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https://github.com/bol-van/zapret-win-bundle.git
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40 lines
1.4 KiB
Lua
40 lines
1.4 KiB
Lua
function pcap_write_header(file)
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-- big endian, nanoseconds in timestamps, ver 2.4, max packet size - 0x4000 (16384), 0x65 - l3 packets without l2
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file:write("\xA1\xB2\x3C\x4D\x00\x02\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x40\x00\x00\x00\x00\x65")
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end
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function pcap_write_packet(file, raw)
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local sec, nsec = clock_gettime();
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file:write(bu32(sec)..bu32(nsec)..bu32(#raw)..bu32(#raw))
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file:write(raw)
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file:close()
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end
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function pcap_write(file, raw)
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local pos = file:seek()
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if (pos==0) then
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pcap_write_header(file)
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end
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pcap_write_packet(file, raw)
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end
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-- test case : nfqws2 --qnum 200 --debug --lua-init=@zapret-lib.lua --lua-init=@zapret-pcap.lua --writeable=zdir --in-range=a --lua-desync=pcap:file=test.pcap
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-- arg : file=<filename> - file for storing pcap data. if --writeable is specified and filename is relative - append filename to writeable path
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-- arg : keep - do not overwrite file, append packets to existing
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function pcap(ctx, desync)
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if not desync.arg.file or #desync.arg.file==0 then
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error("pcap requires 'file' parameter")
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end
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local fn_cache_name = desync.func_instance.."_fn"
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if not _G[fn_cache_name] then
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_G[fn_cache_name] = writeable_file_name(desync.arg.file)
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if not desync.arg.keep then
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-- overwrite file
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os.remove(_G[fn_cache_name])
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end
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end
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local f = io.open(_G[fn_cache_name], "a")
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if not f then
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error("pcap: could not write to '".._G[fn_cache_name].."'")
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end
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pcap_write(f, raw_packet(ctx))
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end
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