tcp_proxy.py

import sys,socket,threading

def server_loop(local_host,local_port,remote_host,remote_port,receive_first):
    server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    try:
        server.bind((local_host,local_port))
    except Exception,e:
        print("[-]Falha ao ouvir na porta %s: %d"%(local_host,local_port))
        sys.exit(0)
        
    print('[+]listening on %s: %d'%(local_host,local_port))

    server.listen(5)
    while True:
        client_socket,addr = server.accept()
        print("[==>Conexao recebida de %s : %d]"%(addr[0],addr[1]))
        proxy_thread = threading.Thread(target=proxy_handler,args=(client_socket,remote_host,remote_port,receive_first))
        proxy_thread.start()

def main():
    if(len(sys.argv[1:])) != 5:
        print "Usage: ./proxy.py [localhost] [localport] [remotehost][remoteport] [receive_first]"
        print "Example: ./proxy.py 127.0.0.1 9000 10.12.132.1 9000 True"
        sys.exit(0)
        #Configuracao local
        local_host = sys.argv[1]
        local_port = int(sys.argv[2])

        #ALvo remoto
        remote_host = sys.argv[3]
        remote_port = int(sys.argv[4])

        #Proxy conecta e recebe infos
        receive_first = sys.argv[5]

        if("True" in receive_first):
            receive_first = True
        else:
            receive_first = False

         #Liga o soquete hueheue
        server_loop(local_host,local_port,remote_port,receive_first)

main()

def proxy_handler(client_socket,remote_host,remote_port,receive_first):
    remote_socket = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    remote_socket.connect((remote_host,remote_port))
    #Receba infos do fim rda conexao remota se necessario
    if receive_first:
        remote_buffer = receive_from(remote_socket)
        hexdump(remote_buffer)

        remote_buffer = response_handler(remote_buffer)
        if len(remote_buffer):
            print("[<==] Enviando %d bytes para o localhost"%len(remote_buffer))
            client_socket.send(remote_buffer)
            
    while True:
        local_buffer = receive_from(client_socket)
        if(len(local_buffer)):
            print("[==>] Recebido %d bytes from localhost"%len(local_buffer))
            hexdump(local_buffer)
            local_buffer = request_handler(local_buffer)
            remote_socket.send(local_buffer)
            print("[==>] Enviado para o host remoto")
        remote_buffer = receive_from(remote_socket)
        if(len(remote_buffer)):
            print("[<==]Recebido %d bytes do host remoto"%len(remote_buffer))
            hexdump(remote_buffer)
            remote_buffer = response_handler(remote_buffer)
            client_socket.send(remote_buffer)
            print("[<==] Enviado para localhost")

        if not len(local_buffer) or not len(remote_buffer):
            client_socket.close()
            remote_socket.close()
            print("[*] Sem infos. Fechando conexoes")
            break

def hexdump(src, length=16):
    result = []
    digits = 4 if isinstance(src, unicode) else 2
    for i in xrange(0, len(src), length):
        s = src[i:i+length]
        hexa = b' '.join(["%0*X" % (digits, ord(x)) for x in s])
        text = b''.join([x if 0x20 <= ord(x) < 0x7F else b'.' for x in s])
        result.append( b"%04X %-*s %s" % (i, length*(digits + 1), hexa,text) )
    print b'\n'.join(result)

def receive_from(connection):
    buffer = ""
    connection.settimeout(2)
    try:
        while True:
            data = connection.recv(4096)
            if not data:
                break
            buffer += data
    except:
        pass

    return buffer

def request_handler(buffer):
    return buffer

def response_handler(buffer):
    return buffer