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annotate server/ts.py @ 21:2029633912c2

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untested simple server proxy code
author Matt Johnston <matt@ucc.asn.au>
date Tue, 22 May 2012 23:45:16 +0800
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children 885532437100
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21
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1 #!/usr/bin/env python2.7
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2
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3 import sys
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4 import httplib
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5
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6 lightblue = None
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7 try:
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8 import lightblue
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9 except ImportError:
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10 import bluetooth
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11
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12 BTADDR = "00:12:03:27:70:88"
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13
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14 def get_socket(addr):
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15 if lightblue:
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16 s = lightblue.socket()
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17 s.connect(addr, 1)
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18 else:
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19 s = bluetooth.BluetoothSocket( bluetooth.RFCOMM )
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20 s.connect((addr, 1))
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21
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22 return s
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23
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24 # from http://blog.stalkr.net/2011/04/pctf-2011-32-thats-no-bluetooth.html
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25 def crc16(buff, crc = 0, poly = 0x8408):
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26     l = len(buff)
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27     i = 0
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28     while i < l:
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29         ch = ord(buff[i])
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30         uc = 0
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31         while uc < 8:
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32             if (crc & 1) ^ (ch & 1):
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33                 crc = (crc >> 1) ^ poly
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34             else:
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35                 crc >>= 1
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36             ch >>= 1
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37             uc += 1
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38         i += 1
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39     return crc
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40
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41
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42 def fetch(sock):
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43 sock.send("fetch\n")
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44
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45 def readline(self):
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46 buf = ''
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47 while true:
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48 c = self.recv(1)
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49 if c == '\r':
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50 continue
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51
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52 buf.append(c)
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53 if c == '\n':
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54 return buf
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55
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56 crc = 0
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57
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58 lines = []
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59 l = readline(sock)
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60 if l != 'START\n':
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61 print>>sys.stderr, "Bad expected START line '%s'\n" % l.rstrip('\n')
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62 return None
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63 crc = crc16(l, crc)
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64 lines.append(l)
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65
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66 while true:
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67 l = readline(sock)
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68
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69 crc = crc16(l, crc)
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70
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71 if l == 'END\n':
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72 break
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73
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74 lines.append(l)
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75
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76 l = readline(sock)
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77 recv_crc = None
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78 try:
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79 k, v = l.rstrip('\n').split('=')
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80 if k == 'CRC':
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81 recv_crc = int(v)
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82 if recv_crc < 0 or recv_crc > 0xffff:
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83 recv_crc = None
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84 except ValueError:
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85 pass
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86
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87 if recv_crc is None:
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88 print>>sys.stderr, "Bad expected CRC line '%s'\n" % l.rstrip('\n')
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89 return None
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90
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91 if recv_crc != crc:
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92 print>>sys.stderr, "Bad CRC: calculated 0x%x vs received 0x%x\n" % (crc, recv_crc)
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93 return None
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94
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95 return ''.join(lines)