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Moved EIGRP decoding in packetdecoders.lua to use eigrp.lua library.
This commit is contained in:
kroosec
@@ -187,8 +187,8 @@ Decoders = {
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},
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-- EIGRP Query & Update
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['020[13]....00000000'] = {
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-- EIGRP Update
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['0201....0000'] = {
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new = function(self)
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local o = { dups = {} }
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@@ -205,95 +205,44 @@ Decoders = {
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local data = layer3:sub(p.ip_data_offset + 1)
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local eigrp = require("eigrp")
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local route_type, proto_name
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-- Extract the EIGRP header
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local pos, ver, opcode, checksum, flags, seq, ack, asnum = bin.unpack(">CCSiiii", data)
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local response = eigrp.EIGRP.parse(data)
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local route_type, size, nexthop, delay, bandwidth, temp, mtu, orig_router, orig_as, arbtag
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local hop_count, reliability, load, reserved, mask
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local destination
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-- Iterate over the routes
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while ( pos < #data ) do
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-- Get the route type as the packet construction varies
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pos,route_type = bin.unpack(">S", data, pos)
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if ( route_type == 258 ) then
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route_type = 'internal'
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pos, size, nexthop, delay, bandwidth, temp, mtu = bin.unpack(">SiiiCS", data, pos)
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pos, hop_count, reliability, load, reserved, mask = bin.unpack(">CCCSC", data, pos)
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local oct1, oct2, oct3, oct4 = 0, 0, 0, 0
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-- unneeded address octets are left out of the packets, lets fill in the gaps
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if ( size == 29 ) then
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-- mask 25 or above
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pos, oct1, oct2, oct3, oct4 = bin.unpack(">CCCC", data, pos)
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elseif ( size == 28 ) then
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pos, oct1, oct2, oct3 = bin.unpack(">CCC", data, pos)
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elseif ( size == 27 ) then
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pos, oct1, oct2 = bin.unpack(">CC", data, pos)
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elseif ( size == 26 ) then
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pos, oct1 = bin.unpack(">C", data, pos)
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end
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destination = oct1 .. '.' .. oct2 .. '.' .. oct3 .. '.' .. oct4 .. "/" .. mask
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orig_router = 'n/a'
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elseif ( route_type == 259 ) then
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-- external route, from a different routing protocol
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pos, size, nexthop = bin.unpack(">Si", data, pos)
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local orig_rtr_oct1, orig_rtr_oct2, orig_rtr_oct3, orig_rtr_oct4, ext_proto_id, ext_metric
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pos, orig_rtr_oct1, orig_rtr_oct2, orig_rtr_oct3, orig_rtr_oct4 = bin.unpack(">CCCC", data, pos)
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orig_router = orig_rtr_oct1 .. '.' .. orig_rtr_oct2 .. '.' .. orig_rtr_oct3 .. '.' .. orig_rtr_oct4
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pos, orig_as, arbtag, ext_metric = bin.unpack(">iii", data, pos)
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pos, reserved, ext_proto_id, flags, delay, bandwidth = bin.unpack(">SCCii", data, pos)
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pos, temp, mtu, hop_count, reliability, load, reserved, mask = bin.unpack(">CSCCCSC", data, pos)
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local oct1, oct2, oct3, oct4 = 0, 0, 0, 0
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-- unneeded address octets are left out of the packets, lets fill in the gaps
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if ( size == 49 ) then
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-- mask 25 or above
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pos, oct1, oct2, oct3, oct4 = bin.unpack(">CCCC", data, pos)
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elseif ( size == 48 ) then
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pos, oct1, oct2, oct3 = bin.unpack(">CCC", data, pos)
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elseif ( size == 47 ) then
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pos, oct1, oct2 = bin.unpack(">CC", data, pos)
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elseif ( size == 46 ) then
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pos, oct1 = bin.unpack(">C", data, pos)
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end
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destination = oct1 .. '.' .. oct2 .. '.' .. oct3 .. '.' .. oct4 .. "/" .. mask
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local Proto_Types = {
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[1] = 'external (IGRP)',
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[2] = 'external (EIGRP)',
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[3] = 'external (static)',
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[4] = 'external (RIP)',
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[6] = 'external (OSPF)',
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[9] = 'external (RIP)'
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}
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route_type = Proto_Types[ext_proto_id]
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end
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if response then
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-- Iterate over tlv tables
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for _, tlv in pairs(response.tlvs) do
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if eigrp.EIGRP.isRoutingTLV(tlv.type) then
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if ( not(self.results) ) then
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self.results = tab.new(9)
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tab.addrow(self.results, 'sender ip', 'AS#', 'route type', 'destination', 'hop', 'bandwidth', 'delay', 'seq','orig router')
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self.results = tab.new(7)
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tab.addrow(self.results, 'Sender IP', 'AS#', 'Route Type', 'Destination', 'Next hop', 'Ext Protocol', 'Orig Router ID')
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end
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if (delay == -1) then delay = 'unreachable' end
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if ( not(self.dups[("%s:%s:s:%s"):format(p.ip_src,asnum,destination,seq)]) ) then
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if tlv.type == 0x102 then
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route_type = "Internal"
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elseif tlv.type == 0x103 then
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route_type = "External"
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for name, value in pairs(eigrp.EXT_PROTO) do
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if value == tlv.eproto then
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proto_name = name
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break
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end
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end
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end
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if ( not(self.dups[("%s:%s:s:%s"):format(p.ip_src, response.as, tlv.type, tlv.dst)]) ) then
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if ( target.ALLOW_NEW_TARGETS ) then target.add(p.ip_src) end
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self.dups[("%s:%s:%s:%s"):format(p.ip_src,asnum,destination,seq)] = true
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tab.addrow( self.results, p.ip_src, asnum, route_type, destination, hop_count, bandwidth, delay, seq, orig_router )
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self.dups[("%s:%s:%s:%s"):format(p.ip_src, response.as, tlv.type, tlv.dst)] = true
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tab.addrow( self.results, p.ip_src, response.as, route_type, tlv.dst, tlv.nexth, proto_name or 'X', tlv.orouterid or 'X')
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end
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end
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end
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end
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end,
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getResults = function(self) return { name = "EIGRP Query", (self.results and tab.dump(self.results) or "") } end,
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getResults = function(self) return { name = "EIGRP Update", (self.results and tab.dump(self.results) or "") } end,
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},
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['0205....00000000'] = {
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['0205....0000'] = {
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new = function(self)
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local o = { dups = {} }
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@@ -309,33 +258,36 @@ Decoders = {
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if ( p.ip_p ~= 88 ) then return end
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local data = layer3:sub(p.ip_data_offset + 1)
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local eigrp = require("eigrp")
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-- Extract the EIGRP header
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local pos, ver, opcode, checksum, flags, seq, ack, asnum = bin.unpack(">CCSiiii", data)
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-- Skip the parameters for now.
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pos = pos + 10
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local holdtime, software, size, ios_major, ios_minor, eigrp_major, eigrp_minor
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pos, holdtime, software, size, ios_major, ios_minor, eigrp_major, eigrp_minor = bin.unpack(">SSSCCCC", data, pos)
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local response = eigrp.EIGRP.parse(data)
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-- See if Software version TLV is included
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local swvertlv
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for num, tlv in pairs(response.tlvs) do
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if tlv.type == eigrp.TLV.SWVER then
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swvertlv = num
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end
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end
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if swvertlv then
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if ( not(self.results) ) then
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self.results = tab.new(5)
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tab.addrow(self.results, 'sender ip', 'AS number', 'hold time', 'EIGRP version', 'IOS version')
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tab.addrow(self.results, 'Sender IP', 'AS number', 'EIGRP version', 'IOS version')
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end
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if ( not(self.dups[("%s:%s"):format(p.ip_src,asnum)]) ) then
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if ( not(self.dups[("%s:%s"):format(p.ip_src,response.as)]) ) then
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if ( target.ALLOW_NEW_TARGETS ) then target.add(p.ip_src) end
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self.dups[("%s:%s"):format(p.ip_src,asnum)] = true
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tab.addrow( self.results, p.ip_src, asnum, holdtime, eigrp_major .. '.' .. eigrp_minor, ios_major .. '.' .. ios_minor )
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self.dups[("%s:%s"):format(p.ip_src,response.as)] = true
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tab.addrow( self.results, p.ip_src, response.as, response.tlvs[swvertlv].majv .. '.' .. response.tlvs[swvertlv].minv, response.tlvs[swvertlv].majtlv .. '.' .. response.tlvs[swvertlv].mintlv)
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end
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end
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end,
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getResults = function(self) return { name = "EIGRP Hello", (self.results and tab.dump(self.results) or "") } end,
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},
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-- OSPF
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['0201'] = { -- OSPFv2 Hello packet
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['02010'] = { -- OSPFv2 Hello packet
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new = function(self)
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local o = { dups = {} }
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