Send/receive data with python socket
I have a vpn (using OpenVPN) with mulitple clients connected to a server (at DigitalOcean). The connection is very good and I am able access every client placed behind their respective firewalls when they are connected to their respective routers through ssh. I want to use python scripts to automatically send files from multiple clients to server and vice versa. Here’s the code I am using so far: Server:
#!/usr/bin/env python import socket from threading import Thread from SocketServer import ThreadingMixIn class ClientThread(Thread): def __init__(self,ip,port): Thread.__init__(self) self.ip = ip self.port = port print "[+] New thread started for "+ip+":"+str(port) def run(self): while True: data = conn.recv(2048) if not data: break print "received data:", data conn.send(data) # echo TCP_IP = '0.0.0.0' TCP_PORT = 62 BUFFER_SIZE = 1024 # Normally 1024 tcpsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) tcpsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) tcpsock.bind((TCP_IP, TCP_PORT)) threads = [] while True: tcpsock.listen(4) print "Waiting for incoming connections. " (conn, (ip,port)) = tcpsock.accept() newthread = ClientThread(ip,port) newthread.start() threads.append(newthread) for t in threads: t.join() #!/usr/bin/env python import socket TCP_IP = '10.8.0.1' TCP_PORT = 62 BUFFER_SIZE = 1024 MESSAGE = "Hello, World!" s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((TCP_IP, TCP_PORT)) s.send(MESSAGE) data = s.recv(BUFFER_SIZE) s.close() print "received data:", data The problem is im not able to get a connection. The server only prints «Waiting for incoming connections. » and the client does not seem to find its way to the server. Is there anyone who can take a look at this and give me some feedback on wath I am doing wrong?
Send and receive objects through sockets in Python
I have searched a lot on the Internet, but I haven’t been able to find the solution to send an object over the socket and receive it as is. I know it needs pickling which I have already done. And that converts it to bytes and is received on the other hand. But how can I convert those bytes to that type of object?
process_time_data = (current_process_start_time, current_process_end_time) prepared_process_data = self.prepare_data_to_send(process_time_data) data_string = io.StringIO(prepared_process_data) data_string = pack('>I', len(data_string)) + data_string self.send_to_server(data_string) This is the code which is converting the object to StringIO on the client and sending to the server. And on the server side I am getting bytes. Now I am searching for bytes to be converted to StringIO again so that I can get the object value. In the code, Object is wrapped in StringIO and is being sent over the socket. Is there a better approach? The server-side code is as follows.
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) #server.setblocking(0) server.bind(('127.0.0.1', 50000)) server.listen(5) inputs = [server] outputs = [] message_queues = <> while inputs: readable, writeable, exceptional = select.select(inputs, outputs, inputs) for s in readable: if s is server: connection, client_address = s.accept() print(client_address) connection.setblocking(0) inputs.append(connection) message_queues[connection] = queue.Queue() print('server started. ') else: print('Getting data step 1') raw_msglen = s.recv(4) msglen = unpack('>I', raw_msglen)[0] final_data = b'' while len(final_data) < msglen: data = s.recv(msglen - len(final_data)) if data: #print(data) final_data += data message_queues[s].put(data) if s not in outputs: outputs.append(s) else: if s in outputs: outputs.remove(s) else: break inputs.remove(connection) #s.close() del message_queues[s] process_data = ProcessData() process_screen = ProcessScreen() if final_data is not None: try: deserialized_data = final_data.decode("utf-8") print(deserialized_data) except (EOFError): break else: print('final data is empty.') print(process_data.project_id) print(process_data.start_time) print(process_data.end_time) print(process_data.process_id) def receive_all(server, message_length, message_queues, inputs, outputs): # Helper function to recv message_length bytes or return None if EOF is hit data = b'' while len(data) < message_length: packet = server.recv(message_length - len(data)) if not packet: return None data += packet message_queues[server].put(data) if server not in outputs: outputs.append(server) else: if server in outputs: outputs.remove(server) inputs.remove(server) del message_queues[server] return data def receive_message(server, message_queues, inputs, outputs): # Read message length and unpack it into an integer raw_msglen = receive_all(server, 4, message_queues, inputs, outputs) if not raw_msglen: return None message_length = unpack('>I', raw_msglen)[0] return receive_all(server, message_length, message_queues, inputs, outputs) class ProcessData: process_id = 0 project_id = 0 task_id = 0 start_time = 0 end_time = 0 user_id = 0 weekend_id = 0 # Model class to send image data to the server class ProcessScreen: process_id = 0 image_data = bytearray()