static void _sys_update_memory(struct mosquitto_db *db, char *buf)
{
static unsigned long current_heap = -1;
static unsigned long max_heap = -1;
unsigned long value_ul;
value_ul = _mosquitto_memory_used();
if(current_heap != value_ul){
current_heap = value_ul;
snprintf(buf, BUFLEN, "%lu", current_heap);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/heap/current size", 2, strlen(buf), buf, 1);
}
value_ul =_mosquitto_max_memory_used();
if(max_heap != value_ul){
max_heap = value_ul;
snprintf(buf, BUFLEN, "%lu", max_heap);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/heap/maximum size", 2, strlen(buf), buf, 1);
}
}
static void calc_load(struct mosquitto_db *db, char *buf, const char *topic, double exponent, double interval, double *current)
{
double new_value;
new_value = interval + exponent*((*current) - interval);
if(fabs(new_value - (*current)) >= 0.01){
snprintf(buf, BUFLEN, "%.2f", new_value);
mqtt3_db_messages_easy_queue(db, NULL, topic, 2, strlen(buf), buf, 1);
}
(*current) = new_value;
}
static void _sys_update_clients(struct mosquitto_db *db, char *buf)
{
static unsigned int client_count = -1;
static int clients_expired = -1;
static unsigned int client_max = -1;
static unsigned int inactive_count = -1;
static unsigned int active_count = -1;
unsigned int value;
unsigned int inactive;
unsigned int active;
if(!mqtt3_db_client_count(db, &value, &inactive)){
if(client_count != value){
client_count = value;
snprintf(buf, BUFLEN, "%d", client_count);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/clients/total", 2, strlen(buf), buf, 1);
}
if(inactive_count != inactive){
inactive_count = inactive;
snprintf(buf, BUFLEN, "%d", inactive_count);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/clients/inactive", 2, strlen(buf), buf, 1);
}
active = client_count - inactive;
if(active_count != active){
active_count = active;
snprintf(buf, BUFLEN, "%d", active_count);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/clients/active", 2, strlen(buf), buf, 1);
}
if(value != client_max){
client_max = value;
snprintf(buf, BUFLEN, "%d", client_max);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/clients/maximum", 2, strlen(buf), buf, 1);
}
}
if(g_clients_expired != clients_expired){
clients_expired = g_clients_expired;
snprintf(buf, BUFLEN, "%d", clients_expired);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/clients/expired", 2, strlen(buf), buf, 1);
}
}
void mqtt3_context_disconnect(struct mosquitto_db *db, struct mosquitto *ctxt)
{
if(ctxt->state != mosq_cs_disconnecting && ctxt->will){
if(mosquitto_acl_check(db, ctxt, ctxt->will->topic, MOSQ_ACL_WRITE) == MOSQ_ERR_SUCCESS){
/* Unexpected disconnect, queue the client will. */
mqtt3_db_messages_easy_queue(db, ctxt, ctxt->will->topic, ctxt->will->qos, ctxt->will->payloadlen, ctxt->will->payload, ctxt->will->retain);
}
}
if(ctxt->will){
if(ctxt->will->topic) _mosquitto_free(ctxt->will->topic);
if(ctxt->will->payload) _mosquitto_free(ctxt->will->payload);
_mosquitto_free(ctxt->will);
ctxt->will = NULL;
}
ctxt->disconnect_t = time(NULL);
_mosquitto_socket_close(db, ctxt);
}
void mqtt3_context_disconnect(struct mosquitto_db *db, struct mosquitto *ctxt)
{
if(ctxt->state != mosq_cs_disconnecting && ctxt->will){
/* Unexpected disconnect, queue the client will. */
mqtt3_db_messages_easy_queue(db, ctxt, ctxt->will->topic, ctxt->will->qos, ctxt->will->payloadlen, ctxt->will->payload, ctxt->will->retain);
}
if(ctxt->will){
if(ctxt->will->topic) _mosquitto_free(ctxt->will->topic);
if(ctxt->will->payload) _mosquitto_free(ctxt->will->payload);
_mosquitto_free(ctxt->will);
ctxt->will = NULL;
}
if(ctxt->listener){
ctxt->listener->client_count--;
assert(ctxt->listener->client_count >= 0);
ctxt->listener = NULL;
}
ctxt->disconnect_t = mosquitto_time();
_mosquitto_socket_close(ctxt);
}
static void _sys_update_clients(struct mosquitto_db *db, char *buf)
{
static unsigned int client_count = -1;
static int clients_expired = -1;
static unsigned int client_max = -1;
static unsigned int disconnected_count = -1;
static unsigned int connected_count = -1;
if(client_count != db->connected_count + db->disconnected_count){
client_count = db->connected_count + db->disconnected_count;
snprintf(buf, BUFLEN, "%d", client_count);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/clients/total", 2, strlen(buf), buf, 1);
if(client_count > client_max){
client_max = client_count;
snprintf(buf, BUFLEN, "%d", client_max);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/clients/maximum", 2, strlen(buf), buf, 1);
}
}
if(disconnected_count != db->disconnected_count){
disconnected_count = db->disconnected_count;
snprintf(buf, BUFLEN, "%d", disconnected_count);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/clients/inactive", 2, strlen(buf), buf, 1);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/clients/disconnected", 2, strlen(buf), buf, 1);
}
if(connected_count != db->connected_count){
connected_count = db->connected_count;
snprintf(buf, BUFLEN, "%d", connected_count);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/clients/active", 2, strlen(buf), buf, 1);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/clients/connected", 2, strlen(buf), buf, 1);
}
if(g_clients_expired != clients_expired){
clients_expired = g_clients_expired;
snprintf(buf, BUFLEN, "%d", clients_expired);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/clients/expired", 2, strlen(buf), buf, 1);
}
}
/* Send messages for the $SYS hierarchy if the last update is longer than
* 'interval' seconds ago.
* 'interval' is the amount of seconds between updates. If 0, then no periodic
* messages are sent for the $SYS hierarchy.
* 'start_time' is the result of time() that the broker was started at.
*/
void mqtt3_db_sys_update(struct mosquitto_db *db, int interval, time_t start_time)
{
static time_t last_update = 0;
time_t now;
time_t uptime;
char buf[BUFLEN];
static int msg_store_count = -1;
static unsigned long msgs_received = -1;
static unsigned long msgs_sent = -1;
static unsigned long publish_dropped = -1;
static unsigned long pub_msgs_received = -1;
static unsigned long pub_msgs_sent = -1;
static unsigned long long bytes_received = -1;
static unsigned long long bytes_sent = -1;
static unsigned long long pub_bytes_received = -1;
static unsigned long long pub_bytes_sent = -1;
static int subscription_count = -1;
static int retained_count = -1;
static double msgs_received_load1 = 0;
static double msgs_received_load5 = 0;
static double msgs_received_load15 = 0;
static double msgs_sent_load1 = 0;
static double msgs_sent_load5 = 0;
static double msgs_sent_load15 = 0;
static double publish_dropped_load1 = 0;
static double publish_dropped_load5 = 0;
static double publish_dropped_load15 = 0;
double msgs_received_interval, msgs_sent_interval, publish_dropped_interval;
static double publish_received_load1 = 0;
static double publish_received_load5 = 0;
static double publish_received_load15 = 0;
static double publish_sent_load1 = 0;
static double publish_sent_load5 = 0;
static double publish_sent_load15 = 0;
double publish_received_interval, publish_sent_interval;
static double bytes_received_load1 = 0;
static double bytes_received_load5 = 0;
static double bytes_received_load15 = 0;
static double bytes_sent_load1 = 0;
static double bytes_sent_load5 = 0;
static double bytes_sent_load15 = 0;
double bytes_received_interval, bytes_sent_interval;
static double socket_load1 = 0;
static double socket_load5 = 0;
static double socket_load15 = 0;
double socket_interval;
static double connection_load1 = 0;
static double connection_load5 = 0;
static double connection_load15 = 0;
double connection_interval;
double exponent;
double i_mult;
now = mosquitto_time();
if(interval && now - interval > last_update){
uptime = now - start_time;
snprintf(buf, BUFLEN, "%d seconds", (int)uptime);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/uptime", 2, strlen(buf), buf, 1);
_sys_update_clients(db, buf);
if(last_update > 0){
i_mult = 60.0/(double)(now-last_update);
msgs_received_interval = (g_msgs_received - msgs_received)*i_mult;
msgs_sent_interval = (g_msgs_sent - msgs_sent)*i_mult;
publish_dropped_interval = (g_msgs_dropped - publish_dropped)*i_mult;
publish_received_interval = (g_pub_msgs_received - pub_msgs_received)*i_mult;
publish_sent_interval = (g_pub_msgs_sent - pub_msgs_sent)*i_mult;
bytes_received_interval = (g_bytes_received - bytes_received)*i_mult;
bytes_sent_interval = (g_bytes_sent - bytes_sent)*i_mult;
socket_interval = g_socket_connections*i_mult;
g_socket_connections = 0;
connection_interval = g_connection_count*i_mult;
g_connection_count = 0;
/* 1 minute load */
exponent = exp(-1.0*(now-last_update)/60.0);
calc_load(db, buf, "$SYS/broker/load/messages/received/1min", exponent, msgs_received_interval, &msgs_received_load1);
calc_load(db, buf, "$SYS/broker/load/messages/sent/1min", exponent, msgs_sent_interval, &msgs_sent_load1);
calc_load(db, buf, "$SYS/broker/load/publish/dropped/1min", exponent, publish_dropped_interval, &publish_dropped_load1);
calc_load(db, buf, "$SYS/broker/load/publish/received/1min", exponent, publish_received_interval, &publish_received_load1);
calc_load(db, buf, "$SYS/broker/load/publish/sent/1min", exponent, publish_sent_interval, &publish_sent_load1);
calc_load(db, buf, "$SYS/broker/load/bytes/received/1min", exponent, bytes_received_interval, &bytes_received_load1);
calc_load(db, buf, "$SYS/broker/load/bytes/sent/1min", exponent, bytes_sent_interval, &bytes_sent_load1);
calc_load(db, buf, "$SYS/broker/load/sockets/1min", exponent, socket_interval, &socket_load1);
calc_load(db, buf, "$SYS/broker/load/connections/1min", exponent, connection_interval, &connection_load1);
/* 5 minute load */
exponent = exp(-1.0*(now-last_update)/300.0);
calc_load(db, buf, "$SYS/broker/load/messages/received/5min", exponent, msgs_received_interval, &msgs_received_load5);
calc_load(db, buf, "$SYS/broker/load/messages/sent/5min", exponent, msgs_sent_interval, &msgs_sent_load5);
calc_load(db, buf, "$SYS/broker/load/publish/dropped/5min", exponent, publish_dropped_interval, &publish_dropped_load5);
calc_load(db, buf, "$SYS/broker/load/publish/received/5min", exponent, publish_received_interval, &publish_received_load5);
calc_load(db, buf, "$SYS/broker/load/publish/sent/5min", exponent, publish_sent_interval, &publish_sent_load5);
calc_load(db, buf, "$SYS/broker/load/bytes/received/5min", exponent, bytes_received_interval, &bytes_received_load5);
calc_load(db, buf, "$SYS/broker/load/bytes/sent/5min", exponent, bytes_sent_interval, &bytes_sent_load5);
calc_load(db, buf, "$SYS/broker/load/sockets/5min", exponent, socket_interval, &socket_load5);
calc_load(db, buf, "$SYS/broker/load/connections/5min", exponent, connection_interval, &connection_load5);
/* 15 minute load */
exponent = exp(-1.0*(now-last_update)/900.0);
calc_load(db, buf, "$SYS/broker/load/messages/received/15min", exponent, msgs_received_interval, &msgs_received_load15);
calc_load(db, buf, "$SYS/broker/load/messages/sent/15min", exponent, msgs_sent_interval, &msgs_sent_load15);
calc_load(db, buf, "$SYS/broker/load/publish/dropped/15min", exponent, publish_dropped_interval, &publish_dropped_load15);
calc_load(db, buf, "$SYS/broker/load/publish/received/15min", exponent, publish_received_interval, &publish_received_load15);
calc_load(db, buf, "$SYS/broker/load/publish/sent/15min", exponent, publish_sent_interval, &publish_sent_load15);
calc_load(db, buf, "$SYS/broker/load/bytes/received/15min", exponent, bytes_received_interval, &bytes_received_load15);
calc_load(db, buf, "$SYS/broker/load/bytes/sent/15min", exponent, bytes_sent_interval, &bytes_sent_load15);
calc_load(db, buf, "$SYS/broker/load/sockets/15min", exponent, socket_interval, &socket_load15);
calc_load(db, buf, "$SYS/broker/load/connections/15min", exponent, connection_interval, &connection_load15);
}
if(db->msg_store_count != msg_store_count){
msg_store_count = db->msg_store_count;
snprintf(buf, BUFLEN, "%d", msg_store_count);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/messages/stored", 2, strlen(buf), buf, 1);
}
if(db->subscription_count != subscription_count){
subscription_count = db->subscription_count;
snprintf(buf, BUFLEN, "%d", subscription_count);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/subscriptions/count", 2, strlen(buf), buf, 1);
}
if(db->retained_count != retained_count){
retained_count = db->retained_count;
snprintf(buf, BUFLEN, "%d", retained_count);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/retained messages/count", 2, strlen(buf), buf, 1);
}
#ifdef REAL_WITH_MEMORY_TRACKING
_sys_update_memory(db, buf);
#endif
if(msgs_received != g_msgs_received){
msgs_received = g_msgs_received;
snprintf(buf, BUFLEN, "%lu", msgs_received);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/messages/received", 2, strlen(buf), buf, 1);
}
if(msgs_sent != g_msgs_sent){
msgs_sent = g_msgs_sent;
snprintf(buf, BUFLEN, "%lu", msgs_sent);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/messages/sent", 2, strlen(buf), buf, 1);
}
if(publish_dropped != g_msgs_dropped){
publish_dropped = g_msgs_dropped;
snprintf(buf, BUFLEN, "%lu", publish_dropped);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/publish/messages/dropped", 2, strlen(buf), buf, 1);
}
if(pub_msgs_received != g_pub_msgs_received){
pub_msgs_received = g_pub_msgs_received;
snprintf(buf, BUFLEN, "%lu", pub_msgs_received);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/publish/messages/received", 2, strlen(buf), buf, 1);
}
if(pub_msgs_sent != g_pub_msgs_sent){
pub_msgs_sent = g_pub_msgs_sent;
snprintf(buf, BUFLEN, "%lu", pub_msgs_sent);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/publish/messages/sent", 2, strlen(buf), buf, 1);
}
if(bytes_received != g_bytes_received){
bytes_received = g_bytes_received;
snprintf(buf, BUFLEN, "%llu", bytes_received);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/bytes/received", 2, strlen(buf), buf, 1);
}
if(bytes_sent != g_bytes_sent){
bytes_sent = g_bytes_sent;
snprintf(buf, BUFLEN, "%llu", bytes_sent);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/bytes/sent", 2, strlen(buf), buf, 1);
}
if(pub_bytes_received != g_pub_bytes_received){
pub_bytes_received = g_pub_bytes_received;
snprintf(buf, BUFLEN, "%llu", pub_bytes_received);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/publish/bytes/received", 2, strlen(buf), buf, 1);
}
if(pub_bytes_sent != g_pub_bytes_sent){
pub_bytes_sent = g_pub_bytes_sent;
snprintf(buf, BUFLEN, "%llu", pub_bytes_sent);
mqtt3_db_messages_easy_queue(db, NULL, "$SYS/broker/publish/bytes/sent", 2, strlen(buf), buf, 1);
}
last_update = mosquitto_time();
} // 大于interval了，就更新订阅信息
}
int mqtt3_bridge_connect(struct mosquitto_db *db, struct mosquitto *context)
{
int rc;
int i;
char *notification_topic;
int notification_topic_len;
uint8_t notification_payload;
if(!context || !context->bridge) return MOSQ_ERR_INVAL;
context->state = mosq_cs_new;
context->sock = INVALID_SOCKET;
context->last_msg_in = mosquitto_time();
context->next_msg_out = mosquitto_time() + context->bridge->keepalive;
context->keepalive = context->bridge->keepalive;
context->clean_session = context->bridge->clean_session;
context->in_packet.payload = NULL;
context->ping_t = 0;
context->bridge->lazy_reconnect = false;
mqtt3_bridge_packet_cleanup(context);
mqtt3_db_message_reconnect_reset(db, context);
if(context->clean_session){
mqtt3_db_messages_delete(db, context);
}
/* Delete all local subscriptions even for clean_session==false. We don't
* remove any messages and the next loop carries out the resubscription
* anyway. This means any unwanted subs will be removed.
*/
mqtt3_subs_clean_session(db, context);
for(i=0; i<context->bridge->topic_count; i++){
if(context->bridge->topics[i].direction == bd_out || context->bridge->topics[i].direction == bd_both){
_mosquitto_log_printf(NULL, MOSQ_LOG_DEBUG, "Bridge %s doing local SUBSCRIBE on topic %s", context->id, context->bridge->topics[i].local_topic);
if(mqtt3_sub_add(db, context, context->bridge->topics[i].local_topic, context->bridge->topics[i].qos, &db->subs)) return 1;
}
}
if(context->bridge->notifications){
if(context->bridge->notification_topic){
if(!context->bridge->initial_notification_done){
notification_payload = '0';
mqtt3_db_messages_easy_queue(db, context, context->bridge->notification_topic, 1, 1, ¬ification_payload, 1);
context->bridge->initial_notification_done = true;
}
notification_payload = '0';
rc = _mosquitto_will_set(context, context->bridge->notification_topic, 1, ¬ification_payload, 1, true);
if(rc != MOSQ_ERR_SUCCESS){
return rc;
}
}else{
notification_topic_len = strlen(context->bridge->remote_clientid)+strlen("$SYS/broker/connection//state");
notification_topic = _mosquitto_malloc(sizeof(char)*(notification_topic_len+1));
if(!notification_topic) return MOSQ_ERR_NOMEM;
snprintf(notification_topic, notification_topic_len+1, "$SYS/broker/connection/%s/state", context->bridge->remote_clientid);
if(!context->bridge->initial_notification_done){
notification_payload = '0';
mqtt3_db_messages_easy_queue(db, context, notification_topic, 1, 1, ¬ification_payload, 1);
context->bridge->initial_notification_done = true;
}
notification_payload = '0';
rc = _mosquitto_will_set(context, notification_topic, 1, ¬ification_payload, 1, true);
_mosquitto_free(notification_topic);
if(rc != MOSQ_ERR_SUCCESS){
return rc;
}
}
}
_mosquitto_log_printf(NULL, MOSQ_LOG_NOTICE, "Connecting bridge %s (%s:%d)", context->bridge->name, context->bridge->addresses[context->bridge->cur_address].address, context->bridge->addresses[context->bridge->cur_address].port);
rc = _mosquitto_socket_connect(context, context->bridge->addresses[context->bridge->cur_address].address, context->bridge->addresses[context->bridge->cur_address].port, NULL, false);
if(rc > 0 ){
if(rc == MOSQ_ERR_TLS){
_mosquitto_socket_close(db, context);
return rc; /* Error already printed */
}else if(rc == MOSQ_ERR_ERRNO){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", strerror(errno));
}else if(rc == MOSQ_ERR_EAI){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", gai_strerror(errno));
}
return rc;
}
HASH_ADD(hh_sock, db->contexts_by_sock, sock, sizeof(context->sock), context);
if(rc == MOSQ_ERR_CONN_PENDING){
context->state = mosq_cs_connect_pending;
}
rc = _mosquitto_send_connect(context, context->keepalive, context->clean_session);
if(rc == MOSQ_ERR_SUCCESS){
return MOSQ_ERR_SUCCESS;
}else if(rc == MOSQ_ERR_ERRNO && errno == ENOTCONN){
return MOSQ_ERR_SUCCESS;
}else{
if(rc == MOSQ_ERR_TLS){
return rc; /* Error already printed */
}else if(rc == MOSQ_ERR_ERRNO){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", strerror(errno));
}else if(rc == MOSQ_ERR_EAI){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", gai_strerror(errno));
}
_mosquitto_socket_close(db, context);
return rc;
}
}
int mqtt3_bridge_connect(struct mosquitto_db *db, struct mosquitto *context)
{
int rc;
int i;
char *notification_topic;
int notification_topic_len;
uint8_t notification_payload;
if(!context || !context->bridge) return MOSQ_ERR_INVAL;
context->state = mosq_cs_new;
context->sock = -1;
context->last_msg_in = mosquitto_time();
context->last_msg_out = mosquitto_time();
context->keepalive = context->bridge->keepalive;
context->clean_session = context->bridge->clean_session;
context->in_packet.payload = NULL;
context->ping_t = 0;
context->bridge->lazy_reconnect = false;
mqtt3_bridge_packet_cleanup(context);
mqtt3_db_message_reconnect_reset(context);
if(context->clean_session){
mqtt3_db_messages_delete(context);
}
rc = mosquitto_unpwd_check(db, context->bridge->local_username, context->bridge->local_password);
switch(rc){
case MOSQ_ERR_SUCCESS:
break;
case MOSQ_ERR_AUTH:
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Bridge %s failed authentication on local broker.", context->id);
return rc;
case MOSQ_ERR_UNKNOWN:
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Bridge %s returned application error in authorisation.", context->id);
return rc;
default:
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Unknown error in authentication for bridge %s.", context->id);
return rc;
}
/* Delete all local subscriptions even for clean_session==false. We don't
* remove any messages and the next loop carries out the resubscription
* anyway. This means any unwanted subs will be removed.
*/
mqtt3_subs_clean_session(db, context, &db->subs);
for(i=0; i<context->bridge->topic_count; i++){
if(context->bridge->topics[i].direction == bd_out || context->bridge->topics[i].direction == bd_both){
_mosquitto_log_printf(NULL, MOSQ_LOG_DEBUG, "Bridge %s doing local SUBSCRIBE on topic %s", context->id, context->bridge->topics[i].local_topic);
if(mqtt3_sub_add(db, context, context->bridge->topics[i].local_topic, context->bridge->topics[i].qos, &db->subs)) return 1;
}
}
if(context->bridge->notifications){
notification_payload = '0';
if(context->bridge->notification_topic){
mqtt3_db_messages_easy_queue(db, context, context->bridge->notification_topic, 1, 1, ¬ification_payload, 1);
rc = _mosquitto_will_set(context, context->bridge->notification_topic, 1, ¬ification_payload, 1, true);
if(rc != MOSQ_ERR_SUCCESS){
return rc;
}
}else{
notification_topic_len = strlen(context->id)+strlen("$SYS/broker/connection//state");
notification_topic = _mosquitto_malloc(sizeof(char)*(notification_topic_len+1));
if(!notification_topic) return MOSQ_ERR_NOMEM;
snprintf(notification_topic, notification_topic_len+1, "$SYS/broker/connection/%s/state", context->id);
mqtt3_db_messages_easy_queue(db, context, notification_topic, 1, 1, ¬ification_payload, 1);
rc = _mosquitto_will_set(context, notification_topic, 1, ¬ification_payload, 1, true);
if(rc != MOSQ_ERR_SUCCESS){
_mosquitto_free(notification_topic);
return rc;
}
_mosquitto_free(notification_topic);
}
}
_mosquitto_log_printf(NULL, MOSQ_LOG_NOTICE, "Connecting bridge %s (%s:%d)", context->bridge->name, context->bridge->addresses[context->bridge->cur_address].address, context->bridge->addresses[context->bridge->cur_address].port);
rc = _mosquitto_socket_connect(context, context->bridge->addresses[context->bridge->cur_address].address, context->bridge->addresses[context->bridge->cur_address].port, NULL, true);
if(rc != MOSQ_ERR_SUCCESS){
if(rc == MOSQ_ERR_TLS){
return rc; /* Error already printed */
}else if(rc == MOSQ_ERR_ERRNO){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", strerror(errno));
}else if(rc == MOSQ_ERR_EAI){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", gai_strerror(errno));
}
return rc;
}
rc = _mosquitto_send_connect(context, context->keepalive, context->clean_session);
if(rc == MOSQ_ERR_SUCCESS){
return MOSQ_ERR_SUCCESS;
}else if(rc == MOSQ_ERR_ERRNO && errno == ENOTCONN){
return MOSQ_ERR_SUCCESS;
}else{
if(rc == MOSQ_ERR_TLS){
return rc; /* Error already printed */
}else if(rc == MOSQ_ERR_ERRNO){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", strerror(errno));
}else if(rc == MOSQ_ERR_EAI){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", gai_strerror(errno));
}
_mosquitto_socket_close(context);
return rc;
}
}
/* 整个.c文件就是处理客户端的连接请求，返回一个连接确认包 */
int mqtt3_handle_connack(struct mosquitto_db *db, struct mosquitto *context)
{
uint8_t byte;
uint8_t rc;
int i;
char *notification_topic;
int notification_topic_len;
char notification_payload;
if(!context){
return MOSQ_ERR_INVAL;
}
#ifdef WITH_STRICT_PROTOCOL
if(context->in_packet.remaining_length != 2){
return MOSQ_ERR_PROTOCOL;
}
#endif
_mosquitto_log_printf(NULL, MOSQ_LOG_DEBUG, "Received CONNACK on connection %s.", context->id);
if(_mosquitto_read_byte(&context->in_packet, &byte)) return 1; // Reserved byte, not used
if(_mosquitto_read_byte(&context->in_packet, &rc)) return 1;
switch(rc){
//
case CONNACK_ACCEPTED:
// 这是一个broker客户端
if(context->bridge){
// 提醒机制是怎么做的？
if(context->bridge->notifications){
notification_payload = '1';
if(context->bridge->notification_topic){
if(_mosquitto_send_real_publish(context, _mosquitto_mid_generate(context),
context->bridge->notification_topic, 1, ¬ification_payload, 1, true, 0)){
return 1;
}
mqtt3_db_messages_easy_queue(db, context, context->bridge->notification_topic, 1, 1, ¬ification_payload, 1);
}else{
notification_topic_len = strlen(context->id)+strlen("$SYS/broker/connection//state");
notification_topic = _mosquitto_malloc(sizeof(char)*(notification_topic_len+1));
if(!notification_topic) return MOSQ_ERR_NOMEM;
snprintf(notification_topic, notification_topic_len+1, "$SYS/broker/connection/%s/state", context->id);
notification_payload = '1';
if(_mosquitto_send_real_publish(context, _mosquitto_mid_generate(context),
notification_topic, 1, ¬ification_payload, 1, true, 0)){
_mosquitto_free(notification_topic);
return 1;
}
mqtt3_db_messages_easy_queue(db, context, notification_topic, 1, 1, ¬ification_payload, 1);
_mosquitto_free(notification_topic);
}
}// end of bridge notifications
// broker之间的订阅处理机制，画个图可能好理解点
for(i=0; i<context->bridge->topic_count; i++){
if(context->bridge->topics[i].direction == bd_in || context->bridge->topics[i].direction == bd_both){
if(_mosquitto_send_subscribe(context, NULL, false, context->bridge->topics[i].remote_topic, context->bridge->topics[i].qos)){
return 1;
}
}else{
if(_mosquitto_send_unsubscribe(context, NULL, false, context->bridge->topics[i].remote_topic)){
/* direction = inwards only. This means we should not be subscribed
* to the topic. It is possible that we used to be subscribed to
* this topic so unsubscribe. */
return 1;
}
}
}
}
// 原来更新的是客户端的额状态
context->state = mosq_cs_connected;
return MOSQ_ERR_SUCCESS;
// 连接错误，版本问题
case CONNACK_REFUSED_PROTOCOL_VERSION:
if(context->bridge){
context->bridge->try_private_accepted = false;
}
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Connection Refused: unacceptable protocol version");
return 1;
//
case CONNACK_REFUSED_IDENTIFIER_REJECTED:
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Connection Refused: identifier rejected");
return 1;
//
case CONNACK_REFUSED_SERVER_UNAVAILABLE:
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Connection Refused: broker unavailable");
return 1;
//
case CONNACK_REFUSED_BAD_USERNAME_PASSWORD:
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Connection Refused: broker unavailable");
return 1;
//
case CONNACK_REFUSED_NOT_AUTHORIZED:
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Connection Refused: not authorised");
return 1;
//
default:
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Connection Refused: unknown reason");
return 1;
}
return 1;
}
int main(int argc, char *argv[])
{
int *listensock = NULL;
int listensock_count = 0;
int listensock_index = 0;
struct mqtt3_config config;
char buf[1024];
int i, j;
FILE *pid;
int listener_max;
int rc;
char err[256];
#ifdef WIN32
SYSTEMTIME st;
#else
struct timeval tv;
#endif
#if defined(WIN32) || defined(__CYGWIN__)
if(argc == 2){
if(!strcmp(argv[1], "run")){
service_run();
return 0;
}else if(!strcmp(argv[1], "install")){
service_install();
return 0;
}else if(!strcmp(argv[1], "uninstall")){
service_uninstall();
return 0;
}
}
#endif
#ifdef WIN32
GetSystemTime(&st);
srand(st.wSecond + st.wMilliseconds);
#else
gettimeofday(&tv, NULL);
srand(tv.tv_sec + tv.tv_usec);
#endif
memset(&int_db, 0, sizeof(struct mosquitto_db));
_mosquitto_net_init();
mqtt3_config_init(&config);
rc = mqtt3_config_parse_args(&config, argc, argv);
if(rc != MOSQ_ERR_SUCCESS) return rc;
int_db.config = &config;
if(config.daemon){
#ifndef WIN32
switch(fork()){
case 0:
break;
case -1:
strerror_r(errno, err, 256);
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error in fork: %s", err);
return 1;
default:
return MOSQ_ERR_SUCCESS;
}
#else
_mosquitto_log_printf(NULL, MOSQ_LOG_WARNING, "Warning: Can't start in daemon mode in Windows.");
#endif
}
if(config.daemon && config.pid_file){
pid = _mosquitto_fopen(config.pid_file, "wt");
if(pid){
fprintf(pid, "%d", getpid());
fclose(pid);
}else{
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error: Unable to write pid file.");
return 1;
}
}
rc = drop_privileges(&config);
if(rc != MOSQ_ERR_SUCCESS) return rc;
rc = mqtt3_db_open(&config, &int_db);
if(rc != MOSQ_ERR_SUCCESS){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error: Couldn't open database.");
return rc;
}
/* Initialise logging only after initialising the database in case we're
* logging to topics */
mqtt3_log_init(config.log_type, config.log_dest);
_mosquitto_log_printf(NULL, MOSQ_LOG_INFO, "mosquitto version %s (build date %s) starting", VERSION, TIMESTAMP);
if(config.config_file){
_mosquitto_log_printf(NULL, MOSQ_LOG_INFO, "Config loaded from %s.", config.config_file);
}else{
_mosquitto_log_printf(NULL, MOSQ_LOG_INFO, "Using default config.");
}
rc = mosquitto_security_module_init(&int_db);
if(rc) return rc;
rc = mosquitto_security_init(&int_db, false);
if(rc) return rc;
#ifdef WITH_SYS_TREE
if(config.sys_interval > 0){
/* Set static $SYS messages */
snprintf(buf, 1024, "mosquitto version %s", VERSION);
mqtt3_db_messages_easy_queue(&int_db, NULL, "$SYS/broker/version", 2, strlen(buf), buf, 1);
snprintf(buf, 1024, "%s", TIMESTAMP);
mqtt3_db_messages_easy_queue(&int_db, NULL, "$SYS/broker/timestamp", 2, strlen(buf), buf, 1);
#ifdef CHANGESET
snprintf(buf, 1024, "%s", CHANGESET);
mqtt3_db_messages_easy_queue(&int_db, NULL, "$SYS/broker/changeset", 2, strlen(buf), buf, 1);
#endif
}
#endif
listener_max = -1;
listensock_index = 0;
for(i=0; i<config.listener_count; i++){
if(mqtt3_socket_listen(&config.listeners[i])){
_mosquitto_free(int_db.contexts);
mqtt3_db_close(&int_db);
if(config.pid_file){
remove(config.pid_file);
}
return 1;
}
listensock_count += config.listeners[i].sock_count;
listensock = _mosquitto_realloc(listensock, sizeof(int)*listensock_count);
if(!listensock){
_mosquitto_free(int_db.contexts);
mqtt3_db_close(&int_db);
if(config.pid_file){
remove(config.pid_file);
}
return 1;
}
for(j=0; j<config.listeners[i].sock_count; j++){
if(config.listeners[i].socks[j] == INVALID_SOCKET){
_mosquitto_free(int_db.contexts);
mqtt3_db_close(&int_db);
if(config.pid_file){
remove(config.pid_file);
}
return 1;
}
listensock[listensock_index] = config.listeners[i].socks[j];
if(listensock[listensock_index] > listener_max){
listener_max = listensock[listensock_index];
}
listensock_index++;
}
}
signal(SIGINT, handle_sigint);
signal(SIGTERM, handle_sigint);
#ifdef SIGHUP
signal(SIGHUP, handle_sighup);
#endif
#ifndef WIN32
signal(SIGUSR1, handle_sigusr1);
signal(SIGUSR2, handle_sigusr2);
signal(SIGPIPE, SIG_IGN);
#endif
#ifdef WITH_BRIDGE
for(i=0; i<config.bridge_count; i++){
if(mqtt3_bridge_new(&int_db, &(config.bridges[i]))){
_mosquitto_log_printf(NULL, MOSQ_LOG_WARNING, "Warning: Unable to connect to bridge %s.",
config.bridges[i].name);
}
}
#endif
run = 1;
rc = mosquitto_main_loop(&int_db, listensock, listensock_count, listener_max);
_mosquitto_log_printf(NULL, MOSQ_LOG_INFO, "mosquitto version %s terminating", VERSION);
mqtt3_log_close();
#ifdef WITH_PERSISTENCE
if(config.persistence){
mqtt3_db_backup(&int_db, true, true);
}
#endif
for(i=0; i<int_db.context_count; i++){
if(int_db.contexts[i]){
mqtt3_context_cleanup(&int_db, int_db.contexts[i], true);
}
}
_mosquitto_free(int_db.contexts);
int_db.contexts = NULL;
mqtt3_db_close(&int_db);
if(listensock){
for(i=0; i<listensock_count; i++){
if(listensock[i] != INVALID_SOCKET){
#ifndef WIN32
close(listensock[i]);
#else
closesocket(listensock[i]);
#endif
}
}
_mosquitto_free(listensock);
}
mosquitto_security_module_cleanup(&int_db);
if(config.pid_file){
remove(config.pid_file);
}
_mosquitto_net_cleanup();
mqtt3_config_cleanup(int_db.config);
return rc;
}
int _mosquitto_log_vprintf(struct mosquitto *mosq, int priority, const char *fmt, va_list va)
{
char *s;
char *st;
int len;
#ifdef WIN32
char *sp;
#endif
const char *topic;
int syslog_priority;
time_t now = time(NULL);
static time_t last_flush = 0;
if((log_priorities & priority) && log_destinations != MQTT3_LOG_NONE){
switch(priority){
case MOSQ_LOG_SUBSCRIBE:
topic = "$SYS/broker/log/M/subscribe";
#ifndef WIN32
syslog_priority = LOG_NOTICE;
#else
syslog_priority = EVENTLOG_INFORMATION_TYPE;
#endif
break;
case MOSQ_LOG_UNSUBSCRIBE:
topic = "$SYS/broker/log/M/unsubscribe";
#ifndef WIN32
syslog_priority = LOG_NOTICE;
#else
syslog_priority = EVENTLOG_INFORMATION_TYPE;
#endif
break;
case MOSQ_LOG_DEBUG:
topic = "$SYS/broker/log/D";
#ifndef WIN32
syslog_priority = LOG_DEBUG;
#else
syslog_priority = EVENTLOG_INFORMATION_TYPE;
#endif
break;
case MOSQ_LOG_ERR:
topic = "$SYS/broker/log/E";
#ifndef WIN32
syslog_priority = LOG_ERR;
#else
syslog_priority = EVENTLOG_ERROR_TYPE;
#endif
break;
case MOSQ_LOG_WARNING:
topic = "$SYS/broker/log/W";
#ifndef WIN32
syslog_priority = LOG_WARNING;
#else
syslog_priority = EVENTLOG_WARNING_TYPE;
#endif
break;
case MOSQ_LOG_NOTICE:
topic = "$SYS/broker/log/N";
#ifndef WIN32
syslog_priority = LOG_NOTICE;
#else
syslog_priority = EVENTLOG_INFORMATION_TYPE;
#endif
break;
case MOSQ_LOG_INFO:
topic = "$SYS/broker/log/I";
#ifndef WIN32
syslog_priority = LOG_INFO;
#else
syslog_priority = EVENTLOG_INFORMATION_TYPE;
#endif
break;
#ifdef WITH_WEBSOCKETS
case MOSQ_LOG_WEBSOCKETS:
topic = "$SYS/broker/log/WS";
#ifndef WIN32
syslog_priority = LOG_DEBUG;
#else
syslog_priority = EVENTLOG_INFORMATION_TYPE;
#endif
break;
#endif
default:
topic = "$SYS/broker/log/E";
#ifndef WIN32
syslog_priority = LOG_ERR;
#else
syslog_priority = EVENTLOG_ERROR_TYPE;
#endif
}
len = strlen(fmt) + 500;
s = _mosquitto_malloc(len*sizeof(char));
if(!s) return MOSQ_ERR_NOMEM;
vsnprintf(s, len, fmt, va);
s[len-1] = '\0'; /* Ensure string is null terminated. */
if(log_destinations & MQTT3_LOG_STDOUT){
if(int_db.config && int_db.config->log_timestamp){
fprintf(stdout, "%d: %s\n", (int)now, s);
}else{
fprintf(stdout, "%s\n", s);
}
fflush(stdout);
}
if(log_destinations & MQTT3_LOG_STDERR){
if(int_db.config && int_db.config->log_timestamp){
fprintf(stderr, "%d: %s\n", (int)now, s);
}else{
fprintf(stderr, "%s\n", s);
}
fflush(stderr);
}
if(log_destinations & MQTT3_LOG_FILE && int_db.config->log_fptr){
if(int_db.config && int_db.config->log_timestamp){
fprintf(int_db.config->log_fptr, "%d: %s\n", (int)now, s);
}else{
fprintf(int_db.config->log_fptr, "%s\n", s);
}
if(now - last_flush > 1){
fflush(int_db.config->log_fptr);
last_flush = now;
}
}
if(log_destinations & MQTT3_LOG_SYSLOG){
#ifndef WIN32
syslog(syslog_priority, "%s", s);
#else
sp = (char *)s;
ReportEvent(syslog_h, syslog_priority, 0, 0, NULL, 1, 0, &sp, NULL);
#endif
}
if(log_destinations & MQTT3_LOG_TOPIC && priority != MOSQ_LOG_DEBUG){
if(int_db.config && int_db.config->log_timestamp){
len += 30;
st = _mosquitto_malloc(len*sizeof(char));
if(!st){
_mosquitto_free(s);
return MOSQ_ERR_NOMEM;
}
snprintf(st, len, "%d: %s", (int)now, s);
mqtt3_db_messages_easy_queue(&int_db, NULL, topic, 2, strlen(st), st, 0);
_mosquitto_free(st);
}else{
mqtt3_db_messages_easy_queue(&int_db, NULL, topic, 2, strlen(s), s, 0);
}
}
_mosquitto_free(s);
}
return MOSQ_ERR_SUCCESS;
}