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o [NSE] Added the script broadcast-dhcp-discover that sends a DHCP discover

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message to the broadcast address and collects and reports the network
  information received from the DHCP server. [Patrik]
This commit is contained in:
patrik
2011-07-21 11:56:15 +00:00
parent 29c973befa
commit cbf959aecc
4 changed files with 228 additions and 2 deletions
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28
nselib/dhcp.lua
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@@ -402,7 +402,31 @@ local function dhcp_send(interface, host, packet, transaction_id)
return true, data
end
local function dhcp_build(request_type, ip_address, mac_address, request_options, overrides, lease_time, transaction_id)
--- Builds a DHCP packet
--
--@param request_type The type of request as an integer (use the <code>request_types</code> table at the
-- top of this file).
--@param ip_address Your ip address (as a dotted-decimal string). This tells the DHCP server where to
-- send the response. Setting it to "255.255.255.255" or "0.0.0.0" is generally acceptable (if not,
-- host.ip_src can work).
--@param mac_address Your mac address (as a string up to 16 bytes) where the server will send the response. Like
-- <code>ip_address</code>, setting to the broadcast address (FF:FF:FF:FF:FF:FF) is
-- common (host.mac_addr_src works).
--@param request_options [optional] The options to request from the server, as an array of integers. For the
-- acceptable options, see the <code>actions</code> table above or have a look at rfc2132.
-- Some DHCP servers (such as my Linksys WRT54g) will ignore this list and send whichever
-- information it wants. Default: all options marked as 'default' in the <code>actions</code>
-- table above are requested (the typical interesting ones) if no verbosity is given.
-- If any level of verbosity is on, get all types.
--@param overrides [optional] A table of overrides. If a field in the table matches a field in the DHCP
-- packet (see rfc2131 section 2 for a list of possible fields), the value in the table
-- will be sent instead of the default value.
--@param lease_time [optional] The lease time used when requestint an IP. Default: 1 second.
--@param transaction_id The identity of the transaction.
--
--@return status (true or false)
--@return The parsed response, as a table.
function dhcp_build(request_type, ip_address, mac_address, request_options, overrides, lease_time, transaction_id)
local packet = ''
-- Set up the default overrides
@@ -455,7 +479,7 @@ end
--
--@param data The DHCP packet data. Any padding at the end of the packet will be ignored (by default,
-- DHCP packets are padded with \x00 bytes).
local function dhcp_parse(data, transaction_id)
function dhcp_parse(data, transaction_id)
local pos = 1
local result = {}