3 from subprocess import call, Popen, PIPE, STDOUT, check_output
4 import paho.mqtt.client as mqtt
7 from uuid import getnode as get_mac
12 MQTT_SERVER = 'mqtt.suanzi.ai'
15 # The alive time new ssh session exist. It means if no client connect to this device through ssh tunnel in 5 minutes,
16 # this new sessin will terminate.
19 SSH_SERVER = 'autossh.suanzi.ai'
20 PORT_RANGE = (20000, 40000)
22 PASSWORD = 'hard2guess'
24 def getAvailablePort(host, ports):
26 port = random.randint(ports[0], ports[1])
27 command = 'nc -z -v -w3 ' + host + ' ' + str(port)
28 p = Popen(command, shell=True, stdout=PIPE, stderr=STDOUT)
29 pout = p.communicate()[0].strip()
32 if 'Connection refused' in pout:
39 m = re.sub('^0x|L$', '', mac)
40 return '{:0>12}'.format(m)
43 return check_output("/bin/hostname", shell=True).strip();
45 def check_ssh_connection(port):
46 command = '/bin/ps aux | /bin/grep -E \'ssh.*' + str(port) + '\' | /bin/grep -v grep | wc -l';
47 output = check_output(command, shell=True)
48 print 'output: ', output
55 pub = os.getenv('HOME') + "/.ssh/id_rsa.pub"
56 if not os.path.isfile(pub):
58 command = 'ssh-keygen -b 2048 -t rsa -f ~/.ssh/id_rsa -P ""'
60 print call(command, shell=True)
62 command = 'sshpass -p' + PASSWORD + ' ssh-copy-id -o "StrictHostKeyChecking=no" -o "UserKnownHostsFile /dev/null" ' + USER + '@' + SSH_SERVER
64 print call(command, shell=True)
69 print "#### start establish ssh forwarding connection port, ", port
71 raise Exception('Port not avaliable')
72 command = 'sshpass -p' + PASSWORD + ' ssh -o "StrictHostKeyChecking=no" -o "UserKnownHostsFile /dev/null" -o "ServerAliveInterval 60" -o "ServerAliveCountMax 3" -fCR ' + str(port) +':localhost:22 ' + USER + '@' + SSH_SERVER + ' sleep ' + str(ALIVE_TIME)
74 ret = call(shlex.split(command), shell=False)
75 if check_ssh_connection(port):
77 else: ## if sshpass fails (sometimes when another process has large CPU usage (100%) , no ssh connection, try another,
79 command = 'ssh -o "PasswordAuthentication=no" -o "StrictHostKeyChecking=no" -o "UserKnownHostsFile /dev/null" -o "ServerAliveInterval 60" -o "ServerAliveCountMax 3" -fCR ' + str(port) +':localhost:22 ' + USER + '@' + SSH_SERVER + ' sleep ' + str(ALIVE_TIME)
81 ret = call(shlex.split(command), shell=False)
84 def on_connect(client, userdata, flags, rc):
85 client.subscribe(userdata['id'])
86 client.subscribe('all')
87 print("Connected with result code "+str(rc))
89 def on_message(client, userdata, msg):
90 print('Receive topic:' + msg.topic + ' payload: ' +str(msg.payload))
91 payload = ast.literal_eval(str(msg.payload))
92 from_id = payload['from']
93 if payload['type'] == 'request':
94 if payload['command'] == 'ssh':
95 port = getAvailablePort(SSH_SERVER, PORT_RANGE)
96 if exec_ssh(port) == 0:
97 print "#### OK, SSH forwarding connection established, port, ", port
98 response = {'from': userdata['id'], 'type':'response', 'command':payload['command'], 'data':port}
99 client.publish(payload['from'], str(response))
101 raise Exception ('run ssh failed')
102 if payload['command'] == 'list':
103 response = {'from': userdata['id'], 'type':'response', 'command':payload['command'], 'data': get_hostname()}
104 client.publish(payload['from'], str(response))
108 if __name__ == '__main__':
111 client = mqtt.Client(userdata={'id':id})
112 client.on_connect = on_connect
113 client.on_message = on_message
114 client.connect(MQTT_SERVER, MQTT_PORT, 60)
115 client.loop_forever()