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
232
233
234
235
236
|
/******************************************************************************
*
* Copyright (C) 2013 Google, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
#define LOG_TAG "bt_snoop_net"
#include <assert.h>
#include <cutils/sockets.h>
#include <sys/un.h>
#include <sys/poll.h>
#include <errno.h>
#include <netinet/in.h>
#include <pthread.h>
#include <stdbool.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include "osi/include/osi.h"
#include "osi/include/log.h"
static void safe_close_(int *fd);
static void *listen_fn_(void *context);
static const char *LISTEN_THREAD_NAME_ = "btsnoop_net_listen";
static const int LOCALHOST_ = 0x7F000001;
static const int LISTEN_PORT_ = 8872;
static pthread_t listen_thread_;
static bool listen_thread_valid_ = false;
static pthread_mutex_t client_socket_lock_ = PTHREAD_MUTEX_INITIALIZER;
static int listen_socket_ = -1;
int client_socket_btsnoop = -1;
/*
local socket for writing from different process
to limit blocking of HCI threads.
*/
#define LOCAL_SOCKET_NAME "bthcitraffic"
static int listen_socket_local_ = -1;
static int local_socket_create(void) {
int conn_sk, length;
listen_socket_local_ = socket(AF_LOCAL, SOCK_STREAM, 0);
if(listen_socket_local_ < 0) {
return -1;
}
if(socket_local_server_bind(listen_socket_local_, LOCAL_SOCKET_NAME,
ANDROID_SOCKET_NAMESPACE_ABSTRACT) < 0) {
LOG_ERROR("Failed to create Local Socket (%s)", strerror(errno));
return -1;
}
if (listen(listen_socket_local_, 1) < 0) {
LOG_ERROR("Local socket listen failed (%s)", strerror(errno));
close(listen_socket_local_);
return -1;
}
return listen_socket_local_;
}
void btsnoop_net_open() {
listen_thread_valid_ = (pthread_create(&listen_thread_, NULL, listen_fn_, NULL) == 0);
if (!listen_thread_valid_) {
LOG_ERROR("%s pthread_create failed: %s", __func__, strerror(errno));
} else {
LOG_DEBUG("initialized");
}
}
void btsnoop_net_close() {
if (listen_thread_valid_) {
#if (defined(BT_NET_DEBUG) && (NET_DEBUG == TRUE))
// Disable using network sockets for security reasons
shutdown(listen_socket_, SHUT_RDWR);
#endif
shutdown(listen_socket_local_, SHUT_RDWR);
pthread_join(listen_thread_, NULL);
safe_close_(&client_socket_btsnoop);
listen_thread_valid_ = false;
}
}
void btsnoop_net_write(const void *data, size_t length) {
ssize_t ret;
pthread_mutex_lock(&client_socket_lock_);
if (client_socket_btsnoop != -1) {
do {
if ((ret = TEMP_FAILURE_RETRY(send(client_socket_btsnoop, data, length, 0))) == -1 && errno == ECONNRESET) {
safe_close_(&client_socket_btsnoop);
LOG_INFO("%s conn closed", __func__);
}
if (ret < length) {
LOG_ERROR("%s: send : not able to write complete packet", __func__);
}
length -= ret;
} while ((length > 0) && (ret != -1));
}
pthread_mutex_unlock(&client_socket_lock_);
}
static void *listen_fn_(UNUSED_ATTR void *context) {
fd_set sock_fds;
int fd_max = -1, retval;
prctl(PR_SET_NAME, (unsigned long)LISTEN_THREAD_NAME_, 0, 0, 0);
FD_ZERO(&sock_fds);
#if (defined(BT_NET_DEBUG) && (NET_DEBUG == TRUE))
// Disable using network sockets for security reasons
listen_socket_ = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (listen_socket_ == -1) {
LOG_ERROR("%s socket creation failed: %s", __func__, strerror(errno));
goto cleanup;
}
FD_SET(listen_socket_, &sock_fds);
fd_max = listen_socket_;
int enable = 1;
if (setsockopt(listen_socket_, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)) == -1) {
LOG_ERROR("%s unable to set SO_REUSEADDR: %s", __func__, strerror(errno));
goto cleanup;
}
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(LOCALHOST_);
addr.sin_port = htons(LISTEN_PORT_);
if (bind(listen_socket_, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
LOG_ERROR("%s unable to bind listen socket: %s", __func__, strerror(errno));
goto cleanup;
}
if (listen(listen_socket_, 10) == -1) {
LOG_ERROR("%s unable to listen: %s", __func__, strerror(errno));
goto cleanup;
}
#endif
if (local_socket_create() != -1) {
if (listen_socket_local_ > fd_max) {
fd_max = listen_socket_local_;
}
FD_SET(listen_socket_local_, &sock_fds);
}
if (fd_max == -1) {
LOG_ERROR("%s No sockets to wait for conn..", __func__);
return NULL;
}
for (;;) {
int client_socket = -1;
LOG_DEBUG("waiting for client connection");
if ((retval = select(fd_max + 1, &sock_fds, NULL, NULL, NULL)) == -1) {
LOG_ERROR("%s select failed %s", __func__, strerror(errno));
goto cleanup;
}
if ((listen_socket_ != -1) && FD_ISSET(listen_socket_, &sock_fds)) {
client_socket = TEMP_FAILURE_RETRY(accept(listen_socket_, NULL, NULL));
if (client_socket == -1) {
if (errno == EINVAL || errno == EBADF) {
LOG_WARN("%s error accepting TCP socket: %s", __func__, strerror(errno));
break;
}
LOG_WARN("%s error accepting TCP socket: %s", __func__, strerror(errno));
continue;
}
} else if ((listen_socket_local_ != -1) && FD_ISSET(listen_socket_local_, &sock_fds)){
struct sockaddr_un cliaddr;
int length;
client_socket = TEMP_FAILURE_RETRY(accept(listen_socket_local_, (struct sockaddr *)&cliaddr, &length));
if (client_socket == -1) {
if (errno == EINVAL || errno == EBADF) {
LOG_WARN("%s error accepting LOCAL socket: %s", __func__, strerror(errno));
break;
}
LOG_WARN("%s error accepting LOCAL socket: %s", __func__, strerror(errno));
continue;
}
}
/* When a new client connects, we have to send the btsnoop file header. This allows
a decoder to treat the session as a new, valid btsnoop file. */
pthread_mutex_lock(&client_socket_lock_);
safe_close_(&client_socket_btsnoop);
client_socket_btsnoop = client_socket;
TEMP_FAILURE_RETRY(send(client_socket_btsnoop, "btsnoop\0\0\0\0\1\0\0\x3\xea", 16, 0));
pthread_mutex_unlock(&client_socket_lock_);
FD_ZERO(&sock_fds);
if(listen_socket_ != -1) {
FD_SET(listen_socket_, &sock_fds);
}
if(listen_socket_local_ != -1) {
FD_SET(listen_socket_local_, &sock_fds);
}
}
cleanup:
safe_close_(&listen_socket_);
safe_close_(&listen_socket_local_);
return NULL;
}
static void safe_close_(int *fd) {
assert(fd != NULL);
if (*fd != -1) {
close(*fd);
*fd = -1;
}
}
|
