39 lines
977 B
Lua
39 lines
977 B
Lua
|
#!/usr/bin/env dnsjit
|
||
|
|
local pcap_in = arg[2]
|
||
|
|
local pcap_out = arg[3]
|
||
|
|
|
||
|
|
if pcap_in == nil or pcap_out == nil then
|
||
|
|
print("usage: "..arg[1].." <pcap in> <pcap out>")
|
||
|
|
return
|
||
|
|
end
|
||
|
|
|
||
|
|
local object = require("dnsjit.core.objects")
|
||
|
|
local input = require("dnsjit.input.pcap").new()
|
||
|
|
local layer = require("dnsjit.filter.layer").new()
|
||
|
|
local dns = require("dnsjit.core.object.dns").new()
|
||
|
|
local output = require("dnsjit.output.pcap").new()
|
||
|
|
|
||
|
|
input:open_offline(pcap_in)
|
||
|
|
layer:producer(input)
|
||
|
|
local producer, ctx = layer:produce()
|
||
|
|
|
||
|
|
output:open(pcap_out, input:linktype(), input:snaplen())
|
||
|
|
local receiver, rctx = output:receive()
|
||
|
|
|
||
|
|
local n = 0
|
||
|
|
while true do
|
||
|
|
local obj = producer(ctx)
|
||
|
|
if obj == nil then break end
|
||
|
|
local pl = obj:cast()
|
||
|
|
if obj:type() == "payload" and pl.len > 0 then
|
||
|
|
dns.obj_prev = obj
|
||
|
|
if dns:parse_header() == 0 then
|
||
|
|
receiver(rctx, obj)
|
||
|
|
n = n + 1
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
output:close()
|
||
|
|
print(n, "DNS packets dumped")
|