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add crc verify

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breakwa11 2015-09-26 22:33:11 +08:00
parent e060fd5b4d
commit f9cdf2090f
1 changed files with 4 additions and 1 deletions
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5
shadowsocks/obfsplugin/http_simple.py
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@ -238,12 +238,15 @@ class random_head(object):
if self.has_sent_header: if self.has_sent_header:
return buf return buf
self.has_sent_header = True self.has_sent_header = True
return os.urandom(common.ord(os.urandom(1)[0]) % 96 + 1) return os.urandom(common.ord(os.urandom(1)[0]) % 96 + 4)
def server_decode(self, buf): def server_decode(self, buf):
if self.has_recv_header: if self.has_recv_header:
return (buf, True, False) return (buf, True, False)
crc = binascii.crc32(buf) & 0xffffffff
if crc != 0xffffffff:
return (buf, True, False)
self.has_recv_header = True self.has_recv_header = True
# (buffer_to_recv, is_need_decrypt, is_need_to_encode_and_send_back) # (buffer_to_recv, is_need_decrypt, is_need_to_encode_and_send_back)
return (b'', False, True) return (b'', False, True)