Re: [PATCH_v3 1/4] android/hal-health: Add HDP .register_application method

[Szymon Janc <szymon.janc@tieto.com>]

Hi Ravi,

On Friday 14 of March 2014 15:30:55 Ravi kumar Veeramally wrote:
> ---
>  android/hal-health.c | 109
> ++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 108
> insertions(+), 1 deletion(-)
> 
> diff --git a/android/hal-health.c b/android/hal-health.c
> index 918fb69..6e0f731 100644
> --- a/android/hal-health.c
> +++ b/android/hal-health.c
> @@ -38,6 +38,113 @@ static bool interface_ready(void)
>  static const struct hal_ipc_handler ev_handlers[] = {
>  };
> 
> +static bt_status_t register_application(bthl_reg_param_t *reg, int *app_id)
> +{
> +	char buf[IPC_MTU];
> +	struct hal_cmd_health_reg_app *cmd = (void *) buf;
> +	struct hal_rsp_health_reg_app rsp;
> +	size_t len = sizeof(rsp);
> +	bt_status_t status;
> +	ssize_t cmd_len;
> +	uint8_t i;
> +
> +	DBG("");
> +
> +	if (!interface_ready())
> +		return BT_STATUS_NOT_READY;
> +
> +	if (!reg || !app_id)
> +		return BT_STATUS_PARM_INVALID;
> +
> +

Double empty line here.

> +	cmd_len = sizeof(*cmd);
> +
> +	if (reg->application_name)
> +		cmd_len += strlen(reg->application_name) + 1;
> +
> +	if (reg->provider_name)
> +		cmd_len += strlen(reg->provider_name) + 1;
> +
> +	if (reg->srv_name)
> +		cmd_len += strlen(reg->srv_name) + 1;
> +
> +	if (reg->srv_desp)
> +		cmd_len += strlen(reg->srv_desp) + 1;
> +
> +	if (reg->number_of_mdeps > 0 && reg->mdep_cfg[0].mdep_description)
> +		cmd_len += strlen(reg->mdep_cfg[0].mdep_description) + 1;
> +
> +	for (i = 1; i < reg->number_of_mdeps; i++)
> +		cmd_len += sizeof(cmd->mdep_cfg) +
> +				strlen(reg->mdep_cfg[i].mdep_description) + 1;
> +
> +	if (cmd_len > IPC_MTU) {
> +		error("HDP app registration data length is more than IPC_MTU");
> +		return BT_STATUS_PARM_INVALID;
> +	}
> +
> +	if (reg->application_name) {
> +		cmd->app_name.len = strlen(reg->application_name);
> +		memcpy(cmd->app_name.data, reg->application_name,
> +						cmd->app_name.len);

You are missing to copy NULL byte here and since buf is not zeroed those 
strings likely wont be NULL terminated.

So I think to avoid such problems in future we should have some simple helpers 
for creating hal_string. Also there is no need to calculate those strings 
lengths twice.

So that we could have something like (feel free to propose better API if this 
doesn't suites you).

bool string_to_hal(const char *str, struct hal_str *hstr, uint16_t *len);

if (!string_to_hal(reg->application_name, &hal_str, *cmd_len)
   goto failed;

> +	} else {
> +		cmd->app_name.len = 0;
> +	}
> +
> +	if (reg->provider_name) {
> +		cmd->provider_name.len = strlen(reg->provider_name);
> +		memcpy(cmd->provider_name.data, reg->provider_name,
> +						cmd->provider_name.len);
> +	} else {
> +		cmd->provider_name.len = 0;
> +	}
> +
> +	if (reg->srv_name) {
> +		cmd->service_name.len = strlen(reg->srv_name);
> +		memcpy(cmd->service_name.data, reg->srv_name,
> +						cmd->service_name.len);
> +	} else {
> +		cmd->service_name.len = 0;
> +	}
> +
> +	if (reg->srv_desp) {
> +		cmd->service_descr.len = strlen(reg->srv_desp);
> +		memcpy(cmd->service_descr.data, reg->srv_desp,
> +						cmd->service_descr.len);
> +	} else {
> +		cmd->service_descr.len = 0;
> +	}
> +
> +	cmd->num_of_mdep = reg->number_of_mdeps;
> +
> +	if (reg->mdep_cfg && reg->number_of_mdeps > 0) {
> +		for (i = 0; i < reg->number_of_mdeps; i++) {
> +			cmd->mdep_cfg[i].role = reg->mdep_cfg[i].mdep_role;
> +			cmd->mdep_cfg[i].data_type = reg->mdep_cfg[i].data_type;
> +			cmd->mdep_cfg[i].channel_type =
> +						reg->mdep_cfg[i].channel_type;
> +
> +			if (cmd->mdep_cfg[i].descr.data) {
> +				cmd->mdep_cfg[i].descr.len =
> +				strlen(reg->mdep_cfg[i].mdep_description);
> +				memcpy(cmd->mdep_cfg[i].descr.data,
> +					reg->mdep_cfg[i].mdep_description,
> +						cmd->mdep_cfg[i].descr.len);
> +			} else {
> +				cmd->mdep_cfg[i].descr.len = 0;
> +			}
> +		}
> +	}
> +
> +	status = hal_ipc_cmd(HAL_SERVICE_ID_HEALTH, HAL_OP_HEALTH_REG_APP,
> +						cmd_len, cmd, &len, &rsp, NULL);
> +
> +	if (status == HAL_STATUS_SUCCESS)
> +		*app_id = rsp.app_id;
> +
> +	return status;
> +}
> +
>  static bt_status_t init(bthl_callbacks_t *callbacks)
>  {
>  	struct hal_cmd_register_module cmd;
> @@ -89,7 +196,7 @@ static void cleanup(void)
>  static bthl_interface_t health_if = {
>  	.size = sizeof(health_if),
>  	.init = init,
> -	.register_application = NULL,
> +	.register_application = register_application,
>  	.unregister_application = NULL,
>  	.connect_channel = NULL,
>  	.destroy_channel = NULL,

-- 
BR
Szymon Janc