| Current Path : /usr/share/nmap/nselib/ |
| Current File : //usr/share/nmap/nselib/rpc.lua |
---
-- RPC Library supporting a very limited subset of operations.
--
-- The library works over both the UDP and TCP protocols. A subset of nfs and
-- mountd procedures are supported. The nfs and mountd programs support
-- versions 1 through 3. Authentication is supported using the NULL RPC
-- Authentication protocol
--
-- The library contains the following classes:
-- * <code>Comm </code>
-- ** Handles network connections.
-- ** Handles low-level packet sending, recieving, decoding and encoding.
-- ** Stores rpc programs info: socket, protocol, program name, id and version.
-- ** Used by Mount, NFS, RPC and Portmap.
-- * <code>Portmap</code>
-- ** Contains RPC constants.
-- ** Handles communication with the portmap RPC program.
-- * <code>Mount</code>
-- ** Handles communication with the mount RPC program.
-- * <code>NFS</code>
-- ** Handles communication with the nfs RPC program.
-- * <code>Helper</code>
-- ** Provides easy access to common RPC functions.
-- ** Implemented as a static class where most functions accept host and port parameters.
-- * <code>Util</code>
-- ** Mostly static conversion routines.
--
-- The portmapper dynamically allocates TCP/UDP ports to RPC programs. So in
-- in order to request a list of NFS shares from the server we need to:
-- * Make sure that we can talk to the portmapper on port 111 TCP or UDP.
-- * Query the portmapper for the ports allocated to the NFS program.
-- * Query the NFS program for a list of shares on the ports returned by the portmap program.
--
-- The Helper class contains functions that facilitate access to common
-- RPC program procedures through static class methods. Most functions accept
-- host and port parameters. As the Helper functions query the portmapper to
-- get the correct RPC program port, the port supplied to these functions
-- should be the rpcbind port 111/tcp or 111/udp.
--
-- The following sample code illustrates how scripts can use the <code>Helper</code> class
-- to interface the library:
--
-- <code>
-- -- retrieve a list of NFS export
-- status, mounts = rpc.Helper.ShowMounts( host, port )
--
-- -- iterate over every share
-- for _, mount in ipairs( mounts ) do
--
-- -- get the NFS attributes for the share
-- status, attribs = rpc.Helper.GetAttributes( host, port, mount.name )
-- .... process NFS attributes here ....
-- end
-- </code>
--
-- RPC transaction IDs (XID) are not properly implemented as a random ID is
-- generated for each client call. The library makes no attempt to verify
-- whether the returned XID is valid or not.
--
-- Therefore TCP is the preferred method of communication and the library
-- always attempts to connect to the TCP port of the RPC program first.
-- This behaviour can be overrided by setting the rpc.protocol argument.
-- The portmap service is always queried over the protocol specified in the
-- port information used to call the Helper function from the script.
--
-- When multiple versions exists for a specific RPC program the library
-- always attempts to connect using the highest available version.
--
-- @copyright Same as Nmap--See http://nmap.org/book/man-legal.html
--
-- @author "Patrik Karlsson <patrik@cqure.net>"
--
-- @args nfs.version number If set overrides the detected version of nfs
-- @args mount.version number If set overrides the detected version of mountd
-- @args rpc.protocol table If set overrides the preferred order in which
-- protocols are tested. (ie. "tcp", "udp")
module(... or "rpc", package.seeall)
require("datafiles")
-- Version 0.3
--
-- Created 01/24/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
-- Revised 02/22/2010 - v0.2 - cleanup, revised the way TCP/UDP are handled fo
-- encoding an decoding
-- Revised 03/13/2010 - v0.3 - re-worked library to be OO
-- Revised 04/18/2010 - v0.4 - Applied patch from Djalal Harouni with improved
-- error checking and re-designed Comm class. see:
-- http://seclists.org/nmap-dev/2010/q2/232
-- Revised 06/02/2010 - v0.5 - added code to the Util class to check for file
-- types and permissions.
-- Revised 06/04/2010 - v0.6 - combined Portmap and RPC classes in the
-- same Portmap class.
--
-- RPC args using the nmap.registry.args
RPC_args = {
["rpcbind"] = { proto = 'rpc.protocol' },
["nfs"] = { ver = 'nfs.version' },
["mountd"] = { ver = 'mount.version' },
}
-- Defines the order in which to try to connect to the RPC programs
-- TCP appears to be more stable than UDP in most cases, so try it first
local RPC_PROTOCOLS = (nmap.registry.args and nmap.registry.args[RPC_args['rpcbind'].proto] and
type(nmap.registry.args[RPC_args['rpcbind'].proto]) == 'table') and
nmap.registry.args[RPC_args['rpcbind'].proto] or { "tcp", "udp" }
-- used to cache the contents of the rpc datafile
local RPC_PROGRAMS
-- local mutex to synchronize I/O operations on nmap.registry[host.ip]['portmapper']
local mutex = nmap.mutex("rpc")
-- Supported protocol versions
RPC_version = {
["rpcbind"] = { min=2, max=2 },
["nfs"] = { min=1, max=3 },
["mountd"] = { min=1, max=3 },
}
math.randomseed( os.time() )
-- Low-level communication class
Comm = {
--- Creats a new rpc Comm object
--
-- @param program name string
-- @param version number containing the program version to use
-- @return a new Comm object
new = function(self, program, version)
local o = {}
setmetatable(o, self)
self.__index = self
o.program = program
o.program_id = Util.ProgNameToNumber(program)
o:SetVersion(version)
return o
end,
--- Connects to the remote program
--
-- @param host table
-- @param port table
-- @return status boolean true on success, false on failure
-- @return string containing error message (if status is false)
Connect = function(self, host, port)
local status, err, socket
status, err = self:ChkProgram()
if (not(status)) then
return status, err
end
status, err = self:ChkVersion()
if (not(status)) then
return status, err
end
socket = nmap.new_socket()
status, err = socket:connect(host, port)
if (not(status)) then
return status, string.format("%s connect error: %s",
self.program, err)
else
self.socket = socket
self.ip = host.ip
self.port = port.number
self.proto = port.protocol
return status, nil
end
end,
--- Disconnects from the remote program
--
-- @return status boolean true on success, false on failure
-- @return string containing error message (if status is false)
Disconnect = function(self)
local status, err = self.socket:close()
if (not(status)) then
return status, string.format("%s disconnect error: %s",
self.program, err)
end
self.socket=nil
return status, nil
end,
--- Checks if the rpc program is supported
--
-- @return status boolean true on success, false on failure
-- @return string containing error message (if status is false)
ChkProgram = function(self)
if (not(RPC_version[self.program])) then
return false, string.format("RPC library does not support: %s protocol",
self.program)
end
return true, nil
end,
--- Checks if the rpc program version is supported
--
-- @return status boolean true on success, false on failure
-- @return string containing error message (if status is false)
ChkVersion = function(self)
if ( self.version > RPC_version[self.program].max or
self.version < RPC_version[self.program].min ) then
return false, string.format("RPC library does not support: %s version %d",
self.program,self.version)
end
return true, nil
end,
--- Sets the rpc program version
--
-- @return status boolean true
SetVersion = function(self, version)
if (RPC_version[self.program] and RPC_args[self.program] and
nmap.registry.args and nmap.registry.args[RPC_args[self.program].ver]) then
self.version = tonumber(nmap.registry.args[RPC_args[self.program].ver])
elseif (not(self.version) and version) then
self.version = version
end
return true, nil
end,
--- Checks if data contains enough bytes to read the <code>needed</code> amount
-- If it doesn't it attempts to read the remaining amount of bytes from the socket
--
-- @param data string containing the current buffer
-- @param pos number containing the current offset into the buffer
-- @param needed number containing the number of bytes needed to be available
-- @return status success or failure
-- @return data string containing the data passed to the function and the additional data appended to it or error message on failure
GetAdditionalBytes = function( self, data, pos, needed )
local status, tmp
if data:len() - pos + 1 < needed then
local toread = needed - ( data:len() - pos + 1 )
status, tmp = self.socket:receive_bytes( toread )
if status then
data = data .. tmp
else
return false, string.format("getAdditionalBytes() failed to read: %d bytes from the socket",
needed - ( data:len() - pos ) )
end
end
return true, data
end,
--- Creates a RPC header
--
-- @param xid number
-- @param procedure number containing the procedure to call
-- @param auth table containing the authentication data to use
-- @return status boolean true on success, false on failure
-- @return string of bytes on success, error message on failure
CreateHeader = function( self, xid, procedure, auth )
local RPC_VERSION = 2
local packet
if not(xid) then
xid = math.random(1234567890)
end
if not auth then
return false, "Comm.CreateHeader: No authentication specified"
elseif auth.type ~= Portmap.AuthType.NULL then
return false, "Comm.CreateHeader: invalid authentication type specified"
end
packet = bin.pack( ">IIIIII", xid, Portmap.MessageType.CALL, RPC_VERSION,
self.program_id, self.version, procedure )
if auth.type == Portmap.AuthType.NULL then
packet = packet .. bin.pack( "IIII", 0, 0, 0, 0 )
end
return true, packet
end,
--- Decodes the RPC header (without the leading 4 bytes as received over TCP)
--
-- @param data string containing the buffer of bytes read so far
-- @param pos number containing the current offset into data
-- @return pos number containing the offset after the decoding
-- @return header table containing <code>xid</code>, <code>type</code>, <code>state</code>,
-- <code>verifier</code> and ( <code>accept_state</code> or <code>denied_state</code> )
DecodeHeader = function( self, data, pos )
local header = {}
local status
local HEADER_LEN = 20
header.verifier = {}
if ( data:len() - pos < HEADER_LEN ) then
local tmp
status, tmp = self:GetAdditionalBytes( data, pos, HEADER_LEN - ( data:len() - pos ) )
if not status then
stdnse.print_debug(4,
string.format("Comm.ReceivePacket: failed to call GetAdditionalBytes"))
return -1, nil
end
data = data .. tmp
end
pos, header.xid, header.type, header.state = bin.unpack(">III", data, pos)
if ( header.state == Portmap.State.MSG_DENIED ) then
pos, header.denied_state = bin.unpack(">I", data, pos )
return pos, header
end
pos, header.verifier.flavor = bin.unpack(">I", data, pos)
pos, header.verifier.length = bin.unpack(">I", data, pos)
if header.verifier.length - 8 > 0 then
status, data = self:GetAdditionalBytes( data, pos, header.verifier.length - 8 )
if not status then
stdnse.print_debug(4,
string.format("Comm.ReceivePacket: failed to call GetAdditionalBytes"))
return -1, nil
end
pos, header.verifier.data = bin.unpack("A" .. header.verifier.length - 8, data, pos )
end
pos, header.accept_state = bin.unpack(">I", data, pos )
return pos, header
end,
--- Reads the response from the socket
--
-- @return status true on success, false on failure
-- @return data string containing the raw response or error message on failure
ReceivePacket = function( self )
local status
if ( self.proto == "udp" ) then
-- There's not much we can do in here to check if we received all data
-- as the packet contains no length field. It's up to each decoding function
-- to do appropriate checks
return self.socket:receive_bytes(1)
else
local tmp, lastfragment, length
local data, pos = "", 1
repeat
lastfragment = false
status, data = self:GetAdditionalBytes( data, pos, 4 )
if ( not(status) ) then
return false, "Comm.ReceivePacket: failed to call GetAdditionalBytes"
end
pos, tmp = bin.unpack(">i", data, pos )
length = bit.band( tmp, 0x7FFFFFFF )
if ( bit.band( tmp, 0x80000000 ) == 0x80000000 ) then
lastfragment = true
end
status, data = self:GetAdditionalBytes( data, pos, length )
if ( not(status) ) then
return false, "Comm.ReceivePacket: failed to call GetAdditionalBytes"
end
--
-- When multiple packets are received they look like this
-- H = Header data
-- D = Data
--
-- We don't want the Header
--
-- HHHHDDDDDDDDDDDDDDHHHHDDDDDDDDDDD
-- ^ ^ ^ ^
-- 1 5 18 22
--
-- eg. we want
-- data:sub(5, 18) and data:sub(22)
--
local bufcopy = data:sub(pos)
if 1 ~= pos - 4 then
bufcopy = data:sub(1, pos - 5) .. bufcopy
pos = pos - 4
else
pos = 1
end
pos = pos + length
data = bufcopy
until lastfragment == true
return true, data
end
end,
--- Encodes a RPC packet
--
-- @param xid number containing the transaction ID
-- @param proc number containing the procedure to call
-- @param auth table containing authentication information
-- @param data string containing the packet data
-- @return packet string containing the encoded packet data
EncodePacket = function( self, xid, proc, auth, data )
local status, packet = self:CreateHeader( xid, proc, auth )
local len
if ( not(status) ) then
return
end
packet = packet .. ( data or "" )
if ( self.proto == "udp") then
return packet
else
-- set the high bit as this is our last fragment
len = 0x80000000 + packet:len()
return bin.pack(">I", len) .. packet
end
end,
SendPacket = function( self, packet )
return self.socket:send( packet )
end,
}
--- Portmap (rpcbind) class
Portmap =
{
PROTOCOLS = {
['tcp'] = 6,
['udp'] = 17,
},
-- TODO: add more Authentication Protocols
AuthType =
{
NULL = 0
},
-- TODO: complete Authentication stats and error messages
AuthState =
{
AUTH_OK = 0,
AUTH_BADCRED = 1,
AUTH_REJECTEDCRED = 2,
AUTH_BADVERF = 3,
AUTH_REJECTEDVERF = 4,
AUTH_TOOWEAK = 5,
AUTH_INVALIDRESP = 6,
AUTH_FAILED = 7,
},
AuthMsg =
{
[0] = "Success.",
[1] = "bad credential (seal broken).",
[2] = "client must begin new session.",
[3] = "bad verifier (seal broken).",
[4] = "verifier expired or replayed.",
[5] = "rejected for security reasons.",
[6] = "bogus response verifier.",
[7] = "reason unknown.",
},
MessageType =
{
CALL = 0,
REPLY = 1
},
Procedure =
{
[2] =
{
GETPORT = 3,
DUMP = 4,
},
},
State =
{
MSG_ACCEPTED = 0,
MSG_DENIED = 1,
},
AcceptState =
{
SUCCESS = 0,
PROG_UNAVAIL = 1,
PROG_MISMATCH = 2,
PROC_UNAVAIL = 3,
GARBAGE_ARGS = 4,
SYSTEM_ERR = 5,
},
AcceptMsg =
{
[0] = "RPC executed successfully.",
[1] = "remote hasn't exported program.",
[2] = "remote can't support version.",
[3] = "program can't support procedure.",
[4] = "procedure can't decode params.",
[5] = "errors like memory allocation failure.",
},
RejectState =
{
RPC_MISMATCH = 0,
AUTH_ERROR = 1,
},
RejectMsg =
{
[0] = "RPC version number != 2.",
[1] = "remote can't authenticate caller.",
},
new = function(self,o)
o = o or {}
setmetatable(o, self)
self.__index = self
return o
end,
--- Dumps a list of RCP programs from the portmapper
--
-- @param comm object handles rpc program information and
-- low-level packet manipulation
-- @return status boolean true on success, false on failure
-- @return result table containing RPC program information or error message
-- on failure. The table has the following format:
--
-- <code>
-- table[program_id][protocol]["port"] = <port number>
-- table[program_id][protocol]["version"] = <table of versions>
-- </code>
--
-- Where
-- o program_id is the number associated with the program
-- o protocol is either "tcp" or "udp"
--
Dump = function(self, comm)
local status, data, packet, response, pos, header
local program_table = setmetatable({}, { __mode = 'v' })
packet = comm:EncodePacket( nil, Portmap.Procedure[comm.version].DUMP,
{ type=Portmap.AuthType.NULL }, data )
if (not(comm:SendPacket(packet))) then
return false, "Portmap.Dump: Failed to send data"
end
status, data = comm:ReceivePacket()
if ( not(status) ) then
return false, "Portmap.Dump: Failed to read data from socket"
end
pos, header = comm:DecodeHeader( data, 1 )
if ( not(header) ) then
return false, "Portmap.Dump: Failed to decode RPC header"
end
if header.type ~= Portmap.MessageType.REPLY then
return false, "Portmap.Dump: Packet was not a reply"
end
if header.state ~= Portmap.State.MSG_ACCEPTED then
if (Portmap.RejectMsg[header.denied_state]) then
return false,
string.format("Portmap.Dump: RPC call failed: %s",
Portmap.RejectMsg[header.denied_state])
else
return false,
string.format("Portmap.Dump: RPC call failed: code %d",
header.state)
end
end
if header.accept_state ~= Portmap.AcceptState.SUCCESS then
if (Portmap.AcceptMsg[header.accept_state]) then
return false,
string.format("Portmap.Dump: RPC accepted state: %s",
Portmap.AcceptMsg[header.accept_state])
else
return false,
string.format("Portmap.Dump: RPC accepted state code %d",
header.accept_state)
end
end
while true do
local vfollows
local program, version, protocol, port
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if ( not(status) ) then
return false, "Portmap.Dump: Failed to call GetAdditionalBytes"
end
pos, vfollows = bin.unpack( ">I", data, pos )
if ( vfollows == 0 ) then
break
end
pos, program, version, protocol, port = bin.unpack(">IIII", data, pos)
if ( protocol == Portmap.PROTOCOLS.tcp ) then
protocol = "tcp"
elseif ( protocol == Portmap.PROTOCOLS.udp ) then
protocol = "udp"
end
program_table[program] = program_table[program] or {}
program_table[program][protocol] = program_table[program][protocol] or {}
program_table[program][protocol]["port"] = port
program_table[program][protocol]["version"] = program_table[program][protocol]["version"] or {}
table.insert( program_table[program][protocol]["version"], version )
-- parts of the code rely on versions being in order
-- this way the highest version can be chosen by choosing the last element
table.sort( program_table[program][protocol]["version"] )
end
nmap.registry[comm.ip]['portmapper'] = program_table
return true, nmap.registry[comm.ip]['portmapper']
end,
--- Queries the portmapper for the port of the selected program,
-- protocol and version
--
-- @param comm object handles rpc program information and
-- low-level packet manipulation
-- @param program string name of the program
-- @param protocol string containing either "tcp" or "udp"
-- @param version number containing the version of the queried program
-- @return number containing the port number
GetPort = function( self, comm, program, protocol, version )
local status, data, response, header, pos, packet
local xid
if ( not( Portmap.PROTOCOLS[protocol] ) ) then
return false, ("Portmap.GetPort: Protocol %s not supported"):format(protocol)
end
if ( Util.ProgNameToNumber(program) == nil ) then
return false, ("Portmap.GetPort: Unknown program name: %s"):format(program)
end
data = bin.pack(">I>I>I>I", Util.ProgNameToNumber(program), version,
Portmap.PROTOCOLS[protocol], 0 )
packet = comm:EncodePacket(xid, Portmap.Procedure[comm.version].GETPORT,
{ type=Portmap.AuthType.NULL }, data )
if (not(comm:SendPacket(packet))) then
return false, "Portmap.GetPort: Failed to send data"
end
data = ""
status, data = comm:ReceivePacket()
if ( not(status) ) then
return false, "Portmap.GetPort: Failed to read data from socket"
end
pos, header = comm:DecodeHeader( data, 1 )
if ( not(header) ) then
return false, "Portmap.GetPort: Failed to decode RPC header"
end
if header.type ~= Portmap.MessageType.REPLY then
return false, "Portmap.GetPort: Packet was not a reply"
end
if header.state ~= Portmap.State.MSG_ACCEPTED then
if (Portmap.RejectMsg[header.denied_state]) then
return false, string.format("Portmap.GetPort: RPC call failed: %s",
Portmap.RejectMsg[header.denied_state])
else
return false,
string.format("Portmap.GetPort: RPC call failed: code %d",
header.state)
end
end
if header.accept_state ~= Portmap.AcceptState.SUCCESS then
if (Portmap.AcceptMsg[header.accept_state]) then
return false, string.format("Portmap.GetPort: RPC accepted state: %s",
Portmap.AcceptMsg[header.accept_state])
else
return false, string.format("Portmap.GetPort: RPC accepted state code %d",
header.accept_state)
end
end
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if ( not(status) ) then
return false, "Portmap.GetPort: Failed to call GetAdditionalBytes"
end
return true, select(2, bin.unpack(">I", data, pos ) )
end,
}
--- Mount class handling communication with the mountd program
--
-- Currently supports versions 1 through 3
-- Can be called either directly or through the static Helper class
--
Mount = {
StatMsg = {
[1] = "Not owner.",
[2] = "No such file or directory.",
[5] = "I/O error.",
[13] = "Permission denied.",
[20] = "Not a directory.",
[22] = "Invalid argument.",
[63] = "Filename too long.",
[10004] = "Operation not supported.",
[10006] = "A failure on the server.",
},
StatCode = {
MNT_OK = 0,
MNTERR_PERM = 1,
MNTERR_NOENT = 2,
MNTERR_IO = 5,
MNTERR_ACCES = 13,
MNTERR_NOTDIR = 20,
MNTERR_INVAL = 22,
MNTERR_NAMETOOLONG = 63,
MNTERR_NOTSUPP = 10004,
MNTERR_SERVERFAULT = 10006,
},
Procedure =
{
MOUNT = 1,
DUMP = 2,
UMNT = 3,
UMNTALL = 4,
EXPORT = 5,
},
new = function(self,o)
o = o or {}
setmetatable(o, self)
self.__index = self
return o
end,
--- Requests a list of NFS export from the remote server
--
-- @param comm object handles rpc program information and
-- low-level packet manipulation
-- @return status success or failure
-- @return entries table containing a list of share names (strings)
Export = function(self, comm)
local msg_type = 0
local packet
local pos = 1
local header = {}
local entries = {}
local data = ""
local status
if comm.proto ~= "tcp" and comm.proto ~= "udp" then
return false, "Mount.Export: Protocol should be either udp or tcp"
end
packet = comm:EncodePacket(nil, Mount.Procedure.EXPORT,
{ type=Portmap.AuthType.NULL }, nil )
if (not(comm:SendPacket( packet ))) then
return false, "Mount.Export: Failed to send data"
end
status, data = comm:ReceivePacket()
if ( not(status) ) then
return false, "Mount.Export: Failed to read data from socket"
end
-- make sure we have atleast 24 bytes to unpack the header
status, data = comm:GetAdditionalBytes( data, pos, 24 )
if (not(status)) then
return false, "Mount.Export: Failed to call GetAdditionalBytes"
end
pos, header = comm:DecodeHeader( data, pos )
if not header then
return false, "Mount.Export: Failed to decode header"
end
if header.type ~= Portmap.MessageType.REPLY then
return false, "Mount.Export: packet was not a reply"
end
if header.state ~= Portmap.State.MSG_ACCEPTED then
if (Portmap.RejectMsg[header.denied_state]) then
return false, string.format("Mount.Export: RPC call failed: %s",
Portmap.RejectMsg[header.denied_state])
else
return false, string.format("Mount.Export: RPC call failed: code %d",
header.state)
end
end
if header.accept_state ~= Portmap.AcceptState.SUCCESS then
if (Portmap.AcceptMsg[header.accept_state]) then
return false, string.format("Mount.Export: RPC accepted state: %s",
Portmap.AcceptMsg[header.accept_state])
else
return false, string.format("Mount.Export: RPC accepted state code %d",
header.accept_state)
end
end
---
-- Decode directory entries
--
-- [entry]
-- 4 bytes - value follows (1 if more data, 0 if not)
-- [Directory]
-- 4 bytes - value len
-- len bytes - directory name
-- ? bytes - fill bytes (@see calcFillByte)
-- [Groups]
-- 4 bytes - value follows (1 if more data, 0 if not)
-- [Group] (1 or more)
-- 4 bytes - group len
-- len bytes - group value
-- ? bytes - fill bytes (@see calcFillByte)
---
while true do
-- make sure we have atleast 4 more bytes to check for value follows
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
return false, "Mount.Export: Failed to call GetAdditionalBytes"
end
local data_follows
pos, data_follows = Util.unmarshall_uint32(data, pos)
if data_follows ~= 1 then
break
end
--- Export list entry starts here
local entry = {}
local len
-- make sure we have atleast 4 more bytes to get the length
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
return false, "Mount.Export: Failed to call GetAdditionalBytes"
end
pos, len = Util.unmarshall_uint32(data, pos)
status, data = comm:GetAdditionalBytes( data, pos, len )
if (not(status)) then
return false, "Mount.Export: Failed to call GetAdditionalBytes"
end
pos, entry.name = Util.unmarshall_vopaque(len, data, pos)
-- decode groups
while true do
local group
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
return false, "Mount.Export: Failed to call GetAdditionalBytes"
end
pos, data_follows = Util.unmarshall_uint32(data, pos)
if data_follows ~= 1 then
break
end
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
return false, "Mount.Export: Failed to call GetAdditionalBytes"
end
pos, len = Util.unmarshall_uint32(data, pos)
status, data = comm:GetAdditionalBytes( data, pos, len )
if (not(status)) then
return false, "Mount.Export: Failed to call GetAdditionalBytes"
end
pos, group = Util.unmarshall_vopaque(len, data, pos)
table.insert( entry, group )
end
table.insert(entries, entry)
end
return true, entries
end,
--- Attempts to mount a remote export in order to get the filehandle
--
-- @param comm object handles rpc program information and
-- low-level packet manipulation
-- @param path string containing the path to mount
-- @return status success or failure
-- @return fhandle string containing the filehandle of the remote export
Mount = function(self, comm, path)
local packet, mount_status
local _, pos, data, header, fhandle = "", 1, "", "", {}
local status, len
data = Util.marshall_vopaque(path)
packet = comm:EncodePacket( nil, Mount.Procedure.MOUNT, { type=Portmap.AuthType.NULL }, data )
if (not(comm:SendPacket(packet))) then
return false, "Mount: Failed to send data"
end
status, data = comm:ReceivePacket()
if ( not(status) ) then
return false, "Mount: Failed to read data from socket"
end
pos, header = comm:DecodeHeader( data, pos )
if not header then
return false, "Mount: Failed to decode header"
end
if header.type ~= Portmap.MessageType.REPLY then
return false, "Mount: Packet was not a reply"
end
if header.state ~= Portmap.State.MSG_ACCEPTED then
if (Portmap.RejectMsg[header.denied_state]) then
return false, string.format("Mount: RPC call failed: %s",
Portmap.RejectMsg[header.denied_state])
else
return false, string.format("Mount: RPC call failed: code %d",
header.state)
end
end
if header.accept_state ~= Portmap.AcceptState.SUCCESS then
if (Portmap.AcceptMsg[header.accept_state]) then
return false, string.format("Mount (%s): RPC accepted state: %s",
path, Portmap.AcceptMsg[header.accept_state])
else
return false, string.format("Mount (%s): RPC accepted state code %d",
path, header.accept_state)
end
end
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
return false, "Mount: Failed to call GetAdditionalBytes"
end
pos, mount_status = Util.unmarshall_uint32(data, pos)
if (mount_status ~= Mount.StatCode.MNT_OK) then
if (Mount.StatMsg[mount_status]) then
return false, string.format("Mount failed: %s",Mount.StatMsg[mount_status])
else
return false, string.format("Mount failed: code %d", mount_status)
end
end
if ( comm.version == 3 ) then
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
return false, "Mount: Failed to call GetAdditionalBytes"
end
_, len = bin.unpack(">I", data, pos )
status, data = comm:GetAdditionalBytes( data, pos, len + 4 )
if (not(status)) then
return false, "Mount: Failed to call GetAdditionalBytes"
end
pos, fhandle = bin.unpack( "A" .. len + 4, data, pos )
elseif ( comm.version < 3 ) then
status, data = comm:GetAdditionalBytes( data, pos, 32 )
if (not(status)) then
return false, "Mount: Failed to call GetAdditionalBytes"
end
pos, fhandle = bin.unpack( "A32", data, pos )
else
return false, "Mount failed"
end
return true, fhandle
end,
--- Attempts to unmount a remote export in order to get the filehandle
--
-- @param comm object handles rpc program information and
-- low-level packet manipulation
-- @param path string containing the path to mount
-- @return status success or failure
-- @return error string containing error if status is false
Unmount = function(self, comm, path)
local packet, status
local _, pos, data, header, fhandle = "", 1, "", "", {}
data = Util.marshall_vopaque(path)
packet = comm:EncodePacket( nil, Mount.Procedure.UMNT, { type=Portmap.AuthType.NULL }, data )
if (not(comm:SendPacket(packet))) then
return false, "Unmount: Failed to send data"
end
status, data = comm:ReceivePacket( )
if ( not(status) ) then
return false, "Unmount: Failed to read data from socket"
end
pos, header = comm:DecodeHeader( data, pos )
if not header then
return false, "Unmount: Failed to decode header"
end
if header.type ~= Portmap.MessageType.REPLY then
return false, "Unmount: Packet was not a reply"
end
if header.state ~= Portmap.State.MSG_ACCEPTED then
if (Portmap.RejectMsg[header.denied_state]) then
return false, string.format("Unmount: RPC call failed: %s",
Portmap.RejectMsg[header.denied_state])
else
return false, string.format("Unmount: RPC call failed: code %d",
header.state)
end
end
if header.accept_state ~= Portmap.AcceptState.SUCCESS then
if (Portmap.AcceptMsg[header.accept_state]) then
return false, string.format("Unmount (%s): RPC accepted state: %s",
path, Portmap.AcceptMsg[header.accept_state])
else
return false, string.format("Unmount (%s): RPC accepted state code %d",
path, header.accept_state)
end
end
return true, ""
end,
}
--- NFS class handling communication with the nfsd program
--
-- Currently supports versions 1 through 3
-- Can be called either directly or through the static Helper class
--
NFS = {
-- NFS error msg v2 and v3
StatMsg = {
[1] = "Not owner.",
[2] = "No such file or directory.",
[5] = "I/O error.",
[6] = "I/O error. No such device or address.",
[13] = "Permission denied.",
[17] = "File exists.",
[18] = "Attempt to do a cross-device hard link.",
[19] = "No such device.",
[20] = "Not a directory.",
[21] = "Is a directory.",
[22] = "Invalid argument or unsupported argument for an operation.",
[27] = "File too large.",
[28] = "No space left on device.",
[30] = "Read-only file system.",
[31] = "Too many hard links.",
[63] = "The filename in an operation was too long.",
[66] = "An attempt was made to remove a directory that was not empty.",
[69] = "Resource (quota) hard limit exceeded.",
[70] = "Invalid file handle.",
[71] = "Too many levels of remote in path.",
[99] = "The server's write cache used in the \"WRITECACHE\" call got flushed to disk.",
[10001] = "Illegal NFS file handle.",
[10002] = "Update synchronization mismatch was detected during a SETATTR operation.",
[10003] = "READDIR or READDIRPLUS cookie is stale.",
[10004] = "Operation is not supported.",
[10005] = "Buffer or request is too small.",
[10006] = "An error occurred on the server which does not map to any of the legal NFS version 3 protocol error values.",
[10007] = "An attempt was made to create an object of a type not supported by the server.",
[10008] = "The server initiated the request, but was not able to complete it in a timely fashion.",
},
StatCode = {
-- NFS Version 1
[1] = {
NFS_OK = 0,
NFSERR_PERM = 1,
NFSERR_NOENT = 2,
NFSERR_IO = 5,
NFSERR_NXIO = 6,
NFSERR_ACCES = 13,
NFSERR_EXIST = 17,
NFSERR_NODEV = 19,
NFSERR_NOTDIR = 20,
NFSERR_ISDIR = 21,
NFSERR_FBIG = 27,
NFSERR_NOSPC = 28,
NFSERR_ROFS = 30,
NFSERR_NAMETOOLONG = 63,
NFSERR_NOTEMPTY = 66,
NFSERR_DQUOT = 69,
NFSERR_STALE = 70,
NFSERR_WFLUSH = 99,
},
-- NFS Version 2
[2] = {
NFS_OK = 0,
NFSERR_PERM = 1,
NFSERR_NOENT = 2,
NFSERR_IO = 5,
NFSERR_NXIO = 6,
NFSERR_ACCES = 13,
NFSERR_EXIST = 17,
NFSERR_NODEV = 19,
NFSERR_NOTDIR = 20,
NFSERR_ISDIR = 21,
NFSERR_FBIG = 27,
NFSERR_NOSPC = 28,
NFSERR_ROFS = 30,
NFSERR_NAMETOOLONG = 63,
NFSERR_NOTEMPTY = 66,
NFSERR_DQUOT = 69,
NFSERR_STALE = 70,
NFSERR_WFLUSH = 99,
},
-- NFS Version 3
[3] = {
NFS_OK = 0,
NFSERR_PERM = 1,
NFSERR_NOENT = 2,
NFSERR_IO = 5,
NFSERR_NXIO = 6,
NFSERR_ACCES = 13,
NFSERR_EXIST = 17,
NFSERR_XDEV = 18,
NFSERR_NODEV = 19,
NFSERR_NOTDIR = 20,
NFSERR_ISDIR = 21,
NFSERR_INVAL = 22,
NFSERR_FBIG = 27,
NFSERR_NOSPC = 28,
NFSERR_ROFS = 30,
NFSERR_MLINK = 31,
NFSERR_NAMETOOLONG = 63,
NFSERR_NOTEMPTY = 66,
NFSERR_DQUOT = 69,
NFSERR_STALE = 70,
NFSERR_REMOTE = 71,
NFSERR_BADHANDLE = 10001,
NFSERR_NOT_SYNC = 10002,
NFSERR_BAD_COOKIE = 10003,
NFSERR_NOTSUPP = 10004,
NFSERR_TOOSMALL = 10005,
NFSERR_SERVERFAULT = 10006,
NFSERR_BADTYPE = 10007,
NFSERR_JUKEBOX = 10008,
},
},
-- Unfortunately the NFS procedure numbers differ in between versions
Procedure =
{
-- NFS Version 1
[1] =
{
GETATTR = 1,
ROOT = 3,
LOOKUP = 4,
EXPORT = 5,
READDIR = 16,
STATFS = 17,
},
-- NFS Version 2
[2] =
{
GETATTR = 1,
ROOT = 3,
LOOKUP = 4,
EXPORT = 5,
READDIR = 16,
STATFS = 17,
},
-- NFS Version 3
[3] =
{
GETATTR = 1,
SETATTR = 2,
LOOKUP = 3,
ACCESS = 4,
EXPORT = 5,
READDIR = 16,
READDIRPLUS = 17,
FSSTAT = 18,
FSINFO = 19,
PATHCONF = 20,
COMMIT = 21,
},
},
-- ACCESS values used to check the bit mask.
AccessBits =
{
[3] =
{
ACCESS_READ = 0x0001,
ACCESS_LOOKUP = 0x0002,
ACCESS_MODIFY = 0x0004,
ACCESS_EXTEND = 0x0008,
ACCESS_DELETE = 0x0010,
ACCESS_EXECUTE = 0x0020,
},
},
FSinfoBits =
{
[3] =
{
FSF_LINK = 0x0001,
FSF_SYMLINK = 0x0002,
FSF_HOMOGENEOUS = 0x0008,
FSF_CANSETTIME = 0x0010,
},
},
new = function(self,o)
o = o or {}
setmetatable(o, self)
self.__index = self
return o
end,
CheckStat = function (self, procedurename, version, status)
if (status ~= NFS.StatCode[version].NFS_OK) then
if (NFS.StatMsg[status]) then
stdnse.print_debug(4,
string.format("%s failed: %s", procedurename, NFS.StatMsg[status]))
else
stdnse.print_debug(4,
string.format("%s failed: code %d", procedurename, status))
end
return false
end
return true
end,
AccessRead = function (self, mask, version)
return bit.band(mask, NFS.AccessBits[version].ACCESS_READ)
end,
AccessLookup = function (self, mask, version)
return bit.band(mask, NFS.AccessBits[version].ACCESS_LOOKUP)
end,
AccessModify = function (self, mask, version)
return bit.band(mask, NFS.AccessBits[version].ACCESS_MODIFY)
end,
AccessExtend = function (self, mask, version)
return bit.band(mask, NFS.AccessBits[version].ACCESS_EXTEND)
end,
AccessDelete = function (self, mask, version)
return bit.band(mask, NFS.AccessBits[version].ACCESS_DELETE)
end,
AccessExecute = function (self, mask, version)
return bit.band(mask, NFS.AccessBits[version].ACCESS_EXECUTE)
end,
FSinfoLink = function(self, mask, version)
return bit.band(mask, NFS.FSinfoBits[version].FSF_LINK)
end,
FSinfoSymlink = function(self, mask, version)
return bit.band(mask, NFS.FSinfoBits[version].FSF_SYMLINK)
end,
FSinfoHomogeneous = function(self, mask, version)
return bit.band(mask, NFS.FSinfoBits[version].FSF_HOMOGENEOUS)
end,
FSinfoCansettime = function(self, mask, version)
return bit.band(mask, NFS.FSinfoBits[version].FSF_CANSETTIME)
end,
--- Decodes the READDIR section of a NFS ReadDir response
--
-- @param comm object handles rpc program information and
-- low-level packet manipulation
-- @param data string containing the buffer of bytes read so far
-- @param pos number containing the current offset into data
-- @return pos number containing the offset after the decoding
-- @return entries table containing two table entries <code>attributes</code>
-- and <code>entries</code>. The attributes entry is only present when
-- using NFS version 3. The <code>entries</code> field contain one
-- table for each file/directory entry. It has the following fields
-- <code>file_id</code>, <code>name</code> and <code>cookie</code>
--
ReadDirDecode = function( self, comm, data, pos )
local response = {}
local value_follows
local status, _
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
stdnse.print_debug(4, "NFS.ReadDirDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, status = Util.unmarshall_uint32(data, pos)
if (not self:CheckStat("READDIR", comm.version, status)) then
return -1, nil
end
if ( 3 == comm.version ) then
local attrib = {}
response.attributes = {}
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
stdnse.print_debug(4, "NFS.ReadDirDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, value_follows = Util.unmarshall_uint32(data, pos)
if value_follows == 0 then
return -1, nil
end
status, data = comm:GetAdditionalBytes( data, pos, 84 )
if (not(status)) then
stdnse.print_debug(4, "NFS.ReadDirDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, attrib = Util.unmarshall_nfsattr(data, pos, comm.version)
table.insert(response.attributes, attrib)
-- opaque data
status, data = comm:GetAdditionalBytes( data, pos, 8 )
if (not(status)) then
stdnse.print_debug(4, "NFS.ReadDirDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, _ = bin.unpack(">L", data, pos)
end
response.entries = {}
while true do
local entry = {}
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
stdnse.print_debug(4, "NFS.ReadDirDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, value_follows = Util.unmarshall_uint32(data, pos)
if ( value_follows == 0 ) then
break
end
if ( 3 == comm.version ) then
status, data = comm:GetAdditionalBytes( data, pos, 8 )
if (not(status)) then
stdnse.print_debug(4, "NFS.ReadDirDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, entry.fileid = Util.unmarshall_uint64(data, pos )
else
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
stdnse.print_debug(4, "NFS.ReadDirDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, entry.fileid = Util.unmarshall_uint32(data, pos)
end
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
stdnse.print_debug(4, "NFS.ReadDirDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, entry.length = Util.unmarshall_uint32(data, pos)
status, data = comm:GetAdditionalBytes( data, pos, entry.length )
if (not(status)) then
stdnse.print_debug(4, "NFS.ReadDirDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, entry.name = Util.unmarshall_vopaque(entry.length, data, pos)
if ( 3 == comm.version ) then
status, data = comm:GetAdditionalBytes( data, pos, 8 )
if (not(status)) then
stdnse.print_debug(4, "NFS.ReadDirDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, entry.cookie = Util.unmarshall_uint64(data, pos)
else
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
stdnse.print_debug(4, "NFS.ReadDirDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, entry.cookie = Util.unmarshall_uint32(data, pos)
end
table.insert( response.entries, entry )
end
return pos, response
end,
--- Reads the contents inside a NFS directory
--
-- @param comm object handles rpc program information and
-- low-level packet manipulation
-- @param file_handle string containing the filehandle to query
-- @return status true on success, false on failure
-- @return table of file table entries as described in <code>decodeReadDir</code>
ReadDir = function( self, comm, file_handle )
local status, packet
local cookie, count = 0, 8192
local pos, data, _ = 1, "", ""
local header, response = {}, {}
if ( not(file_handle) ) then
return false, "ReadDir: No filehandle received"
end
if ( comm.version == 3 ) then
local opaque_data = 0
data = bin.pack("A>L>L>I", file_handle, cookie, opaque_data, count)
else
data = bin.pack("A>I>I", file_handle, cookie, count)
end
packet = comm:EncodePacket( nil, NFS.Procedure[comm.version].READDIR,
{ type=Portmap.AuthType.NULL }, data )
if(not(comm:SendPacket( packet ))) then
return false, "ReadDir: Failed to send data"
end
status, data = comm:ReceivePacket()
if ( not(status) ) then
return false, "ReadDir: Failed to read data from socket"
end
pos, header = comm:DecodeHeader( data, pos )
if not header then
return false, "ReadDir: Failed to decode header"
end
pos, response = self:ReadDirDecode( comm, data, pos )
if (not(response)) then
return false, "ReadDir: Failed to decode the READDIR section"
end
return true, response
end,
LookUpDecode = function(self, comm, data, pos)
local lookup, status, len, value_follows, _ = {}
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.LookUpDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, status = Util.unmarshall_uint32(data, pos)
if (not self:CheckStat("LOOKUP", comm.version, status)) then
return -1, nil
end
if (comm.version == 3) then
status, data = comm:GetAdditionalBytes( data, pos, 4)
if (not(status)) then
stdnse.print_debug(4, "NFS.LookUpDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
_, len = Util.unmarshall_uint32(data, pos)
status, data = comm:GetAdditionalBytes( data, pos, len + 4)
if (not(status)) then
stdnse.print_debug(4, "NFS.LookUpDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, lookup.fhandle = bin.unpack( "A" .. len + 4, data, pos)
status, data = comm:GetAdditionalBytes( data, pos, 4)
if (not(status)) then
stdnse.print_debug(4, "NFS.LookUpDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
lookup.attributes = {}
pos, value_follows = Util.unmarshall_uint32(data, pos)
if (value_follows ~= 0) then
status, data = comm:GetAdditionalBytes(data, pos, 84)
if (not(status)) then
stdnse.print_debug(4, "NFS.LookUpDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, lookup.attributes = Util.unmarshall_nfsattr(data, pos, comm.version)
else
stdnse.print_debug(4, "NFS.LookUpDecode: File Attributes follow failed")
end
status, data = comm:GetAdditionalBytes( data, pos, 4)
if (not(status)) then
stdnse.print_debug(4, "NFS.LookUpDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
lookup.dir_attributes = {}
pos, value_follows = Util.unmarshall_uint32(data, pos)
if (value_follows ~= 0) then
status, data = comm:GetAdditionalBytes(data, pos, 84)
if (not(status)) then
stdnse.print_debug(4, "NFS.LookUpDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, lookup.dir_attributes = Util.unmarshall_nfsattr(data, pos, comm.version)
else
stdnse.print_debug(4, "NFS.LookUpDecode: File Attributes follow failed")
end
elseif (comm.version < 3) then
status, data = comm:GetAdditionalBytes( data, pos, 32)
if (not(status)) then
stdnse.print_debug(4, "NFS.LookUpDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, lookup.fhandle = bin.unpack("A32", data, pos)
status, data = comm:GetAdditionalBytes( data, pos, 64 )
if (not(status)) then
stdnse.print_debug(4, "NFS.LookUpDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, lookup.attributes = Util.unmarshall_nfsattr(data, pos, comm.version)
else
stdnse.pritn_debug("NFS.LookUpDecode: NFS unsupported version %d", comm.version)
return -1, nil
end
return pos, lookup
end,
LookUp = function(self, comm, dir_handle, file)
local status, packet
local pos, data = 1, ""
local header, response = {}, {}
if (not(dir_handle)) then
return false, "LookUp: No dirhandle received"
end
data = Util.marshall_opaque(dir_handle) .. Util.marshall_vopaque(file)
packet = comm:EncodePacket(nil, NFS.Procedure[comm.version].LOOKUP,
{type=Portmap.AuthType.NULL}, data)
if(not(comm:SendPacket(packet))) then
return false, "LookUp: Failed to send data"
end
status, data = comm:ReceivePacket()
if ( not(status) ) then
return false, "LookUp: Failed to read data from socket"
end
pos, header = comm:DecodeHeader(data, pos)
if not header then
return false, "LookUp: Failed to decode header"
end
pos, response = self:LookUpDecode(comm, data, pos)
if (not(response)) then
return false, "LookUp: Failed to decode the LOOKUP section"
end
return true, response
end,
ReadDirPlusDecode = function(self, comm, data, pos)
local response, status, value_follows, _ = {}
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, status = Util.unmarshall_uint32(data, pos)
if (not self:CheckStat("READDIRPLUS", comm.version, status)) then
return -1, nil
end
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, value_follows = bin.unpack(">I", data, pos)
if value_follows == 0 then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Attributes follow failed")
return -1, nil
end
status, data = comm:GetAdditionalBytes( data, pos, 84 )
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
response.attributes = {}
pos, response.attributes = Util.unmarshall_nfsattr(data, pos, comm.version)
status, data = comm:GetAdditionalBytes(data, pos, 8)
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, _ = bin.unpack(">L", data, pos)
response.entries = {}
while true do
local entry, len = {}
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, value_follows = bin.unpack(">I", data, pos)
if (value_follows == 0) then
break
end
status, data = comm:GetAdditionalBytes(data, pos, 8)
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, entry.fileid = bin.unpack(">L", data, pos)
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, entry.length = bin.unpack(">I", data, pos)
status, data = comm:GetAdditionalBytes( data, pos, entry.length )
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, entry.name = Util.unmarshall_vopaque(entry.length, data, pos)
status, data = comm:GetAdditionalBytes(data, pos, 8)
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, entry.cookie = bin.unpack(">L", data, pos)
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
entry.attributes = {}
pos, value_follows = bin.unpack(">I", data, pos)
if (value_follows ~= 0) then
status, data = comm:GetAdditionalBytes(data, pos, 84)
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, entry.attributes = Util.unmarshall_nfsattr(data, pos, comm.version)
else
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: %s Attributes follow failed",
entry.name)
end
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
entry.fhandle = ""
pos, value_follows = bin.unpack(">I", data, pos)
if (value_follows ~= 0) then
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
_, len = bin.unpack(">I", data, pos)
status, data = comm:GetAdditionalBytes(data, pos, len + 4)
if not status then
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, entry.fhandle = bin.unpack( "A" .. len + 4, data, pos )
else
stdnse.print_debug(4, "NFS.ReadDirPlusDecode: %s handle follow failed",
entry.name)
end
table.insert(response.entries, entry)
end
return pos, response
end,
ReadDirPlus = function(self, comm, file_handle)
local status, packet
local cookie, opaque_data, dircount, maxcount = 0, 0, 512, 8192
local pos, data = 1, ""
local header, response = {}, {}
if (comm.version < 3) then
return false, string.format("NFS version: %d does not support ReadDirPlus",
comm.version)
end
if not file_handle then
return false, "ReadDirPlus: No filehandle received"
end
data = bin.pack("A>L>L>I>I", file_handle, cookie,
opaque_data, dircount, maxcount)
packet = comm:EncodePacket(nil, NFS.Procedure[comm.version].READDIRPLUS,
{type = Portmap.AuthType.NULL }, data)
if (not(comm:SendPacket(packet))) then
return false, "ReadDirPlus: Failed to send data"
end
status, data = comm:ReceivePacket()
if not status then
return false, "ReadDirPlus: Failed to read data from socket"
end
pos, header = comm:DecodeHeader( data, pos )
if not header then
return false, "ReadDirPlus: Failed to decode header"
end
pos, response = self:ReadDirPlusDecode( comm, data, pos )
if not response then
return false, "ReadDirPlus: Failed to decode the READDIR section"
end
return true, response
end,
FsStatDecode = function(self, comm, data, pos)
local fsstat, status, value_follows = {}
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.FsStatDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, status = Util.unmarshall_uint32(data, pos)
if (not self:CheckStat("FSSTAT", comm.version, status)) then
return -1, nil
end
fsstat.attributes = {}
pos, value_follows = Util.unmarshall_uint32(data, pos)
if (value_follows ~= 0) then
status, data = comm:GetAdditionalBytes(data, pos, 84)
if not status then
stdnse.print_debug(4, "NFS.FsStatDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, fsstat.attributes = Util.unmarshall_nfsattr(data, pos, comm.version)
else
stdnse.print_debug(4, "NFS.FsStatDecode: Attributes follow failed")
end
status, data = comm:GetAdditionalBytes( data, pos, 52)
if not status then
stdnse.print_debug(4, "NFS.FsStatDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, fsstat.tbytes, fsstat.fbytes, fsstat.abytes, fsstat.tfiles,
fsstat.ffiles, fsstat.afiles = Util.unmarshall_nfssize3(data, pos, 6)
pos, fsstat.invarsec = Util.unmarshall_uint32(data, pos)
return pos, fsstat
end,
FsStat = function(self, comm, file_handle)
local status, packet
local pos, data = 1, ""
local header, response = {}, {}
if (comm.version < 3) then
return false, string.format("NFS version: %d does not support FSSTAT",
comm.version)
end
if not file_handle then
return false, "FsStat: No filehandle received"
end
data = bin.pack("A", file_handle)
packet = comm:EncodePacket(nil, NFS.Procedure[comm.version].FSSTAT,
{type = Portmap.AuthType.NULL}, data)
if (not(comm:SendPacket(packet))) then
return false, "FsStat: Failed to send data"
end
status, data = comm:ReceivePacket()
if not status then
return false, "FsStat: Failed to read data from socket"
end
pos, header = comm:DecodeHeader(data, pos)
if not header then
return false, "FsStat: Failed to decode header"
end
pos, response = self:FsStatDecode(comm, data, pos)
if not response then
return false, "FsStat: Failed to decode the FSSTAT section"
end
return true, response
end,
FsInfoDecode = function(self, comm, data, pos)
local fsinfo, status, value_follows = {}
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.FsInfoDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, status = Util.unmarshall_uint32(data, pos)
if (not self:CheckStat("FSINFO", comm.version, status)) then
return -1, nil
end
fsinfo.attributes = {}
pos, value_follows = Util.unmarshall_uint32(data, pos)
if (value_follows ~= 0) then
status, data = comm:GetAdditionalBytes(data, pos, 84)
if not status then
stdnse.print_debug(4, "NFS.FsInfoDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, fsinfo.attributes = Util.unmarshall_nfsattr(data, pos, comm.version)
else
stdnse.print_debug(4, "NFS.FsInfoDecode: Attributes follow failed")
end
status, data = comm:GetAdditionalBytes(data, pos, 48)
if not status then
stdnse.print_debug(4, "NFS.FsStatDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, fsinfo.rtmax, fsinfo.rtpref, fsinfo.rtmult,
fsinfo.wtmax, fsinfo.wtpref, fsinfo.wtmult,
fsinfo.dtpref = Util.unmarshall_uint32(data, pos, 7)
pos, fsinfo.maxfilesize = Util.unmarshall_nfssize3(data, pos)
pos, fsinfo.time_delta = Util.unmarshall_nfstime(data, pos)
pos, fsinfo.properties = Util.unmarshall_uint32(data, pos)
return pos, fsinfo
end,
FsInfo = function(self, comm, file_handle)
local status, packet
local pos, data = 1, ""
local header, response = {}
if (comm.version < 3) then
return false, string.format("NFS version: %d does not support FSINFO",
comm.version)
end
if not file_handle then
return false, "FsInfo: No filehandle received"
end
data = Util.marshall_opaque(file_handle)
packet = comm:EncodePacket(nil, NFS.Procedure[comm.version].FSINFO,
{type = Portmap.AuthType.NULL}, data)
if (not(comm:SendPacket(packet))) then
return false, "FsInfo: Failed to send data"
end
status, data = comm:ReceivePacket()
if not status then
return false, "FsInfo: Failed to read data from socket"
end
pos, header = comm:DecodeHeader(data, pos)
if not header then
return false, "FsInfo: Failed to decode header"
end
pos, response = self:FsInfoDecode(comm, data, pos)
if not response then
return false, "FsInfo: Failed to decode the FSINFO section"
end
return true, response
end,
PathConfDecode = function(self, comm, data, pos)
local pconf, status, value_follows = {}
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.PathConfDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, status = Util.unmarshall_uint32(data, pos)
if (not self:CheckStat("PATHCONF", comm.version, status)) then
return -1, nil
end
pconf.attributes = {}
pos, value_follows = Util.unmarshall_uint32(data, pos)
if (value_follows ~= 0) then
status, data = comm:GetAdditionalBytes(data, pos, 84)
if not status then
stdnse.print_debug(4, "NFS.PathConfDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, pconf.attributes = Util.unmarshall_nfsattr(data, pos, comm.version)
else
stdnse.print_debug(4, "NFS.PathConfDecode: Attributes follow failed")
end
status, data = comm:GetAdditionalBytes(data, pos, 24)
if not status then
stdnse.print_debug(4, "NFS.PathConfDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, pconf.linkmax, pconf.name_max, pconf.no_trunc,
pconf.chown_restricted, pconf.case_insensitive,
pconf.case_preserving = Util.unmarshall_uint32(data, pos, 6)
return pos, pconf
end,
PathConf = function(self, comm, file_handle)
local status, packet
local pos, data = 1, ""
local header, response = {}
if (comm.version < 3) then
return false, string.format("NFS version: %d does not support PATHCONF",
comm.version)
end
if not file_handle then
return false, "PathConf: No filehandle received"
end
data = Util.marshall_opaque(file_handle)
packet = comm:EncodePacket(nil, NFS.Procedure[comm.version].PATHCONF,
{type = Portmap.AuthType.NULL}, data)
if (not(comm:SendPacket(packet))) then
return false, "PathConf: Failed to send data"
end
status, data = comm:ReceivePacket()
if not status then
return false, "PathConf: Failed to read data from socket"
end
pos, header = comm:DecodeHeader(data, pos)
if not header then
return false, "PathConf: Failed to decode header"
end
pos, response = self:PathConfDecode(comm, data, pos)
if not response then
return false, "PathConf: Failed to decode the PATHCONF section"
end
return true, response
end,
AccessDecode = function(self, comm, data, pos)
local access, status, value_follows = {}
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.AccessDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, status = Util.unmarshall_uint32(data, pos)
if (not self:CheckStat("ACCESS", comm.version, status)) then
return -1, nil
end
access.attributes = {}
pos, value_follows = Util.unmarshall_uint32(data, pos)
if (value_follows ~= 0) then
status, data = comm:GetAdditionalBytes(data, pos, 84)
if not status then
stdnse.print_debug(4, "NFS.AccessDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, access.attributes = Util.unmarshall_nfsattr(data, pos, comm.version)
else
stdnse.print_debug(4, "NFS.AccessDecode: Attributes follow failed")
end
status, data = comm:GetAdditionalBytes(data, pos, 4)
if not status then
stdnse.print_debug(4, "NFS.AccessDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, access.mask = Util.unmarshall_uint32(data, pos)
return pos, access
end,
Access = function(self, comm, file_handle, access)
local status, packet
local pos, data = 1, ""
local header, response = {}, {}
if (comm.version < 3) then
return false, string.format("NFS version: %d does not support ACCESS",
comm.version)
end
if not file_handle then
return false, "Access: No filehandle received"
end
data = Util.marshall_opaque(file_handle) .. Util.marshall_uint32(access)
packet = comm:EncodePacket(nil, NFS.Procedure[comm.version].ACCESS,
{type = Portmap.AuthType.NULL}, data)
if (not(comm:SendPacket(packet))) then
return false, "Access: Failed to send data"
end
status, data = comm:ReceivePacket()
if not status then
return false, "Access: Failed to read data from socket"
end
pos, header = comm:DecodeHeader(data, pos)
if not header then
return false, "Access: Failed to decode header"
end
pos, response = self:AccessDecode(comm, data, pos)
if not response then
return false, "Access: Failed to decode the FSSTAT section"
end
return true, response
end,
--- Gets filesystem stats (Total Blocks, Free Blocks and Available block) on a remote NFS share
--
-- @param comm object handles rpc program information and
-- low-level packet manipulation
-- @param file_handle string containing the filehandle to query
-- @return status true on success, false on failure
-- @return statfs table with the fields <code>transfer_size</code>, <code>block_size</code>,
-- <code>total_blocks</code>, <code>free_blocks</code> and <code>available_blocks</code>
-- @return errormsg if status is false
StatFs = function( self, comm, file_handle )
local status, packet
local pos, data, _ = 1, "", ""
local header, statfs = {}, {}
if ( comm.version > 2 ) then
return false, ("StatFs: Version %d not supported"):format(comm.version)
end
if ( not(file_handle) or file_handle:len() ~= 32 ) then
return false, "StatFs: Incorrect filehandle received"
end
data = Util.marshall_opaque(file_handle)
packet = comm:EncodePacket( nil, NFS.Procedure[comm.version].STATFS, { type=Portmap.AuthType.NULL }, data )
if (not(comm:SendPacket( packet ))) then
return false, "StatFS: Failed to send data"
end
status, data = comm:ReceivePacket( )
if ( not(status) ) then
return false, "StatFs: Failed to read data from socket"
end
pos, header = comm:DecodeHeader( data, pos )
if not header then
return false, "StatFs: Failed to decode header"
end
pos, statfs = self:StatFsDecode( comm, data, pos )
if not statfs then
return false, "StatFs: Failed to decode statfs structure"
end
return true, statfs
end,
--- Attempts to decode the attributes section of the reply
--
-- @param comm object handles rpc program information and
-- low-level packet manipulation
-- @param data string containing the full statfs reply
-- @param pos number pointing to the statfs section of the reply
-- @return pos number containing the offset after decoding
-- @return statfs table with the following fields: <code>type</code>, <code>mode</code>,
-- <code>nlink</code>, <code>uid</code>, <code>gid</code>, <code>size</code>,
-- <code>blocksize</code>, <code>rdev</code>, <code>blocks</code>, <code>fsid</code>,
-- <code>fileid</code>, <code>atime</code>, <code>mtime</code> and <code>ctime</code>
--
GetAttrDecode = function( self, comm, data, pos )
local status
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
stdnse.print_debug(4, "GetAttrDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, status = Util.unmarshall_uint32(data, pos)
if (not self:CheckStat("GETATTR", comm.version, status)) then
return -1, nil
end
if ( comm.version < 3 ) then
status, data = comm:GetAdditionalBytes( data, pos, 64 )
elseif (comm.version == 3) then
status, data = comm:GetAdditionalBytes( data, pos, 84 )
else
stdnse.print_debug(4, "GetAttrDecode: Unsupported version")
return -1, nil
end
if ( not(status) ) then
stdnse.print_debug(4, "GetAttrDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
return Util.unmarshall_nfsattr(data, pos, comm.version)
end,
--- Gets mount attributes (uid, gid, mode, etc ..) from a remote NFS share
--
-- @param comm object handles rpc program information and
-- low-level packet manipulation
-- @param file_handle string containing the filehandle to query
-- @return status true on success, false on failure
-- @return attribs table with the fields <code>type</code>, <code>mode</code>,
-- <code>nlink</code>, <code>uid</code>, <code>gid</code>, <code>size</code>,
-- <code>blocksize</code>, <code>rdev</code>, <code>blocks</code>, <code>fsid</code>,
-- <code>fileid</code>, <code>atime</code>, <code>mtime</code> and <code>ctime</code>
-- @return errormsg if status is false
GetAttr = function( self, comm, file_handle )
local data, packet, status, attribs, pos, header
data = Util.marshall_opaque(file_handle)
packet = comm:EncodePacket( nil, NFS.Procedure[comm.version].GETATTR, { type=Portmap.AuthType.NULL }, data )
if(not(comm:SendPacket(packet))) then
return false, "GetAttr: Failed to send data"
end
status, data = comm:ReceivePacket()
if ( not(status) ) then
return false, "GetAttr: Failed to read data from socket"
end
pos, header = comm:DecodeHeader( data, 1 )
if not header then
return false, "GetAttr: Failed to decode header"
end
pos, attribs = self:GetAttrDecode(comm, data, pos )
if not attribs then
return false, "GetAttr: Failed to decode attrib structure"
end
return true, attribs
end,
--- Attempts to decode the StatFS section of the reply
--
-- @param comm object handles rpc program information and
-- low-level packet manipulation
-- @param data string containing the full statfs reply
-- @param pos number pointing to the statfs section of the reply
-- @return pos number containing the offset after decoding
-- @return statfs table with the following fields: <code>transfer_size</code>, <code>block_size</code>,
-- <code>total_blocks</code>, <code>free_blocks</code> and <code>available_blocks</code>
StatFsDecode = function( self, comm, data, pos )
local status
local statfs = {}
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if (not(status)) then
stdnse.print_debug(4, "StatFsDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, status = Util.unmarshall_uint32(data, pos)
if (not self:CheckStat("STATFS", comm.version, status)) then
return -1, nil
end
status, data = comm:GetAdditionalBytes( data, pos, 20 )
if (not(status)) then
stdnse.print_debug(4, "StatFsDecode: Failed to call GetAdditionalBytes")
return -1, nil
end
pos, statfs.transfer_size, statfs.block_size,
statfs.total_blocks, statfs.free_blocks,
statfs.available_blocks = Util.unmarshall_uint32(data, pos, 5)
return pos, statfs
end,
}
Helper = {
--- Lists the NFS exports on the remote host
-- This function abstracts the RPC communication with the portmapper from the user
--
-- @param host table
-- @param port table
-- @return status true on success, false on failure
-- @return result table of string entries or error message on failure
ShowMounts = function( host, port )
local status, result, mounts
local mountd, mnt_comm
local mnt = Mount:new()
local portmap = Portmap:new()
status, mountd = Helper.GetProgramInfo( host, port, "mountd")
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.ShowMounts: GetProgramInfo failed")
return status, "rpc.Helper.ShowMounts: GetProgramInfo failed"
end
mnt_comm = Comm:new('mountd', mountd.version)
status, result = mnt_comm:Connect(host, mountd.port)
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.ShowMounts: %s", result)
return false, result
end
status, mounts = mnt:Export(mnt_comm)
mnt_comm:Disconnect()
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.ShowMounts: %s", mounts)
end
return status, mounts
end,
--- Mounts a remote NFS export and returns the file handle
--
-- This is a high level function to be used by NSE scripts
-- To close the mounted NFS export use UnmountPath() function
--
-- @param host table
-- @param port table
-- @param path string containing the path to mount
-- @return on success a Comm object which can be
-- used later as a parameter by low level Mount
-- functions, on failure returns nil.
-- @return on success the filehandle of the NFS export as
-- a string, on failure returns the error message.
MountPath = function(host, port, path)
local fhandle, status, err
local mountd, mnt_comm
local mnt = Mount:new()
status, mountd = Helper.GetProgramInfo( host, port, "mountd")
if not status then
stdnse.print_debug(4, "rpc.Helper.MountPath: GetProgramInfo failed")
return nil, "rpc.Helper.MountPath: GetProgramInfo failed"
end
mnt_comm = Comm:new("mountd", mountd.version)
status, err = mnt_comm:Connect(host, mountd.port)
if not status then
stdnse.print_debug(4, "rpc.Helper.MountPath: %s", err)
return nil, err
end
status, fhandle = mnt:Mount(mnt_comm, path)
if not status then
mnt_comm:Disconnect()
stdnse.print_debug(4, "rpc.Helper.MountPath: %s", fhandle)
return nil, fhandle
end
return mnt_comm, fhandle
end,
--- Unmounts a remote mounted NFS export
--
-- This is a high level function to be used by NSE scripts
-- This function must be used to unmount a NFS point
-- mounted by MountPath()
--
-- @param mnt_comm object returned from a previous call to
-- MountPath()
-- @param path string containing the path to unmount
-- @return true on success or nil on failure
-- @return error message on failure
UnmountPath = function(mnt_comm, path)
local mnt = Mount:new()
local status, ret = mnt:Unmount(mnt_comm, path)
mnt_comm:Disconnect()
if not status then
stdnse.print_debug(4, "rpc.Helper.UnmountPath: %s", ret)
return nil, ret
end
return status, nil
end,
--- Connects to a remote NFS server
--
-- This is a high level function to open NFS connections
-- To close the NFS connection use NfsClose() function
--
-- @param host table
-- @param port table
-- @return on success a Comm object which can be
-- used later as a parameter by low level NFS
-- functions, on failure returns nil.
-- @return error message on failure.
NfsOpen = function(host, port)
local nfs_comm, nfsd, status, err
status, nfsd = Helper.GetProgramInfo(host, port, "nfs")
if not status then
stdnse.print_debug(4, "rpc.Helper.NfsOpen: GetProgramInfo failed")
return nil, "rpc.Helper.NfsOpen: GetProgramInfo failed"
end
nfs_comm = Comm:new('nfs', nfsd.version)
status, err = nfs_comm:Connect(host, nfsd.port)
if not status then
stdnse.print_debug(4, "rpc.Helper.NfsProc: %s", err)
return nil, err
end
return nfs_comm, nil
end,
--- Closes the NFS connection
--
-- This is a high level function to close NFS connections
-- This function must be used to close the NFS connection
-- opened by the NfsOpen() call
--
-- @param nfs_comm object returned by NfsOpen()
-- @return true on success or nil on failure
-- @return error message on failure
NfsClose = function(nfs_comm)
local status, ret = nfs_comm:Disconnect()
if not status then
stdnse.print_debug(4, "rpc.Helper.NfsClose: %s", ret)
return nil, ret
end
return status, nil
end,
--- Retrieves NFS storage statistics
--
-- @param host table
-- @param port table
-- @param path string containing the nfs export path
-- @return status true on success, false on failure
-- @return statfs table with the fields <code>transfer_size</code>, <code>block_size</code>,
-- <code>total_blocks</code>, <code>free_blocks</code> and <code>available_blocks</code>
ExportStats = function( host, port, path )
local fhandle
local stats, status, result
local mnt_comm, nfs_comm
local mountd, nfsd = {}, {}
local mnt, nfs = Mount:new(), NFS:new()
status, mountd = Helper.GetProgramInfo( host, port, "mountd", 2)
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.ExportStats: GetProgramInfo failed")
return status, "rpc.Helper.ExportStats: GetProgramInfo failed"
end
status, nfsd = Helper.GetProgramInfo( host, port, "nfs", 2)
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.ExportStats: GetProgramInfo failed")
return status, "rpc.Helper.ExportStats: GetProgramInfo failed"
end
mnt_comm = Comm:new('mountd', mountd.version)
nfs_comm = Comm:new('nfs', nfsd.version)
-- TODO: recheck the version mismatch when adding NFSv4
if (nfs_comm.version <= 2 and mnt_comm.version > 2) then
stdnse.print_debug(4,"rpc.Helper.ExportStats: versions mismatch, nfs v%d - mount v%d",
nfs_comm.version, mnt_comm.version)
return false, string.format("versions mismatch, nfs v%d - mount v%d",
nfs_comm.version, mnt_comm.version)
end
status, result = mnt_comm:Connect(host, mountd.port)
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.ExportStats: %s", result)
return status, result
end
status, result = nfs_comm:Connect(host, nfsd.port)
if ( not(status) ) then
mnt_comm:Disconnect()
stdnse.print_debug(4, "rpc.Helper.ExportStats: %s", result)
return status, result
end
status, fhandle = mnt:Mount(mnt_comm, path)
if ( not(status) ) then
mnt_comm:Disconnect()
nfs_comm:Disconnect()
stdnse.print_debug(4, "rpc.Helper.ExportStats: %s", fhandle)
return status, fhandle
end
status, stats = nfs:StatFs(nfs_comm, fhandle)
if ( not(status) ) then
mnt_comm:Disconnect()
nfs_comm:Disconnect()
stdnse.print_debug(4, "rpc.Helper.ExportStats: %s", stats)
return status, stats
end
status, fhandle = mnt:Unmount(mnt_comm, path)
mnt_comm:Disconnect()
nfs_comm:Disconnect()
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.ExportStats: %s", fhandle)
return status, fhandle
end
return true, stats
end,
--- Retrieves a list of files from the NFS export
--
-- @param host table
-- @param port table
-- @param path string containing the nfs export path
-- @return status true on success, false on failure
-- @return table of file table entries as described in <code>decodeReadDir</code>
Dir = function( host, port, path )
local fhandle
local dirs, status, result
local mountd, nfsd = {}, {}
local mnt_comm, nfs_comm
local mnt, nfs = Mount:new(), NFS:new()
status, mountd = Helper.GetProgramInfo( host, port, "mountd")
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.Dir: GetProgramInfo failed")
return status, "rpc.Helper.Dir: GetProgramInfo failed"
end
status, nfsd = Helper.GetProgramInfo( host, port, "nfs")
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.Dir: GetProgramInfo failed")
return status, "rpc.Helper.Dir: GetProgramInfo failed"
end
mnt_comm = Comm:new('mountd', mountd.version)
nfs_comm = Comm:new('nfs', nfsd.version)
-- TODO: recheck the version mismatch when adding NFSv4
if (nfs_comm.version <= 2 and mnt_comm.version > 2) then
stdnse.print_debug(4, "rpc.Helper.Dir: versions mismatch, nfs v%d - mount v%d",
nfs_comm.version, mnt_comm.version)
return false, string.format("versions mismatch, nfs v%d - mount v%d",
nfs_comm.version, mnt_comm.version)
end
status, result = mnt_comm:Connect(host, mountd.port)
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.Dir: %s", result)
return status, result
end
status, result = nfs_comm:Connect(host, nfsd.port)
if ( not(status) ) then
mnt_comm:Disconnect()
stdnse.print_debug(4, "rpc.Helper.Dir: %s", result)
return status, result
end
status, fhandle = mnt:Mount(mnt_comm, path )
if ( not(status) ) then
mnt_comm:Disconnect()
nfs_comm:Disconnect()
stdnse.print_debug(4, "rpc.Helper.Dir: %s", fhandle)
return status, fhandle
end
status, dirs = nfs:ReadDir(nfs_comm, fhandle )
if ( not(status) ) then
mnt_comm:Disconnect()
nfs_comm:Disconnect()
stdnse.print_debug(4, "rpc.Helper.Dir: %s", dirs)
return status, dirs
end
status, fhandle = mnt:Unmount(mnt_comm, path)
mnt_comm:Disconnect()
nfs_comm:Disconnect()
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.Dir: %s", fhandle)
return status, fhandle
end
return true, dirs
end,
--- Retrieves NFS Attributes
--
-- @param host table
-- @param port table
-- @param path string containing the nfs export path
-- @return status true on success, false on failure
-- @return statfs table with the fields <code>transfer_size</code>, <code>block_size</code>,
-- <code>total_blocks</code>, <code>free_blocks</code> and <code>available_blocks</code>
GetAttributes = function( host, port, path )
local fhandle
local attribs, status, result
local mnt_comm, nfs_comm
local mountd, nfsd = {}, {}
local mnt, nfs = Mount:new(), NFS:new()
status, mountd = Helper.GetProgramInfo( host, port, "mountd")
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.GetAttributes: GetProgramInfo failed")
return status, "rpc.Helper.GetAttributes: GetProgramInfo failed"
end
status, nfsd = Helper.GetProgramInfo( host, port, "nfs")
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.GetAttributes: GetProgramInfo failed")
return status, "rpc.Helper.GetAttributes: GetProgramInfo failed"
end
mnt_comm, result = Comm:new('mountd', mountd.version)
nfs_comm, result = Comm:new('nfs', nfsd.version)
-- TODO: recheck the version mismatch when adding NFSv4
if (nfs_comm.version <= 2 and mnt_comm.version > 2) then
stdnse.print_debug(4, "rpc.Helper.GetAttributes: versions mismatch, nfs v%d - mount v%d",
nfs_comm.version, mnt_comm.version)
return false, string.format("versions mismatch, nfs v%d - mount v%d",
nfs_comm.version, mnt_comm.version)
end
status, result = mnt_comm:Connect(host, mountd.port)
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.GetAttributes: %s", result)
return status, result
end
status, result = nfs_comm:Connect(host, nfsd.port)
if ( not(status) ) then
mnt_comm:Disconnect()
stdnse.print_debug(4, "rpc.Helper.GetAttributes: %s", result)
return status, result
end
status, fhandle = mnt:Mount(mnt_comm, path)
if ( not(status) ) then
mnt_comm:Disconnect()
nfs_comm:Disconnect()
stdnse.print_debug(4, "rpc.Helper.GetAttributes: %s", fhandle)
return status, fhandle
end
status, attribs = nfs:GetAttr(nfs_comm, fhandle)
if ( not(status) ) then
mnt_comm:Disconnect()
nfs_comm:Disconnect()
stdnse.print_debug(4, "rpc.Helper.GetAttributes: %s", attribs)
return status, attribs
end
status, fhandle = mnt:Unmount(mnt_comm, path)
mnt_comm:Disconnect()
nfs_comm:Disconnect()
if ( not(status) ) then
stdnse.print_debug(4, "rpc.Helper.GetAttributes: %s", fhandle)
return status, fhandle
end
return true, attribs
end,
--- Queries the portmapper for a list of programs
--
-- @param host table
-- @param port table
-- @return status true on success, false on failure
-- @return table containing the portmapper information as returned by
-- <code>Portmap.Dump</code>
RpcInfo = function( host, port )
local status, result
local portmap = Portmap:new()
local comm = Comm:new('rpcbind', 2)
mutex "lock"
if nmap.registry[host.ip] == nil then
nmap.registry[host.ip] = {}
end
if nmap.registry[host.ip]['portmapper'] == nil then
nmap.registry[host.ip]['portmapper'] = {}
elseif next(nmap.registry[host.ip]['portmapper']) ~= nil then
mutex "done"
return true, nmap.registry[host.ip]['portmapper']
end
status, result = comm:Connect(host, port)
if (not(status)) then
mutex "done"
stdnse.print_debug(4, "rpc.Helper.RpcInfo: %s", result)
return status, result
end
status, result = portmap:Dump(comm)
comm:Disconnect()
mutex "done"
if (not(status)) then
stdnse.print_debug(4, "rpc.Helper.RpcInfo: %s", result)
end
return status, result
end,
--- Queries the portmapper for a port for the specified RPC program
--
-- @param host table
-- @param port table
-- @param program_id number containing the RPC program ID
-- @param protocol string containing either "tcp" or "udp"
-- @return status true on success, false on failure
-- @return table containing the portmapper information as returned by
-- <code>Portmap.Dump</code>
GetPortForProgram = function( host, port, program_id, protocol )
local status, result
local portmap = Portmap:new()
local comm = Comm:new('rpcbind', 2)
status, result = comm:Connect(host, port)
if (not(status)) then
stdnse.print_debug(4, "rpc.Helper.GetPortForProgram: %s", result)
return status, result
end
status, result = portmap:GetPort(comm, program_id, protocol, 1 )
comm:Disconnect()
if (not(status)) then
stdnse.print_debug(4, "rpc.Helper.GetPortForProgram: %s", result)
end
return status, result
end,
--- Get RPC program information
--
-- @param host table
-- @param port table
-- @param program string containing the RPC program name
-- @param max_version (optional) number containing highest version to retrieve
-- @return status true on success, false on failure
-- @return info table containing <code>port</code>, <code>port.number</code>
-- <code>port.protocol</code> and <code>version</code>
GetProgramInfo = function( host, port, program, max_version )
local status, portmap_table = Helper.RpcInfo(host, port)
if ( not(status) ) then
return status, portmap_table
end
local info = {}
-- assume failure
status = false
for _, p in ipairs( RPC_PROTOCOLS ) do
local tmp = portmap_table[Util.ProgNameToNumber(program)]
if ( tmp and tmp[p] ) then
info = {}
info.port = {}
info.port.number = tmp[p].port
info.port.protocol = p
-- choose the highest version available
if ( not(RPC_version[program]) ) then
info.version = tmp[p].version[#tmp[p].version]
status = true
else
for i=#tmp[p].version, 1, -1 do
if ( RPC_version[program].max >= tmp[p].version[i] ) then
if ( not(max_version) ) then
info.version = tmp[p].version[i]
status = true
break
else
if ( max_version >= tmp[p].version[i] ) then
info.version = tmp[p].version[i]
status = true
break
end
end
end
end
end
break
end
end
return status, info
end,
}
--- Static class containing mostly conversion functions
-- and File type codes and permissions emulation
Util =
{
-- Symbolic letters for file permission codes
Fperm =
{
owner =
{
-- S_IRUSR
[0x00000100] = { idx = 1, char = "r" },
-- S_IWUSR
[0x00000080] = { idx = 2, char = "w" },
-- S_IXUSR
[0x00000040] = { idx = 3, char = "x" },
-- S_ISUID
[0x00000800] = { idx = 3, char = "S" },
},
group =
{
-- S_IRGRP
[0x00000020] = { idx = 4, char = "r" },
-- S_IWGRP
[0x00000010] = { idx = 5, char = "w" },
-- S_IXGRP
[0x00000008] = { idx = 6, char = "x" },
-- S_ISGID
[0x00000400] = { idx = 6, char = "S" },
},
other =
{
-- S_IROTH
[0x00000004] = { idx = 7, char = "r" },
-- S_IWOTH
[0x00000002] = { idx = 8, char = "w" },
-- S_IXOTH
[0x00000001] = { idx = 9, char = "x" },
-- S_ISVTX
[0x00000200] = { idx = 9, char = "t" },
},
},
-- bit mask used to extract the file type code from a mode
-- S_IFMT = 00170000 (octal)
S_IFMT = 0xF000,
FileType =
{
-- S_IFSOCK
[0x0000C000] = { char = "s", str = "socket" },
-- S_IFLNK
[0x0000A000] = { char = "l", str = "symbolic link" },
-- S_IFREG
[0x00008000] = { char = "-", str = "file" },
-- S_IFBLK
[0x00006000] = { char = "b", str = "block device" },
-- S_IFDIR
[0x00004000] = { char = "d", str = "directory" },
-- S_IFCHR
[0x00002000] = { char = "c", str = "char device" },
-- S_IFIFO
[0x00001000] = { char = "p", str = "named pipe" },
},
--- Converts a numeric ACL mode to a file type char
--
-- @param mode number containing the ACL mode
-- @return char containing the file type
FtypeToChar = function(mode)
local code = bit.band(mode, Util.S_IFMT)
if Util.FileType[code] then
return Util.FileType[code].char
else
stdnse.print_debug(1,"FtypeToChar: Unkown file type, mode: %o", mode)
return ""
end
end,
--- Converts a numeric ACL mode to a file type string
--
-- @param mode number containing the ACL mode
-- @return string containing the file type name
FtypeToString = function(mode)
local code = bit.band(mode, Util.S_IFMT)
if Util.FileType[code] then
return Util.FileType[code].str
else
stdnse.print_debug(1,"FtypeToString: Unknown file type, mode: %o", mode)
return ""
end
end,
--- Converts a numeric ACL mode to a string in an octal
-- number format.
--
-- @param mode number containing the ACL mode
-- @return string containing the octal ACL mode
FmodeToOctalString = function(mode)
local code = bit.band(mode, Util.S_IFMT)
if Util.FileType[code] then
code = bit.bxor(mode, code)
else
code = mode
stdnse.print_debug(1,"FmodeToOctalString: Unknown file type, mode: %o", mode)
end
return stdnse.tooctal(code)
end,
--- Converts a numeric ACL to it's character equivalent eg. (rwxr-xr-x)
--
-- @param mode number containing the ACL mode
-- @return string containing the ACL characters
FpermToString = function(mode)
local tmpacl, acl = {}, ""
for i = 1, 9 do
tmpacl[i] = "-"
end
for user,_ in pairs(Util.Fperm) do
local t = Util.Fperm[user]
for i in pairs(t) do
local code = bit.band(mode, i)
if t[code] then
-- save set-ID and sticky bits
if tmpacl[t[code].idx] == "x" then
if t[code].char == "S" then
tmpacl[t[code].idx] = "s"
else
tmpacl[t[code].idx] = t[code].char
end
elseif tmpacl[t[code].idx] == "S" then
if t[code].char == "x" then
tmpacl[t[code].idx] = "s"
end
else
tmpacl[t[code].idx] = t[code].char
end
end
end
end
for i = 1,#tmpacl do
acl = acl .. tmpacl[i]
end
return acl
end,
--- Converts the NFS file attributes to a string.
--
-- An optional second argument is the mactime to use
--
-- @param attr table returned by NFS GETATTR or ACCESS
-- @param mactime to use, the default value is mtime
-- Possible values: mtime, atime, ctime
-- @return string containing the file attributes
format_nfsfattr = function(attr, mactime)
local time = "mtime"
if mactime then
time = mactime
end
return string.format("%s%s uid: %5d gid: %5d %6s %s",
rpc.Util.FtypeToChar(attr.mode),
rpc.Util.FpermToString(attr.mode),
attr.uid,
attr.gid,
rpc.Util.SizeToHuman(attr.size),
rpc.Util.TimeToString(attr[time].seconds))
end,
marshall_int32 = function(int32, count)
if count then
return bin.pack(">i" .. count, int32)
end
return bin.pack(">i", int32)
end,
unmarshall_int32 = function(data, pos, count)
if count then
return bin.unpack(">i" .. count, data, pos)
end
return bin.unpack(">i", data, pos)
end,
marshall_uint32 = function(uint32, count)
if count then
return bin.pack(">I" .. count, uint32)
end
return bin.pack(">I", uint32)
end,
unmarshall_uint32 = function(data, pos, count)
if count then
return bin.unpack(">I" .. count, data, pos)
end
return bin.unpack(">I", data, pos)
end,
marshall_int64 = function(int64, count)
if count then
return bin.pack(">l" .. count, int64)
end
return bin.pack(">l", int64)
end,
unmarshall_int64 = function(data, pos, count)
if count then
return bin.unpack(">l" .. count, data, pos)
end
return bin.unpack(">l", data, pos)
end,
marshall_uint64 = function(uint64, count)
if count then
return bin.pack(">L" .. count, uint64)
end
return bin.pack(">L", uint64)
end,
unmarshall_uint64 = function(data, pos, count)
if count then
return bin.unpack(">L" .. count, data, pos)
end
return bin.unpack(">L", data, pos)
end,
marshall_opaque = function(data)
local opaque = bin.pack(">A", data)
for i = 1, Util.CalcFillBytes(data:len()) do
opaque = opaque .. string.char(0x00)
end
return opaque
end,
unmarshall_opaque = function(len, data, pos)
return bin.unpack(">A" .. len, data, pos)
end,
marshall_vopaque = function(data)
local opaque, l
l = data:len()
opaque = Util.marshall_uint32(l) .. bin.pack(">A", data)
for i = 1, Util.CalcFillBytes(l) do
opaque = opaque .. string.char(0x00)
end
return opaque
end,
unmarshall_vopaque = function(len, data, pos)
local opaque, pad
pad = Util.CalcFillBytes(len)
pos, opaque = bin.unpack(">A" .. len, data, pos)
return pos + pad, opaque
end,
unmarshall_nfsftype = function(data, pos, count)
return Util.unmarshall_uint32(data, pos, count)
end,
unmarshall_nfsfmode = function(data, pos, count)
return Util.unmarshall_uint32(data, pos, count)
end,
unmarshall_nfssize3 = function(data, pos, count)
return Util.unmarshall_uint64(data, pos, count)
end,
unmarshall_nfsspecdata3 = function(data, pos)
local specdata3 = {}
pos, specdata3.specdata1,
specdata3.specdata2 = Util.unmarshall_uint32(data, pos, 2)
return pos, specdata3
end,
--- Unmarshall NFSv3 fileid field of the NFS attributes
--
-- @param data The data being processed.
-- @param pos The position within <code>data</code>
-- @return pos The new position
-- @return uint64 The decoded fileid
unmarshall_nfsfileid3 = function(data, pos)
return Util.unmarshall_uint64(data, pos)
end,
--- Unmarshall NFS time
--
-- @param data The data being processed.
-- @param pos The position within <code>data</code>
-- @return pos The new position
-- @return table The decoded NFS time table.
unmarshall_nfstime = function(data, pos)
local nfstime = {}
pos, nfstime.seconds,
nfstime.nseconds = Util.unmarshall_uint32(data, pos, 2)
return pos, nfstime
end,
--- Unmarshall NFS file attributes
--
-- @param data The data being processed.
-- @param pos The position within <code>data</code>
-- @param number The NFS version.
-- @return pos The new position
-- @return table The decoded file attributes table.
unmarshall_nfsattr = function(data, pos, nfsversion)
local attr = {}
pos, attr.type = Util.unmarshall_nfsftype(data, pos)
pos, attr.mode = Util.unmarshall_nfsfmode(data, pos)
pos, attr.nlink, attr.uid,
attr.gid = Util.unmarshall_uint32(data, pos, 3)
if (nfsversion < 3) then
pos, attr.size, attr.blocksize, attr.rdev, attr.blocks,
attr.fsid, attr.fileid = Util.unmarshall_uint32(data, pos, 6)
elseif (nfsversion == 3) then
pos, attr.size = Util.unmarshall_nfssize3(data, pos)
pos, attr.used = Util.unmarshall_nfssize3(data, pos)
pos, attr.rdev = Util.unmarshall_nfsspecdata3(data, pos)
pos, attr.fsid = Util.unmarshall_uint64(data, pos)
pos, attr.fileid = Util.unmarshall_nfsfileid3(data, pos)
else
stdnse.print_debug(4, "unmarshall_nfsattr: unsupported NFS version %d",
nfsversion)
return -1, nil
end
pos, attr.atime = Util.unmarshall_nfstime(data, pos)
pos, attr.mtime = Util.unmarshall_nfstime(data, pos)
pos, attr.ctime = Util.unmarshall_nfstime(data, pos)
return pos, attr
end,
--- Returns a string containing date and time
--
-- @param number of seconds since some given start time
-- (the "epoch")
-- @return string that represents time.
TimeToString = function(time)
return os.date("!%F %H:%M", time)
end,
--- Converts the size in bytes to a human readable format
--
-- An optional second argument is the size of a block
-- @usage
-- size_tohuman(1024) --> 1024.0B
-- size_tohuman(926548776) --> 883.6M
-- size_tohuman(246548, 1024) --> 240.8K
-- size_tohuman(246548, 1000) --> 246.5K
--
-- @param size in bytes
-- @param blocksize represents the number of bytes per block
-- Possible values are: 1024 or 1000
-- Default value is: 1024
-- @return string containing the size in the human readable
-- format
SizeToHuman = function(size, blocksize)
local bs, idx = 1024, 1
local unit = { "B", "K", "M", "G" , "T"}
if blocksize and blocksize == 1000 then
bs = blocksize
end
for i=1, #unit do
if (size > bs and idx < #unit) then
size = size / bs
idx = idx + 1
end
end
return string.format("%.1f%s", size, unit[idx])
end,
format_access = function(mask, version)
local ret, nfsobj = "", NFS:new()
if nfsobj:AccessRead(mask, version) ~= 0 then
ret = "Read "
else
ret = "NoRead "
end
if nfsobj:AccessLookup(mask, version) ~= 0 then
ret = ret .. "Lookup "
else
ret = ret .. "NoLookup "
end
if nfsobj:AccessModify(mask, version) ~= 0 then
ret = ret .. "Modify "
else
ret = ret .. "NoModify "
end
if nfsobj:AccessExtend(mask, version) ~= 0 then
ret = ret .. "Extend "
else
ret = ret .. "NoExtend "
end
if nfsobj:AccessDelete(mask, version) ~= 0 then
ret = ret .. "Delete "
else
ret = ret .. "NoDelete "
end
if nfsobj:AccessExecute(mask, version) ~= 0 then
ret = ret .. "Execute"
else
ret = ret .. "NoExecute"
end
return ret
end,
--- Return the pathconf filesystem table
--
-- @param pconf table returned by the NFSv3 PATHCONF call
-- @param nfsversion the version of the remote NFS server
-- @return fs table that contains the remote filesystem
-- pathconf information.
calc_pathconf_table = function(pconf, nfsversion)
local fs = {}
if nfsversion ~= 3 then
return nil, "ERROR: unsupported NFS version."
end
fs.linkmax = pconf.linkmax
fs.name_max = pconf.name_max
if pconf.chown_restricted then
fs.chown_restricted = "True"
else
fs.chown_restricted = "False"
end
return fs, nil
end,
--- Calculate and return the fsinfo filesystem table
--
-- @param fsinfo table returned by the NFSv3 FSINFO call
-- @param nfsversion the version of the remote NFS server
-- @param human if set show the size in the human
-- readable format.
-- @return fs table that contains the remote filesystem
-- information.
calc_fsinfo_table = function(fsinfo, nfsversion, human)
local fs = {}
local nfsobj = NFS:new()
if nfsversion ~= 3 then
return nil, "ERROR: unsupported NFS version."
end
fs.maxfilesize = Util.SizeToHuman(fsinfo.maxfilesize)
if nfsobj:FSinfoLink(fsinfo.properties, nfsversion) ~= 0 then
fs.link = "True"
else
fs.link = "False"
end
if nfsobj:FSinfoSymlink(fsinfo.properties, nfsversion) ~= 0 then
fs.symlink = "True"
else
fs.symlink = "False"
end
return fs, nil
end,
--- Calculate and return the fsstat filesystem table
--
-- @param stats table returned by the NFSv3 FSSTAT or
-- NFSv2 STATFS calls
-- @param nfsversion the version of the remote NFS server
-- @param human if set show the size in the human
-- readable format.
-- @return df table that contains the remote filesystem
-- attributes.
calc_fsstat_table = function(stats, nfsversion, human)
local df, base = {}, 1024
local size, free, total, avail, used, use
if (nfsversion == 3) then
free = stats.fbytes
size = stats.tbytes
avail = stats.abytes
elseif (nfsversion == 2) then
df.bsize = stats.block_size
free = stats.free_blocks * df.bsize
size = stats.total_blocks * df.bsize
avail = stats.available_blocks * df.bsize
else
return nil, "ERROR: unsupported NFS version."
end
if (human) then
if (df.bsize) then
df.bsize = Util.SizeToHuman(df.bsize)
end
df.size = Util.SizeToHuman(size)
df.available = Util.SizeToHuman(avail)
used = size - free
avail = avail
df.used = Util.SizeToHuman(used)
total = used + avail
else
free = free / base
df.size = size / base
df.available = avail / base
used = df.size - free
df.used = used
total = df.used + df.available
end
use = math.ceil(used * 100 / total)
df.use = string.format("%.0f%%", use)
return df, nil
end,
--- Converts a RPC program name to it's equivalent number
--
-- @param prog_name string containing the name of the RPC program
-- @return num number containing the program ID
ProgNameToNumber = function(prog_name)
local status
if not( RPC_PROGRAMS ) then
status, RPC_PROGRAMS = datafiles.parse_rpc()
if ( not(status) ) then
return
end
end
for num, name in pairs(RPC_PROGRAMS) do
if ( prog_name == name ) then
return num
end
end
return
end,
--- Converts the RPC program number to it's equivalent name
--
-- @param num number containing the RPC program identifier
-- @return string containing the RPC program name
ProgNumberToName = function( num )
local status
if not( RPC_PROGRAMS ) then
status, RPC_PROGRAMS = datafiles.parse_rpc()
if ( not(status) ) then
return
end
end
return RPC_PROGRAMS[num]
end,
--
-- Calculates the number of fill bytes needed
-- @param length contains the length of the string
-- @return the amount of pad needed to be divideable by 4
CalcFillBytes = function(length)
-- calculate fill bytes
if math.mod( length, 4 ) ~= 0 then
return (4 - math.mod( length, 4))
else
return 0
end
end
}
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