int _mosquitto_handle_publish(struct mosquitto *mosq)
{
uint8_t header;
struct mosquitto_message_all *message;
int rc = 0;
uint16_t mid;
assert(mosq);
message = _mosquitto_calloc(1, sizeof(struct mosquitto_message_all));
if(!message) return MOSQ_ERR_NOMEM;
header = mosq->in_packet.command;
message->direction = mosq_md_in;
message->dup = (header & 0x08)>>3;
message->msg.qos = (header & 0x06)>>1;
message->msg.retain = (header & 0x01);
rc = _mosquitto_read_string(&mosq->in_packet, &message->msg.topic);
if(rc){
_mosquitto_message_cleanup(&message);
return rc;
}
rc = _mosquitto_fix_sub_topic(&message->msg.topic);
if(rc){
_mosquitto_message_cleanup(&message);
return rc;
}
if(!strlen(message->msg.topic)){
_mosquitto_message_cleanup(&message);
return MOSQ_ERR_PROTOCOL;
}
if(message->msg.qos > 0){
rc = _mosquitto_read_uint16(&mosq->in_packet, &mid);
if(rc){
_mosquitto_message_cleanup(&message);
return rc;
}
message->msg.mid = (int)mid;
}
message->msg.payloadlen = mosq->in_packet.remaining_length - mosq->in_packet.pos;
if(message->msg.payloadlen){
message->msg.payload = _mosquitto_calloc(message->msg.payloadlen+1, sizeof(uint8_t));
rc = _mosquitto_read_bytes(&mosq->in_packet, message->msg.payload, message->msg.payloadlen);
if(rc){
_mosquitto_message_cleanup(&message);
return rc;
}
}
_mosquitto_log_printf(mosq, MOSQ_LOG_DEBUG,
"Client %s received PUBLISH (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))",
mosq->id, message->dup, message->msg.qos, message->msg.retain,
message->msg.mid, message->msg.topic,
(long)message->msg.payloadlen);
message->timestamp = mosquitto_time();
switch(message->msg.qos){
case 0:
pthread_mutex_lock(&mosq->callback_mutex);
if(mosq->on_message){
mosq->in_callback = true;
mosq->on_message(mosq, mosq->userdata, &message->msg);
mosq->in_callback = false;
}
pthread_mutex_unlock(&mosq->callback_mutex);
_mosquitto_message_cleanup(&message);
return MOSQ_ERR_SUCCESS;
case 1:
rc = _mosquitto_send_puback(mosq, message->msg.mid);
pthread_mutex_lock(&mosq->callback_mutex);
if(mosq->on_message){
mosq->in_callback = true;
mosq->on_message(mosq, mosq->userdata, &message->msg);
mosq->in_callback = false;
}
pthread_mutex_unlock(&mosq->callback_mutex);
_mosquitto_message_cleanup(&message);
return rc;
case 2:
rc = _mosquitto_send_pubrec(mosq, message->msg.mid);
message->state = mosq_ms_wait_for_pubrel;
pthread_mutex_lock(&mosq->message_mutex);
_mosquitto_message_queue(mosq, message, true);
pthread_mutex_unlock(&mosq->message_mutex);
return rc;
default:
return MOSQ_ERR_PROTOCOL;
}
}
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_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;
}
