Check broker IP conversion. Adjust state machine accordingly
The result of converting the IP address of the broker wasn't checked. As a result, the pointer was left uninitialised and the IPv6 address used for connecting was some random data. The function now returns an error. Before connect_to_broker is called, mqtt_register is executed, which memsets conn to 0, making its state 0 (MQTT_CONN_STATE_ERROR). In order to recover from this error state, the extra check was added in the MQTT_CLIENT_STATE_NEWCONFIG state. This was discovered using [CodeSonar](https://www.grammatech.com/products/codesonar)
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@ -1333,7 +1333,9 @@ mqtt_connect(struct mqtt_connection *conn, char *host, uint16_t port,
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conn->connect_vhdr_flags |= MQTT_VHDR_CLEAN_SESSION_FLAG;
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/* convert the string IPv6 address to a numeric IPv6 address */
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uiplib_ip6addrconv(host, &ip6addr);
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if(uiplib_ip6addrconv(host, &ip6addr) == 0) {
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return MQTT_STATUS_ERROR;
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}
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uip_ipaddr_copy(&(conn->server_ip), ipaddr);
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@ -698,10 +698,15 @@ static void
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connect_to_broker(void)
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{
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/* Connect to MQTT server */
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mqtt_connect(&conn, conf->broker_ip, conf->broker_port,
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conf->pub_interval * 3);
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mqtt_status_t conn_attempt_result = mqtt_connect(&conn, conf->broker_ip,
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conf->broker_port,
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conf->pub_interval * 3);
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state = MQTT_CLIENT_STATE_CONNECTING;
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if(conn_attempt_result == MQTT_STATUS_OK) {
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state = MQTT_CLIENT_STATE_CONNECTING;
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} else {
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state = MQTT_CLIENT_STATE_CONFIG_ERROR;
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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@ -827,8 +832,8 @@ state_machine(void)
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}
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break;
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case MQTT_CLIENT_STATE_NEWCONFIG:
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/* Only update config after we have disconnected */
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if(conn.state == MQTT_CONN_STATE_NOT_CONNECTED) {
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/* Only update config after we have disconnected or in the case of an error */
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if(conn.state == MQTT_CONN_STATE_NOT_CONNECTED || conn.state == MQTT_CONN_STATE_ERROR) {
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update_config();
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DBG("New config\n");
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