/*
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Copyright (c) 2009-2018 Roger Light <roger@atchoo.org>
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All rights reserved. This program and the accompanying materials
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are made available under the terms of the Eclipse Public License v1.0
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and Eclipse Distribution License v1.0 which accompany this distribution.
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The Eclipse Public License is available at
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http://www.eclipse.org/legal/epl-v10.html
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and the Eclipse Distribution License is available at
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http://www.eclipse.org/org/documents/edl-v10.php.
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Contributors:
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Roger Light - initial implementation and documentation.
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*/
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#include "config.h"
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#include <assert.h>
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#include <string.h>
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#ifdef WIN32
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# include <winsock2.h>
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# include <aclapi.h>
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# include <io.h>
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# include <lmcons.h>
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#else
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# include <sys/stat.h>
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#endif
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#ifdef WITH_BROKER
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#include "mosquitto_broker_internal.h"
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#endif
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#include "mosquitto.h"
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#include "memory_mosq.h"
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#include "net_mosq.h"
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#include "send_mosq.h"
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#include "time_mosq.h"
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#include "tls_mosq.h"
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#include "util_mosq.h"
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/* Check that a topic used for publishing is valid.
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* Search for + or # in a topic. Return MOSQ_ERR_INVAL if found.
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* Also returns MOSQ_ERR_INVAL if the topic string is too long.
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* Returns MOSQ_ERR_SUCCESS if everything is fine.
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*/
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int mosquitto_pub_topic_check(const char *str)
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{
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int len = 0;
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while(str && str[0]){
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if(str[0] == '+' || str[0] == '#'){
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return MOSQ_ERR_INVAL;
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}
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len++;
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str = &str[1];
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}
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if(len > 65535) return MOSQ_ERR_INVAL;
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return MOSQ_ERR_SUCCESS;
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}
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int mosquitto_pub_topic_check2(const char *str, size_t len)
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{
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size_t i;
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if(len > 65535) return MOSQ_ERR_INVAL;
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for(i=0; i<len; i++){
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if(str[i] == '+' || str[i] == '#'){
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return MOSQ_ERR_INVAL;
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}
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}
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return MOSQ_ERR_SUCCESS;
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}
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/* Check that a topic used for subscriptions is valid.
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* Search for + or # in a topic, check they aren't in invalid positions such as
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* foo/#/bar, foo/+bar or foo/bar#.
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* Return MOSQ_ERR_INVAL if invalid position found.
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* Also returns MOSQ_ERR_INVAL if the topic string is too long.
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* Returns MOSQ_ERR_SUCCESS if everything is fine.
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*/
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int mosquitto_sub_topic_check(const char *str)
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{
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char c = '\0';
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int len = 0;
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while(str && str[0]){
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if(str[0] == '+'){
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if((c != '\0' && c != '/') || (str[1] != '\0' && str[1] != '/')){
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return MOSQ_ERR_INVAL;
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}
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}else if(str[0] == '#'){
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if((c != '\0' && c != '/') || str[1] != '\0'){
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return MOSQ_ERR_INVAL;
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}
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}
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len++;
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c = str[0];
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str = &str[1];
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}
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if(len > 65535) return MOSQ_ERR_INVAL;
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return MOSQ_ERR_SUCCESS;
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}
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int mosquitto_sub_topic_check2(const char *str, size_t len)
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{
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char c = '\0';
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size_t i;
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if(len > 65535) return MOSQ_ERR_INVAL;
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for(i=0; i<len; i++){
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if(str[i] == '+'){
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if((c != '\0' && c != '/') || (i<len-1 && str[i+1] != '/')){
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return MOSQ_ERR_INVAL;
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}
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}else if(str[i] == '#'){
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if((c != '\0' && c != '/') || i<len-1){
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return MOSQ_ERR_INVAL;
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}
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}
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c = str[i];
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}
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return MOSQ_ERR_SUCCESS;
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}
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int mosquitto_topic_matches_sub(const char *sub, const char *topic, bool *result)
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{
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return mosquitto_topic_matches_sub2(sub, 0, topic, 0, result);
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}
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/* Does a topic match a subscription? */
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int mosquitto_topic_matches_sub2(const char *sub, size_t sublen, const char *topic, size_t topiclen, bool *result)
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{
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size_t spos;
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UNUSED(sublen);
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UNUSED(topiclen);
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if(!result) return MOSQ_ERR_INVAL;
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*result = false;
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if(!sub || !topic || sub[0] == 0 || topic[0] == 0){
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return MOSQ_ERR_INVAL;
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}
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if((sub[0] == '$' && topic[0] != '$')
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|| (topic[0] == '$' && sub[0] != '$')){
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return MOSQ_ERR_SUCCESS;
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}
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spos = 0;
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while(sub[0] != 0){
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if(topic[0] == '+' || topic[0] == '#'){
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return MOSQ_ERR_INVAL;
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}
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if(sub[0] != topic[0] || topic[0] == 0){ /* Check for wildcard matches */
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if(sub[0] == '+'){
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/* Check for bad "+foo" or "a/+foo" subscription */
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if(spos > 0 && sub[-1] != '/'){
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return MOSQ_ERR_INVAL;
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}
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/* Check for bad "foo+" or "foo+/a" subscription */
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if(sub[1] != 0 && sub[1] != '/'){
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return MOSQ_ERR_INVAL;
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}
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spos++;
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sub++;
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while(topic[0] != 0 && topic[0] != '/'){
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topic++;
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}
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if(topic[0] == 0 && sub[0] == 0){
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*result = true;
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return MOSQ_ERR_SUCCESS;
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}
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}else if(sub[0] == '#'){
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/* Check for bad "foo#" subscription */
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if(spos > 0 && sub[-1] != '/'){
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return MOSQ_ERR_INVAL;
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}
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/* Check for # not the final character of the sub, e.g. "#foo" */
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if(sub[1] != 0){
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return MOSQ_ERR_INVAL;
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}else{
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*result = true;
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return MOSQ_ERR_SUCCESS;
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}
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}else{
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/* Check for e.g. foo/bar matching foo/+/# */
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if(topic[0] == 0
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&& spos > 0
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&& sub[-1] == '+'
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&& sub[0] == '/'
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&& sub[1] == '#')
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{
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*result = true;
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return MOSQ_ERR_SUCCESS;
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}
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/* There is no match at this point, but is the sub invalid? */
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while(sub[0] != 0){
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if(sub[0] == '#' && sub[1] != 0){
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return MOSQ_ERR_INVAL;
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}
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spos++;
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sub++;
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}
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/* Valid input, but no match */
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return MOSQ_ERR_SUCCESS;
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}
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}else{
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/* sub[spos] == topic[tpos] */
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if(topic[1] == 0){
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/* Check for e.g. foo matching foo/# */
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if(sub[1] == '/'
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&& sub[2] == '#'
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&& sub[3] == 0){
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*result = true;
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return MOSQ_ERR_SUCCESS;
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}
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}
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spos++;
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sub++;
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topic++;
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if(sub[0] == 0 && topic[0] == 0){
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*result = true;
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return MOSQ_ERR_SUCCESS;
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}else if(topic[0] == 0 && sub[0] == '+' && sub[1] == 0){
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if(spos > 0 && sub[-1] != '/'){
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return MOSQ_ERR_INVAL;
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}
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spos++;
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sub++;
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*result = true;
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return MOSQ_ERR_SUCCESS;
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}
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}
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}
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if((topic[0] != 0 || sub[0] != 0)){
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*result = false;
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}
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return MOSQ_ERR_SUCCESS;
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}
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