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|
local datafiles = require "datafiles"
local nmap = require "nmap"
local shortport = require "shortport"
local snmp = require "snmp"
local stdnse = require "stdnse"
local string = require "string"
local table = require "table"
local target = require "target"
description = [[
Attempts to enumerate network interfaces through SNMP.
This script can also be run during Nmap's pre-scanning phase and can
attempt to add the SNMP server's interface addresses to the target
list. The script argument <code>snmp-interfaces.host</code> is
required to know what host to probe. To specify a port for the SNMP
server other than 161, use <code>snmp-interfaces.port</code>. When
run in this way, the script's output tells how many new targets were
successfully added.
]]
---
-- @usage
-- nmap -sU -p 161 --script=snmp-interfaces <target>
-- @args snmp-interfaces.host Specifies the SNMP server to probe when
-- running in the "pre-scanning phase".
-- @args snmp-interfaces.port The optional port number corresponding
-- to the host script argument. Defaults to 161.
--
-- @output
-- | snmp-interfaces:
-- | eth0
-- | IP address: 192.168.221.128
-- | MAC address: 00:0c:29:01:e2:74 (VMware)
-- | Type: ethernetCsmacd Speed: 1 Gbps
-- |_ Traffic stats: 6.45 Mb sent, 15.01 Mb received
--
author = {"Thomas Buchanan", "Kris Katterjohn"}
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"default", "discovery", "safe"}
dependencies = {"snmp-brute"}
-- code borrowed heavily from Patrik Karlsson's excellent snmp scripts
-- Created 03/03/2010 - v0.1 - created by Thomas Buchanan <tbuchanan@thecompassgrp.net>
-- Revised 03/05/2010 - v0.2 - Reworked output slightly, moved iana_types to script scope. Suggested by David Fifield
-- Revised 04/11/2010 - v0.2 - moved snmp_walk to snmp library <patrik@cqure.net>
-- Revised 08/10/2010 - v0.3 - prerule; add interface addresses to Nmap's target list (Kris Katterjohn)
-- Revised 05/27/2011 - v0.4 - action; add MAC addresses to nmap.registry[host.ip]["mac-geolocation"] (Gorjan Petrovski)
-- Revised 07/31/2012 - v0.5 - action; remove mac-geolocation changes (script removed from trunk)
prerule = function()
if not stdnse.get_script_args({"snmp-interfaces.host", "host"}) then
stdnse.debug3("Skipping '%s' %s, 'snmp-interfaces.host' argument is missing.", SCRIPT_NAME, SCRIPT_TYPE)
return false
end
return true
end
portrule = shortport.port_or_service(161, "snmp", "udp", {"open", "open|filtered"})
-- List of IANA-assigned network interface types
-- Taken from IANAifType-MIB
-- Available at http://www.iana.org/assignments/ianaiftype-mib
-- REVISION "201703300000Z" -- March 30, 2017
local iana_types = {
[1] = "other", -- none of the following
[2] = "regular1822",
[3] = "hdh1822",
[4] = "ddnX25",
[5] = "rfc877x25",
[6] = "ethernetCsmacd", -- for all ethernet-like interfaces,
-- regardless of speed, as per RFC3635
[7] = "iso88023Csmacd", -- Deprecated via RFC3635
-- ethernetCsmacd (6) should be used instead
[8] = "iso88024TokenBus",
[9] = "iso88025TokenRing",
[10] = "iso88026Man",
[11] = "starLan", -- Deprecated via RFC3635
-- ethernetCsmacd (6) should be used instead
[12] = "proteon10Mbit",
[13] = "proteon80Mbit",
[14] = "hyperchannel",
[15] = "fddi",
[16] = "lapb",
[17] = "sdlc",
[18] = "ds1", -- DS1-MIB
[19] = "e1", -- Obsolete see DS1-MIB
[20] = "basicISDN", -- no longer used
-- see also RFC2127
[21] = "primaryISDN", -- no longer used
-- see also RFC2127
[22] = "propPointToPointSerial", -- proprietary serial
[23] = "ppp",
[24] = "softwareLoopback",
[25] = "eon", -- CLNP over IP
[26] = "ethernet3Mbit",
[27] = "nsip", -- XNS over IP
[28] = "slip", -- generic SLIP
[29] = "ultra", -- ULTRA technologies
[30] = "ds3", -- DS3-MIB
[31] = "sip", -- SMDS, coffee
[32] = "frameRelay", -- DTE only.
[33] = "rs232",
[34] = "para", -- parallel-port
[35] = "arcnet", -- arcnet
[36] = "arcnetPlus", -- arcnet plus
[37] = "atm", -- ATM cells
[38] = "miox25",
[39] = "sonet", -- SONET or SDH
[40] = "x25ple",
[41] = "iso88022llc",
[42] = "localTalk",
[43] = "smdsDxi",
[44] = "frameRelayService", -- FRNETSERV-MIB
[45] = "v35",
[46] = "hssi",
[47] = "hippi",
[48] = "modem", -- Generic modem
[49] = "aal5", -- AAL5 over ATM
[50] = "sonetPath",
[51] = "sonetVT",
[52] = "smdsIcip", -- SMDS InterCarrier Interface
[53] = "propVirtual", -- proprietary virtual/internal
[54] = "propMultiplexor",-- proprietary multiplexing
[55] = "ieee80212", -- 100BaseVG
[56] = "fibreChannel", -- Fibre Channel
[57] = "hippiInterface", -- HIPPI interfaces
[58] = "frameRelayInterconnect", -- Obsolete, use either
-- frameRelay(32) or
-- frameRelayService(44).
[59] = "aflane8023", -- ATM Emulated LAN for 802.3
[60] = "aflane8025", -- ATM Emulated LAN for 802.5
[61] = "cctEmul", -- ATM Emulated circuit
[62] = "fastEther", -- Obsoleted via RFC3635
-- ethernetCsmacd (6) should be used instead
[63] = "isdn", -- ISDN and X.25
[64] = "v11", -- CCITT V.11/X.21
[65] = "v36", -- CCITT V.36
[66] = "g703at64k", -- CCITT G703 at 64Kbps
[67] = "g703at2mb", -- Obsolete see DS1-MIB
[68] = "qllc", -- SNA QLLC
[69] = "fastEtherFX", -- Obsoleted via RFC3635
-- ethernetCsmacd (6) should be used instead
[70] = "channel", -- channel
[71] = "ieee80211", -- radio spread spectrum
[72] = "ibm370parChan", -- IBM System 360/370 OEMI Channel
[73] = "escon", -- IBM Enterprise Systems Connection
[74] = "dlsw", -- Data Link Switching
[75] = "isdns", -- ISDN S/T interface
[76] = "isdnu", -- ISDN U interface
[77] = "lapd", -- Link Access Protocol D
[78] = "ipSwitch", -- IP Switching Objects
[79] = "rsrb", -- Remote Source Route Bridging
[80] = "atmLogical", -- ATM Logical Port
[81] = "ds0", -- Digital Signal Level 0
[82] = "ds0Bundle", -- group of ds0s on the same ds1
[83] = "bsc", -- Bisynchronous Protocol
[84] = "async", -- Asynchronous Protocol
[85] = "cnr", -- Combat Net Radio
[86] = "iso88025Dtr", -- ISO 802.5r DTR
[87] = "eplrs", -- Ext Pos Loc Report Sys
[88] = "arap", -- Appletalk Remote Access Protocol
[89] = "propCnls", -- Proprietary Connectionless Protocol
[90] = "hostPad", -- CCITT-ITU X.29 PAD Protocol
[91] = "termPad", -- CCITT-ITU X.3 PAD Facility
[92] = "frameRelayMPI", -- Multiproto Interconnect over FR
[93] = "x213", -- CCITT-ITU X213
[94] = "adsl", -- Asymmetric Digital Subscriber Loop
[95] = "radsl", -- Rate-Adapt. Digital Subscriber Loop
[96] = "sdsl", -- Symmetric Digital Subscriber Loop
[97] = "vdsl", -- Very H-Speed Digital Subscrib. Loop
[98] = "iso88025CRFPInt", -- ISO 802.5 CRFP
[99] = "myrinet", -- Myricom Myrinet
[100] = "voiceEM", -- voice recEive and transMit
[101] = "voiceFXO", -- voice Foreign Exchange Office
[102] = "voiceFXS", -- voice Foreign Exchange Station
[103] = "voiceEncap", -- voice encapsulation
[104] = "voiceOverIp", -- voice over IP encapsulation
[105] = "atmDxi", -- ATM DXI
[106] = "atmFuni", -- ATM FUNI
[107] = "atmIma", -- ATM IMA
[108] = "pppMultilinkBundle", -- PPP Multilink Bundle
[109] = "ipOverCdlc", -- IBM ipOverCdlc
[110] = "ipOverClaw", -- IBM Common Link Access to Workstn
[111] = "stackToStack", -- IBM stackToStack
[112] = "virtualIpAddress", -- IBM VIPA
[113] = "mpc", -- IBM multi-protocol channel support
[114] = "ipOverAtm", -- IBM ipOverAtm
[115] = "iso88025Fiber", -- ISO 802.5j Fiber Token Ring
[116] = "tdlc", -- IBM twinaxial data link control
[117] = "gigabitEthernet", -- Obsoleted via RFC3635
-- ethernetCsmacd (6) should be used instead
[118] = "hdlc", -- HDLC
[119] = "lapf", -- LAP F
[120] = "v37", -- V.37
[121] = "x25mlp", -- Multi-Link Protocol
[122] = "x25huntGroup", -- X25 Hunt Group
[123] = "transpHdlc", -- Transp HDLC
[124] = "interleave", -- Interleave channel
[125] = "fast", -- Fast channel
[126] = "ip", -- IP (for APPN HPR in IP networks)
[127] = "docsCableMaclayer", -- CATV Mac Layer
[128] = "docsCableDownstream", -- CATV Downstream interface
[129] = "docsCableUpstream", -- CATV Upstream interface
[130] = "a12MppSwitch", -- Avalon Parallel Processor
[131] = "tunnel", -- Encapsulation interface
[132] = "coffee", -- coffee pot
[133] = "ces", -- Circuit Emulation Service
[134] = "atmSubInterface", -- ATM Sub Interface
[135] = "l2vlan", -- Layer 2 Virtual LAN using 802.1Q
[136] = "l3ipvlan", -- Layer 3 Virtual LAN using IP
[137] = "l3ipxvlan", -- Layer 3 Virtual LAN using IPX
[138] = "digitalPowerline", -- IP over Power Lines
[139] = "mediaMailOverIp", -- Multimedia Mail over IP
[140] = "dtm", -- Dynamic syncronous Transfer Mode
[141] = "dcn", -- Data Communications Network
[142] = "ipForward", -- IP Forwarding Interface
[143] = "msdsl", -- Multi-rate Symmetric DSL
[144] = "ieee1394", -- IEEE1394 High Performance Serial Bus
[145] = "if-gsn", -- HIPPI-6400
[146] = "dvbRccMacLayer", -- DVB-RCC MAC Layer
[147] = "dvbRccDownstream", -- DVB-RCC Downstream Channel
[148] = "dvbRccUpstream", -- DVB-RCC Upstream Channel
[149] = "atmVirtual", -- ATM Virtual Interface
[150] = "mplsTunnel", -- MPLS Tunnel Virtual Interface
[151] = "srp", -- Spatial Reuse Protocol
[152] = "voiceOverAtm", -- Voice Over ATM
[153] = "voiceOverFrameRelay", -- Voice Over Frame Relay
[154] = "idsl", -- Digital Subscriber Loop over ISDN
[155] = "compositeLink", -- Avici Composite Link Interface
[156] = "ss7SigLink", -- SS7 Signaling Link
[157] = "propWirelessP2P", -- Prop. P2P wireless interface
[158] = "frForward", -- Frame Forward Interface
[159] = "rfc1483", -- Multiprotocol over ATM AAL5
[160] = "usb", -- USB Interface
[161] = "ieee8023adLag", -- IEEE 802.3ad Link Aggregate
[162] = "bgppolicyaccounting", -- BGP Policy Accounting
[163] = "frf16MfrBundle", -- FRF .16 Multilink Frame Relay
[164] = "h323Gatekeeper", -- H323 Gatekeeper
[165] = "h323Proxy", -- H323 Voice and Video Proxy
[166] = "mpls", -- MPLS
[167] = "mfSigLink", -- Multi-frequency signaling link
[168] = "hdsl2", -- High Bit-Rate DSL - 2nd generation
[169] = "shdsl", -- Multirate HDSL2
[170] = "ds1FDL", -- Facility Data Link 4Kbps on a DS1
[171] = "pos", -- Packet over SONET/SDH Interface
[172] = "dvbAsiIn", -- DVB-ASI Input
[173] = "dvbAsiOut", -- DVB-ASI Output
[174] = "plc", -- Power Line Communtications
[175] = "nfas", -- Non Facility Associated Signaling
[176] = "tr008", -- TR008
[177] = "gr303RDT", -- Remote Digital Terminal
[178] = "gr303IDT", -- Integrated Digital Terminal
[179] = "isup", -- ISUP
[180] = "propDocsWirelessMaclayer", -- Cisco proprietary Maclayer
[181] = "propDocsWirelessDownstream", -- Cisco proprietary Downstream
[182] = "propDocsWirelessUpstream", -- Cisco proprietary Upstream
[183] = "hiperlan2", -- HIPERLAN Type 2 Radio Interface
[184] = "propBWAp2Mp", -- PropBroadbandWirelessAccesspt2multipt
-- use of this iftype for IEEE 802.16 WMAN
-- interfaces as per IEEE Std 802.16f is
-- deprecated and ifType 237 should be used instead.
[185] = "sonetOverheadChannel", -- SONET Overhead Channel
[186] = "digitalWrapperOverheadChannel", -- Digital Wrapper
[187] = "aal2", -- ATM adaptation layer 2
[188] = "radioMAC", -- MAC layer over radio links
[189] = "atmRadio", -- ATM over radio links
[190] = "imt", -- Inter Machine Trunks
[191] = "mvl", -- Multiple Virtual Lines DSL
[192] = "reachDSL", -- Long Reach DSL
[193] = "frDlciEndPt", -- Frame Relay DLCI End Point
[194] = "atmVciEndPt", -- ATM VCI End Point
[195] = "opticalChannel", -- Optical Channel
[196] = "opticalTransport", -- Optical Transport
[197] = "propAtm", -- Proprietary ATM
[198] = "voiceOverCable", -- Voice Over Cable Interface
[199] = "infiniband", -- Infiniband
[200] = "teLink", -- TE Link
[201] = "q2931", -- Q.2931
[202] = "virtualTg", -- Virtual Trunk Group
[203] = "sipTg", -- SIP Trunk Group
[204] = "sipSig", -- SIP Signaling
[205] = "docsCableUpstreamChannel", -- CATV Upstream Channel
[206] = "econet", -- Acorn Econet
[207] = "pon155", -- FSAN 155Mb Symetrical PON interface
[208] = "pon622", -- FSAN622Mb Symetrical PON interface
[209] = "bridge", -- Transparent bridge interface
[210] = "linegroup", -- Interface common to multiple lines
[211] = "voiceEMFGD", -- voice E&M Feature Group D
[212] = "voiceFGDEANA", -- voice FGD Exchange Access North American
[213] = "voiceDID", -- voice Direct Inward Dialing
[214] = "mpegTransport", -- MPEG transport interface
[215] = "sixToFour", -- 6to4 interface (DEPRECATED)
[216] = "gtp", -- GTP (GPRS Tunneling Protocol)
[217] = "pdnEtherLoop1", -- Paradyne EtherLoop 1
[218] = "pdnEtherLoop2", -- Paradyne EtherLoop 2
[219] = "opticalChannelGroup", -- Optical Channel Group
[220] = "homepna", -- HomePNA ITU-T G.989
[221] = "gfp", -- Generic Framing Procedure (GFP)
[222] = "ciscoISLvlan", -- Layer 2 Virtual LAN using Cisco ISL
[223] = "actelisMetaLOOP", -- Acteleis proprietary MetaLOOP High Speed Link
[224] = "fcipLink", -- FCIP Link
[225] = "rpr", -- Resilient Packet Ring Interface Type
[226] = "qam", -- RF Qam Interface
[227] = "lmp", -- Link Management Protocol
[228] = "cblVectaStar", -- Cambridge Broadband Networks Limited VectaStar
[229] = "docsCableMCmtsDownstream", -- CATV Modular CMTS Downstream Interface
[230] = "adsl2", -- Asymmetric Digital Subscriber Loop Version 2
-- (DEPRECATED/OBSOLETED - please use adsl2plus 238 instead)
[231] = "macSecControlledIF", -- MACSecControlled
[232] = "macSecUncontrolledIF", -- MACSecUncontrolled
[233] = "aviciOpticalEther", -- Avici Optical Ethernet Aggregate
[234] = "atmbond", -- atmbond
[235] = "voiceFGDOS", -- voice FGD Operator Services
[236] = "mocaVersion1", -- MultiMedia over Coax Alliance (MoCA) Interface
-- as documented in information provided privately to IANA
[237] = "ieee80216WMAN", -- IEEE 802.16 WMAN interface
[238] = "adsl2plus", -- Asymmetric Digital Subscriber Loop Version 2,
-- Version 2 Plus and all variants
[239] = "dvbRcsMacLayer", -- DVB-RCS MAC Layer
[240] = "dvbTdm", -- DVB Satellite TDM
[241] = "dvbRcsTdma", -- DVB-RCS TDMA
[242] = "x86Laps", -- LAPS based on ITU-T X.86/Y.1323
[243] = "wwanPP", -- 3GPP WWAN
[244] = "wwanPP2", -- 3GPP2 WWAN
[245] = "voiceEBS", -- voice P-phone EBS physical interface
[246] = "ifPwType", -- Pseudowire interface type
[247] = "ilan", -- Internal LAN on a bridge per IEEE 802.1ap
[248] = "pip", -- Provider Instance Port on a bridge per IEEE 802.1ah PBB
[249] = "aluELP", -- Alcatel-Lucent Ethernet Link Protection
[250] = "gpon", -- Gigabit-capable passive optical networks (G-PON) as per ITU-T G.948
[251] = "vdsl2", -- Very high speed digital subscriber line Version 2 (as per ITU-T Recommendation G.993.2)
[252] = "capwapDot11Profile", -- WLAN Profile Interface
[253] = "capwapDot11Bss", -- WLAN BSS Interface
[254] = "capwapWtpVirtualRadio", -- WTP Virtual Radio Interface
[255] = "bits", -- bitsport
[256] = "docsCableUpstreamRfPort", -- DOCSIS CATV Upstream RF Port
[257] = "cableDownstreamRfPort", -- CATV downstream RF port
[258] = "vmwareVirtualNic", -- VMware Virtual Network Interface
[259] = "ieee802154", -- IEEE 802.15.4 WPAN interface
[260] = "otnOdu", -- OTN Optical Data Unit
[261] = "otnOtu", -- OTN Optical channel Transport Unit
[262] = "ifVfiType", -- VPLS Forwarding Instance Interface Type
[263] = "g9981", -- G.998.1 bonded interface
[264] = "g9982", -- G.998.2 bonded interface
[265] = "g9983", -- G.998.3 bonded interface
[266] = "aluEpon", -- Ethernet Passive Optical Networks (E-PON)
[267] = "aluEponOnu", -- EPON Optical Network Unit
[268] = "aluEponPhysicalUni", -- EPON physical User to Network interface
[269] = "aluEponLogicalLink", -- The emulation of a point-to-point link over the EPON layer
[270] = "aluGponOnu", -- GPON Optical Network Unit
[271] = "aluGponPhysicalUni", -- GPON physical User to Network interface
[272] = "vmwareNicTeam", -- VMware NIC Team
[277] = "docsOfdmDownstream", -- CATV Downstream OFDM interface
[278] = "docsOfdmaUpstream", -- CATV Upstream OFDMA interface
[279] = "gfast", -- G.fast port
[280] = "sdci", -- SDCI (IO-Link)
[281] = "xboxWireless", -- Xbox wireless
[282] = "fastdsl", -- FastDSL
[283] = "docsCableScte55d1FwdOob", -- Cable SCTE 55-1 OOB Forward Channel
[284] = "docsCableScte55d1RetOob", -- Cable SCTE 55-1 OOB Return Channel
[285] = "docsCableScte55d2DsOob", -- Cable SCTE 55-2 OOB Downstream Channel
[286] = "docsCableScte55d2UsOob", -- Cable SCTE 55-2 OOB Upstream Channel
[287] = "docsCableNdf", -- Cable Narrowband Digital Forward
[288] = "docsCableNdr", -- Cable Narrowband Digital Return
[289] = "ptm", -- Packet Transfer Mode
[290] = "ghn" -- G.hn port
}
--- Gets a value for the specified oid
--
-- @param tbl table containing <code>oid</code> and <code>value</code>
-- @param oid string containing the object id for which the value should be extracted
-- @return value of relevant type or nil if oid was not found
function get_value_from_table( tbl, oid )
for _, v in ipairs( tbl ) do
if v.oid == oid then
return v.value
end
end
return nil
end
--- Gets the network interface type from a list of IANA approved types
--
-- @param iana integer interface type returned from snmp result
-- @return string description of interface type, or "Unknown" if type not found
function get_iana_type( iana )
return iana_types[iana] or "Unknown"
end
--- Calculates the speed of the interface based on the snmp value
--
-- @param speed value from IF-MIB::ifSpeed
-- @return string description of speed
function get_if_speed( speed )
local result
-- GigE or 10GigE speeds
if speed >= 1000000000 then
result = string.format( "%.f Gbps", speed / 1000000000)
-- Common for 10 or 100 Mbit ethernet
elseif speed >= 1000000 then
result = string.format( "%.f Mbps", speed / 1000000)
-- Anything slower report in Kbps
else
result = string.format( "%.f Kbps", speed / 1000)
end
return result
end
--- Calculates the amount of traffic passed through an interface based on the snmp value
--
-- @param amount value from IF-MIB::ifInOctets or IF-MIB::ifOutOctets
-- @return string description of traffic amount
function get_traffic( amount )
local result
-- Gigabytes
if amount >= 1000000000 then
result = string.format( "%.2f Gb", amount / 1000000000)
-- Megabytes
elseif amount >= 1000000 then
result = string.format( "%.2f Mb", amount / 1000000)
-- Anything lower report in kb
else
result = string.format( "%.2f Kb", amount / 1000)
end
return result
end
--- Converts a 6 byte string into the familiar MAC address formatting
--
-- @param mac string containing the MAC address
-- @return formatted string suitable for printing
function get_mac_addr( mac )
local catch = function() return end
local try = nmap.new_try(catch)
local mac_prefixes = try(datafiles.parse_mac_prefixes())
if mac:len() ~= 6 then
return "Unknown"
else
local prefix = string.upper(string.format("%02x%02x%02x", mac:byte(1), mac:byte(2), mac:byte(3)))
local manuf = mac_prefixes[prefix] or "Unknown"
return string.format("%s (%s)", stdnse.format_mac(mac:sub(1,6)), manuf )
end
end
--- Processes the list of network interfaces
--
-- @param tbl table containing <code>oid</code> and <code>value</code>
-- @return table with network interfaces described in key / value pairs
function process_interfaces( tbl )
-- Add the %. escape character to prevent matching the index on e.g. "1.3.6.1.2.1.2.2.1.10."
local if_index = "1.3.6.1.2.1.2.2.1.1%."
local if_descr = "1.3.6.1.2.1.2.2.1.2."
local if_type = "1.3.6.1.2.1.2.2.1.3."
local if_speed = "1.3.6.1.2.1.2.2.1.5."
local if_phys_addr = "1.3.6.1.2.1.2.2.1.6."
local if_status = "1.3.6.1.2.1.2.2.1.8."
local if_in_octets = "1.3.6.1.2.1.2.2.1.10."
local if_out_octets = "1.3.6.1.2.1.2.2.1.16."
local new_tbl = {}
-- Some operating systems (such as MS Windows) don't list interfaces with consecutive indexes
-- Therefore we keep an index list so we can iterate over the indexes later on
new_tbl.index_list = {}
for _, v in ipairs( tbl ) do
if ( v.oid:match("^" .. if_index) ) then
local item = {}
item.index = get_value_from_table( tbl, v.oid )
local objid = v.oid:gsub( "^" .. if_index, if_descr)
local value = get_value_from_table( tbl, objid )
if value and value:len() > 0 then
item.descr = value
end
objid = v.oid:gsub( "^" .. if_index, if_type )
value = get_value_from_table( tbl, objid )
if value then
item.type = get_iana_type(value)
end
objid = v.oid:gsub( "^" .. if_index, if_speed )
value = get_value_from_table( tbl, objid )
if value then
item.speed = get_if_speed( value )
end
objid = v.oid:gsub( "^" .. if_index, if_phys_addr )
value = get_value_from_table( tbl, objid )
if value and value:len() > 0 then
item.phys_addr = get_mac_addr( value )
end
objid = v.oid:gsub( "^" .. if_index, if_status )
value = get_value_from_table( tbl, objid )
if value == 1 then
item.status = "up"
elseif value == 2 then
item.status = "down"
end
objid = v.oid:gsub( "^" .. if_index, if_in_octets )
value = get_value_from_table( tbl, objid )
if value then
item.received = get_traffic( value )
end
objid = v.oid:gsub( "^" .. if_index, if_out_octets )
value = get_value_from_table( tbl, objid )
if value then
item.sent = get_traffic( value )
end
new_tbl[item.index] = item
-- Add this interface index to our returned list
table.insert( new_tbl.index_list, item.index )
end
end
return new_tbl
end
--- Processes the list of network interfaces and finds associated IP addresses
--
-- @param if_tbl table containing network interfaces
-- @param ip_tbl table containing <code>oid</code> and <code>value</code> pairs from IP::MIB
-- @return table with network interfaces described in key / value pairs
function process_ips( if_tbl, ip_tbl )
local ip_index = "1.3.6.1.2.1.4.20.1.2."
local ip_addr = "1.3.6.1.2.1.4.20.1.1."
local ip_netmask = "1.3.6.1.2.1.4.20.1.3."
local index
local item
for _, v in ipairs( ip_tbl ) do
if ( v.oid:match("^" .. ip_index) ) then
index = get_value_from_table( ip_tbl, v.oid )
if not index then goto NEXT_PROCESS_IPS end
item = if_tbl[index]
if not item then
stdnse.debug1("Unknown interface index %s", index)
goto NEXT_PROCESS_IPS
end
local objid = v.oid:gsub( "^" .. ip_index, ip_addr )
local value = get_value_from_table( ip_tbl, objid )
if value then
item.ip_addr = value
end
objid = v.oid:gsub( "^" .. ip_index, ip_netmask )
value = get_value_from_table( ip_tbl, objid )
if value then
item.netmask = value
end
::NEXT_PROCESS_IPS::
end
end
return if_tbl
end
--- Creates a table of IP addresses from the table of network interfaces
--
-- @param tbl table containing network interfaces
-- @return table containing only IP addresses
function list_addrs( tbl )
local new_tbl = {}
for _, index in ipairs( tbl.index_list ) do
local interface = tbl[index]
if interface.ip_addr then
table.insert( new_tbl, interface.ip_addr )
end
end
return new_tbl
end
--- Process the table of network interfaces for reporting
--
-- @param tbl table containing network interfaces
-- @return table suitable for <code>stdnse.format_output</code>
function build_results( tbl )
local new_tbl = {}
local verbose = nmap.verbosity()
-- For each interface index previously discovered, format the relevant information for output
for _, index in ipairs( tbl.index_list ) do
local interface = tbl[index]
local item = {}
local status = interface.status
local if_type = interface.type
if interface.descr then
item.name = interface.descr
else
item.name = string.format("Interface %d", index)
end
if interface.ip_addr and interface.netmask then
table.insert( item, ("IP address: %s Netmask: %s"):format( interface.ip_addr, interface.netmask ) )
end
if interface.phys_addr then
table.insert( item, ("MAC address: %s"):format( interface.phys_addr ) )
end
if interface.type and interface.speed then
table.insert( item, ("Type: %s Speed: %s"):format( interface.type, interface.speed ) )
end
if ( verbose > 0 ) and interface.status then
table.insert( item, ("Status: %s"):format( interface.status ) )
end
if interface.sent and interface.received then
table.insert( item, ("Traffic stats: %s sent, %s received"):format( interface.sent, interface.received ) )
end
if ( verbose > 0 ) or status == "up" then
table.insert( new_tbl, item )
end
end
return new_tbl
end
action = function(host, port)
-- IF-MIB - used to look up network interfaces
local if_oid = "1.3.6.1.2.1.2.2.1"
-- IP-MIB - used to determine IP address information
local ip_oid = "1.3.6.1.2.1.4.20"
local interfaces = {}
local ips = {}
local status
local srvhost, srvport
if SCRIPT_TYPE == "prerule" then
srvhost = stdnse.get_script_args({"snmp-interfaces.host", "host"})
if not srvhost then
-- Shouldn't happen; checked in prerule.
return
end
srvport = stdnse.get_script_args({"snmp-interfaces.port", "port"})
if srvport then
srvport = { number=tonumber(srvport), protocol="udp" }
else
srvport = { number=tonumber(srvport), protocol="udp" }
end
else
srvhost = host.ip
srvport = port.number
end
local snmpHelper = snmp.Helper:new(host, port)
snmpHelper:connect()
-- retrieve network interface information from IF-MIB
status, interfaces = snmpHelper:walk(if_oid)
if (not(status)) or ( interfaces == nil ) or ( #interfaces == 0 ) then
return
end
stdnse.debug1("SNMP walk of IF-MIB returned %d lines", #interfaces)
-- build a table of network interfaces from the IF-MIB table
interfaces = process_interfaces( interfaces )
-- retrieve IP address information from IP-MIB
status, ips = snmpHelper:walk( ip_oid )
-- associate that IP address information with the correct interface
if (not(status)) or ( ips ~= nil ) and ( #ips ~= 0 ) then
interfaces = process_ips( interfaces, ips )
end
local output = stdnse.format_output( true, build_results(interfaces) )
if SCRIPT_TYPE == "prerule" and target.ALLOW_NEW_TARGETS then
local sum = 0
ips = list_addrs(interfaces)
-- Could add all of the addresses at once, but count
-- successful additions instead for script output
for _, i in ipairs(ips) do
local st, err = target.add(i)
if st then
sum = sum + 1
else
stdnse.debug1("Couldn't add target " .. i .. ": " .. err)
end
end
if sum ~= 0 then
output = output .. "\nSuccessfully added " .. tostring(sum) .. " new targets"
end
elseif SCRIPT_TYPE == "portrule" then
nmap.set_port_state(host, port, "open")
end
return output
end
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