45 lines
1.9 KiB
Lua
45 lines
1.9 KiB
Lua
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local payload=APP.data --APP.data
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local payload_len=string.len(payload)
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if (payload_len < 80) then
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return false
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end
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if (APP.context.packet_sum == nil) then
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APP.context.packet_sum = 1
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else
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APP.context.packet_sum = APP.context.packet_sum + 1
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end
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if (APP.context.packet_sum > 50) then
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APP.detach_me()
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return false
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end
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if(APP.context.heartbeat_candidates == nil) then
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APP.context.heartbeat_candidates = {}
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end
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if(APP.context.possible_heartbeat_C2S_flag == nil) then
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APP.context.possible_heartbeat_C2S_flag=0
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end
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if(APP.context.possible_heartbeat_C2S_payload_size == nil) then
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APP.context.possible_heartbeat_C2S_payload_size=0
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end
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if (APP.get_payload_direction() == 1 and payload_len < 400 and payload_len > 150 and APP.context.possible_heartbeat_C2S_flag == 0) then
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APP.context.possible_heartbeat_C2S_payload_size = payload_len
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APP.context.possible_heartbeat_C2S_flag = 1
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end
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if (APP.get_payload_direction() == 1 and payload_len < 400 and payload_len > 150 and APP.context.possible_heartbeat_C2S_flag == 1) then
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APP.context.possible_heartbeat_C2S_payload_size = payload_len
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end
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if (APP.get_payload_direction() == 2 and payload_len < 400 and payload_len > 80 and APP.context.possible_heartbeat_C2S_flag == 1) then
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local possible_heartbeat = '+' .. APP.context.possible_heartbeat_C2S_payload_size .. '-' .. payload_len
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local count = APP.context.heartbeat_candidates[possible_heartbeat] or 0
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if count > 3 then
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APP.log_info("heartbeat find:", possible_heartbeat)
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APP.append_extra_info("heartbeat find:", possible_heartbeat)
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APP.detach_me()
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return true
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else
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APP.context.heartbeat_candidates[possible_heartbeat] = count + 1
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APP.context.possible_heartbeat_C2S_flag = 0
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APP.context.possible_heartbeat_C2S_payload_size = 0
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end
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end
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return false
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