diff options
Diffstat (limited to 'contrib/gprs/gprs-verify-nu.lua')
| -rw-r--r-- | contrib/gprs/gprs-verify-nu.lua | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/contrib/gprs/gprs-verify-nu.lua b/contrib/gprs/gprs-verify-nu.lua new file mode 100644 index 000000000..e44fdd16f --- /dev/null +++ b/contrib/gprs/gprs-verify-nu.lua @@ -0,0 +1,59 @@ +-- This script verifies that the N(U) is increasing... +-- +do + local nu_state_src = {} + + 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) + + -- we want to look here... + local llc_sapi_get = Field.new("llcgprs.sapib") + local llc_nu_get = Field.new("llcgprs.nu") + local bssgp_tlli_get = Field.new("bssgp.tlli") + + local tap = Listener.new("ip", "udp.port == 23000") + function tap.packet(pinfo,tvb,ip) + local llc_sapi = llc_sapi_get() + local llc_nu = llc_nu_get() + local bssgp_tlli = bssgp_tlli_get() + + if not llc_sapi or not llc_nu or not bssgp_tlli then + return + end + + local ip_src = tostring(ip.ip_src) + local bssgp_tlli = tostring(bssgp_tlli) + local llc_nu = tostring(llc_nu) + local llc_sapi = tostring(llc_sapi) + + local src_key = ip_src .. "-" .. bssgp_tlli .. "-" .. llc_sapi + local last_nu = nu_state_src[src_key] + if not last_nu then + -- print("Establishing mapping for " .. src_key) + nu_state_src[src_key] = llc_nu + return + end + + local function tohex(number) + return string.format("0x%x", tonumber(number)) + end + + nu_state_src[src_key] = llc_nu + if tonumber(last_nu) + 1 ~= tonumber(llc_nu) then + print("JUMP in N(U) on TLLI " .. tohex(bssgp_tlli) .. " and SAPI: " .. llc_sapi .. " src: " .. ip_src) + print("\t last: " .. last_nu .. " now: " .. llc_nu) + end + end + + function tap.draw() + end + + function tap.reset() + end + end + init_listener() +end + |