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context.c
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context.c
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/*
Copyright (c) 2009-2020 Roger Light <[email protected]>
All rights reserved. This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
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:https://www.eclipse.org/org/documents/edl-v10.php.
SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
Contributors:
Roger Light - initial implementation and documentation.
*/
#include "config.h"
#include <assert.h>
#include <time.h>
#include "mosquitto_broker_internal.h"
#include "alias_mosq.h"
#include "memory_mosq.h"
#include "packet_mosq.h"
#include "property_mosq.h"
#include "time_mosq.h"
#include "util_mosq.h"
#include "will_mosq.h"
#include "uthash.h"
struct mosquitto *context__init(mosq_sock_t sock)
{
struct mosquitto *context;
char address[1024];
context = mosquitto__calloc(1, sizeof(struct mosquitto));
if(!context) return NULL;
#ifdef WITH_EPOLL
context->ident = id_client;
#else
context->pollfd_index = -1;
#endif
mosquitto__set_state(context, mosq_cs_new);
context->sock = sock;
context->last_msg_in = db.now_s;
context->next_msg_out = db.now_s + 60;
context->keepalive = 60; /* Default to 60s */
context->clean_start = true;
context->id = NULL;
context->last_mid = 0;
context->will = NULL;
context->username = NULL;
context->password = NULL;
context->listener = NULL;
context->acl_list = NULL;
context->retain_available = true;
/* is_bridge records whether this client is a bridge or not. This could be
* done by looking at context->bridge for bridges that we create ourself,
* but incoming bridges need some other way of being recorded. */
context->is_bridge = false;
context->in_packet.payload = NULL;
packet__cleanup(&context->in_packet);
context->out_packet = NULL;
context->current_out_packet = NULL;
context->out_packet_count = 0;
context->address = NULL;
if((int)sock >= 0){
if(!net__socket_get_address(sock, address, 1024, &context->remote_port)){
context->address = mosquitto__strdup(address);
}
if(!context->address){
/* getpeername and inet_ntop failed and not a bridge */
mosquitto__free(context);
return NULL;
}
}
context->bridge = NULL;
context->msgs_in.inflight_maximum = db.config->max_inflight_messages;
context->msgs_out.inflight_maximum = db.config->max_inflight_messages;
context->msgs_in.inflight_quota = db.config->max_inflight_messages;
context->msgs_out.inflight_quota = db.config->max_inflight_messages;
context->max_qos = 2;
#ifdef WITH_TLS
context->ssl = NULL;
#endif
if((int)context->sock >= 0){
HASH_ADD(hh_sock, db.contexts_by_sock, sock, sizeof(context->sock), context);
}
return context;
}
/*
* This will result in any outgoing packets going unsent. If we're disconnected
* forcefully then it is usually an error condition and shouldn't be a problem,
* but it will mean that CONNACK messages will never get sent for bad protocol
* versions for example.
*/
void context__cleanup(struct mosquitto *context, bool force_free)
{
struct mosquitto__packet *packet;
if(!context) return;
if(force_free){
context->clean_start = true;
}
#ifdef WITH_BRIDGE
if(context->bridge){
bridge__cleanup(context);
}
#endif
alias__free_all(context);
mosquitto__free(context->auth_method);
context->auth_method = NULL;
mosquitto__free(context->username);
context->username = NULL;
mosquitto__free(context->password);
context->password = NULL;
net__socket_close(context);
if(force_free){
sub__clean_session(context);
}
db__messages_delete(context, force_free);
mosquitto__free(context->address);
context->address = NULL;
context__send_will(context);
if(context->id){
context__remove_from_by_id(context);
mosquitto__free(context->id);
context->id = NULL;
}
packet__cleanup(&(context->in_packet));
if(context->current_out_packet){
packet__cleanup(context->current_out_packet);
mosquitto__free(context->current_out_packet);
context->current_out_packet = NULL;
}
while(context->out_packet){
packet__cleanup(context->out_packet);
packet = context->out_packet;
context->out_packet = context->out_packet->next;
mosquitto__free(packet);
}
context->out_packet_count = 0;
#if defined(WITH_BROKER) && defined(__GLIBC__) && defined(WITH_ADNS)
if(context->adns){
gai_cancel(context->adns);
mosquitto__free((struct addrinfo *)context->adns->ar_request);
mosquitto__free(context->adns);
}
#endif
if(force_free){
mosquitto__free(context);
}
}
void context__send_will(struct mosquitto *ctxt)
{
if(ctxt->state != mosq_cs_disconnecting && ctxt->will){
if(ctxt->will_delay_interval > 0){
will_delay__add(ctxt);
return;
}
if(mosquitto_acl_check(ctxt,
ctxt->will->msg.topic,
(uint32_t)ctxt->will->msg.payloadlen,
ctxt->will->msg.payload,
(uint8_t)ctxt->will->msg.qos,
ctxt->will->msg.retain,
MOSQ_ACL_WRITE) == MOSQ_ERR_SUCCESS){
/* Unexpected disconnect, queue the client will. */
db__messages_easy_queue(ctxt,
ctxt->will->msg.topic,
(uint8_t)ctxt->will->msg.qos,
(uint32_t)ctxt->will->msg.payloadlen,
ctxt->will->msg.payload,
ctxt->will->msg.retain,
ctxt->will->expiry_interval,
&ctxt->will->properties);
}
}
will__clear(ctxt);
}
void context__disconnect(struct mosquitto *context)
{
if(mosquitto__get_state(context) == mosq_cs_disconnected){
return;
}
plugin__handle_disconnect(context, -1);
net__socket_close(context);
context__send_will(context);
if(context->session_expiry_interval == 0){
/* Client session is due to be expired now */
#ifdef WITH_BRIDGE
if(context->bridge == NULL)
#endif
{
if(context->will_delay_interval == 0){
/* This will be done later, after the will is published for delay>0. */
context__add_to_disused(context);
}
}
}else{
session_expiry__add(context);
}
keepalive__remove(context);
mosquitto__set_state(context, mosq_cs_disconnected);
}
void context__add_to_disused(struct mosquitto *context)
{
if(context->state == mosq_cs_disused) return;
mosquitto__set_state(context, mosq_cs_disused);
if(context->id){
context__remove_from_by_id(context);
mosquitto__free(context->id);
context->id = NULL;
}
context->for_free_next = db.ll_for_free;
db.ll_for_free = context;
}
void context__free_disused(void)
{
struct mosquitto *context, *next;
#ifdef WITH_WEBSOCKETS
struct mosquitto *last = NULL;
#endif
context = db.ll_for_free;
db.ll_for_free = NULL;
while(context){
#ifdef WITH_WEBSOCKETS
if(context->wsi){
/* Don't delete yet, lws hasn't finished with it */
if(last){
last->for_free_next = context;
}else{
db.ll_for_free = context;
}
next = context->for_free_next;
context->for_free_next = NULL;
last = context;
context = next;
}else
#endif
{
next = context->for_free_next;
context__cleanup(context, true);
context = next;
}
}
}
void context__remove_from_by_id(struct mosquitto *context)
{
struct mosquitto *context_found;
if(context->removed_from_by_id == false && context->id){
HASH_FIND(hh_id, db.contexts_by_id, context->id, strlen(context->id), context_found);
if(context_found){
HASH_DELETE(hh_id, db.contexts_by_id, context_found);
}
context->removed_from_by_id = true;
}
}