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---
-- FTP functions.
--
-- @copyright Same as Nmap--See http://nmap.org/book/man-legal.html
local comm = require "comm"
local stdnse = require "stdnse"
local string = require "string"
_ENV = stdnse.module("ftp", stdnse.seeall)
local ERROR_MESSAGES = {
["EOF"] = "connection closed",
["TIMEOUT"] = "connection timeout",
["ERROR"] = "failed to receive data"
}
--- Connects to the FTP server based on the provided options.
--
-- @param host The host table
-- @param port The port table
-- @param opts The connection option table, possible options:
-- timeout: generic timeout value
-- recv_before: receive data before returning
-- @return socket The socket descriptor, or nil on errors
-- @return response The response received on success and when
-- the recv_before is set, or the error message on failures.
connect = function(host, port, opts)
local socket, _, _, ret = comm.tryssl(host, port, '', opts)
if not socket then
return socket, (ERROR_MESSAGES[ret] or 'unspecified error')
end
return socket, ret
end
---
-- Read an FTP reply and return the numeric code and the message. See RFC 959,
-- section 4.2.
-- @param buffer should have been created with
-- <code>stdnse.make_buffer(socket, "\r?\n")</code>.
-- @return numeric code or <code>nil</code>.
-- @return text reply or error message.
function read_reply(buffer)
local readline
local line, err
local code, message
local _, p, tmp
line, err = buffer()
if not line then
return line, err
end
-- Single-line response?
code, message = string.match(line, "^(%d%d%d) (.*)$")
if code then
return tonumber(code), message
end
-- Multi-line response?
_, p, code, message = string.find(line, "^(%d%d%d)-(.*)$")
if p then
while true do
line, err = buffer()
if not line then
return line, err
end
tmp = string.match(line, "^%d%d%d (.*)$")
if tmp then
message = message .. "\n" .. tmp
break
end
message = message .. "\n" .. line
end
return tonumber(code), message
end
return nil, string.format("Unparseable response: %q", line)
end
return _ENV;