1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
/*
* 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;
}
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;
}
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;
}
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;
}
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;
}
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;
}
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;
}
|
