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mqtt: parse properties in MQTT 5.0 CONNACK packets

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Under MQTT 5.0, decode the property length and set props_start and
props_size for MQTT_CMD_CONNACK. Add unit test coverage.
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jnnrgd committed 2026-09-30 10:51:41 +02:00
1 parent 8e0c765c2c
commit 1f2b14bb66
3 files changed
+27
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src/mqtt.c
+10
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@@ -438,6 +438,16 @@ int mg_mqtt_parse(const uint8_t *buf, size_t len, uint8_t version,
case MQTT_CMD_CONNACK:
if (end - p < 2) return MQTT_MALFORMED;
m->ack = p[1];
p += 2;
if (version == 5) {
if (p >= end) return MQTT_MALFORMED;
len_len = (uint32_t) decode_varint(p, (size_t) (end - p), &tmp);
if (!len_len) return MQTT_MALFORMED;
m->props_size = (size_t) tmp;
m->props_start = (size_t) (p + len_len - buf);
p += len_len + m->props_size;
if (p > end) return MQTT_MALFORMED;
}
break;
case MQTT_CMD_PUBACK:
case MQTT_CMD_PUBREC: