINAPI
#endif
static volatile int library_initialized = 0;
static List* handles = NULL;
static int running = 0;
static int tostop = 0;
static thread_id_type run_id = 0;
typedef struct
{
MQTTClient_message* msg;
char* topicName;
int topicLen;
unsigned int seqno; /* only used on restore */
} qEntry;
typedef struct
{
char* serverURI;
const char* currentServerURI; /* when using HA options, set the currently used serverURI */
#if defined(OPENSSL)
int ssl;
#endif
int websocket;
Clients* c;
MQTTClient_connectionLost* cl;
MQTTClient_messageArrived* ma;
MQTTClient_deliveryComplete* dc;
void* context;
MQTTClient_disconnected* disconnected;
void* disconnected_context; /* the context to be associated with the disconnected callback*/
MQTTClient_published* published;
void* published_context; /* the context to be associated with the disconnected callback*/
#if 0
MQTTClient_authHandle* auth_handle;
void* auth_handle_context; /* the context to be associated with the authHandle callback*/
#endif
sem_type connect_sem;
int rc; /* getsockopt return code in connect */
sem_type connack_sem;
sem_type suback_sem;
sem_type unsuback_sem;
MQTTPacket* pack;
unsigned long commandTimeout;
} MQTTClients;
struct props_rc_parms
{
MQTTClients* m;
MQTTProperties* properties;
enum MQTTReasonCodes reasonCode;
};
static void MQTTClient_terminate(void);
static void MQTTClient_emptyMessageQueue(Clients* client);
static int MQTTClient_deliverMessage(
int rc, MQTTClients* m,
char** topicName, int* topicLen,
MQTTClient_message** message);
static int clientSockCompare(void* a, void* b);
static thread_return_type WINAPI connectionLost_call(void* context);
static thread_return_type WINAPI MQTTClient_run(void* n);
static int MQTTClient_stop(void);
static void MQTTClient_closeSession(Clients* client, enum MQTTReasonCodes reason, MQTTProperties* props);
static int MQTTClient_cleanSession(Clients* client);
static MQTTResponse MQTTClient_connectURIVersion(
MQTTClient handle, MQTTClient_connectOptions* options,
const char* serverURI, int MQTTVersion,
START_TIME_TYPE start, ELAPSED_TIME_TYPE millisecsTimeout,
MQTTProperties* connectProperties, MQTTProperties* willProperties);
static MQTTResponse MQTTClient_connectURI(MQTTClient handle, MQTTClient_connectOptions* options, const char* serverURI,
MQTTProperties* connectProperties, MQTTProperties* willProperties);
static int MQTTClient_disconnect1(MQTTClient handle, int timeout, int internal, int stop, enum MQTTReasonCodes, MQTTProperties*);
static int MQTTClient_disconnect_internal(MQTTClient handle, int timeout);
static void MQTTClient_retry(void);
static MQTTPacket* MQTTClient_cycle(SOCKET* sock, ELAPSED_TIME_TYPE timeout, int* rc);
static MQTTPacket* MQTTClient_waitfor(MQTTClient handle, int packet_type, int* rc, int64_t timeout);
/*static int pubCompare(void* a, void* b); */
static void MQTTProtocol_checkPendingWrites(void);
static void MQTTClient_writeComplete(SOCKET socket, int rc);
static void MQTTClient_writeContinue(SOCKET socket);
int MQTTClient_createWithOptions(MQTTClient* handle, const char* serverURI, const char* clientId,
int persistence_type, void* persistence_context, MQTTClient_createOptions* options)
{
int rc = 0;
MQTTClients *m = NULL;
#if (defined(_WIN32) || defined(_WIN64)) && defined(PAHO_MQTT_STATIC)
/* intializes mutexes once. Must come before FUNC_ENTRY */
BOOL bStatus = InitOnceExecuteOnce(&g_InitOnce, InitOnceFunction, NULL, NULL);
#endif
FUNC_ENTRY;
if ((rc = Paho_thread_lock_mutex(mqttclient_mutex)) != 0)
goto nounlock_exit;
if (serverURI == NULL || clientId == NULL)
{
rc = MQTTCLIENT_NULL_PARAMETER;
goto exit;
}
if (!UTF8_validateString(clientId))
{
rc = MQTTCLIENT_BAD_UTF8_STRING;
goto exit;
}
if (strlen(clientId) == 0 && persistence_type == MQTTCLIENT_PERSISTENCE_DEFAULT)
{
rc = MQTTCLIENT_PERSISTENCE_ERROR;
goto exit;
}
if (strstr(serverURI, "://") != NULL)
{
if (strncmp(URI_TCP, serverURI, strlen(URI_TCP)) != 0
&& strncmp(URI_MQTT, serverURI, strlen(URI_MQTT)) != 0
&& strncmp(URI_WS, serverURI, strlen(URI_WS)) != 0
#if defined(OPENSSL)
&& strncmp(URI_SSL, serverURI, strlen(URI_SSL)) != 0
&& strncmp(URI_MQTTS, serverURI, strlen(URI_MQTTS)) != 0
&& strncmp(URI_WSS, serverURI, strlen(URI_WSS)) != 0
#endif
)
{
rc = MQTTCLIENT_BAD_PROTOCOL;
goto exit;
}
}
if (options && (strncmp(options->struct_id, "MQCO", 4) != 0 || options->struct_version != 0))
{
rc = MQTTCLIENT_BAD_STRUCTURE;
goto exit;
}
if (!library_initialized)
{
#if !defined(NO_HEAP_TRACKING)
Heap_initialize();
#endif
Log_initialize((Log_nameValue*)MQTTClient_getVersionInfo());
bstate->clients = ListInitialize();
Socket_outInitialize();
Socket_setWriteCompleteCallback(MQTTClient_writeComplete);
Socket_setWriteContinueCallback(MQTTClient_writeContinue);
Socket_setWriteAvailableCallback(MQTTProtocol_writeAvailable);
handles = ListInitialize();
#if defined(OPENSSL)
SSLSocket_initialize();
#endif
library_initialized = 1;
}
if ((m = malloc(sizeof(MQTTClients))) == NULL)
{
rc = PAHO_MEMORY_ERROR;
goto exit;
}
*handle = m;
memset(m, '\0', sizeof(MQTTClients));
m->commandTimeout = 10000L;
if (strncmp(URI_TCP, serverURI, strlen(URI_TCP)) == 0)
serverURI += strlen(URI_TCP);
else if (strncmp(URI_MQTT, serverURI, strlen(URI_MQTT)) == 0)
serverURI += strlen(URI_MQTT);
else if (strncmp(URI_WS, serverURI, strlen(URI_WS)) == 0)
{
serverURI += strlen(URI_WS);
m->websocket = 1;
}
else if (strncmp(URI_SSL, serverURI, strlen(URI_SSL)) == 0)
{
#if defined(OPENSSL)
serverURI += strlen(URI_SSL);
m->ssl = 1;
#else
rc = MQTTCLIENT_SSL_NOT_SUPPORTED;
goto exit;
#endif
}
else if (strncmp(URI_MQTTS, serverURI, strlen(URI_MQTTS)) == 0)
{
#if defined(OPENSSL)
serverURI += strlen(URI_MQTTS);
m->ssl = 1;
#else
rc = MQTTCLIENT_SSL_NOT_SUPPORTED;
goto exit;
#endif
}
else if (strncmp(URI_WSS, serverURI, strlen(URI_WSS)) == 0)
{
#if defined(OPENSSL)
serverURI += strlen(URI_WSS);
m->ssl = 1;
m->websocket = 1;
#else
rc = MQTTCLIENT_SSL_NOT_SUPPORTED;
goto exit;
#endif
}
m->serverURI = MQTTStrdup(serverURI);
ListAppend(handles, m, sizeof(MQTTClients));
if ((m->c = malloc(sizeof(Clients))) == NULL)
{
ListRemove(handles, m);
rc = PAHO_MEMORY_ERROR;
goto exit;
}
memset(m->c, '\0', sizeof(Clients));
m->c->context = m;
m->c->MQTTVersion = (options) ? options->MQTTVersion : MQTTVERSION_DEFAULT;
m->c->outboundMsgs = ListInitialize();
m->c->inboundMsgs = ListInitialize();
m->c->messageQueue = ListInitialize();
m->c->outboundQueue = ListInitialize();
m->c->clientID = MQTTStrdup(clientId);
m->connect_sem = Thread_create_sem(&rc);
m->connack_sem = Thread_create_sem(&rc);
m->suback_sem = Thread_create_sem(&rc);
m->unsuback_sem = Thread_create_sem(&rc);
#if !defined(NO_PERSISTENCE)
rc = MQTTPersistence_create(&(m->c->persistence), persistence_type, persistence_context);
if (rc == 0)
{
rc = MQTTPersistence_initialize(m->c, m->serverURI);
if (rc == 0)
MQTTPersistence_restoreMessageQueue(m->c);
}
#endif
ListAppend(bstate->clients, m->c, sizeof(Clients) + 3*sizeof(List));
exit:
Paho_thread_unlock_mutex(mqttclient_mutex);
nounlock_exit:
FUNC_EXIT_RC(rc);
return rc;
}
int MQTTClient_create(MQTTClient* handle, const char* serverURI, const char* clientId,
int persistence_type, void* persistence_context)
{
return MQTTClient_createWithOptions(handle, serverURI, clientId, persistence_type,
persistence_context, NULL);
}
static void MQTTClient_terminate(void)
{
FUNC_ENTRY;
MQTTClient_stop();
if (library_initialized)
{
ListFree(bstate->clients);
ListFree(handles);
handles = NULL;
WebSocket_terminate();
#if !defined(NO_HEAP_TRACKING)
Heap_terminate();
#endif
Log_terminate();
library_initialized = 0;
}
FUNC_EXIT;
}
static void MQTTClient_emptyMessageQueue(Clients* client)
{
FUNC_ENTRY;
/* empty message queue */
if (client->messageQueue->count > 0)
{
ListElement* current = NULL;
while (ListNextElement(client->messageQueue, ¤t))
{
qEntry* qe = (qEntry*)(current->content);
free(qe->topicName);
MQTTProperties_free(&qe->msg->properties);
free(qe->msg->payload);
free(qe->msg);
}
ListEmpty(client->messageQueue);
}
FUNC_EXIT;
}
void MQTTClient_destroy(MQTTClient* handle)
{
MQTTClients* m = *handle;
FUNC_ENTRY;
Paho_thread_lock_mutex(connect_mutex);
Paho_thread_lock_mutex(mqttclient_mutex);
if (m == NULL)
goto exit;
if (m->c)
{
SOCKET saved_socket = m->c->net.socket;
char* saved_clientid = MQTTStrdup(m->c->clientID);
#if !defined(NO_PERSISTENCE)
MQTTPersistence_close(m->c);
#endif
MQTTClient_emptyMessageQueue(m->c);
MQTTProtocol_freeClient(m->c);
if (!ListRemove(bstate->clients, m->c))
Log(LOG_ERROR, 0, NULL);
else
Log(TRACE_MIN, 1, NULL, saved_clientid, saved_socket);
free(saved_clientid);
}
if (m->serverURI)
free(m->serverURI);
Thread_destroy_sem(m->connect_sem);
Thread_destroy_sem(m->connack_sem);
Thread_destroy_sem(m->suback_sem);
Thread_destroy_sem(m->unsuback_sem);
if (!ListRemove(handles, m))
Log(LOG_ERROR, -1, "free error");
*handle = NULL;
if (bstate->clients->count == 0)
MQTTClient_terminate();
exit:
Paho_thread_unlock_mutex(mqttclient_mutex);
Paho_thread_unlock_mutex(connect_mutex);
FUNC_EXIT;
}
void MQTTClient_freeMessage(MQTTClient_message** message)
{
FUNC_ENTRY;
MQTTProperties_free(&(*message)->properties);
free((*message)->payload);
free(*message);
*message = NULL;
FUNC_EXIT;
}
void MQTTClient_free(void* memory)
{
FUNC_ENTRY;
free(memory);
FUNC_EXIT;
}
void* MQTTClient_malloc(size_t size)
{
void* val;
int rc = 0;
FUNC_ENTRY;
val = malloc(size);
rc = (val != NULL);
FUNC_EXIT_RC(rc);
return val;
}
void MQTTResponse_free(MQTTResponse response)
{
FUNC_ENTRY;
if (response.reasonCodeCount > 0 && response.reasonCodes)
free(response.reasonCodes);
if (response.properties)
{
MQTTProperties_free(response.properties);
free(response.properties);
}
FUNC_EXIT;
}
static int MQTTClient_deliverMessage(int rc, MQTTClients* m, char** topicName, int* topicLen, MQTTClient_message** message)
{
qEntry* qe = (qEntry*)(m->c->messageQueue->first->content);
FUNC_ENTRY;
*message = qe->msg;
*topicName = qe->topicName;
*topicLen = qe->topicLen;
if (strlen(*topicName) != *topicLen)
rc = MQTTCLIENT_TOPICNAME_TRUNCATED;
#if !defined(NO_PERSISTENCE)
if (m->c->persistence)
MQTTPersistence_unpersistQueueEntry(m->c, (MQTTPersistence_qEntry*)qe);
#endif
ListRemove(m->c->messageQueue, m->c->messageQueue->first->content);
FUNC_EXIT_RC(rc);
return rc;
}
/**
* List callback function for comparing clients by socket
* @param a first integer value
* @param b second integer value
* @return boolean indicating whether a and b are equal
*/
static int clientSockCompare(void* a, void* b)
{
MQTTClients* m = (MQTTClients*)a;
return m->c->net.socket == *(int*)b;
}
/**
* Wrapper function to call connection lost on a separate thread. A separate thread is needed to allow the
* connectionLost function to make API calls (e.g. connect)
* @param context a pointer to the relevant client
* @return thread_return_type standard thread return value - not used here
*/
static thread_return_type WINAPI connectionLost_call(void* context)
{
struct conlost_sync_data *data = (struct conlost_sync_data *)context;
MQTTClients* m = (MQTTClients *)data->m;
(*(m->cl))(m->context, NULL);
Thread_post_sem(data->sem);
return 0;
}
int MQTTClient_setDisconnected(MQTTClient handle, void* context, MQTTClient_disconnected* disconnected)
{
int rc = MQTTCLIENT_SUCCESS;
MQTTClients* m = handle;
FUNC_ENTRY;
Paho_thread_lock_mutex(mqttclient_mutex);
if (m == NULL || m->c->connect_state != NOT_IN_PROGRESS)
rc = MQTTCLIENT_FAILURE;
else
{
m->disconnected_context = context;
m->disconnected = disconnected;
}
Paho_thread_unlock_mutex(mqttclient_mutex);
FUNC_EXIT_RC(rc);
return rc;
}
/**
* Wrapper function to call disconnected on a separate thread. A separate thread is needed to allow the
* disconnected function to make API calls (e.g. connect)
* @param context a pointer to the relevant client
* @return thread_return_type standard thread return value - not used here
*/
static thread_return_type WINAPI call_disconnected(void* context)
{
struct props_rc_parms* pr = (struct props_rc_parms*)context;
(*(pr->m->disconnected))(pr->m->disconnected_context, pr->properties, pr->reasonCode);
MQTTProperties_free(pr->properties);
free(pr->properties);
free(pr);
return 0;
}
int MQTTClient_setPublished(MQTTClient handle, void* context, MQTTClient_published* published)
{
int rc = MQTTCLIENT_SUCCESS;
MQTTClients* m = handle;
FUNC_ENTRY;
Paho_thread_lock_mutex(mqttclient_mutex);
if (m == NULL || m->c->connect_state != NOT_IN_PROGRESS)
rc = MQTTCLIENT_FAILURE;
else
{
m->published_context = context;
m->published = published;
}
Paho_thread_unlock_mutex(mqttclient_mutex);
FUNC_EXIT_RC(rc);
return rc;
}
#if 0
int MQTTClient_setHandleAuth(MQTTClient handle, void* context, MQTTClient_handleAuth* auth_handle)
{
int rc = MQTTCLIENT_SUCCESS;
MQTTClients* m = handle;
FUNC_ENTRY;
Paho_thread_lock_mutex(mqttclient_mutex);
if (m == NULL || m->c->connect_state != NOT_IN_PROGRESS)
rc = MQTTCLIENT_FAILURE;
else
{
m->auth_handle_context = context;
m->auth_handle = auth_handle;
}
Paho_thread_unlock_mutex(mqttclient_mutex);
FUNC_EXIT_RC(rc);
return rc;
}
/**
* Wrapper function to call authHandle on a separate thread. A separate thread is needed to allow the
* disconnected function to make API calls (e.g. MQTTClient_auth)
* @param context a pointer to the relevant client
* @return thread_return_type standard thread return value - not used here
*/
static thread_return_type WINAPI call_auth_handle(void* context)
{
struct props_rc_parms* pr = (struct props_rc_parms*)context;
(*(pr->m->auth_handle))(pr->m->auth_handle_context, pr->properties, pr->reasonCode);
MQTTProperties_free(pr->properties);
free(pr->properties);
free(pr);
return 0;
}
#endif
/* This is the thread function that handles the calling of callback functions if set */
static thread_return_type WINAPI MQTTClient_run(void* n)
{
long timeout = 10L; /* first time in we have a small timeout. Gets things started more quickly */
FUNC_ENTRY;
Thread_set_name("MQTTClient_run");
Paho_thread_lock_mutex(mqttclient_mutex);
run_id = Paho_thread_getid();
running = 1;
while (!tostop)
{
int rc = SOCKET_ERROR;
SOCKET sock = -1;
MQTTClients* m = NULL;
MQTTPacket* pack = NULL;
Paho_thread_unlock_mutex(mqttclient_mutex);
pack = MQTTClient_cycle(&sock, timeout, &rc);
Paho_thread_lock_mutex(mqttclient_mutex);
if (tostop)
break;
timeout = 100L;
/* find client corresponding to socket */
if (ListFindItem(handles, &sock, clientSockCompare) == NULL)
{
/* assert: should not happen */
continue;
}
m = (MQTTClient)(handles->current->content);
if (m == NULL)
{
/* assert: should not happen */
continue;
}
if (rc == SOCKET_ERROR)
{
if (m->c->connected)
MQTTClient_disconnect_internal(m, 0);
else
{
if (m->c->connect_state == SSL_IN_PROGRESS)
{
Log(TRACE_MIN, -1, "Posting connect semaphore for client %s", m->c->clientID);
m->c->connect_state = NOT_IN_PROGRESS;
Thread_post_sem(m->connect_sem);
}
if (m->c->connect_state == WAIT_FOR_CONNACK)
{
Log(TRACE_MIN, -1, "Posting connack semaphore for client %s", m->c->clientID);
m->c->connect_state = NOT_IN_PROGRESS;
Thread_post_sem(m->connack_sem);
}
}
}
else
{
if (m->c->messageQueue->count > 0 && m->ma)
{
qEntry* qe = (qEntry*)(m->c->messageQueue->first->content);
int topicLen = qe->topicLen;
if (strlen(qe->topicName) == topicLen)
topicLen = 0;
Log(TRACE_MIN, -1, "Calling messageArrived for client %s, queue depth %d",
m->c->clientID, m->c->messageQueue->count);
Paho_thread_unlock_mutex(mqttclient_mutex);
rc = (*(m->ma))(m->context, qe->topicName, topicLen, qe->msg);
Paho_thread_lock_mutex(mqttclient_mutex);
/* if 0 (false) is returned by the callback then it failed, so we don't remove the message from
* the queue, and it will be retried later. If 1 is returned then the message data may have been freed,
* so we must be careful how we use it.
*/
if (rc)
{
#if !defined(NO_PERSISTENCE)
if (m->c->persistence)
MQTTPersistence_unpersistQueueEntry(m->c, (MQTTPersistence_qEntry*)qe);
#endif
ListRemove(m->c->messageQueue, qe);
}
else
Log(TRACE_MIN, -1, "False returned from messageArrived for client %s, message remains on queue",
m->c->clientID);
}
if (pack)
{
if (pack->header.bits.type == CONNACK)
{
Log(TRACE_MIN, -1, "Posting connack semaphore for client %s", m->c->clientID);
m->pack = pack;
Thread_post_sem(m->connack_sem);
}
else if (pack->header.bits.type == SUBACK)
{
Log(TRACE_MIN, -1, "Posting suback semaphore for client %s", m->c->clientID);
m->pack = pack;
Thread_post_sem(m->suback_sem);
}
else if (pack->header.bits.type == UNSUBACK)
{
Log(TRACE_MIN, -1, "Posting unsuback semaphore for client %s", m->c->clientID);
m->pack = pack;
Thread_post_sem(m->unsuback_sem);
}
else if (m->c->MQTTVersion >= MQTTVERSION_5)
{
if (pack->header.bits.type == DISCONNECT && m->disconnected)
{
struct props_rc_parms* dp;
Ack* disc = (Ack*)pack;
dp = malloc(sizeof(struct props_rc_parms));
if (dp)
{
dp->m = m;
dp->reasonCode = disc->rc;
dp->properties = malloc(sizeof(MQTTProperties));
if (dp->properties)
{
*(dp->properties) = disc->properties;
MQTTClient_disconnect1(m, 10, 0, 1, MQTTREASONCODE_SUCCESS, NULL);
Log(TRACE_MIN, -1, "Calling disconnected for client %s", m->c->clientID);
Paho_thread_start(call_disconnected, dp);
}
else
free(dp);
}
free(disc);
}
#if 0
if (pack->header.bits.type == AUTH && m->auth_handle)
{
struct props_rc_parms dp;
Ack* disc = (Ack*)pack;
dp.m = m;
dp.properties = &disc->properties;
dp.reasonCode = disc->rc;
free(pack);
Log(TRACE_MIN, -1, "Calling auth_handle for client %s", m->c->clientID);
Paho_thread_start(call_auth_handle, &dp);
}
#endif
}
}
else if (m->c->connect_state == TCP_IN_PROGRESS)
{
int error;
socklen_t len = sizeof(error);
if ((m->rc = getsockopt(m->c->net.socket, SOL_SOCKET, SO_ERROR, (char*)&error, &len)) == 0)
m->rc = error;
Log(TRACE_MIN, -1, "Posting connect semaphore for client %s rc %d", m->c->clientID, m->rc);
m->c->connect_state = NOT_IN_PROGRESS;
Thread_post_sem(m->connect_sem);
}
#if defined(OPENSSL)
else if (m->c->connect_state == SSL_IN_PROGRESS)
{
rc = m->c->sslopts->struct_version >= 3 ?
SSLSocket_connect(m->c->net.ssl, m->c->net.socket, m->serverURI,
m->c->sslopts->verify, m->c->sslopts->ssl_error_cb, m->c->sslopts->ssl_error_context) :
SSLSocket_connect(m->c->net.ssl, m->c->net.socket, m->serverURI,
m->c->sslopts->verify, NULL, NULL);
if (rc == 1 || rc == SSL_FATAL)
{
if (rc == 1 && (m->c->cleansession == 0 && m->c->cleanstart == 0) && m->c->session == NULL)
m->c->session = SSL_get1_session(m->c->net.ssl);
m->rc = rc;
Log(TRACE_MIN, -1, "Posting connect semaphore for SSL client %s rc %d", m->c->clientID, m->rc);
m->c->connect_state = NOT_IN_PROGRESS;
Thread_post_sem(m->connect_sem);
}
}