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/*
* bt_packet_logger.c
* com.apple.bluetooth.BTPacketLogger service implementation.
*
* Copyright (c) 2021 Geoffrey Kruse, All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include <stdlib.h>
#include "bt_packet_logger.h"
#include "lockdown.h"
#include "common/debug.h"
struct bt_packet_logger_worker_thread {
bt_packet_logger_client_t client;
bt_packet_logger_receive_cb_t cbfunc;
void *user_data;
uint8_t rxbuff[BT_MAX_PACKET_SIZE];
};
#define SZ_READ_TIMEOUT 100
#define PAYLOAD_READ_TIMEOUT 500
/**
* Convert a service_error_t value to a bt_packet_logger_error_t value.
* Used internally to get correct error codes.
*
* @param err An service_error_t error code
*
* @return A matching bt_packet_logger_error_t error code,
* BT_PACKET_LOGGER_E_UNKNOWN_ERROR otherwise.
*/
static bt_packet_logger_error_t bt_packet_logger_error(service_error_t err)
{
switch (err) {
case SERVICE_E_SUCCESS:
return BT_PACKET_LOGGER_E_SUCCESS;
case SERVICE_E_INVALID_ARG:
return BT_PACKET_LOGGER_E_INVALID_ARG;
case SERVICE_E_MUX_ERROR:
return BT_PACKET_LOGGER_E_MUX_ERROR;
case SERVICE_E_SSL_ERROR:
return BT_PACKET_LOGGER_E_SSL_ERROR;
case SERVICE_E_NOT_ENOUGH_DATA:
return BT_PACKET_LOGGER_E_NOT_ENOUGH_DATA;
case SERVICE_E_TIMEOUT:
return BT_PACKET_LOGGER_E_TIMEOUT;
default:
break;
}
return BT_PACKET_LOGGER_E_UNKNOWN_ERROR;
}
LIBIMOBILEDEVICE_API bt_packet_logger_error_t bt_packet_logger_client_new(idevice_t device, lockdownd_service_descriptor_t service, bt_packet_logger_client_t * client)
{
if (!device || !service || service->port == 0 || !client || *client) {
debug_info("Incorrect parameter passed to bt_packet_logger_client_new.");
return BT_PACKET_LOGGER_E_INVALID_ARG;
}
debug_info("Creating bt_packet_logger_client, port = %d.", service->port);
service_client_t parent = NULL;
bt_packet_logger_error_t ret = bt_packet_logger_error(service_client_new(device, service, &parent));
if (ret != BT_PACKET_LOGGER_E_SUCCESS) {
debug_info("Creating base service client failed. Error: %i", ret);
return ret;
}
bt_packet_logger_client_t client_loc = (bt_packet_logger_client_t) malloc(sizeof(struct bt_packet_logger_client_private));
client_loc->parent = parent;
client_loc->worker = THREAD_T_NULL;
*client = client_loc;
debug_info("bt_packet_logger_client successfully created.");
return 0;
}
LIBIMOBILEDEVICE_API bt_packet_logger_error_t bt_packet_logger_client_start_service(idevice_t device, bt_packet_logger_client_t * client, const char* label)
{
bt_packet_logger_error_t err = BT_PACKET_LOGGER_E_UNKNOWN_ERROR;
service_client_factory_start_service(device, BT_PACKETLOGGER_SERVICE_NAME, (void**)client, label, SERVICE_CONSTRUCTOR(bt_packet_logger_client_new), &err);
return err;
}
LIBIMOBILEDEVICE_API bt_packet_logger_error_t bt_packet_logger_client_free(bt_packet_logger_client_t client)
{
if (!client)
return BT_PACKET_LOGGER_E_INVALID_ARG;
bt_packet_logger_stop_capture(client);
bt_packet_logger_error_t err = bt_packet_logger_error(service_client_free(client->parent));
free(client);
return err;
}
LIBIMOBILEDEVICE_API bt_packet_logger_error_t bt_packet_logger_receive_with_timeout(bt_packet_logger_client_t client, char* data, uint32_t size, uint32_t *received, unsigned int timeout)
{
bt_packet_logger_error_t res = BT_PACKET_LOGGER_E_UNKNOWN_ERROR;
int bytes = 0;
if (!client || !data || (size == 0)) {
return BT_PACKET_LOGGER_E_INVALID_ARG;
}
res = bt_packet_logger_error(service_receive_with_timeout(client->parent, data, size, (uint32_t*)&bytes, timeout));
if (res != BT_PACKET_LOGGER_E_SUCCESS && res != BT_PACKET_LOGGER_E_TIMEOUT && res != BT_PACKET_LOGGER_E_NOT_ENOUGH_DATA) {
debug_info("Could not read data, error %d", res);
}
if (received) {
*received = (uint32_t)bytes;
}
return res;
}
void *bt_packet_logger_worker(void *arg)
{
bt_packet_logger_error_t ret = BT_PACKET_LOGGER_E_UNKNOWN_ERROR;
struct bt_packet_logger_worker_thread *btwt = (struct bt_packet_logger_worker_thread*)arg;
if (!btwt) {
return NULL;
}
debug_info("Running");
while (btwt->client->parent) {
uint32_t bytes = 0;
uint16_t len;
ret = bt_packet_logger_receive_with_timeout(btwt->client, (char*)&len, 2, &bytes, SZ_READ_TIMEOUT);
if (ret == BT_PACKET_LOGGER_E_TIMEOUT || ret == BT_PACKET_LOGGER_E_NOT_ENOUGH_DATA || ((bytes == 0) && (ret == BT_PACKET_LOGGER_E_SUCCESS))) {
continue;
} else if (ret < 0) {
debug_info("Connection to bt packet logger interrupted");
break;
}
// sanity check received length
if(bytes > 0 && len > sizeof(bt_packet_logger_header_t)) {
debug_info("Reading %u bytes\n", len);
ret = bt_packet_logger_receive_with_timeout(btwt->client, (char *)btwt->rxbuff, len, &bytes, PAYLOAD_READ_TIMEOUT);
if(len != bytes) {
debug_info("Failed Read Expected %u, Received %u\n", len, bytes);
continue;
}
if (ret == BT_PACKET_LOGGER_E_TIMEOUT || ret == BT_PACKET_LOGGER_E_NOT_ENOUGH_DATA || ((bytes == 0) && (ret == BT_PACKET_LOGGER_E_SUCCESS))) {
continue;
} else if (ret < 0) {
debug_info("Connection to bt packet logger interrupted");
break;
}
btwt->cbfunc(btwt->rxbuff, len, btwt->user_data);
}
}
// null check performed above
free(btwt);
debug_info("Exiting");
return NULL;
}
LIBIMOBILEDEVICE_API bt_packet_logger_error_t bt_packet_logger_start_capture(bt_packet_logger_client_t client, bt_packet_logger_receive_cb_t callback, void* user_data)
{
if (!client || !callback)
return BT_PACKET_LOGGER_E_INVALID_ARG;
bt_packet_logger_error_t res = BT_PACKET_LOGGER_E_UNKNOWN_ERROR;
if (client->worker) {
debug_info("Another syslog capture thread appears to be running already.");
return res;
}
/* start worker thread */
struct bt_packet_logger_worker_thread *btwt = (struct bt_packet_logger_worker_thread*)malloc(sizeof(struct bt_packet_logger_worker_thread));
if (btwt) {
btwt->client = client;
btwt->cbfunc = callback;
btwt->user_data = user_data;
if (thread_new(&client->worker, bt_packet_logger_worker, btwt) == 0) {
res = BT_PACKET_LOGGER_E_SUCCESS;
}
}
return res;
}
LIBIMOBILEDEVICE_API bt_packet_logger_error_t bt_packet_logger_stop_capture(bt_packet_logger_client_t client)
{
if (client->worker) {
/* notify thread to finish */
service_client_t parent = client->parent;
client->parent = NULL;
/* join thread to make it exit */
thread_join(client->worker);
thread_free(client->worker);
client->worker = THREAD_T_NULL;
client->parent = parent;
}
return BT_PACKET_LOGGER_E_SUCCESS;
}
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