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Use MQTT_MAX_TOPIC_LEN in places where it was not used before to avoid buffer overflows when value is increased

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This commit is contained in:
Wouter Gritter 2024-11-20 12:39:39 +01:00
parent 4cd4c13b2d
commit 0160e3fa87
3 changed files with 19 additions and 19 deletions
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8
wled00/button.cpp
View File

@ -29,7 +29,7 @@ void shortPressAction(uint8_t b)
#ifndef WLED_DISABLE_MQTT
// publish MQTT message
if (buttonPublishMqtt && WLED_MQTT_CONNECTED) {
char subuf[64];
char subuf[MQTT_MAX_TOPIC_LEN + 32];
sprintf_P(subuf, _mqtt_topic_button, mqttDeviceTopic, (int)b);
mqtt->publish(subuf, 0, false, "short");
}
@ -62,7 +62,7 @@ void longPressAction(uint8_t b)
#ifndef WLED_DISABLE_MQTT
// publish MQTT message
if (buttonPublishMqtt && WLED_MQTT_CONNECTED) {
char subuf[64];
char subuf[MQTT_MAX_TOPIC_LEN + 32];
sprintf_P(subuf, _mqtt_topic_button, mqttDeviceTopic, (int)b);
mqtt->publish(subuf, 0, false, "long");
}
@ -83,7 +83,7 @@ void doublePressAction(uint8_t b)
#ifndef WLED_DISABLE_MQTT
// publish MQTT message
if (buttonPublishMqtt && WLED_MQTT_CONNECTED) {
char subuf[64];
char subuf[MQTT_MAX_TOPIC_LEN + 32];
sprintf_P(subuf, _mqtt_topic_button, mqttDeviceTopic, (int)b);
mqtt->publish(subuf, 0, false, "double");
}
@ -151,7 +151,7 @@ void handleSwitch(uint8_t b)
#ifndef WLED_DISABLE_MQTT
// publish MQTT message
if (buttonPublishMqtt && WLED_MQTT_CONNECTED) {
char subuf[64];
char subuf[MQTT_MAX_TOPIC_LEN + 32];
if (buttonType[b] == BTN_TYPE_PIR_SENSOR) sprintf_P(subuf, PSTR("%s/motion/%d"), mqttDeviceTopic, (int)b);
else sprintf_P(subuf, _mqtt_topic_button, mqttDeviceTopic, (int)b);
mqtt->publish(subuf, 0, false, !buttonPressedBefore[b] ? "off" : "on");

22
wled00/mqtt.cpp
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@ -23,24 +23,24 @@ static void parseMQTTBriPayload(char* payload)
static void onMqttConnect(bool sessionPresent)
{
//(re)subscribe to required topics
char subuf[38];
char subuf[MQTT_MAX_TOPIC_LEN + 6];
if (mqttDeviceTopic[0] != 0) {
strlcpy(subuf, mqttDeviceTopic, 33);
strlcpy(subuf, mqttDeviceTopic, MQTT_MAX_TOPIC_LEN + 1);
mqtt->subscribe(subuf, 0);
strcat_P(subuf, PSTR("/col"));
mqtt->subscribe(subuf, 0);
strlcpy(subuf, mqttDeviceTopic, 33);
strlcpy(subuf, mqttDeviceTopic, MQTT_MAX_TOPIC_LEN + 1);
strcat_P(subuf, PSTR("/api"));
mqtt->subscribe(subuf, 0);
}
if (mqttGroupTopic[0] != 0) {
strlcpy(subuf, mqttGroupTopic, 33);
strlcpy(subuf, mqttGroupTopic, MQTT_MAX_TOPIC_LEN + 1);
mqtt->subscribe(subuf, 0);
strcat_P(subuf, PSTR("/col"));
mqtt->subscribe(subuf, 0);
strlcpy(subuf, mqttGroupTopic, 33);
strlcpy(subuf, mqttGroupTopic, MQTT_MAX_TOPIC_LEN + 1);
strcat_P(subuf, PSTR("/api"));
mqtt->subscribe(subuf, 0);
}
@ -158,19 +158,19 @@ void publishMqtt()
#ifndef USERMOD_SMARTNEST
char s[10];
char subuf[48];
char subuf[MQTT_MAX_TOPIC_LEN + 16];
sprintf_P(s, PSTR("%u"), bri);
strlcpy(subuf, mqttDeviceTopic, 33);
strlcpy(subuf, mqttDeviceTopic, MQTT_MAX_TOPIC_LEN + 1);
strcat_P(subuf, PSTR("/g"));
mqtt->publish(subuf, 0, retainMqttMsg, s); // optionally retain message (#2263)
sprintf_P(s, PSTR("#%06X"), (col[3] << 24) | (col[0] << 16) | (col[1] << 8) | (col[2]));
strlcpy(subuf, mqttDeviceTopic, 33);
strlcpy(subuf, mqttDeviceTopic, MQTT_MAX_TOPIC_LEN + 1);
strcat_P(subuf, PSTR("/c"));
mqtt->publish(subuf, 0, retainMqttMsg, s); // optionally retain message (#2263)
strlcpy(subuf, mqttDeviceTopic, 33);
strlcpy(subuf, mqttDeviceTopic, MQTT_MAX_TOPIC_LEN + 1);
strcat_P(subuf, PSTR("/status"));
mqtt->publish(subuf, 0, true, "online"); // retain message for a LWT
@ -178,7 +178,7 @@ void publishMqtt()
DynamicBuffer buf(1024);
bufferPrint pbuf(buf.data(), buf.size());
XML_response(pbuf);
strlcpy(subuf, mqttDeviceTopic, 33);
strlcpy(subuf, mqttDeviceTopic, MQTT_MAX_TOPIC_LEN + 1);
strcat_P(subuf, PSTR("/v"));
mqtt->publish(subuf, 0, retainMqttMsg, buf.data(), pbuf.size()); // optionally retain message (#2263)
#endif
@ -211,7 +211,7 @@ bool initMqtt()
if (mqttUser[0] && mqttPass[0]) mqtt->setCredentials(mqttUser, mqttPass);
#ifndef USERMOD_SMARTNEST
strlcpy(mqttStatusTopic, mqttDeviceTopic, 33);
strlcpy(mqttStatusTopic, mqttDeviceTopic, MQTT_MAX_TOPIC_LEN + 1);
strcat_P(mqttStatusTopic, PSTR("/status"));
mqtt->setWill(mqttStatusTopic, 0, true, "offline"); // LWT message
#endif

2
wled00/wled.h
View File

@ -483,7 +483,7 @@ WLED_GLOBAL unsigned long lastMqttReconnectAttempt _INIT(0); // used for other
#endif
WLED_GLOBAL AsyncMqttClient *mqtt _INIT(NULL);
WLED_GLOBAL bool mqttEnabled _INIT(false);
WLED_GLOBAL char mqttStatusTopic[40] _INIT(""); // this must be global because of async handlers
WLED_GLOBAL char mqttStatusTopic[MQTT_MAX_TOPIC_LEN + 8] _INIT(""); // this must be global because of async handlers
WLED_GLOBAL char mqttDeviceTopic[MQTT_MAX_TOPIC_LEN + 1] _INIT(""); // main MQTT topic (individual per device, default is wled/mac)
WLED_GLOBAL char mqttGroupTopic[MQTT_MAX_TOPIC_LEN + 1] _INIT("wled/all"); // second MQTT topic (for example to group devices)
WLED_GLOBAL char mqttServer[MQTT_MAX_SERVER_LEN + 1] _INIT(""); // both domains and IPs should work (no SSL)