/**
* Receive data from a device via the given connection.
* This function is like idevice_connection_receive_timeout, but with a
* predefined reasonable timeout.
*
* @param connection The connection to receive data from.
* @param data Buffer that will be filled with the received data.
* This buffer has to be large enough to hold len bytes.
* @param len Buffer size or number of bytes to receive.
* @param recv_bytes Number of bytes actually received.
*
* @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
*/
idevice_error_t idevice_connection_receive(idevice_connection_t connection, char *data, uint32_t len, uint32_t *recv_bytes)
{
if (!connection || (connection->ssl_data && !connection->ssl_data->session)) {
return IDEVICE_E_INVALID_ARG;
}
if (connection->ssl_data) {
ssize_t received = gnutls_record_recv(connection->ssl_data->session, (void*)data, (size_t)len);
if (received > 0) {
*recv_bytes = received;
return IDEVICE_E_SUCCESS;
}
*recv_bytes = 0;
return IDEVICE_E_SSL_ERROR;
}
return internal_connection_receive(connection, data, len, recv_bytes);
}
/**
* Internally used gnutls callback function for receiving encrypted data.
*/
static ssize_t internal_ssl_read(gnutls_transport_ptr_t transport, char *buffer, size_t length)
{
int bytes = 0, pos_start_fill = 0;
size_t tbytes = 0;
int this_len = length;
idevice_error_t res;
idevice_connection_t connection = (idevice_connection_t)transport;
char *recv_buffer;
debug_info("pre-read client wants %zi bytes", length);
recv_buffer = (char *)malloc(sizeof(char) * this_len);
/* repeat until we have the full data or an error occurs */
do {
if ((res = internal_connection_receive(connection, recv_buffer, this_len, (uint32_t*)&bytes)) != IDEVICE_E_SUCCESS) {
debug_info("ERROR: idevice_connection_receive returned %d", res);
return res;
}
debug_info("post-read we got %i bytes", bytes);
/* increase read count */
tbytes += bytes;
/* fill the buffer with what we got right now */
memcpy(buffer + pos_start_fill, recv_buffer, bytes);
pos_start_fill += bytes;
if (tbytes >= length) {
break;
}
this_len = length - tbytes;
debug_info("re-read trying to read missing %i bytes", this_len);
} while (tbytes < length);
if (recv_buffer) {
free(recv_buffer);
}
return tbytes;
}
idevice_error_t idevice_connection_receive(idevice_connection_t connection, char *data, uint32_t len, uint32_t *recv_bytes)
{
if (!connection || (connection->ssl_data && !connection->ssl_data->session)) {
return IDEVICE_E_INVALID_ARG;
}
if (connection->ssl_data) {
#ifdef HAVE_OPENSSL
int received = SSL_read(connection->ssl_data->session, (void*)data, (int)len);
debug_info("SSL_read %d, received %d", len, received);
#else
ssize_t received = gnutls_record_recv(connection->ssl_data->session, (void*)data, (size_t)len);
#endif
if (received > 0) {
*recv_bytes = received;
return IDEVICE_E_SUCCESS;
}
*recv_bytes = 0;
return IDEVICE_E_SSL_ERROR;
}
return internal_connection_receive(connection, data, len, recv_bytes);
}