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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_ip). |
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-export([decode/1]). |
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-define(ICMP, 1). |
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-define(IGMP, 2). |
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-define(TCP, 6). |
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-define(UDP, 17). |
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-define(ENCAP, 41). |
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-define(OSPF, 89). |
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-define(SCTP, 132). |
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decode(<<4:4, IHL:4, _:6, _:2, _TotalLength:16, _/binary>> = Packet) -> |
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Size=IHL*4, |
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<<Header:Size/binary, Data/binary>> = Packet, |
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decode(header(Header), Data); |
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decode(<< |
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6:4, |
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TrafficClass:8, |
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FlowLabel:20, |
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PayloadLength:16, |
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NextHeader:8, |
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HopLimit:8, |
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Source:128, |
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Destination:128, |
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_/binary |
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>>) -> |
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#{traffic_class => TrafficClass, |
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flow_label => FlowLabel, |
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payload_length => PayloadLength, |
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next_header => NextHeader, |
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hop_limit => HopLimit, |
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source => Source, |
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destination => Destination |
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}. |
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header(<< |
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4:4, |
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IHL:4, |
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DSCP:6, |
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ECN:2, |
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TotalLength:16, |
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Identification:16, |
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Flags:3, |
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FragmentOffset:13, |
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TTL:8, |
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Protocol:8, |
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CheckSum:16, |
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S1:8, |
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S2:8, |
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S3:8, |
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S4:8, |
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D1:8, |
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D2:8, |
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D3:8, |
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D4:8>>) -> |
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#{ihl => IHL, |
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dscp => DSCP, |
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ecn => ECN, |
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total_length => TotalLength, |
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identification => Identification, |
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flags => Flags, |
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fragment_offset => FragmentOffset, |
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ttl => TTL, |
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protocol => Protocol, |
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check_sum => CheckSum, |
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source => {S1, S2, S3, S4}, |
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destination => {D1, D2, D3, D4} |
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}. |
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decode(#{protocol := ?UDP} = Header, Packet) -> |
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#{header => Header, udp => pcapng_ip_udp:decode(Packet)}; |
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decode(#{protocol := ?TCP} = Header, Packet) -> |
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#{header => Header, tcp => pcapng_ip_tcp:decode(Packet)}. |