I am working on a way to control my laptop from my VPS (in python3). So far, I have some code which (on the laptop) accepts batch commands from the server via a socket and (on the server) can send out commands to the specified IP via a socket. My problem is that the IP of my laptop changes as I connect to a different network or after some time due to DHCP.
What I'm working on right now, is a way of sending my current IP to the server (which has a static IP).
The problem is that an IP can vary in length and so I cannot specify the size on the server program.
My code so far is as follows:
Program running on the VPS:
from socket import socket, AF_INET, SOCK_DGRAM, gethostbyname
import sys
#This part is for getting the client IP#
getPORT_NUMBER = 8080
getSIZE = 1024
gethostName = gethostbyname( '0.0.0.0' )
getSocket = socket( AF_INET, SOCK_DGRAM )
getSocket.bind( (hostName, getPORT_NUMBER) )
print("Waiting for client connection on port: {0}\n".format(getPORT_NUMBER))
while True:
(received,addr) = getSocket.recvfrom(getSIZE)
ipGet = received.decode("utf-8")
sys.exit()
#-------------#
PORT = 80
SIZE = 1024
mySocket = socket( AF_INET, SOCK_DGRAM )
mySocket.connect( (SERVER_IP, PORT) )
print ("Ready to send packets to host: {0}, on port {1}".format(SERVER_IP, PORT))
while True:
sendMsg = input('rootApp@' + SERVER_IP + ':~# ')
mySocket.sendto(sendMsg.encode('utf-8'),(SERVER_IP,PORT))
sys.exit()
Code running on my laptop:
from socket import socket, gethostbyname, AF_INET, SOCK_DGRAM, gethostname
import sys
import os
PORT_NUMBER = 80
SIZE = 1024
C_IP = gethostbyname(gethostname())
hostName = gethostbyname( '0.0.0.0' )
#This part is for sending the IP to the server#
SERVER_IP = 'real.server.ip.here'
PORT = 8080
SIZE = 1024
server = socket( AF_INET, SOCK_DGRAM )
server.connect( (SERVER_IP, PORT) )
server.sendto(C_IP.encode('utf-8'),(SERVER_IP,PORT))
#---------------#
mySocket = socket( AF_INET, SOCK_DGRAM )
mySocket.bind( (hostName, PORT_NUMBER) )
print("Listening on port {0}\n".format(PORT_NUMBER))
print('--Command History--')
while True:
(received,addr) = mySocket.recvfrom(SIZE)
command = received.decode("utf-8")
print(command)
os.system(command)
sys.exit()
I am aware that there may be various mistakes in the code and I would appreciate pointing them out however I am mainly looking for an answer to my actual question.
NOTE 1: If someone could include some simple encryption I could use, I would be very grateful.
NOTE 2: Before someone marks this question as a duplicate or gives a link to a similar question, I would like to mention that I have gone through multiple questions and websites which I simply could not understand. I need an answer explained at 'noob-level'.
Thank you in advance :)
-----------SOLUTION-----------
I found a solution mostly thanks to georgexsh (and Google :). While this is probably not the best or most efficient way of doing this, it certainly works (on python3, tested on Win7).
The code is:
Running on the laptop:
from socket import socket, gethostbyname, AF_INET, SOCK_DGRAM, gethostname
import sys
import os
PORT_NUMBER = 80
SIZE = 1024
hostName = gethostbyname( '0.0.0.0' )
#---------------#
print('Connecting to server...')
SERVER_IP = 'real.server.ip.here' # Make sure you edit this
PORT = 8080 # Any port other than the port you set on the other variable
getSIZE = 1
sendConn = 'A'
print('...') # All print() statements are optional
server = socket( AF_INET, SOCK_DGRAM )
server.connect( (SERVER_IP, PORT) )
server.sendto(sendConn.encode('utf-8'),(SERVER_IP, PORT))
print('...')
#---------------#
mySocket = socket( AF_INET, SOCK_DGRAM )
mySocket.bind( (hostName, PORT_NUMBER) )
print('...')
print('Connected!\n')
print("Listening on port {0}\n".format(PORT_NUMBER))
print('--Command History--')
while True:
(received,addr) = mySocket.recvfrom(SIZE)
command = received.decode("utf-8")
print(command)
os.system(command) # Execute the command in cmd. This can be replaced with anything you want your program to do with the data you send.
sys.exit() # Optional
Code running on the VPS:
from socket import socket, AF_INET, SOCK_DGRAM, gethostbyname
import sys
#-------------#
getPORT_NUMBER = 8080 # Port numbers have to match the ones in the code above!
getSIZE = 1
gethostName = gethostbyname( '0.0.0.0' )
getSocket = socket( AF_INET, SOCK_DGRAM )
getSocket.bind( (gethostName, getPORT_NUMBER) )
print("Waiting for connection on port {0}\n".format(getPORT_NUMBER))
dataGet = ''
while dataGet != 'A' :
dataGet, clientAddr = getSocket.recvfrom(getSIZE)
dataGet = dataGet.decode('utf-8')
#-------------#
PORT = 80
SIZE = 1024
SERVER_IP = clientAddr[0] # Important, this caused the error I wrote about in the comments under the answer!
mySocket = socket( AF_INET, SOCK_DGRAM )
mySocket.connect( (SERVER_IP, PORT) )
print ("Ready to communicate with host: {0}, on port {1}".format(SERVER_IP, PORT))
while True:
sendMsg = input('rootApp@' + SERVER_IP + ':~# ') # Input text is editable.
mySocket.sendto(sendMsg.encode('utf-8'),(SERVER_IP,PORT))
sys.exit() # Optional
