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PreVerify/mqtt/paho.mqtt.c/MQTTClient.c
chenchaohong e45851d2b3 第一次提交
2024-09-09 19:18:28 +08:00

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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, &current))
{
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);
}
}
#endif
else if (m->c->connect_state == WEBSOCKET_IN_PROGRESS)
{
if (rc != TCPSOCKET_INTERRUPTED)
{
Log(TRACE_MIN, -1, "Posting websocket handshake for client %s rc %d", m->c->clientID, m->rc);
m->c->connect_state = WAIT_FOR_CONNACK;
Thread_post_sem(m->connect_sem);
}
}
}
}
run_id = 0;
running = tostop = 0;
Paho_thread_unlock_mutex(mqttclient_mutex);
FUNC_EXIT;
#if defined(_WIN32) || defined(_WIN64)
ExitThread(0);
#endif
return 0;
}
static int MQTTClient_stop(void)
{
int rc = 0;
FUNC_ENTRY;
if (running == 1 && tostop == 0)
{
int conn_count = 0;
ListElement* current = NULL;
if (handles != NULL)
{
/* find out how many handles are still connected */
while (ListNextElement(handles, &current))
{
if (((MQTTClients*)(current->content))->c->connect_state > NOT_IN_PROGRESS ||
((MQTTClients*)(current->content))->c->connected)
++conn_count;
}
}
Log(TRACE_MIN, -1, "Conn_count is %d", conn_count);
/* stop the background thread, if we are the last one to be using it */
if (conn_count == 0)
{
int count = 0;
tostop = 1;
if (Paho_thread_getid() != run_id)
{
while (running && ++count < 100)
{
Paho_thread_unlock_mutex(mqttclient_mutex);
Log(TRACE_MIN, -1, "sleeping");
MQTTTime_sleep(100L);
Paho_thread_lock_mutex(mqttclient_mutex);
}
}
rc = 1;
}
}
FUNC_EXIT_RC(rc);
return rc;
}
int MQTTClient_setCallbacks(MQTTClient handle, void* context, MQTTClient_connectionLost* cl,
MQTTClient_messageArrived* ma, MQTTClient_deliveryComplete* dc)
{
int rc = MQTTCLIENT_SUCCESS;
MQTTClients* m = handle;
FUNC_ENTRY;
Paho_thread_lock_mutex(mqttclient_mutex);
if (m == NULL || ma == NULL || m->c->connect_state != NOT_IN_PROGRESS)
rc = MQTTCLIENT_FAILURE;
else
{
m->context = context;
m->cl = cl;
m->ma = ma;
m->dc = dc;
}
Paho_thread_unlock_mutex(mqttclient_mutex);
FUNC_EXIT_RC(rc);
return rc;
}
static void MQTTClient_closeSession(Clients* client, enum MQTTReasonCodes reason, MQTTProperties* props)
{
FUNC_ENTRY;
client->good = 0;
client->ping_outstanding = 0;
client->ping_due = 0;
if (client->net.socket > 0)
{
if (client->connected)
MQTTPacket_send_disconnect(client, reason, props);
Paho_thread_lock_mutex(socket_mutex);
WebSocket_close(&client->net, WebSocket_CLOSE_NORMAL, NULL);
#if defined(OPENSSL)
SSL_SESSION_free(client->session); /* is a no-op if session is NULL */
client->session = NULL; /* show the session has been freed */
SSLSocket_close(&client->net);
#endif
Paho_thread_unlock_mutex(socket_mutex);
Socket_close(client->net.socket);
client->net.socket = 0;
#if defined(OPENSSL)
client->net.ssl = NULL;
#endif
}
client->connected = 0;
client->connect_state = NOT_IN_PROGRESS;
if (client->MQTTVersion < MQTTVERSION_5 && client->cleansession)
MQTTClient_cleanSession(client);
FUNC_EXIT;
}
static int MQTTClient_cleanSession(Clients* client)
{
int rc = 0;
FUNC_ENTRY;
#if !defined(NO_PERSISTENCE)
rc = MQTTPersistence_clear(client);
#endif
MQTTProtocol_emptyMessageList(client->inboundMsgs);
MQTTProtocol_emptyMessageList(client->outboundMsgs);
MQTTClient_emptyMessageQueue(client);
client->msgID = 0;
FUNC_EXIT_RC(rc);
return rc;
}
void Protocol_processPublication(Publish* publish, Clients* client, int allocatePayload)
{
qEntry* qe = NULL;
MQTTClient_message* mm = NULL;
MQTTClient_message initialized = MQTTClient_message_initializer;
FUNC_ENTRY;
qe = malloc(sizeof(qEntry));
if (!qe)
goto exit;
mm = malloc(sizeof(MQTTClient_message));
if (!mm)
{
free(qe);
goto exit;
}
memcpy(mm, &initialized, sizeof(MQTTClient_message));
qe->msg = mm;
qe->topicName = publish->topic;
qe->topicLen = publish->topiclen;
publish->topic = NULL;
if (allocatePayload)
{
mm->payload = malloc(publish->payloadlen);
if (mm->payload == NULL)
{
free(mm);
free(qe);
goto exit;
}
memcpy(mm->payload, publish->payload, publish->payloadlen);
}
else
mm->payload = publish->payload;
mm->payloadlen = publish->payloadlen;
mm->qos = publish->header.bits.qos;
mm->retained = publish->header.bits.retain;
if (publish->header.bits.qos == 2)
mm->dup = 0; /* ensure that a QoS2 message is not passed to the application with dup = 1 */
else
mm->dup = publish->header.bits.dup;
mm->msgid = publish->msgId;
if (publish->MQTTVersion >= 5)
mm->properties = MQTTProperties_copy(&publish->properties);
ListAppend(client->messageQueue, qe, sizeof(qe) + sizeof(mm) + mm->payloadlen + strlen(qe->topicName)+1);
#if !defined(NO_PERSISTENCE)
if (client->persistence)
MQTTPersistence_persistQueueEntry(client, (MQTTPersistence_qEntry*)qe);
#endif
exit:
FUNC_EXIT;
}
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)
{
MQTTClients* m = handle;
int rc = SOCKET_ERROR;
int sessionPresent = 0;
MQTTResponse resp = MQTTResponse_initializer;
FUNC_ENTRY;
resp.reasonCode = SOCKET_ERROR;
if (m->ma && !running)
{
int count = 0;
Paho_thread_start(MQTTClient_run, handle);
if (MQTTTime_elapsed(start) >= millisecsTimeout)
{
rc = SOCKET_ERROR;
goto exit;
}
while (!running && ++count < 5)
{
Paho_thread_unlock_mutex(mqttclient_mutex);
MQTTTime_sleep(100L);
Paho_thread_lock_mutex(mqttclient_mutex);
}
if (!running)
{
rc = SOCKET_ERROR;
goto exit;
}
}
Log(TRACE_MIN, -1, "Connecting to serverURI %s with MQTT version %d", serverURI, MQTTVersion);
#if defined(OPENSSL)
#if defined(__GNUC__) && defined(__linux__)
rc = MQTTProtocol_connect(serverURI, m->c, m->ssl, m->websocket, MQTTVersion, connectProperties, willProperties,
millisecsTimeout - MQTTTime_elapsed(start));
#else
rc = MQTTProtocol_connect(serverURI, m->c, m->ssl, m->websocket, MQTTVersion, connectProperties, willProperties);
#endif
#else
#if defined(__GNUC__) && defined(__linux__)
rc = MQTTProtocol_connect(serverURI, m->c, m->websocket, MQTTVersion, connectProperties, willProperties,
millisecsTimeout - MQTTTime_elapsed(start));
#else
rc = MQTTProtocol_connect(serverURI, m->c, m->websocket, MQTTVersion, connectProperties, willProperties);
#endif
#endif
if (rc == SOCKET_ERROR)
goto exit;
if (m->c->connect_state == NOT_IN_PROGRESS)
{
rc = SOCKET_ERROR;
goto exit;
}
if (m->c->connect_state == TCP_IN_PROGRESS) /* TCP connect started - wait for completion */
{
Paho_thread_unlock_mutex(mqttclient_mutex);
MQTTClient_waitfor(handle, CONNECT, &rc, millisecsTimeout - MQTTTime_elapsed(start));
Paho_thread_lock_mutex(mqttclient_mutex);
if (rc != 0)
{
rc = SOCKET_ERROR;
goto exit;
}
#if defined(OPENSSL)
if (m->ssl)
{
int port1;
size_t hostname_len;
const char *topic;
int setSocketForSSLrc = 0;
if (m->c->net.https_proxy) {
m->c->connect_state = PROXY_CONNECT_IN_PROGRESS;
if ((rc = Proxy_connect( &m->c->net, 1, serverURI)) == SOCKET_ERROR )
goto exit;
}
hostname_len = MQTTProtocol_addressPort(serverURI, &port1, &topic, MQTT_DEFAULT_PORT);
setSocketForSSLrc = SSLSocket_setSocketForSSL(&m->c->net, m->c->sslopts,
serverURI, hostname_len);
if (setSocketForSSLrc != MQTTCLIENT_SUCCESS)
{
if (m->c->session != NULL)
if ((rc = SSL_set_session(m->c->net.ssl, m->c->session)) != 1)
Log(TRACE_MIN, -1, "Failed to set SSL session with stored data, non critical");
rc = m->c->sslopts->struct_version >= 3 ?
SSLSocket_connect(m->c->net.ssl, m->c->net.socket, 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, serverURI,
m->c->sslopts->verify, NULL, NULL);
if (rc == TCPSOCKET_INTERRUPTED)
m->c->connect_state = SSL_IN_PROGRESS; /* the connect is still in progress */
else if (rc == SSL_FATAL)
{
rc = SOCKET_ERROR;
goto exit;
}
else if (rc == 1)
{
if (m->websocket)
{
m->c->connect_state = WEBSOCKET_IN_PROGRESS;
rc = WebSocket_connect(&m->c->net, 1, serverURI);
if ( rc == SOCKET_ERROR )
goto exit;
}
else
{
rc = MQTTCLIENT_SUCCESS;
m->c->connect_state = WAIT_FOR_CONNACK;
if (MQTTPacket_send_connect(m->c, MQTTVersion, connectProperties, willProperties) == SOCKET_ERROR)
{
rc = SOCKET_ERROR;
goto exit;
}
if ((m->c->cleansession == 0 && m->c->cleanstart == 0) && m->c->session == NULL)
m->c->session = SSL_get1_session(m->c->net.ssl);
}
}
}
else
{
rc = SOCKET_ERROR;
goto exit;
}
}
#endif
else
{
if (m->c->net.http_proxy) {
m->c->connect_state = PROXY_CONNECT_IN_PROGRESS;
if ((rc = Proxy_connect( &m->c->net, 0, serverURI)) == SOCKET_ERROR )
goto exit;
}
if (m->websocket)
{
m->c->connect_state = WEBSOCKET_IN_PROGRESS;
if ( WebSocket_connect(&m->c->net, 0, serverURI) == SOCKET_ERROR )
{
rc = SOCKET_ERROR;
goto exit;
}
}
else
{
m->c->connect_state = WAIT_FOR_CONNACK; /* TCP connect completed, in which case send the MQTT connect packet */
if (MQTTPacket_send_connect(m->c, MQTTVersion, connectProperties, willProperties) == SOCKET_ERROR)
{
rc = SOCKET_ERROR;
goto exit;
}
}
}
}
#if defined(OPENSSL)
if (m->c->connect_state == SSL_IN_PROGRESS) /* SSL connect sent - wait for completion */
{
Paho_thread_unlock_mutex(mqttclient_mutex);
MQTTClient_waitfor(handle, CONNECT, &rc, millisecsTimeout - MQTTTime_elapsed(start));
Paho_thread_lock_mutex(mqttclient_mutex);
if (rc != 1)
{
rc = SOCKET_ERROR;
goto exit;
}
if((m->c->cleansession == 0 && m->c->cleanstart == 0) && m->c->session == NULL)
m->c->session = SSL_get1_session(m->c->net.ssl);
if ( m->websocket )
{
/* wait for websocket connect */
m->c->connect_state = WEBSOCKET_IN_PROGRESS;
rc = WebSocket_connect( &m->c->net, 1, serverURI);
if ( rc != 1 )
{
rc = SOCKET_ERROR;
goto exit;
}
}
else
{
m->c->connect_state = WAIT_FOR_CONNACK; /* TCP connect completed, in which case send the MQTT connect packet */
if (MQTTPacket_send_connect(m->c, MQTTVersion, connectProperties, willProperties) == SOCKET_ERROR)
{
rc = SOCKET_ERROR;
goto exit;
}
}
}
#endif
if (m->c->connect_state == WEBSOCKET_IN_PROGRESS) /* websocket request sent - wait for upgrade */
{
Paho_thread_unlock_mutex(mqttclient_mutex);
MQTTClient_waitfor(handle, CONNECT, &rc, millisecsTimeout - MQTTTime_elapsed(start));
Paho_thread_lock_mutex(mqttclient_mutex);
m->c->connect_state = WAIT_FOR_CONNACK; /* websocket upgrade complete */
if (MQTTPacket_send_connect(m->c, MQTTVersion, connectProperties, willProperties) == SOCKET_ERROR)
{
rc = SOCKET_ERROR;
goto exit;
}
}
if (m->c->connect_state == WAIT_FOR_CONNACK) /* MQTT connect sent - wait for CONNACK */
{
MQTTPacket* pack = NULL;
Paho_thread_unlock_mutex(mqttclient_mutex);
pack = MQTTClient_waitfor(handle, CONNACK, &rc, millisecsTimeout - MQTTTime_elapsed(start));
Paho_thread_lock_mutex(mqttclient_mutex);
if (pack == NULL)
rc = SOCKET_ERROR;
else
{
Connack* connack = (Connack*)pack;
Log(TRACE_PROTOCOL, 1, NULL, m->c->net.socket, m->c->clientID, connack->rc);
if ((rc = connack->rc) == MQTTCLIENT_SUCCESS)
{
m->c->connected = 1;
m->c->good = 1;
m->c->connect_state = NOT_IN_PROGRESS;
if (MQTTVersion == 4)
sessionPresent = connack->flags.bits.sessionPresent;
if (m->c->cleansession || m->c->cleanstart)
rc = MQTTClient_cleanSession(m->c);
if (m->c->outboundMsgs->count > 0)
{
ListElement* outcurrent = NULL;
START_TIME_TYPE zero = START_TIME_ZERO;
while (ListNextElement(m->c->outboundMsgs, &outcurrent))
{
Messages* m = (Messages*)(outcurrent->content);
memset(&m->lastTouch, '\0', sizeof(m->lastTouch));
}
MQTTProtocol_retry(zero, 1, 1);
if (m->c->connected != 1)
rc = MQTTCLIENT_DISCONNECTED;
}
if (m->c->MQTTVersion == MQTTVERSION_5)
{
if ((resp.properties = malloc(sizeof(MQTTProperties))) == NULL)
{
rc = PAHO_MEMORY_ERROR;
goto exit;
}
*resp.properties = MQTTProperties_copy(&connack->properties);
}
}
MQTTPacket_freeConnack(connack);
m->pack = NULL;
}
}
exit:
if (rc == MQTTCLIENT_SUCCESS)
{
if (options->struct_version >= 4) /* means we have to fill out return values */
{
options->returned.serverURI = serverURI;
options->returned.MQTTVersion = MQTTVersion;
options->returned.sessionPresent = sessionPresent;
}
}
else
MQTTClient_disconnect1(handle, 0, 0, (MQTTVersion == 3), MQTTREASONCODE_SUCCESS, NULL); /* don't want to call connection lost */
resp.reasonCode = rc;
FUNC_EXIT_RC(resp.reasonCode);
return resp;
}
static int retryLoopIntervalms = 5000;
void setRetryLoopInterval(int keepalive)
{
retryLoopIntervalms = (keepalive*1000) / 10;
if (retryLoopIntervalms < 100)
retryLoopIntervalms = 100;
else if (retryLoopIntervalms > 5000)
retryLoopIntervalms = 5000;
}
static MQTTResponse MQTTClient_connectURI(MQTTClient handle, MQTTClient_connectOptions* options, const char* serverURI,
MQTTProperties* connectProperties, MQTTProperties* willProperties)
{
MQTTClients* m = handle;
START_TIME_TYPE start;
ELAPSED_TIME_TYPE millisecsTimeout = 30000L;
MQTTResponse rc = MQTTResponse_initializer;
int MQTTVersion = 0;
FUNC_ENTRY;
rc.reasonCode = SOCKET_ERROR;
millisecsTimeout = options->connectTimeout * 1000;
start = MQTTTime_start_clock();
m->currentServerURI = serverURI;
m->c->keepAliveInterval = options->keepAliveInterval;
m->c->retryInterval = options->retryInterval;
setRetryLoopInterval(options->keepAliveInterval);
m->c->MQTTVersion = options->MQTTVersion;
m->c->cleanstart = m->c->cleansession = 0;
if (m->c->MQTTVersion >= MQTTVERSION_5)
m->c->cleanstart = options->cleanstart;
else
m->c->cleansession = options->cleansession;
m->c->maxInflightMessages = (options->reliable) ? 1 : 10;
if (options->struct_version >= 6)
{
if (options->maxInflightMessages > 0)
m->c->maxInflightMessages = options->maxInflightMessages;
}
if (options->struct_version >= 7)
{
m->c->net.httpHeaders = options->httpHeaders;
}
if (options->struct_version >= 8)
{
if (options->httpProxy)
m->c->httpProxy = MQTTStrdup(options->httpProxy);
if (options->httpsProxy)
m->c->httpsProxy = MQTTStrdup(options->httpsProxy);
}
if (m->c->will)
{
free(m->c->will->payload);
free(m->c->will->topic);
free(m->c->will);
m->c->will = NULL;
}
if (options->will && (options->will->struct_version == 0 || options->will->struct_version == 1))
{
const void* source = NULL;
if ((m->c->will = malloc(sizeof(willMessages))) == NULL)
{
rc.reasonCode = PAHO_MEMORY_ERROR;
goto exit;
}
if (options->will->message || (options->will->struct_version == 1 && options->will->payload.data))
{
if (options->will->struct_version == 1 && options->will->payload.data)
{
m->c->will->payloadlen = options->will->payload.len;
source = options->will->payload.data;
}
else
{
m->c->will->payloadlen = (int)strlen(options->will->message);
source = (void*)options->will->message;
}
if ((m->c->will->payload = malloc(m->c->will->payloadlen)) == NULL)
{
free(m->c->will);
rc.reasonCode = PAHO_MEMORY_ERROR;
goto exit;
}
memcpy(m->c->will->payload, source, m->c->will->payloadlen);
}
else
{
m->c->will->payload = NULL;
m->c->will->payloadlen = 0;
}
m->c->will->qos = options->will->qos;
m->c->will->retained = options->will->retained;
m->c->will->topic = MQTTStrdup(options->will->topicName);
}
#if defined(OPENSSL)
if (m->c->sslopts)
{
if (m->c->sslopts->trustStore)
free((void*)m->c->sslopts->trustStore);
if (m->c->sslopts->keyStore)
free((void*)m->c->sslopts->keyStore);
if (m->c->sslopts->privateKey)
free((void*)m->c->sslopts->privateKey);
if (m->c->sslopts->privateKeyPassword)
free((void*)m->c->sslopts->privateKeyPassword);
if (m->c->sslopts->enabledCipherSuites)
free((void*)m->c->sslopts->enabledCipherSuites);
if (m->c->sslopts->struct_version >= 2)
{
if (m->c->sslopts->CApath)
free((void*)m->c->sslopts->CApath);
}
free(m->c->sslopts);
m->c->sslopts = NULL;
}
if (options->struct_version != 0 && options->ssl)
{
if ((m->c->sslopts = malloc(sizeof(MQTTClient_SSLOptions))) == NULL)
{
rc.reasonCode = PAHO_MEMORY_ERROR;
goto exit;
}
memset(m->c->sslopts, '\0', sizeof(MQTTClient_SSLOptions));
m->c->sslopts->struct_version = options->ssl->struct_version;
if (options->ssl->trustStore)
m->c->sslopts->trustStore = MQTTStrdup(options->ssl->trustStore);
if (options->ssl->keyStore)
m->c->sslopts->keyStore = MQTTStrdup(options->ssl->keyStore);
if (options->ssl->privateKey)
m->c->sslopts->privateKey = MQTTStrdup(options->ssl->privateKey);
if (options->ssl->privateKeyPassword)
m->c->sslopts->privateKeyPassword = MQTTStrdup(options->ssl->privateKeyPassword);
if (options->ssl->enabledCipherSuites)
m->c->sslopts->enabledCipherSuites = MQTTStrdup(options->ssl->enabledCipherSuites);
m->c->sslopts->enableServerCertAuth = options->ssl->enableServerCertAuth;
if (m->c->sslopts->struct_version >= 1)
m->c->sslopts->sslVersion = options->ssl->sslVersion;
if (m->c->sslopts->struct_version >= 2)
{
m->c->sslopts->verify = options->ssl->verify;
if (options->ssl->CApath)
m->c->sslopts->CApath = MQTTStrdup(options->ssl->CApath);
}
if (m->c->sslopts->struct_version >= 3)
{
m->c->sslopts->ssl_error_cb = options->ssl->ssl_error_cb;
m->c->sslopts->ssl_error_context = options->ssl->ssl_error_context;
}
if (m->c->sslopts->struct_version >= 4)
{
m->c->sslopts->ssl_psk_cb = options->ssl->ssl_psk_cb;
m->c->sslopts->ssl_psk_context = options->ssl->ssl_psk_context;
m->c->sslopts->disableDefaultTrustStore = options->ssl->disableDefaultTrustStore;
}
if (m->c->sslopts->struct_version >= 5)
{
m->c->sslopts->protos = options->ssl->protos;
m->c->sslopts->protos_len = options->ssl->protos_len;
}
}
#endif
if (m->c->username)
{
free((void*)m->c->username);
m->c->username = NULL;
}
if (options->username)
m->c->username = MQTTStrdup(options->username);
if (m->c->password)
{
free((void*)m->c->password);
m->c->password = NULL;
}
if (options->password)
{
m->c->password = MQTTStrdup(options->password);
m->c->passwordlen = (int)strlen(options->password);
}
else if (options->struct_version >= 5 && options->binarypwd.data)
{
m->c->passwordlen = options->binarypwd.len;
if ((m->c->password = malloc(m->c->passwordlen)) == NULL)
{
rc.reasonCode = PAHO_MEMORY_ERROR;
goto exit;
}
memcpy((void*)m->c->password, options->binarypwd.data, m->c->passwordlen);
}
if (options->struct_version >= 3)
MQTTVersion = options->MQTTVersion;
else
MQTTVersion = MQTTVERSION_DEFAULT;
if (MQTTVersion == MQTTVERSION_DEFAULT)
{
rc = MQTTClient_connectURIVersion(handle, options, serverURI, 4, start, millisecsTimeout,
connectProperties, willProperties);
if (rc.reasonCode != MQTTCLIENT_SUCCESS)
{
rc = MQTTClient_connectURIVersion(handle, options, serverURI, 3, start, millisecsTimeout,
connectProperties, willProperties);
}
}
else
rc = MQTTClient_connectURIVersion(handle, options, serverURI, MQTTVersion, start, millisecsTimeout,
connectProperties, willProperties);
exit:
FUNC_EXIT_RC(rc.reasonCode);
return rc;
}
MQTTResponse MQTTClient_connectAll(MQTTClient handle, MQTTClient_connectOptions* options,
MQTTProperties* connectProperties, MQTTProperties* willProperties);
int MQTTClient_connect(MQTTClient handle, MQTTClient_connectOptions* options)
{
MQTTClients* m = handle;
MQTTResponse response;
if (m != NULL && m->c != NULL && m->c->MQTTVersion >= MQTTVERSION_5)
return MQTTCLIENT_WRONG_MQTT_VERSION;
response = MQTTClient_connectAll(handle, options, NULL, NULL);
return response.reasonCode;
}
MQTTResponse MQTTClient_connect5(MQTTClient handle, MQTTClient_connectOptions* options,
MQTTProperties* connectProperties, MQTTProperties* willProperties)
{
MQTTClients* m = handle;
MQTTResponse response = MQTTResponse_initializer;
if (m != NULL && m->c != NULL && m->c->MQTTVersion < MQTTVERSION_5)
{
response.reasonCode = MQTTCLIENT_WRONG_MQTT_VERSION;
return response;
}
return MQTTClient_connectAll(handle, options, connectProperties, willProperties);
}
MQTTResponse MQTTClient_connectAll(MQTTClient handle, MQTTClient_connectOptions* options,
MQTTProperties* connectProperties, MQTTProperties* willProperties)
{
MQTTClients* m = handle;
MQTTResponse rc = MQTTResponse_initializer;
FUNC_ENTRY;
Paho_thread_lock_mutex(connect_mutex);
Paho_thread_lock_mutex(mqttclient_mutex);
rc.reasonCode = SOCKET_ERROR;
if (!library_initialized)
{
rc.reasonCode = MQTTCLIENT_FAILURE;
goto exit;
}
if (options == NULL || m == NULL || m->c == NULL)
{
rc.reasonCode = MQTTCLIENT_NULL_PARAMETER;
goto exit;
}
if (strncmp(options->struct_id, "MQTC", 4) != 0 || options->struct_version < 0 || options->struct_version > 8)
{
rc.reasonCode = MQTTCLIENT_BAD_STRUCTURE;
goto exit;
}
#if defined(OPENSSL)
if (m->ssl && options->ssl == NULL)
{
rc.reasonCode = MQTTCLIENT_NULL_PARAMETER;
goto exit;
}
#endif
if (options->will) /* check validity of will options structure */
{
if (strncmp(options->will->struct_id, "MQTW", 4) != 0 || (options->will->struct_version != 0 && options->will->struct_version != 1))
{
rc.reasonCode = MQTTCLIENT_BAD_STRUCTURE;
goto exit;
}
if (options->will->qos < 0 || options->will->qos > 2)
{
rc.reasonCode = MQTTCLIENT_BAD_QOS;
goto exit;
}
if (options->will->topicName == NULL)
{
rc.reasonCode = MQTTCLIENT_NULL_PARAMETER;
goto exit;
} else if (strlen(options->will->topicName) == 0)
{
rc.reasonCode = MQTTCLIENT_0_LEN_WILL_TOPIC;
goto exit;
}
}
#if defined(OPENSSL)
if (options->struct_version != 0 && options->ssl) /* check validity of SSL options structure */
{
if (strncmp(options->ssl->struct_id, "MQTS", 4) != 0 || options->ssl->struct_version < 0 || options->ssl->struct_version > 5)
{
rc.reasonCode = MQTTCLIENT_BAD_STRUCTURE;
goto exit;
}
}
#endif
if ((options->username && !UTF8_validateString(options->username)) ||
(options->password && !UTF8_validateString(options->password)))
{
rc.reasonCode = MQTTCLIENT_BAD_UTF8_STRING;
goto exit;
}
if (options->MQTTVersion != MQTTVERSION_DEFAULT &&
(options->MQTTVersion < MQTTVERSION_3_1 || options->MQTTVersion > MQTTVERSION_5))
{
rc.reasonCode = MQTTCLIENT_BAD_MQTT_VERSION;
goto exit;
}
if (options->MQTTVersion >= MQTTVERSION_5)
{
if (options->cleansession != 0)
{
rc.reasonCode = MQTTCLIENT_BAD_MQTT_OPTION;
goto exit;
}
}
else if (options->cleanstart != 0)
{
rc.reasonCode = MQTTCLIENT_BAD_MQTT_OPTION;
goto exit;
}
if (options->struct_version < 2 || options->serverURIcount == 0)
{
if ( !m )
{
rc.reasonCode = MQTTCLIENT_NULL_PARAMETER;
goto exit;
}
rc = MQTTClient_connectURI(handle, options, m->serverURI, connectProperties, willProperties);
}
else
{
int i;
for (i = 0; i < options->serverURIcount; ++i)
{
char* serverURI = options->serverURIs[i];
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_TCP);
else if (strncmp(URI_WS, serverURI, strlen(URI_WS)) == 0)
{
serverURI += strlen(URI_WS);
m->websocket = 1;
}
#if defined(OPENSSL)
else if (strncmp(URI_SSL, serverURI, strlen(URI_SSL)) == 0)
{
serverURI += strlen(URI_SSL);
m->ssl = 1;
}
else if (strncmp(URI_MQTTS, serverURI, strlen(URI_MQTTS)) == 0)
{
serverURI += strlen(URI_MQTTS);
m->ssl = 1;
}
else if (strncmp(URI_WSS, serverURI, strlen(URI_WSS)) == 0)
{
serverURI += strlen(URI_WSS);
m->ssl = 1;
m->websocket = 1;
}
#endif
rc = MQTTClient_connectURI(handle, options, serverURI, connectProperties, willProperties);
if (rc.reasonCode == MQTTREASONCODE_SUCCESS)
break;
}
}
if (rc.reasonCode == MQTTREASONCODE_SUCCESS)
{
if (rc.properties && MQTTProperties_hasProperty(rc.properties, MQTTPROPERTY_CODE_RECEIVE_MAXIMUM))
{
int recv_max = MQTTProperties_getNumericValue(rc.properties, MQTTPROPERTY_CODE_RECEIVE_MAXIMUM);
if (m->c->maxInflightMessages > recv_max)
m->c->maxInflightMessages = recv_max;
}
}
exit:
if (m && m->c && m->c->will)
{
if (m->c->will->payload)
free(m->c->will->payload);
if (m->c->will->topic)
free(m->c->will->topic);
free(m->c->will);
m->c->will = NULL;
}
Paho_thread_unlock_mutex(mqttclient_mutex);
Paho_thread_unlock_mutex(connect_mutex);
FUNC_EXIT_RC(rc.reasonCode);
return rc;
}
/**
* mqttclient_mutex must be locked when you call this function, if multi threaded
*/
static int MQTTClient_disconnect1(MQTTClient handle, int timeout, int call_connection_lost, int stop,
enum MQTTReasonCodes reason, MQTTProperties* props)
{
MQTTClients* m = handle;
START_TIME_TYPE start;
int rc = MQTTCLIENT_SUCCESS;
int was_connected = 0;
struct conlost_sync_data sync = {
NULL, m
};
FUNC_ENTRY;
if (m == NULL || m->c == NULL)
{
rc = MQTTCLIENT_FAILURE;
goto exit;
}
was_connected = m->c->connected; /* should be 1 */
if (m->c->connected != 0)
{
start = MQTTTime_start_clock();
m->c->connect_state = DISCONNECTING; /* indicate disconnecting */
while (m->c->inboundMsgs->count > 0 || m->c->outboundMsgs->count > 0)
{ /* wait for all inflight message flows to finish, up to timeout */
if (MQTTTime_elapsed(start) >= (ELAPSED_TIME_TYPE)timeout)
break;
Paho_thread_unlock_mutex(mqttclient_mutex);
MQTTClient_yield();
Paho_thread_lock_mutex(mqttclient_mutex);
}
}
MQTTClient_closeSession(m->c, reason, props);
exit:
if (stop)
MQTTClient_stop();
if (call_connection_lost && m->cl && was_connected)
{
sync.sem = Thread_create_sem(&rc);
Log(TRACE_MIN, -1, "Calling connectionLost for client %s", m->c->clientID);
Paho_thread_start(connectionLost_call, &sync);
Thread_wait_sem(sync.sem, 5000);
Thread_destroy_sem(sync.sem);
}
FUNC_EXIT_RC(rc);
return rc;
}
/**
* mqttclient_mutex must be locked when you call this function, if multi threaded
*/
static int MQTTClient_disconnect_internal(MQTTClient handle, int timeout)
{
return MQTTClient_disconnect1(handle, timeout, 1, 1, MQTTREASONCODE_SUCCESS, NULL);
}
/**
* mqttclient_mutex must be locked when you call this function, if multi threaded
*/
void MQTTProtocol_closeSession(Clients* c, int sendwill)
{
MQTTClient_disconnect_internal((MQTTClient)c->context, 0);
}
int MQTTClient_disconnect(MQTTClient handle, int timeout)
{
int rc = 0;
Paho_thread_lock_mutex(mqttclient_mutex);
rc = MQTTClient_disconnect1(handle, timeout, 0, 1, MQTTREASONCODE_SUCCESS, NULL);
Paho_thread_unlock_mutex(mqttclient_mutex);
return rc;
}
int MQTTClient_disconnect5(MQTTClient handle, int timeout, enum MQTTReasonCodes reason, MQTTProperties* props)
{
int rc = 0;
Paho_thread_lock_mutex(mqttclient_mutex);
rc = MQTTClient_disconnect1(handle, timeout, 0, 1, reason, props);
Paho_thread_unlock_mutex(mqttclient_mutex);
return rc;
}
int MQTTClient_isConnected(MQTTClient handle)
{
MQTTClients* m = handle;
int rc = 0;
FUNC_ENTRY;
Paho_thread_lock_mutex(mqttclient_mutex);
if (m && m->c)
rc = m->c->connected;
Paho_thread_unlock_mutex(mqttclient_mutex);
FUNC_EXIT_RC(rc);
return rc;
}
MQTTResponse MQTTClient_subscribeMany5(MQTTClient handle, int count, char* const* topic,
int* qos, MQTTSubscribe_options* opts, MQTTProperties* props)
{
MQTTClients* m = handle;
List* topics = NULL;
List* qoss = NULL;
int i = 0;
int rc = MQTTCLIENT_FAILURE;
MQTTResponse resp = MQTTResponse_initializer;
int msgid = 0;
FUNC_ENTRY;
Paho_thread_lock_mutex(subscribe_mutex);
Paho_thread_lock_mutex(mqttclient_mutex);
resp.reasonCode = MQTTCLIENT_FAILURE;
if (m == NULL || m->c == NULL)
{
rc = MQTTCLIENT_FAILURE;
goto exit;
}
if (m->c->connected == 0)
{
rc = MQTTCLIENT_DISCONNECTED;
goto exit;
}
for (i = 0; i < count; i++)
{
if (!UTF8_validateString(topic[i]))
{
rc = MQTTCLIENT_BAD_UTF8_STRING;
goto exit;
}
if (qos[i] < 0 || qos[i] > 2)
{
rc = MQTTCLIENT_BAD_QOS;
goto exit;
}
}
if ((msgid = MQTTProtocol_assignMsgId(m->c)) == 0)
{
rc = MQTTCLIENT_MAX_MESSAGES_INFLIGHT;
goto exit;
}
topics = ListInitialize();
qoss = ListInitialize();
for (i = 0; i < count; i++)
{
ListAppend(topics, topic[i], strlen(topic[i]));
ListAppend(qoss, &qos[i], sizeof(int));
}
rc = MQTTProtocol_subscribe(m->c, topics, qoss, msgid, opts, props);
ListFreeNoContent(topics);
ListFreeNoContent(qoss);
if (rc == TCPSOCKET_COMPLETE)
{
MQTTPacket* pack = NULL;
Paho_thread_unlock_mutex(mqttclient_mutex);
pack = MQTTClient_waitfor(handle, SUBACK, &rc, m->commandTimeout);
Paho_thread_lock_mutex(mqttclient_mutex);
if (pack != NULL)
{
Suback* sub = (Suback*)pack;
if (m->c->MQTTVersion == MQTTVERSION_5)
{
if (sub->properties.count > 0)
{
if ((resp.properties = malloc(sizeof(MQTTProperties))) == NULL)
{
rc = PAHO_MEMORY_ERROR;
goto exit;
}
*resp.properties = MQTTProperties_copy(&sub->properties);
}
resp.reasonCodeCount = sub->qoss->count;
resp.reasonCode = *(int*)sub->qoss->first->content;
if (sub->qoss->count > 1)
{
ListElement* current = NULL;
int rc_count = 0;
if ((resp.reasonCodes = malloc(sizeof(enum MQTTReasonCodes) * (sub->qoss->count))) == NULL)
{
rc = PAHO_MEMORY_ERROR;
goto exit;
}
while (ListNextElement(sub->qoss, &current))
(resp.reasonCodes)[rc_count++] = *(enum MQTTReasonCodes*)(current->content);
}
}
else
{
ListElement *current = NULL;
/* if the returned count is greater than requested, it's an error*/
if (sub->qoss->count > count)
rc = MQTTCLIENT_FAILURE;
else
{
i = 0;
while (ListNextElement(sub->qoss, &current))
{
int *reqqos = (int*) (current->content);
qos[i++] = *reqqos;
}
}
resp.reasonCode = rc;
}
rc = MQTTProtocol_handleSubacks(pack, m->c->net.socket);
m->pack = NULL;
}
else
rc = SOCKET_ERROR;
}
if (rc == SOCKET_ERROR)
MQTTClient_disconnect_internal(handle, 0);
else if (rc == TCPSOCKET_COMPLETE)
rc = MQTTCLIENT_SUCCESS;
exit:
if (rc < 0)
resp.reasonCode = rc;
Paho_thread_unlock_mutex(mqttclient_mutex);
Paho_thread_unlock_mutex(subscribe_mutex);
FUNC_EXIT_RC(resp.reasonCode);
return resp;
}
int MQTTClient_subscribeMany(MQTTClient handle, int count, char* const* topic, int* qos)
{
MQTTClients* m = handle;
MQTTResponse response = MQTTResponse_initializer;
if (m != NULL && m->c != NULL && m->c->MQTTVersion >= MQTTVERSION_5)
response.reasonCode = MQTTCLIENT_WRONG_MQTT_VERSION;
else
response = MQTTClient_subscribeMany5(handle, count, topic, qos, NULL, NULL);
return response.reasonCode;
}
MQTTResponse MQTTClient_subscribe5(MQTTClient handle, const char* topic, int qos,
MQTTSubscribe_options* opts, MQTTProperties* props)
{
MQTTResponse rc;
FUNC_ENTRY;
rc = MQTTClient_subscribeMany5(handle, 1, (char * const *)(&topic), &qos, opts, props);
if (qos == MQTT_BAD_SUBSCRIBE) /* addition for MQTT 3.1.1 - error code from subscribe */
rc.reasonCode = MQTT_BAD_SUBSCRIBE;
FUNC_EXIT_RC(rc.reasonCode);
return rc;
}
int MQTTClient_subscribe(MQTTClient handle, const char* topic, int qos)
{
MQTTClients* m = handle;
MQTTResponse response = MQTTResponse_initializer;
if (m->c->MQTTVersion >= MQTTVERSION_5)
response.reasonCode = MQTTCLIENT_WRONG_MQTT_VERSION;
else
response = MQTTClient_subscribe5(handle, topic, qos, NULL, NULL);
return response.reasonCode;
}
MQTTResponse MQTTClient_unsubscribeMany5(MQTTClient handle, int count, char* const* topic, MQTTProperties* props)
{
MQTTClients* m = handle;
List* topics = NULL;
int i = 0;
int rc = SOCKET_ERROR;
MQTTResponse resp = MQTTResponse_initializer;
int msgid = 0;
FUNC_ENTRY;
Paho_thread_lock_mutex(subscribe_mutex);
Paho_thread_lock_mutex(mqttclient_mutex);
resp.reasonCode = MQTTCLIENT_FAILURE;
if (m == NULL || m->c == NULL)
{
rc = MQTTCLIENT_FAILURE;
goto exit;
}
if (m->c->connected == 0)
{
rc = MQTTCLIENT_DISCONNECTED;
goto exit;
}
for (i = 0; i < count; i++)
{
if (!UTF8_validateString(topic[i]))
{
rc = MQTTCLIENT_BAD_UTF8_STRING;
goto exit;
}
}
if ((msgid = MQTTProtocol_assignMsgId(m->c)) == 0)
{
rc = MQTTCLIENT_MAX_MESSAGES_INFLIGHT;
goto exit;
}
topics = ListInitialize();
for (i = 0; i < count; i++)
ListAppend(topics, topic[i], strlen(topic[i]));
rc = MQTTProtocol_unsubscribe(m->c, topics, msgid, props);
ListFreeNoContent(topics);
if (rc == TCPSOCKET_COMPLETE)
{
MQTTPacket* pack = NULL;
Paho_thread_unlock_mutex(mqttclient_mutex);
pack = MQTTClient_waitfor(handle, UNSUBACK, &rc, m->commandTimeout);
Paho_thread_lock_mutex(mqttclient_mutex);
if (pack != NULL)
{
Unsuback* unsub = (Unsuback*)pack;
if (m->c->MQTTVersion == MQTTVERSION_5)
{
if (unsub->properties.count > 0)
{
if ((resp.properties = malloc(sizeof(MQTTProperties))) == NULL)
{
rc = PAHO_MEMORY_ERROR;
goto exit;
}
*resp.properties = MQTTProperties_copy(&unsub->properties);
}
resp.reasonCodeCount = unsub->reasonCodes->count;
resp.reasonCode = *(int*)unsub->reasonCodes->first->content;
if (unsub->reasonCodes->count > 1)
{
ListElement* current = NULL;
int rc_count = 0;
if ((resp.reasonCodes = malloc(sizeof(enum MQTTReasonCodes) * (unsub->reasonCodes->count))) == NULL)
{
rc = PAHO_MEMORY_ERROR;
goto exit;
}
while (ListNextElement(unsub->reasonCodes, &current))
(resp.reasonCodes)[rc_count++] = *(enum MQTTReasonCodes*)(current->content);
}
}
else
resp.reasonCode = rc;
rc = MQTTProtocol_handleUnsubacks(pack, m->c->net.socket);
m->pack = NULL;
}
else
rc = SOCKET_ERROR;
}
if (rc == SOCKET_ERROR)
MQTTClient_disconnect_internal(handle, 0);
exit:
if (rc < 0)
resp.reasonCode = rc;
Paho_thread_unlock_mutex(mqttclient_mutex);
Paho_thread_unlock_mutex(subscribe_mutex);
FUNC_EXIT_RC(resp.reasonCode);
return resp;
}
int MQTTClient_unsubscribeMany(MQTTClient handle, int count, char* const* topic)
{
MQTTClients* m = handle;
MQTTResponse response = MQTTResponse_initializer;
if (m != NULL && m->c != NULL && m->c->MQTTVersion >= MQTTVERSION_5)
response.reasonCode = MQTTCLIENT_WRONG_MQTT_VERSION;
else
response = MQTTClient_unsubscribeMany5(handle, count, topic, NULL);
return response.reasonCode;
}
MQTTResponse MQTTClient_unsubscribe5(MQTTClient handle, const char* topic, MQTTProperties* props)
{
MQTTResponse rc;
rc = MQTTClient_unsubscribeMany5(handle, 1, (char * const *)(&topic), props);
return rc;
}
int MQTTClient_unsubscribe(MQTTClient handle, const char* topic)
{
MQTTResponse response = MQTTClient_unsubscribe5(handle, topic, NULL);
return response.reasonCode;
}
MQTTResponse MQTTClient_publish5(MQTTClient handle, const char* topicName, int payloadlen, const void* payload,
int qos, int retained, MQTTProperties* properties, MQTTClient_deliveryToken* deliveryToken)
{
int rc = MQTTCLIENT_SUCCESS;
MQTTClients* m = handle;
Messages* msg = NULL;
Publish* p = NULL;
int blocked = 0;
int msgid = 0;
MQTTResponse resp = MQTTResponse_initializer;
FUNC_ENTRY;
Paho_thread_lock_mutex(mqttclient_mutex);
if (m == NULL || m->c == NULL)
rc = MQTTCLIENT_FAILURE;
else if (m->c->connected == 0)
rc = MQTTCLIENT_DISCONNECTED;
else if (!UTF8_validateString(topicName))
rc = MQTTCLIENT_BAD_UTF8_STRING;
if (rc != MQTTCLIENT_SUCCESS)
goto exit;
/* If outbound queue is full, block until it is not */
while (m->c->outboundMsgs->count >= m->c->maxInflightMessages ||
Socket_noPendingWrites(m->c->net.socket) == 0) /* wait until the socket is free of large packets being written */
{
if (blocked == 0)
{
blocked = 1;
Log(TRACE_MIN, -1, "Blocking publish on queue full for client %s", m->c->clientID);
}
Paho_thread_unlock_mutex(mqttclient_mutex);
MQTTClient_yield();
Paho_thread_lock_mutex(mqttclient_mutex);
if (m->c->connected == 0)
{
rc = MQTTCLIENT_FAILURE;
goto exit;
}
}
if (blocked == 1)
Log(TRACE_MIN, -1, "Resuming publish now queue not full for client %s", m->c->clientID);
if (qos > 0 && (msgid = MQTTProtocol_assignMsgId(m->c)) == 0)
{ /* this should never happen as we've waited for spaces in the queue */
rc = MQTTCLIENT_MAX_MESSAGES_INFLIGHT;
goto exit;
}
if ((p = malloc(sizeof(Publish))) == NULL)
{
rc = PAHO_MEMORY_ERROR;
goto exit_and_free;
}
memset(p->mask, '\0', sizeof(p->mask));
p->payload = NULL;
p->payloadlen = payloadlen;
if (payloadlen > 0)
{
if ((p->payload = malloc(payloadlen)) == NULL)
{
rc = PAHO_MEMORY_ERROR;
goto exit_and_free;
}
memcpy(p->payload, payload, payloadlen);
}
if ((p->topic = MQTTStrdup(topicName)) == NULL)
{
rc = PAHO_MEMORY_ERROR;
goto exit_and_free;
}
p->msgId = msgid;
p->MQTTVersion = m->c->MQTTVersion;
if (m->c->MQTTVersion >= MQTTVERSION_5)
{
if (properties)
p->properties = *properties;
else
{
MQTTProperties props = MQTTProperties_initializer;
p->properties = props;
}
}
rc = MQTTProtocol_startPublish(m->c, p, qos, retained, &msg);
/* If the packet was partially written to the socket, wait for it to complete.
* However, if the client is disconnected during this time and qos is not 0, still return success, as
* the packet has already been written to persistence and assigned a message id so will
* be sent when the client next connects.
*/
if (rc == TCPSOCKET_INTERRUPTED)
{
while (m->c->connected == 1)
{
pending_writes* writing = NULL;
Paho_thread_lock_mutex(socket_mutex);
writing = SocketBuffer_getWrite(m->c->net.socket);
Paho_thread_unlock_mutex(socket_mutex);
if (writing == NULL)
break;
Paho_thread_unlock_mutex(mqttclient_mutex);
MQTTClient_yield();
Paho_thread_lock_mutex(mqttclient_mutex);
}
rc = (qos > 0 || m->c->connected == 1) ? MQTTCLIENT_SUCCESS : MQTTCLIENT_FAILURE;
}
if (deliveryToken && qos > 0)
*deliveryToken = msg->msgid;
exit_and_free:
if (p)
{
if (p->topic)
free(p->topic);
if (p->payload)
free(p->payload);
free(p);
}
if (rc == SOCKET_ERROR)
{
MQTTClient_disconnect_internal(handle, 0);
/* Return success for qos > 0 as the send will be retried automatically */
rc = (qos > 0) ? MQTTCLIENT_SUCCESS : MQTTCLIENT_FAILURE;
}
exit:
Paho_thread_unlock_mutex(mqttclient_mutex);
resp.reasonCode = rc;
FUNC_EXIT_RC(resp.reasonCode);
return resp;
}
int MQTTClient_publish(MQTTClient handle, const char* topicName, int payloadlen, const void* payload,
int qos, int retained, MQTTClient_deliveryToken* deliveryToken)
{
MQTTClients* m = handle;
MQTTResponse rc = MQTTResponse_initializer;
if (m->c->MQTTVersion >= MQTTVERSION_5)
rc.reasonCode = MQTTCLIENT_WRONG_MQTT_VERSION;
else
rc = MQTTClient_publish5(handle, topicName, payloadlen, payload, qos, retained, NULL, deliveryToken);
return rc.reasonCode;
}
MQTTResponse MQTTClient_publishMessage5(MQTTClient handle, const char* topicName, MQTTClient_message* message,
MQTTClient_deliveryToken* deliveryToken)
{
MQTTResponse rc = MQTTResponse_initializer;
MQTTProperties* props = NULL;
FUNC_ENTRY;
if (message == NULL)
{
rc.reasonCode = MQTTCLIENT_NULL_PARAMETER;
goto exit;
}
if (strncmp(message->struct_id, "MQTM", 4) != 0 ||
(message->struct_version != 0 && message->struct_version != 1))
{
rc.reasonCode = MQTTCLIENT_BAD_STRUCTURE;
goto exit;
}
if (message->struct_version >= 1)
props = &message->properties;
rc = MQTTClient_publish5(handle, topicName, message->payloadlen, message->payload,
message->qos, message->retained, props, deliveryToken);
exit:
FUNC_EXIT_RC(rc.reasonCode);
return rc;
}
int MQTTClient_publishMessage(MQTTClient handle, const char* topicName, MQTTClient_message* message,
MQTTClient_deliveryToken* deliveryToken)
{
MQTTClients* m = handle;
MQTTResponse rc = MQTTResponse_initializer;
if (strncmp(message->struct_id, "MQTM", 4) != 0 ||
(message->struct_version != 0 && message->struct_version != 1))
rc.reasonCode = MQTTCLIENT_BAD_STRUCTURE;
else if (m != NULL && m->c != NULL && m->c->MQTTVersion >= MQTTVERSION_5)
rc.reasonCode = MQTTCLIENT_WRONG_MQTT_VERSION;
else
rc = MQTTClient_publishMessage5(handle, topicName, message, deliveryToken);
return rc.reasonCode;
}
static void MQTTClient_retry(void)
{
static START_TIME_TYPE last = START_TIME_ZERO;
START_TIME_TYPE now;
FUNC_ENTRY;
now = MQTTTime_now();
if (MQTTTime_difftime(now, last) >= (DIFF_TIME_TYPE)(retryLoopIntervalms))
{
last = MQTTTime_now();
MQTTProtocol_keepalive(now);
MQTTProtocol_retry(now, 1, 0);
}
else
MQTTProtocol_retry(now, 0, 0);
FUNC_EXIT;
}
static MQTTPacket* MQTTClient_cycle(SOCKET* sock, ELAPSED_TIME_TYPE timeout, int* rc)
{
static Ack ack;
MQTTPacket* pack = NULL;
int rc1 = 0;
START_TIME_TYPE start;
FUNC_ENTRY;
#if defined(OPENSSL)
if ((*sock = SSLSocket_getPendingRead()) == -1)
{
/* 0 from getReadySocket indicates no work to do, rc -1 == error */
#endif
start = MQTTTime_start_clock();
*sock = Socket_getReadySocket(0, (int)timeout, socket_mutex, rc);
*rc = rc1;
if (*sock == 0 && timeout >= 100L && MQTTTime_elapsed(start) < (int64_t)10)
MQTTTime_sleep(100L);
#if defined(OPENSSL)
}
#endif
Paho_thread_lock_mutex(mqttclient_mutex);
if (*sock > 0 && rc1 == 0)
{
MQTTClients* m = NULL;
if (ListFindItem(handles, sock, clientSockCompare) != NULL)
m = (MQTTClient)(handles->current->content);
if (m != NULL)
{
if (m->c->connect_state == TCP_IN_PROGRESS || m->c->connect_state == SSL_IN_PROGRESS)
*rc = 0; /* waiting for connect state to clear */
else if (m->c->connect_state == WEBSOCKET_IN_PROGRESS)
*rc = WebSocket_upgrade(&m->c->net);
else
{
pack = MQTTPacket_Factory(m->c->MQTTVersion, &m->c->net, rc);
if (*rc == TCPSOCKET_INTERRUPTED)
*rc = 0;
}
}
if (pack)
{
int freed = 1;
/* Note that these handle... functions free the packet structure that they are dealing with */
if (pack->header.bits.type == PUBLISH)
*rc = MQTTProtocol_handlePublishes(pack, *sock);
else if (pack->header.bits.type == PUBACK || pack->header.bits.type == PUBCOMP)
{
int msgid;
ack = (pack->header.bits.type == PUBCOMP) ? *(Pubcomp*)pack : *(Puback*)pack;
msgid = ack.msgId;
if (m && m->c->MQTTVersion >= MQTTVERSION_5 && m->published)
{
Log(TRACE_MIN, -1, "Calling published for client %s, msgid %d", m->c->clientID, msgid);
(*(m->published))(m->published_context, msgid, pack->header.bits.type, &ack.properties, ack.rc);
}
*rc = (pack->header.bits.type == PUBCOMP) ?
MQTTProtocol_handlePubcomps(pack, *sock, NULL) : MQTTProtocol_handlePubacks(pack, *sock, NULL);
if (m && m->dc)
{
Log(TRACE_MIN, -1, "Calling deliveryComplete for client %s, msgid %d", m->c->clientID, msgid);
(*(m->dc))(m->context, msgid);
}
}
else if (pack->header.bits.type == PUBREC)
{
Pubrec* pubrec = (Pubrec*)pack;
if (m && m->c->MQTTVersion >= MQTTVERSION_5 && m->published && pubrec->rc >= MQTTREASONCODE_UNSPECIFIED_ERROR)
{
Log(TRACE_MIN, -1, "Calling published for client %s, msgid %d", m->c->clientID, ack.msgId);
(*(m->published))(m->published_context, pubrec->msgId, pack->header.bits.type,
&pubrec->properties, pubrec->rc);
}
*rc = MQTTProtocol_handlePubrecs(pack, *sock, NULL);
}
else if (pack->header.bits.type == PUBREL)
*rc = MQTTProtocol_handlePubrels(pack, *sock);
else if (pack->header.bits.type == PINGRESP)
*rc = MQTTProtocol_handlePingresps(pack, *sock);
else
freed = 0;
if (freed)
pack = NULL;
}
}
MQTTClient_retry();
Paho_thread_unlock_mutex(mqttclient_mutex);
FUNC_EXIT_RC(*rc);
return pack;
}
static MQTTPacket* MQTTClient_waitfor(MQTTClient handle, int packet_type, int* rc, int64_t timeout)
{
MQTTPacket* pack = NULL;
MQTTClients* m = handle;
START_TIME_TYPE start = MQTTTime_start_clock();
int is_running = 0; /* local copy of running */
FUNC_ENTRY;
if (((MQTTClients*)handle) == NULL || timeout <= 0L)
{
*rc = MQTTCLIENT_FAILURE;
goto exit;
}
Paho_thread_lock_mutex(mqttclient_mutex);
is_running = running;
Paho_thread_unlock_mutex(mqttclient_mutex);
if (is_running)
{
if (packet_type == CONNECT)
{
if ((*rc = Thread_wait_sem(m->connect_sem, (int)timeout)) == 0)
*rc = m->rc;
}
else if (packet_type == CONNACK)
*rc = Thread_wait_sem(m->connack_sem, (int)timeout);
else if (packet_type == SUBACK)
*rc = Thread_wait_sem(m->suback_sem, (int)timeout);
else if (packet_type == UNSUBACK)
*rc = Thread_wait_sem(m->unsuback_sem, (int)timeout);
if (*rc == 0 && packet_type != CONNECT && m->pack == NULL)
Log(LOG_ERROR, -1, "waitfor unexpectedly is NULL for client %s, packet_type %d, timeout %ld", m->c->clientID, packet_type, timeout);
pack = m->pack;
}
else
{
*rc = TCPSOCKET_COMPLETE;
while (1)
{
SOCKET sock = -1;
pack = MQTTClient_cycle(&sock, 100L, rc);
if (sock == m->c->net.socket)
{
if (*rc == SOCKET_ERROR)
break;
if (pack && (pack->header.bits.type == packet_type))
break;
if (m->c->connect_state == TCP_IN_PROGRESS)
{
int error;
socklen_t len = sizeof(error);
if ((*rc = getsockopt(m->c->net.socket, SOL_SOCKET, SO_ERROR, (char*)&error, &len)) == 0)
*rc = error;
break;
}
#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, sock, m->currentServerURI,
m->c->sslopts->verify, m->c->sslopts->ssl_error_cb, m->c->sslopts->ssl_error_context) :
SSLSocket_connect(m->c->net.ssl, sock, m->currentServerURI,
m->c->sslopts->verify, NULL, NULL);
if (*rc == SSL_FATAL)
break;
else if (*rc == 1) /* rc == 1 means SSL connect has finished and succeeded */
{
if ((m->c->cleansession == 0 && m->c->cleanstart == 0) && m->c->session == NULL)
m->c->session = SSL_get1_session(m->c->net.ssl);
break;
}
}
#endif
else if (m->c->connect_state == WEBSOCKET_IN_PROGRESS && *rc != TCPSOCKET_INTERRUPTED)
{
*rc = 1;
break;
}
else if (m->c->connect_state == PROXY_CONNECT_IN_PROGRESS )
{
*rc = 1;
break;
}
else if (m->c->connect_state == WAIT_FOR_CONNACK)
{
int error;
socklen_t len = sizeof(error);
if (getsockopt(m->c->net.socket, SOL_SOCKET, SO_ERROR, (char*)&error, &len) == 0)
{
if (error)
{
*rc = error;
break;
}
}
}
}
if (MQTTTime_elapsed(start) > (uint64_t)timeout)
{
pack = NULL;
break;
}
}
}
exit:
FUNC_EXIT_RC(*rc);
return pack;
}
int MQTTClient_receive(MQTTClient handle, char** topicName, int* topicLen, MQTTClient_message** message,
unsigned long timeout)
{
int rc = TCPSOCKET_COMPLETE;
START_TIME_TYPE start = MQTTTime_start_clock();
ELAPSED_TIME_TYPE elapsed = 0L;
MQTTClients* m = handle;
FUNC_ENTRY;
if (m == NULL || m->c == NULL
|| running) /* receive is not meant to be called in a multi-thread environment */
{
rc = MQTTCLIENT_FAILURE;
goto exit;
}
if (m->c->connected == 0)
{
rc = MQTTCLIENT_DISCONNECTED;
goto exit;
}
*topicName = NULL;
*message = NULL;
/* if there is already a message waiting, don't hang around but still do some packet handling */
if (m->c->messageQueue->count > 0)
timeout = 0L;
elapsed = MQTTTime_elapsed(start);
do
{
SOCKET sock = 0;
MQTTClient_cycle(&sock, (timeout > elapsed) ? timeout - elapsed : 0L, &rc);
if (rc == SOCKET_ERROR)
{
if (ListFindItem(handles, &sock, clientSockCompare) && /* find client corresponding to socket */
(MQTTClient)(handles->current->content) == handle)
break; /* there was an error on the socket we are interested in */
}
elapsed = MQTTTime_elapsed(start);
}
while (elapsed < timeout && m->c->messageQueue->count == 0);
if (m->c->messageQueue->count > 0)
rc = MQTTClient_deliverMessage(rc, m, topicName, topicLen, message);
if (rc == SOCKET_ERROR)
MQTTClient_disconnect_internal(handle, 0);
exit:
FUNC_EXIT_RC(rc);
return rc;
}
void MQTTClient_yield(void)
{
START_TIME_TYPE start = MQTTTime_start_clock();
ELAPSED_TIME_TYPE elapsed = 0L;
ELAPSED_TIME_TYPE timeout = 100L;
int rc = 0;
FUNC_ENTRY;
if (running) /* yield is not meant to be called in a multi-thread environment */
{
MQTTTime_sleep(timeout);
goto exit;
}
elapsed = MQTTTime_elapsed(start);
do
{
SOCKET sock = -1;
MQTTClient_cycle(&sock, (timeout > elapsed) ? timeout - elapsed : 0L, &rc);
Paho_thread_lock_mutex(mqttclient_mutex);
if (rc == SOCKET_ERROR && ListFindItem(handles, &sock, clientSockCompare))
{
MQTTClients* m = (MQTTClient)(handles->current->content);
if (m->c->connect_state != DISCONNECTING)
MQTTClient_disconnect_internal(m, 0);
}
Paho_thread_unlock_mutex(mqttclient_mutex);
elapsed = MQTTTime_elapsed(start);
}
while (elapsed < timeout);
exit:
FUNC_EXIT;
}
/*
static int pubCompare(void* a, void* b)
{
Messages* msg = (Messages*)a;
return msg->publish == (Publications*)b;
}*/
int MQTTClient_waitForCompletion(MQTTClient handle, MQTTClient_deliveryToken mdt, unsigned long timeout)
{
int rc = MQTTCLIENT_FAILURE;
START_TIME_TYPE start = MQTTTime_start_clock();
ELAPSED_TIME_TYPE elapsed = 0L;
MQTTClients* m = handle;
FUNC_ENTRY;
Paho_thread_lock_mutex(mqttclient_mutex);
elapsed = MQTTTime_elapsed(start);
while (elapsed < timeout)
{
if (m == NULL || m->c == NULL)
{
rc = MQTTCLIENT_FAILURE;
goto exit;
}
if (m->c->connected == 0)
{
rc = MQTTCLIENT_DISCONNECTED;
goto exit;
}
if (ListFindItem(m->c->outboundMsgs, &mdt, messageIDCompare) == NULL)
{
rc = MQTTCLIENT_SUCCESS; /* well we couldn't find it */
goto exit;
}
Paho_thread_unlock_mutex(mqttclient_mutex);
MQTTClient_yield();
Paho_thread_lock_mutex(mqttclient_mutex);
elapsed = MQTTTime_elapsed(start);
}
exit:
Paho_thread_unlock_mutex(mqttclient_mutex);
FUNC_EXIT_RC(rc);
return rc;
}
int MQTTClient_getPendingDeliveryTokens(MQTTClient handle, MQTTClient_deliveryToken **tokens)
{
int rc = MQTTCLIENT_SUCCESS;
MQTTClients* m = handle;
*tokens = NULL;
FUNC_ENTRY;
Paho_thread_lock_mutex(mqttclient_mutex);
if (m == NULL)
{
rc = MQTTCLIENT_FAILURE;
goto exit;
}
if (m->c && m->c->outboundMsgs->count > 0)
{
ListElement* current = NULL;
int count = 0;
*tokens = malloc(sizeof(MQTTClient_deliveryToken) * (m->c->outboundMsgs->count + 1));
if (!*tokens)
{
rc = PAHO_MEMORY_ERROR;
goto exit;
}
while (ListNextElement(m->c->outboundMsgs, &current))
{
Messages* m = (Messages*)(current->content);
(*tokens)[count++] = m->msgid;
}
(*tokens)[count] = -1;
}
exit:
Paho_thread_unlock_mutex(mqttclient_mutex);
FUNC_EXIT_RC(rc);
return rc;
}
void MQTTClient_setTraceLevel(enum MQTTCLIENT_TRACE_LEVELS level)
{
Log_setTraceLevel((enum LOG_LEVELS)level);
}
void MQTTClient_setTraceCallback(MQTTClient_traceCallback* callback)
{
Log_setTraceCallback((Log_traceCallback*)callback);
}
int MQTTClient_setCommandTimeout(MQTTClient handle, unsigned long milliSeconds)
{
int rc = MQTTCLIENT_SUCCESS;
MQTTClients* m = handle;
FUNC_ENTRY;
if (milliSeconds < 5000L)
rc = MQTTCLIENT_FAILURE;
else
m->commandTimeout = milliSeconds;
FUNC_EXIT_RC(rc);
return rc;
}
MQTTClient_nameValue* MQTTClient_getVersionInfo(void)
{
#define MAX_INFO_STRINGS 8
static MQTTClient_nameValue libinfo[MAX_INFO_STRINGS + 1];
int i = 0;
libinfo[i].name = "Product name";
libinfo[i++].value = "Eclipse Paho Synchronous MQTT C Client Library";
libinfo[i].name = "Version";
libinfo[i++].value = CLIENT_VERSION;
libinfo[i].name = "Build level";
libinfo[i++].value = BUILD_TIMESTAMP;
#if defined(OPENSSL)
libinfo[i].name = "OpenSSL version";
libinfo[i++].value = SSLeay_version(SSLEAY_VERSION);
libinfo[i].name = "OpenSSL flags";
libinfo[i++].value = SSLeay_version(SSLEAY_CFLAGS);
libinfo[i].name = "OpenSSL build timestamp";
libinfo[i++].value = SSLeay_version(SSLEAY_BUILT_ON);
libinfo[i].name = "OpenSSL platform";
libinfo[i++].value = SSLeay_version(SSLEAY_PLATFORM);
libinfo[i].name = "OpenSSL directory";
libinfo[i++].value = SSLeay_version(SSLEAY_DIR);
#endif
libinfo[i].name = NULL;
libinfo[i].value = NULL;
return libinfo;
}
const char* MQTTClient_strerror(int code)
{
static char buf[30];
int chars = 0;
switch (code) {
case MQTTCLIENT_SUCCESS:
return "Success";
case MQTTCLIENT_FAILURE:
return "Failure";
case MQTTCLIENT_DISCONNECTED:
return "Disconnected";
case MQTTCLIENT_MAX_MESSAGES_INFLIGHT:
return "Maximum in-flight messages amount reached";
case MQTTCLIENT_BAD_UTF8_STRING:
return "Invalid UTF8 string";
case MQTTCLIENT_NULL_PARAMETER:
return "Invalid (NULL) parameter";
case MQTTCLIENT_TOPICNAME_TRUNCATED:
return "Topic containing NULL characters has been truncated";
case MQTTCLIENT_BAD_STRUCTURE:
return "Bad structure";
case MQTTCLIENT_BAD_QOS:
return "Invalid QoS value";
case MQTTCLIENT_SSL_NOT_SUPPORTED:
return "SSL is not supported";
case MQTTCLIENT_BAD_MQTT_VERSION:
return "Unrecognized MQTT version";
case MQTTCLIENT_BAD_PROTOCOL:
return "Invalid protocol scheme";
case MQTTCLIENT_BAD_MQTT_OPTION:
return "Options for wrong MQTT version";
case MQTTCLIENT_WRONG_MQTT_VERSION:
return "Client created for another version of MQTT";
case MQTTCLIENT_0_LEN_WILL_TOPIC:
return "Zero length will topic on connect";
}
chars = snprintf(buf, sizeof(buf), "Unknown error code %d", code);
if (chars >= sizeof(buf))
{
buf[sizeof(buf)-1] = '\0';
Log(LOG_ERROR, 0, "Error writing %d chars with snprintf", chars);
}
return buf;
}
/**
* See if any pending writes have been completed, and cleanup if so.
* Cleaning up means removing any publication data that was stored because the write did
* not originally complete.
*/
static void MQTTProtocol_checkPendingWrites(void)
{
FUNC_ENTRY;
if (state.pending_writes.count > 0)
{
ListElement* le = state.pending_writes.first;
while (le)
{
if (Socket_noPendingWrites(((pending_write*)(le->content))->socket))
{
MQTTProtocol_removePublication(((pending_write*)(le->content))->p);
state.pending_writes.current = le;
ListRemove(&(state.pending_writes), le->content); /* does NextElement itself */
le = state.pending_writes.current;
}
else
ListNextElement(&(state.pending_writes), &le);
}
}
FUNC_EXIT;
}
static void MQTTClient_writeComplete(SOCKET socket, int rc)
{
ListElement* found = NULL;
FUNC_ENTRY;
/* a partial write is now complete for a socket - this will be on a publish*/
MQTTProtocol_checkPendingWrites();
/* find the client using this socket */
if ((found = ListFindItem(handles, &socket, clientSockCompare)) != NULL)
{
MQTTClients* m = (MQTTClients*)(found->content);
m->c->net.lastSent = MQTTTime_now();
}
FUNC_EXIT;
}
static void MQTTClient_writeContinue(SOCKET socket)
{
ListElement* found = NULL;
if ((found = ListFindItem(handles, &socket, clientSockCompare)) != NULL)
{
MQTTClients* m = (MQTTClients*)(found->content);
m->c->net.lastSent = MQTTTime_now();
}
}
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