http_simple: fix no response in some case

verify_simple: check package size minimum 7 bytes

shadowsocks/obfsplugin/http_simple.py

@@ -171,9 +171,10 @@ class http_simple(plain.plain):
             return (b'', True, False)
 
         datas = buf.split(b'\r\n\r\n', 1)
-        if datas and len(datas) > 1:
+        if datas:
             ret_buf = self.get_data_from_http_header(buf)
-            ret_buf += datas[1]
+            if len(datas) > 1:
+                ret_buf += datas[1]
             if len(ret_buf) >= 15:
                 self.has_recv_header = True
                 return (ret_buf, True, False)

shadowsocks/obfsplugin/verify_simple.py

@@ -126,7 +126,7 @@ class verify_simple(verify_base):
         out_buf = b''
         while len(self.recv_buf) > 2:
             length = struct.unpack('>H', self.recv_buf[:2])[0]
-            if length >= 8192:
+            if length >= 8192 or length < 7:
                 self.raw_trans = True
                 self.recv_buf = b''
                 if self.decrypt_packet_num == 0:
@@ -167,7 +167,7 @@ class verify_simple(verify_base):
         out_buf = b''
         while len(self.recv_buf) > 2:
             length = struct.unpack('>H', self.recv_buf[:2])[0]
-            if length >= 8192:
+            if length >= 8192 or length < 7:
                 self.raw_trans = True
                 self.recv_buf = b''
                 if self.decrypt_packet_num == 0:
@@ -223,7 +223,7 @@ class verify_deflate(verify_base):
         out_buf = b''
         while len(self.recv_buf) > 2:
             length = struct.unpack('>H', self.recv_buf[:2])[0]
-            if length >= 32768:
+            if length >= 32768 or length < 6:
                 self.raw_trans = True
                 self.recv_buf = b''
                 if self.decrypt_packet_num == 0:
@@ -255,7 +255,7 @@ class verify_deflate(verify_base):
         out_buf = b''
         while len(self.recv_buf) > 2:
             length = struct.unpack('>H', self.recv_buf[:2])[0]
-            if length >= 32768:
+            if length >= 32768 or length < 6:
                 self.raw_trans = True
                 self.recv_buf = b''
                 if self.decrypt_packet_num == 0:
@@ -424,7 +424,7 @@ class auth_simple(verify_base):
         out_buf = b''
         while len(self.recv_buf) > 2:
             length = struct.unpack('>H', self.recv_buf[:2])[0]
-            if length >= 8192:
+            if length >= 8192 or length < 7:
                 self.raw_trans = True
                 self.recv_buf = b''
                 if self.decrypt_packet_num == 0:
@@ -465,7 +465,7 @@ class auth_simple(verify_base):
         out_buf = b''
         while len(self.recv_buf) > 2:
             length = struct.unpack('>H', self.recv_buf[:2])[0]
-            if length >= 8192:
+            if length >= 8192 or length < 7:
                 self.raw_trans = True
                 self.recv_buf = b''
                 if self.decrypt_packet_num == 0: