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%% Copyright (c) 2015 Peter Morgan <peter.james.morgan@gmail.com> |
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%% |
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%% Licensed under the Apache License, Version 2.0 (the "License"); |
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%% you may not use this file except in compliance with the License. |
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%% You may obtain a copy of the License at |
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%% |
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%% http://www.apache.org/licenses/LICENSE-2.0 |
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%% |
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%% Unless required by applicable law or agreed to in writing, software |
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%% distributed under the License is distributed on an "AS IS" BASIS, |
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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%% See the License for the specific language governing permissions and |
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%% limitations under the License. |
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-module(pcapng). |
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-export([get_env/1]). |
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-export([parse/1]). |
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-export([process/1]). |
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-export([variable_length/2]). |
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-export([variable_length/3]). |
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-define(SECTION_HEADER, 16#0A0D0D0A). |
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-define(BYTE_ORDER_MAGIC, 16#1A2B3C4D). |
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-define(INTERFACE_DESCRIPTION, 1). |
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-define(PACKET, 2). |
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-define(SIMPLE_PACKET, 3). |
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-define(NAME_RESOLUTION, 4). |
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-define(INTERFACE_STATISTICS, 5). |
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-define(ENHANCED_PACKET, 6). |
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process(Filename) -> |
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{ok, PCAPNG} = file:read_file(Filename), |
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write_file(filename:rootname(Filename) ++ ".terms", |
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parse(PCAPNG)). |
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write_file(Filename, Terms) -> |
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{ok, Header} = file:read_file("HEADER.txt"), |
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file:write_file( |
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Filename, |
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[io_lib:fwrite("%% -*- mode: erlang -*-~n", []), |
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Header, |
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[io_lib:fwrite("~n~p.~n", [Term]) || Term <- Terms]]). |
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parse(<< |
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?SECTION_HEADER:32, |
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_:32, |
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?BYTE_ORDER_MAGIC:32/little, |
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_/binary>> = Data) -> |
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parse(Data, conversion(little)); |
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parse(<< |
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?SECTION_HEADER:32, |
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_:32, |
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?BYTE_ORDER_MAGIC:32/big, |
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_/binary>> = Data) -> |
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parse(Data, conversion(big)). |
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parse(Data, I) -> |
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case block(Data, I) of |
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#{block := Block, remainder := <<>>} -> |
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[Block]; |
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#{block := Block, remainder := Remainder} -> |
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[Block | parse(Remainder, I)] |
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end. |
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block(<<Type:32/bits, _/binary>> = Data, I) -> |
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block(I(Type), Data, I). |
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block(Type, Data, I) -> |
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#{body := Body, remainder := Remainder} = body(Type, Data, I), |
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#{block => decode(Type, Body, I), remainder => Remainder}. |
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body(3, <<_:32/bits, TotalLength:32/bits, _/binary>> = Data, I) -> |
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BodyLength = I(TotalLength) - 11, |
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<< |
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_:32/bits, |
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TotalLength:32/bits, |
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Body:BodyLength/bytes, |
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TotalLength:32/bits, |
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Remainder/binary |
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>> = Data, |
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#{body => Body, remainder => Remainder}; |
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body(_, <<_:32/bits, TotalLength:32/bits, _/binary>> = Data, I) -> |
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BodyLength = I(TotalLength) - 12, |
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<< |
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_:32/bits, |
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TotalLength:32/bits, |
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Body:BodyLength/bytes, |
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TotalLength:32/bits, |
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Remainder/binary |
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>> = Data, |
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#{body => Body, remainder => Remainder}. |
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blocks() -> |
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#{ |
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?SECTION_HEADER => pcapng_section_header_block, |
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?INTERFACE_DESCRIPTION => pcapng_interface_description_block, |
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?PACKET => pcapng_packet_block, |
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?SIMPLE_PACKET => pcapng_simple_packet_block, |
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?NAME_RESOLUTION => pcapng_name_resolution_block, |
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?INTERFACE_STATISTICS => pcapng_interface_statistics_block, |
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?ENHANCED_PACKET => pcapng_enhanced_packet_block |
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}. |
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decode(BlockType, BlockBody, I) -> |
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(maps:get(BlockType, blocks())):parse(BlockBody, I). |
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variable_length(Packet, Length) -> |
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variable_length(Packet, Length, 4). |
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variable_length(Packet, Length, Alignment) when Length rem Alignment =:= 0 -> |
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<<Aligned:Length/bytes, Remainder/binary>> = Packet, |
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#{body => Aligned, remainder => Remainder}; |
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variable_length(Packet, Length, Alignment) -> |
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Padding = (Alignment - (Length rem Alignment)) * 8, |
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<<Aligned:Length/bytes, _:Padding, Remainder/binary>> = Packet, |
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#{body => Aligned, remainder => Remainder}. |
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conversion(little) -> |
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fun |
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(Binary) -> |
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Size = bit_size(Binary), |
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<<I:Size/little>> = Binary, |
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I |
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end; |
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conversion(big) -> |
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fun |
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(Binary) -> |
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Size = bit_size(Binary), |
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<<I:Size/big>> = Binary, |
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I |
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end. |
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get_env(Par) -> |
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case application:get_env(?MODULE, Par) of |
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{ok, Val} -> |
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Val; |
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undefined -> |
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#{} |
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end. |