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
237
238
|
// SPDX-License-Identifier: LGPL-2.1-or-later
/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2013-2014 Intel Corporation. All rights reserved.
*
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <libgen.h>
#include <poll.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifndef WAIT_ANY
#define WAIT_ANY (-1)
#endif
#include "src/shared/mainloop.h"
static char exec_dir[PATH_MAX];
static pid_t daemon_pid = -1;
static pid_t snoop_pid = -1;
static void run_valgrind(char *prg_name)
{
char *prg_argv[6];
char *prg_envp[3];
prg_argv[0] = "/usr/bin/valgrind";
prg_argv[1] = "--leak-check=full";
prg_argv[2] = "--track-origins=yes";
prg_argv[3] = prg_name;
prg_argv[4] = "-d";
prg_argv[5] = NULL;
prg_envp[0] = "G_SLICE=always-malloc";
prg_envp[1] = "G_DEBUG=gc-friendly";
prg_envp[2] = NULL;
execve(prg_argv[0], prg_argv, prg_envp);
}
static void run_bluetoothd(char *prg_name)
{
char *prg_argv[3];
char *prg_envp[1];
prg_argv[0] = prg_name;
prg_argv[1] = "-d";
prg_argv[2] = NULL;
prg_envp[0] = NULL;
execve(prg_argv[0], prg_argv, prg_envp);
}
static void ctl_start(void)
{
char prg_name[PATH_MAX + 11];
pid_t pid;
snprintf(prg_name, sizeof(prg_name), "%s/%s", exec_dir, "bluetoothd");
printf("Starting %s\n", prg_name);
pid = fork();
if (pid < 0) {
perror("Failed to fork new process");
return;
}
if (pid == 0) {
run_valgrind(prg_name);
/* Fallback to no valgrind if running with valgind failed */
run_bluetoothd(prg_name);
exit(0);
}
printf("New process %d created\n", pid);
daemon_pid = pid;
}
static void snoop_start(void)
{
char prg_name[PATH_MAX + 17];
char *prg_argv[3];
char *prg_envp[1];
pid_t pid;
snprintf(prg_name, sizeof(prg_name), "%s/%s", exec_dir,
"bluetoothd-snoop");
prg_argv[0] = prg_name;
prg_argv[1] = "/tmp/btsnoop_hci.log";
prg_argv[2] = NULL;
prg_envp[0] = NULL;
printf("Starting %s\n", prg_name);
pid = fork();
if (pid < 0) {
perror("Failed to fork new process");
return;
}
if (pid == 0) {
execve(prg_argv[0], prg_argv, prg_envp);
exit(0);
}
printf("New process %d created\n", pid);
snoop_pid = pid;
}
static void snoop_stop(void)
{
printf("Stoping %s/%s\n", exec_dir, "bluetoothd-snoop");
kill(snoop_pid, SIGTERM);
}
static void system_socket_callback(int fd, uint32_t events, void *user_data)
{
char buf[4096];
ssize_t len;
if (events & (EPOLLERR | EPOLLHUP)) {
mainloop_remove_fd(fd);
return;
}
len = read(fd, buf, sizeof(buf));
if (len < 0)
return;
printf("Received %s\n", buf);
if (!strcmp(buf, "bluetooth.start=daemon")) {
if (daemon_pid > 0)
return;
ctl_start();
} else if (!strcmp(buf, "bluetooth.start=snoop")) {
if (snoop_pid > 0)
return;
snoop_start();
} else if (!strcmp(buf, "bluetooth.stop=snoop")) {
if (snoop_pid > 0)
snoop_stop();
}
}
static void signal_callback(int signum, void *user_data)
{
switch (signum) {
case SIGINT:
case SIGTERM:
mainloop_quit();
break;
case SIGCHLD:
while (1) {
pid_t pid;
int status;
pid = waitpid(WAIT_ANY, &status, WNOHANG);
if (pid < 0 || pid == 0)
break;
printf("Process %d terminated with status=%d\n",
pid, status);
if (pid == daemon_pid)
daemon_pid = -1;
else if (pid == snoop_pid)
snoop_pid = -1;
}
break;
}
}
int main(int argc, char *argv[])
{
const char SYSTEM_SOCKET_PATH[] = "\0android_system";
struct sockaddr_un addr;
int fd;
mainloop_init();
printf("Android system emulator ver %s\n", VERSION);
snprintf(exec_dir, sizeof(exec_dir), "%s", dirname(argv[0]));
fd = socket(PF_LOCAL, SOCK_DGRAM | SOCK_CLOEXEC, 0);
if (fd < 0) {
perror("Failed to create system socket");
return EXIT_FAILURE;
}
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
memcpy(addr.sun_path, SYSTEM_SOCKET_PATH, sizeof(SYSTEM_SOCKET_PATH));
if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
perror("Failed to bind system socket");
close(fd);
return EXIT_FAILURE;
}
mainloop_add_fd(fd, EPOLLIN, system_socket_callback, NULL, NULL);
/* Make sure bluetoothd creates files with proper permissions */
umask(0177);
return mainloop_run_with_signal(signal_callback, NULL);
}
|
