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-rw-r--r--contrib/gprs/gprs-buffer-count.lua80
1 files changed, 80 insertions, 0 deletions
diff --git a/contrib/gprs/gprs-buffer-count.lua b/contrib/gprs/gprs-buffer-count.lua
new file mode 100644
index 00000000..ca8864ad
--- /dev/null
+++ b/contrib/gprs/gprs-buffer-count.lua
@@ -0,0 +1,80 @@
+-- I count the buffer space needed for LLC PDUs in the worse case and print it
+
+do
+ local function init_listener()
+ -- handle the port as NS over IP
+ local udp_port_table = DissectorTable.get("udp.port")
+ local gprs_ns_dis = Dissector.get("gprs_ns")
+ udp_port_table:add(23000,gprs_ns_dis)
+
+ -- bssgp filters
+ local bssgp_pdu_get = Field.new("bssgp.pdu_type")
+ local bssgp_delay_get = Field.new("bssgp.delay_val")
+ local llcgprs_get = Field.new("llcgprs")
+ local pdus = nil
+
+ print("START...")
+
+ local tap = Listener.new("ip", "udp.port == 23000 && bssgp.pdu_type == 0")
+ function tap.packet(pinfo,tvb,ip)
+ local pdu = bssgp_pdu_get()
+ local len = llcgprs_get().len
+ local delay = bssgp_delay_get()
+
+ -- only handle bssgp, but we also want the IP frame
+ if not pdu then
+ return
+ end
+
+ if tonumber(tostring(delay)) == 65535 then
+ pdus = { next = pdus,
+ len = len,
+ expires = -1 }
+ else
+ local off = tonumber(tostring(delay)) / 100.0
+ pdus = { next = pdus,
+ len = len,
+ expires = pinfo.rel_ts + off }
+ end
+ local now_time = tonumber(tostring(pinfo.rel_ts))
+ local now_size = 0
+ local l = pdus
+ local prev = nil
+ local count = 0
+ while l do
+ if now_time < l.expires or l.expires == -1 then
+ now_size = now_size + l.len
+ prev = l
+ l = l.next
+ count = count + 1
+ else
+ -- delete things
+ if prev == nil then
+ pdus = nil
+ l = nil
+ else
+ prev.next = l.next
+ l = l.next
+ end
+ end
+ end
+-- print("TOTAL: " .. now_time .. " PDU_SIZE: " .. now_size)
+ print(now_time .. " " .. now_size / 1024.0 .. " " .. count)
+-- print("NOW: " .. tostring(pinfo.rel_ts) .. " Delay: " .. tostring(delay) .. " Length: " .. tostring(len))
+ end
+
+ function tap.draw()
+ -- well... this will not be called...
+-- for ip,bssgp_histo in pairs(dumpers) do
+-- print("IP " .. ip)
+-- end
+ print("END")
+ end
+
+ function tap.reset()
+ -- well... this will not be called...
+ end
+ end
+
+ init_listener()
+end