int send__connack(struct mosquitto_db *db, struct mosquitto *context, int ack, int reason_code, const mosquitto_property *properties)
{
struct mosquitto__packet *packet = NULL;
int rc;
mosquitto_property *connack_props = NULL;
int proplen, varbytes;
uint32_t remaining_length;
rc = mosquitto_property_copy_all(&connack_props, properties);
if(rc){
return rc;
}
if(context->id){
log__printf(NULL, MOSQ_LOG_DEBUG, "Sending CONNACK to %s (%d, %d)", context->id, ack, reason_code);
}else{
log__printf(NULL, MOSQ_LOG_DEBUG, "Sending CONNACK to %s (%d, %d)", context->address, ack, reason_code);
}
remaining_length = 2;
if(context->protocol == mosq_p_mqtt5){
if(reason_code < 128 && db->config->retain_available == false){
rc = mosquitto_property_add_byte(&connack_props, MQTT_PROP_RETAIN_AVAILABLE, 0);
if(rc){
mosquitto_property_free_all(&connack_props);
return rc;
}
}
if(db->config->max_packet_size > 0){
rc = mosquitto_property_add_int32(&connack_props, MQTT_PROP_MAXIMUM_PACKET_SIZE, db->config->max_packet_size);
if(rc){
mosquitto_property_free_all(&connack_props);
return rc;
}
}
proplen = property__get_length_all(connack_props);
varbytes = packet__varint_bytes(proplen);
remaining_length += proplen + varbytes;
}
if(packet__check_oversize(context, remaining_length)){
mosquitto_property_free_all(&connack_props);
mosquitto__free(packet);
return MOSQ_ERR_OVERSIZE_PACKET;
}
packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
if(!packet) return MOSQ_ERR_NOMEM;
packet->command = CMD_CONNACK;
packet->remaining_length = remaining_length;
rc = packet__alloc(packet);
if(rc){
mosquitto_property_free_all(&connack_props);
mosquitto__free(packet);
return rc;
}
packet__write_byte(packet, ack);
packet__write_byte(packet, reason_code);
if(context->protocol == mosq_p_mqtt5){
property__write_all(packet, connack_props, true);
}
mosquitto_property_free_all(&connack_props);
return packet__queue(context, packet);
}
int send__unsubscribe(struct mosquitto *mosq, int *mid, int topic_count, char *const *const topic, const mosquitto_property *properties)
{
/* FIXME - only deals with a single topic */
struct mosquitto__packet *packet = NULL;
uint32_t packetlen;
uint16_t local_mid;
int rc;
int proplen, varbytes;
int i;
assert(mosq);
assert(topic);
packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
if(!packet) return MOSQ_ERR_NOMEM;
packetlen = 2;
for(i=0; i<topic_count; i++){
packetlen += 2+strlen(topic[i]);
}
if(mosq->protocol == mosq_p_mqtt5){
proplen = property__get_length_all(properties);
varbytes = packet__varint_bytes(proplen);
packetlen += proplen + varbytes;
}
packet->command = CMD_UNSUBSCRIBE | (1<<1);
packet->remaining_length = packetlen;
rc = packet__alloc(packet);
if(rc){
mosquitto__free(packet);
return rc;
}
/* Variable header */
local_mid = mosquitto__mid_generate(mosq);
if(mid) *mid = (int)local_mid;
packet__write_uint16(packet, local_mid);
if(mosq->protocol == mosq_p_mqtt5){
/* We don't use User Property yet. */
property__write_all(packet, properties, true);
}
/* Payload */
for(i=0; i<topic_count; i++){
packet__write_string(packet, topic[i], strlen(topic[i]));
}
#ifdef WITH_BROKER
# ifdef WITH_BRIDGE
for(i=0; i<topic_count; i++){
log__printf(mosq, MOSQ_LOG_DEBUG, "Bridge %s sending UNSUBSCRIBE (Mid: %d, Topic: %s)", mosq->id, local_mid, topic[i]);
}
# endif
#else
for(i=0; i<topic_count; i++){
log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending UNSUBSCRIBE (Mid: %d, Topic: %s)", mosq->id, local_mid, topic[i]);
}
#endif
return packet__queue(mosq, packet);
}
int bridge__connect(struct mosquitto_db *db, struct mosquitto *context)
{
int rc, rc2;
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;
bridge__packet_cleanup(context);
db__message_reconnect_reset(db, context);
if(context->clean_session){
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.
*/
sub__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){
log__printf(NULL, MOSQ_LOG_DEBUG, "Bridge %s doing local SUBSCRIBE on topic %s", context->id, context->bridge->topics[i].local_topic);
if(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';
db__messages_easy_queue(db, context, context->bridge->notification_topic, 1, 1, ¬ification_payload, 1);
context->bridge->initial_notification_done = true;
}
if (!context->bridge->notifications_local_only) {
notification_payload = '0';
rc = 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';
db__messages_easy_queue(db, context, notification_topic, 1, 1, ¬ification_payload, 1);
context->bridge->initial_notification_done = true;
}
if (!context->bridge->notifications_local_only) {
notification_payload = '0';
rc = will__set(context, notification_topic, 1, ¬ification_payload, 1, true);
mosquitto__free(notification_topic);
if(rc != MOSQ_ERR_SUCCESS){
return rc;
}
}
}
}
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 = net__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){
net__socket_close(db, context);
return rc; /* Error already printed */
}else if(rc == MOSQ_ERR_ERRNO){
log__printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", strerror(errno));
}else if(rc == MOSQ_ERR_EAI){
log__printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", gai_strerror(errno));
}
return rc;
}else if(rc == MOSQ_ERR_CONN_PENDING){
context->state = mosq_cs_connect_pending;
}
HASH_ADD(hh_sock, db->contexts_by_sock, sock, sizeof(context->sock), context);
rc2 = send__connect(context, context->keepalive, context->clean_session);
if(rc2 == MOSQ_ERR_SUCCESS){
return rc;
}else if(rc2 == MOSQ_ERR_ERRNO && errno == ENOTCONN){
return MOSQ_ERR_SUCCESS;
}else{
if(rc2 == MOSQ_ERR_TLS){
return rc2; /* Error already printed */
}else if(rc2 == MOSQ_ERR_ERRNO){
log__printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", strerror(errno));
}else if(rc2 == MOSQ_ERR_EAI){
log__printf(NULL, MOSQ_LOG_ERR, "Error creating bridge: %s.", gai_strerror(errno));
}
net__socket_close(db, context);
return rc2;
}
}
int handle__unsubscribe(struct mosquitto_db *db, struct mosquitto *context)
{
uint16_t mid;
char *sub;
int slen;
int rc;
uint8_t reason;
int reason_code_count = 0;
int reason_code_max;
uint8_t *reason_codes = NULL, *reason_tmp;
mosquitto_property *properties = NULL;
if(!context) return MOSQ_ERR_INVAL;
if(context->state != mosq_cs_connected){
return MOSQ_ERR_PROTOCOL;
}
log__printf(NULL, MOSQ_LOG_DEBUG, "Received UNSUBSCRIBE from %s", context->id);
if(context->protocol != mosq_p_mqtt31){
if((context->in_packet.command&0x0F) != 0x02){
return MOSQ_ERR_PROTOCOL;
}
}
if(packet__read_uint16(&context->in_packet, &mid)) return 1;
if(mid == 0) return MOSQ_ERR_PROTOCOL;
if(context->protocol == mosq_p_mqtt5){
rc = property__read_all(CMD_UNSUBSCRIBE, &context->in_packet, &properties);
if(rc) return rc;
/* Immediately free, we don't do anything with User Property at the moment */
mosquitto_property_free_all(&properties);
}
if(context->protocol == mosq_p_mqtt311 || context->protocol == mosq_p_mqtt5){
if(context->in_packet.pos == context->in_packet.remaining_length){
/* No topic specified, protocol error. */
return MOSQ_ERR_PROTOCOL;
}
}
reason_code_max = 10;
reason_codes = mosquitto__malloc(reason_code_max);
if(!reason_codes){
return MOSQ_ERR_NOMEM;
}
while(context->in_packet.pos < context->in_packet.remaining_length){
sub = NULL;
if(packet__read_string(&context->in_packet, &sub, &slen)){
return 1;
}
if(!slen){
log__printf(NULL, MOSQ_LOG_INFO,
"Empty unsubscription string from %s, disconnecting.",
context->id);
mosquitto__free(sub);
return 1;
}
if(mosquitto_sub_topic_check(sub)){
log__printf(NULL, MOSQ_LOG_INFO,
"Invalid unsubscription string from %s, disconnecting.",
context->id);
mosquitto__free(sub);
return 1;
}
log__printf(NULL, MOSQ_LOG_DEBUG, "\t%s", sub);
rc = sub__remove(db, context, sub, db->subs, &reason);
log__printf(NULL, MOSQ_LOG_UNSUBSCRIBE, "%s %s", context->id, sub);
mosquitto__free(sub);
if(rc) return rc;
reason_codes[reason_code_count] = reason;
reason_code_count++;
if(reason_code_count == reason_code_max){
reason_tmp = mosquitto__realloc(reason_codes, reason_code_max*2);
if(!reason_tmp){
mosquitto__free(reason_codes);
return MOSQ_ERR_NOMEM;
}
reason_codes = reason_tmp;
reason_code_max *= 2;
}
}
#ifdef WITH_PERSISTENCE
db->persistence_changes++;
#endif
log__printf(NULL, MOSQ_LOG_DEBUG, "Sending UNSUBACK to %s", context->id);
/* We don't use Reason String or User Property yet. */
rc = send__unsuback(context, mid, reason_code_count, reason_codes, NULL);
mosquitto__free(reason_codes);
return rc;
}
int persist__chunk_message_store_write_v5(FILE *db_fptr, struct P_msg_store *chunk)
{
struct PF_header header;
uint32_t payloadlen = chunk->F.payloadlen;
uint16_t source_id_len = chunk->F.source_id_len;
uint16_t source_username_len = chunk->F.source_username_len;
uint16_t topic_len = chunk->F.topic_len;
uint32_t proplen = 0;
struct mosquitto__packet prop_packet;
int rc;
memset(&prop_packet, 0, sizeof(struct mosquitto__packet));
if(chunk->properties){
proplen = property__get_length_all(chunk->properties);
proplen += packet__varint_bytes(proplen);
}
chunk->F.payloadlen = htonl(chunk->F.payloadlen);
chunk->F.source_mid = htons(chunk->F.source_mid);
chunk->F.source_id_len = htons(chunk->F.source_id_len);
chunk->F.source_username_len = htons(chunk->F.source_username_len);
chunk->F.topic_len = htons(chunk->F.topic_len);
chunk->F.source_port = htons(chunk->F.source_port);
header.chunk = htonl(DB_CHUNK_MSG_STORE);
header.length = htonl(sizeof(struct PF_msg_store) +
topic_len + payloadlen +
source_id_len + source_username_len + proplen);
write_e(db_fptr, &header, sizeof(struct PF_header));
write_e(db_fptr, &chunk->F, sizeof(struct PF_msg_store));
if(source_id_len){
write_e(db_fptr, chunk->source.id, source_id_len);
}
if(source_username_len){
write_e(db_fptr, chunk->source.username, source_username_len);
}
write_e(db_fptr, chunk->topic, topic_len);
if(payloadlen){
write_e(db_fptr, UHPA_ACCESS(chunk->payload, payloadlen), (unsigned int)payloadlen);
}
if(chunk->properties){
if(proplen > 0){
prop_packet.remaining_length = proplen;
prop_packet.packet_length = proplen;
prop_packet.payload = mosquitto__malloc(proplen);
if(!prop_packet.payload){
return MOSQ_ERR_NOMEM;
}
rc = property__write_all(&prop_packet, chunk->properties, true);
if(rc) return rc;
write_e(db_fptr, prop_packet.payload, proplen);
mosquitto__free(prop_packet.payload);
}
}
return MOSQ_ERR_SUCCESS;
error:
log__printf(NULL, MOSQ_LOG_ERR, "Error: %s.", strerror(errno));
mosquitto__free(prop_packet.payload);
return 1;
}