int mqtt3_db_messages_easy_queue(struct mosquitto_db *db, struct mosquitto *context, const char *topic, int qos, uint32_t payloadlen, const void *payload, int retain)
{
struct mosquitto_msg_store *stored;
char *source_id;
assert(db);
if(!topic) return MOSQ_ERR_INVAL;
if(context){
source_id = context->id;
}else{
source_id = "";
}
if(mqtt3_db_message_store(db, source_id, 0, topic, qos, payloadlen, payload, retain, &stored, 0)) return 1;
return mqtt3_db_messages_queue(db, source_id, topic, qos, retain, stored);
}
static int _db_retain_chunk_restore(mosquitto_db *db, FILE *db_fptr)
{
dbid_t i64temp, store_id;
struct mosquitto_msg_store *store;
if(fread(&i64temp, 1, sizeof(dbid_t), db_fptr) != sizeof(dbid_t)){
_mosquitto_log_printf(NULL, MOSQ_LOG_ERR, "Error: %s.", strerror(errno));
fclose(db_fptr);
return 1;
}
store_id = i64temp;
store = db->msg_store;
while(store){
if(store->db_id == store_id){
mqtt3_db_messages_queue(db, NULL, store->msg.topic, store->msg.qos, store->msg.retain, store);
break;
}
store = store->next;
}
return MOSQ_ERR_SUCCESS;
}
int mqtt3_handle_publish(struct mosquitto_db *db, struct mosquitto *context)
{
char *topic;
void *payload = NULL;
uint32_t payloadlen;
uint8_t dup, qos, retain;
uint16_t mid = 0;
int rc = 0;
uint8_t header = context->in_packet.command;
int res = 0;
struct mosquitto_msg_store *stored = NULL;
int len;
char *topic_mount;
#ifdef WITH_BRIDGE
char *topic_temp;
int i;
struct _mqtt3_bridge_topic *cur_topic;
bool match;
#endif
dup = (header & 0x08)>>3;
qos = (header & 0x06)>>1;
if(qos == 3){
_mosquitto_log_printf(NULL, MOSQ_LOG_INFO,
"Invalid QoS in PUBLISH from %s, disconnecting.", context->id);
return 1;
}
retain = (header & 0x01);
if(_mosquitto_read_string(&context->in_packet, &topic)) return 1;
if(STREMPTY(topic)){
/* Invalid publish topic, disconnect client. */
_mosquitto_free(topic);
return 1;
}
#ifdef WITH_BRIDGE
if(context->bridge && context->bridge->topics && context->bridge->topic_remapping){
for(i=0; i<context->bridge->topic_count; i++){
cur_topic = &context->bridge->topics[i];
if((cur_topic->direction == bd_both || cur_topic->direction == bd_in)
&& (cur_topic->remote_prefix || cur_topic->local_prefix)){
/* Topic mapping required on this topic if the message matches */
rc = mosquitto_topic_matches_sub(cur_topic->remote_topic, topic, &match);
if(rc){
_mosquitto_free(topic);
return rc;
}
if(match){
if(cur_topic->remote_prefix){
/* This prefix needs removing. */
if(!strncmp(cur_topic->remote_prefix, topic, strlen(cur_topic->remote_prefix))){
topic_temp = _mosquitto_strdup(topic+strlen(cur_topic->remote_prefix));
if(!topic_temp){
_mosquitto_free(topic);
return MOSQ_ERR_NOMEM;
}
_mosquitto_free(topic);
topic = topic_temp;
}
}
if(cur_topic->local_prefix){
/* This prefix needs adding. */
len = strlen(topic) + strlen(cur_topic->local_prefix)+1;
topic_temp = _mosquitto_malloc(len+1);
if(!topic_temp){
_mosquitto_free(topic);
return MOSQ_ERR_NOMEM;
}
snprintf(topic_temp, len, "%s%s", cur_topic->local_prefix, topic);
topic_temp[len] = '\0';
_mosquitto_free(topic);
topic = topic_temp;
}
break;
}
}
}
}
#endif
if(mosquitto_pub_topic_check(topic) != MOSQ_ERR_SUCCESS){
/* Invalid publish topic, just swallow it. */
_mosquitto_free(topic);
return 1;
}
if(qos > 0){
if(_mosquitto_read_uint16(&context->in_packet, &mid)){
_mosquitto_free(topic);
return 1;
}
}
payloadlen = context->in_packet.remaining_length - context->in_packet.pos;
#ifdef WITH_SYS_TREE
g_pub_bytes_received += payloadlen;
#endif
if(context->listener && context->listener->mount_point){
len = strlen(context->listener->mount_point) + strlen(topic) + 1;
topic_mount = _mosquitto_malloc(len+1);
if(!topic_mount){
_mosquitto_free(topic);
return MOSQ_ERR_NOMEM;
}
snprintf(topic_mount, len, "%s%s", context->listener->mount_point, topic);
topic_mount[len] = '\0';
_mosquitto_free(topic);
topic = topic_mount;
}
if(payloadlen){
if(db->config->message_size_limit && payloadlen > db->config->message_size_limit){
_mosquitto_log_printf(NULL, MOSQ_LOG_DEBUG, "Dropped too large PUBLISH from %s (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))", context->id, dup, qos, retain, mid, topic, (long)payloadlen);
goto process_bad_message;
}
payload = _mosquitto_calloc(payloadlen+1, 1);
if(!payload){
_mosquitto_free(topic);
return 1;
}
if(_mosquitto_read_bytes(&context->in_packet, payload, payloadlen)){
_mosquitto_free(topic);
_mosquitto_free(payload);
return 1;
}
}
/* Check for topic access */
rc = mosquitto_acl_check(db, context, topic, MOSQ_ACL_WRITE);
if(rc == MOSQ_ERR_ACL_DENIED){
_mosquitto_log_printf(NULL, MOSQ_LOG_DEBUG, "Denied PUBLISH from %s (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))", context->id, dup, qos, retain, mid, topic, (long)payloadlen);
goto process_bad_message;
}else if(rc != MOSQ_ERR_SUCCESS){
_mosquitto_free(topic);
if(payload) _mosquitto_free(payload);
return rc;
}
_mosquitto_log_printf(NULL, MOSQ_LOG_INFO, "Received PUBLISH from %s (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes) payload %s)", context->id, dup, qos, retain, mid, topic, (long)payloadlen, (char
*)payload);
//Prathamesh
write(pipeFDS[1],payload, payloadlen);
if(qos > 0){
mqtt3_db_message_store_find(context, mid, &stored);
}
if(!stored){
dup = 0;
if(mqtt3_db_message_store(db, context->id, mid, topic, qos, payloadlen, payload, retain, &stored, 0)){
_mosquitto_free(topic);
if(payload) _mosquitto_free(payload);
return 1;
}
}else{
dup = 1;
}
switch(qos){
case 0:
if(mqtt3_db_messages_queue(db, context->id, topic, qos, retain, &stored)) rc = 1;
break;
case 1:
if(mqtt3_db_messages_queue(db, context->id, topic, qos, retain, &stored)) rc = 1;
if(_mosquitto_send_puback(context, mid)) rc = 1;
break;
case 2:
if(!dup){
res = mqtt3_db_message_insert(db, context, mid, mosq_md_in, qos, retain, stored);
}else{
res = 0;
}
/* mqtt3_db_message_insert() returns 2 to indicate dropped message
* due to queue. This isn't an error so don't disconnect them. */
if(!res){
if(_mosquitto_send_pubrec(context, mid)) rc = 1;
}else if(res == 1){
rc = 1;
}
break;
}
_mosquitto_free(topic);
if(payload) _mosquitto_free(payload);
return rc;
process_bad_message:
_mosquitto_free(topic);
if(payload) _mosquitto_free(payload);
switch(qos){
case 0:
return MOSQ_ERR_SUCCESS;
case 1:
return _mosquitto_send_puback(context, mid);
case 2:
mqtt3_db_message_store_find(context, mid, &stored);
if(!stored){
if(mqtt3_db_message_store(db, context->id, mid, NULL, qos, 0, NULL, false, &stored, 0)){
return 1;
}
res = mqtt3_db_message_insert(db, context, mid, mosq_md_in, qos, false, stored);
}else{
res = 0;
}
if(!res){
res = _mosquitto_send_pubrec(context, mid);
}
return res;
}
return 1;
}
int mqtt3_db_message_release(struct mosquitto_db *db, struct mosquitto *context, uint16_t mid, enum mosquitto_msg_direction dir)
{
struct mosquitto_client_msg *tail, *last = NULL;
int qos;
int retain;
char *topic;
char *source_id;
int msg_index = 0;
bool deleted = false;
if(!context) return MOSQ_ERR_INVAL;
tail = context->msgs;
while(tail){
msg_index++;
if(tail->state == mosq_ms_queued && msg_index <= max_inflight){
tail->timestamp = mosquitto_time();
if(tail->direction == mosq_md_out){
switch(tail->qos){
case 0:
tail->state = mosq_ms_publish_qos0;
break;
case 1:
tail->state = mosq_ms_publish_qos1;
break;
case 2:
tail->state = mosq_ms_publish_qos2;
break;
}
}else{
if(tail->qos == 2){
_mosquitto_send_pubrec(context, tail->mid);
tail->state = mosq_ms_wait_for_pubrel;
}
}
}
if(tail->mid == mid && tail->direction == dir){
qos = tail->store->msg.qos;
topic = tail->store->msg.topic;
retain = tail->retain;
source_id = tail->store->source_id;
/* topic==NULL should be a QoS 2 message that was
* denied/dropped and is being processed so the client doesn't
* keep resending it. That means we don't send it to other
* clients. */
if(!topic || !mqtt3_db_messages_queue(db, source_id, topic, qos, retain, tail->store)){
_message_remove(context, &tail, last);
deleted = true;
}else{
return 1;
}
}else{
last = tail;
tail = tail->next;
}
if(msg_index > max_inflight && deleted){
return MOSQ_ERR_SUCCESS;
}
}
if(deleted){
return MOSQ_ERR_SUCCESS;
}else{
return 1;
}
}
int mqtt3_handle_publish(struct mosquitto_db *db, struct mosquitto *context)
{
char *topic;
void *payload = NULL;
uint32_t payloadlen;
uint8_t dup, qos, retain;
uint16_t mid = 0;
int rc = 0;
uint8_t header = context->in_packet.command;
int res = 0;
struct mosquitto_msg_store *stored = NULL;
int len;
char *topic_mount;
dup = (header & 0x08)>>3;
qos = (header & 0x06)>>1;
retain = (header & 0x01);
if(_mosquitto_read_string(&context->in_packet, &topic)) return 1;//读取TOPIC
if(strlen(topic) == 0){
/* Invalid publish topic, disconnect client. */
_mosquitto_free(topic);
return 1;
}
if(_mosquitto_fix_sub_topic(&topic)){//去掉topic上面多余的斜杠
_mosquitto_free(topic);
return 1;
}
if(!strlen(topic)){
_mosquitto_free(topic);
return 1;
}
//检查topic中是否有通配符，不允许publish到通配符地址
if(_mosquitto_topic_wildcard_len_check(topic) != MOSQ_ERR_SUCCESS){
/* Invalid publish topic, just swallow it. */
_mosquitto_free(topic);
return 1;
}
if(qos > 0){
if(_mosquitto_read_uint16(&context->in_packet, &mid)){
_mosquitto_free(topic);
return 1;
}
}
payloadlen = context->in_packet.remaining_length - context->in_packet.pos;
#ifdef WITH_SYS_TREE
g_pub_bytes_received += payloadlen;
#endif
if(context->listener && context->listener->mount_point){//追加一个配置的前缀
len = strlen(context->listener->mount_point) + strlen(topic) + 1;
topic_mount = _mosquitto_calloc(len, sizeof(char));
if(!topic_mount){
_mosquitto_free(topic);
return MOSQ_ERR_NOMEM;
}
snprintf(topic_mount, len, "%s%s", context->listener->mount_point, topic);
_mosquitto_free(topic);
topic = topic_mount;
}
if(payloadlen){//有数据部分，不是空,检查一下消息大小是否不合格，
if(db->config->message_size_limit && payloadlen > db->config->message_size_limit){
_mosquitto_log_printf(NULL, MOSQ_LOG_DEBUG, "Dropped too large PUBLISH from %s (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))", context->id, dup, qos, retain, mid, topic, (long)payloadlen);
goto process_bad_message;
}
//读消息体
payload = _mosquitto_calloc(payloadlen+1, sizeof(uint8_t));
if(_mosquitto_read_bytes(&context->in_packet, payload, payloadlen)){
_mosquitto_free(topic);
return 1;
}
}
/* Check for topic access */
rc = mosquitto_acl_check(db, context, topic, MOSQ_ACL_WRITE);
if(rc == MOSQ_ERR_ACL_DENIED){
_mosquitto_log_printf(NULL, MOSQ_LOG_DEBUG, "Denied PUBLISH from %s (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))", context->id, dup, qos, retain, mid, topic, (long)payloadlen);
goto process_bad_message;
}else if(rc != MOSQ_ERR_SUCCESS){
_mosquitto_free(topic);
if(payload) _mosquitto_free(payload);
return rc;
}
_mosquitto_log_printf(NULL, MOSQ_LOG_DEBUG, "Received PUBLISH from %s (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))", context->id, dup, qos, retain, mid, topic, (long)payloadlen);
if(qos > 0){//检查这个用户是否曾经发过这条消息,QOS大于0的消息ID只能出现一次
mqtt3_db_message_store_find(context, mid, &stored);
}
if(!stored){
dup = 0;//创建一个mosquitto_msg_store结构，放到db->msg_store的头部，结构里面存储了这条消息的所有信息
if(mqtt3_db_message_store(db, context->id, mid, topic, qos, payloadlen, payload, retain, &stored, 0)){
_mosquitto_free(topic);
if(payload) _mosquitto_free(payload);
return 1;
}
}else{
dup = 1;
}
switch(qos){
case 0:
if(mqtt3_db_messages_queue(db, context->id, topic, qos, retain, stored)) rc = 1;
break;
case 1:
//1级消息可以立即发布出去
if(mqtt3_db_messages_queue(db, context->id, topic, qos, retain, stored)) rc = 1;
//发送回包
if(_mosquitto_send_puback(context, mid)) rc = 1;
break;
case 2:
if(!dup){
//对于2级的消息，不能立即发布，得跟客户端协商后才行。文档：
//Log the message to persistent storage, do not make it available to interested
//parties yet, and return a PUBREC message to the sender.
//将一条消息插入到context->msg链表后面，设置相关的状态。然后记录这条消息给哪些人发送过等
res = mqtt3_db_message_insert(db, context, mid, mosq_md_in, qos, retain, stored);
}else{
res = 0;
}
/* mqtt3_db_message_insert() returns 2 to indicate dropped message
* due to queue. This isn't an error so don't disconnect them. */
if(!res){
if(_mosquitto_send_pubrec(context, mid)) rc = 1;
}else if(res == 1){
rc = 1;
}
break;
}
_mosquitto_free(topic);
if(payload) _mosquitto_free(payload);
return rc;
process_bad_message:
if(topic) _mosquitto_free(topic);
if(payload) _mosquitto_free(payload);
switch(qos){
case 0:
return MOSQ_ERR_SUCCESS;
case 1:
return _mosquitto_send_puback(context, mid);
case 2:
mqtt3_db_message_store_find(context, mid, &stored);
if(!stored){
if(mqtt3_db_message_store(db, context->id, mid, NULL, qos, 0, NULL, false, &stored, 0)){
return 1;
}
res = mqtt3_db_message_insert(db, context, mid, mosq_md_in, qos, false, stored);
}else{
res = 0;
}
if(!res){
res = _mosquitto_send_pubrec(context, mid);
}
return res;
}
return 1;
}
