tools/testing/selftests/bpf/tcp_server.py

   1 #!/usr/bin/env python3
   2 #
   3 # SPDX-License-Identifier: GPL-2.0
   4 #
   5
   6 import sys, os, os.path, getopt
   7 import socket, time
   8 import subprocess
   9 import select
  10
  11 def read(sock, n):
  12     buf = b''
  13     while len(buf) < n:
  14         rem = n - len(buf)
  15         try: s = sock.recv(rem)
  16         except (socket.error) as e: return b''
  17         buf += s
  18     return buf
  19
  20 def send(sock, s):
  21     total = len(s)
  22     count = 0
  23     while count < total:
  24         try: n = sock.send(s)
  25         except (socket.error) as e: n = 0
  26         if n == 0:
  27             return count;
  28         count += n
  29     return count
  30
  31
  32 SERVER_PORT = 12877
  33 MAX_PORTS = 2
  34
  35 serverPort = SERVER_PORT
  36 serverSocket = None
  37
  38 # create passive socket
  39 serverSocket = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
  40
  41 try: serverSocket.bind(('localhost', 0))
  42 except socket.error as msg:
  43     print('bind fails: ' + str(msg))
  44
  45 sn = serverSocket.getsockname()
  46 serverPort = sn[1]
  47
  48 cmdStr = ("./tcp_client.py %d &") % (serverPort)
  49 os.system(cmdStr)
  50
  51 buf = b''
  52 n = 0
  53 while n < 500:
  54     buf += b'.'
  55     n += 1
  56
  57 serverSocket.listen(MAX_PORTS)
  58 readList = [serverSocket]
  59
  60 while True:
  61     readyRead, readyWrite, inError = \
  62         select.select(readList, [], [], 2)
  63
  64     if len(readyRead) > 0:
  65         waitCount = 0
  66         for sock in readyRead:
  67             if sock == serverSocket:
  68                 (clientSocket, address) = serverSocket.accept()
  69                 address = str(address[0])
  70                 readList.append(clientSocket)
  71             else:
  72                 sock.settimeout(1);
  73                 s = read(sock, 1000)
  74                 n = send(sock, buf)
  75                 sock.close()
  76                 serverSocket.close()
  77                 sys.exit(0)
  78     else:
  79         print('Select timeout!')
  80         sys.exit(1)