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a285f82299
available rather than lines if neither the "bytes" nor "lines" options are given. Thanks to Brandon for reporting a problem which he noticed in the dns-test-open-recursion script. [Kris]
137 lines
3.1 KiB
Lua
137 lines
3.1 KiB
Lua
-- Kris Katterjohn 04/2008
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module(..., package.seeall)
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------
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--
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-- The Functions:
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--
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-- get_banner(host, port, [opts])
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-- exchange(host, port, data, [opts])
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--
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-- get_banner() does just what it sounds like it does: connects to the
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-- host, reads whatever it gives us, and then returns it.
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--
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-- exchange() connects to the host, sends the requested data, reads
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-- whatever it gives us, and then returns it.
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--
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-- Both of these functions return multiple values so that they can be
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-- used with exception handling via nmap.new_try(). The second value
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-- they return is either the response from the host, or the error message
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-- from one of the previous calls (connect, send, receive*).
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--
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-- These functions can be passed a table of options with the following keys:
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--
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-- bytes: Specifies the minimum amount of bytes are to be read from the host
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-- lines: Specifies the minimum amount of lines are to be read from the host
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-- proto: Specifies the protocol to be used with the connect() call
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-- timeout: Sets the socket's timeout with nmap.set_timeout()
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--
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-- If neither lines nor bytes are specified, the calls attempt to read as many
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-- bytes as possible. If only bytes is specified, then it only tries to read
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-- that many bytes. Likewise, it only lines if specified, then it only tries
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-- to read that many lines. If they're both specified, the lines value is used.
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--
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------
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-- Makes sure that opts exists and the default proto is there
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local initopts = function(opts)
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if not opts then
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opts = {}
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end
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if not opts.proto then
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opts.proto = "tcp"
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end
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return opts
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end
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-- Sets up the socket and connects to host:port
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local setup_connect = function(host, port, opts)
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if type(host) ~= "table" then
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host = {ip = host}
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end
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local target = host.targetname or host.ip or host.name
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if type(port) ~= "table" then
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port = {number = port}
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end
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local sock = nmap.new_socket()
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if opts.timeout then
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sock:set_timeout(opts.timeout)
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end
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local status, err = sock:connect(target, port.number, opts.proto)
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if not status then
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return status, err
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end
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-- If nothing is given, specify bytes=1 so NSE reads everything
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if not opts.lines and not opts.bytes then
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opts.bytes = 1
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end
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return true, sock
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end
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local read = function(sock, opts)
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local response, status
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if opts.lines then
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status, response = sock:receive_lines(opts.lines)
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return status, response
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end
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status, response = sock:receive_bytes(opts.bytes)
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return status, response
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end
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get_banner = function(host, port, opts)
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opts = initopts(opts)
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local status, sock = setup_connect(host, port, opts)
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local ret
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if not status then
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-- sock is an error message in this case
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return status, sock
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end
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status, ret = read(sock, opts)
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sock:close()
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return status, ret
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end
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exchange = function(host, port, data, opts)
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opts = initopts(opts)
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local status, sock = setup_connect(host, port, opts)
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local ret
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if not status then
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-- sock is an error message in this case
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return status, sock
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end
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status, ret = sock:send(data)
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if not status then
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sock:close()
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return status, ret
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end
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status, ret = read(sock, opts)
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sock:close()
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return status, ret
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end
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