description = [[
Retrieves POP3 email server capabilities.
POP3 capabilities are defined in RFC 2449. The CAPA command allows a client to
ask a server what commands it supports and possibly any site-specific policy.
Besides the list of supported commands, the IMPLEMENTATION string giving the
server version may be available.
]]
---
-- @output
-- 110/tcp open pop3
-- |_ pop3-capabilities: USER CAPA RESP-CODES UIDL PIPELINING STLS TOP SASL(PLAIN)
author = "Philip Pickering"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"default","discovery","safe"}
require 'pop3'
require 'shortport'
require 'stdnse'
portrule = shortport.port_or_service({110,995},{"pop3","pop3s"})
action = function(host, port)
local capa, err = pop3.capabilities(host, port)
if type(capa) == "table" then
-- Convert the capabilities table into an array of strings.
local capstrings = {}
local cap, args
for cap, args in pairs(capa) do
local capstr = cap
if type(args) == "string" then capstr = capstr .. "(" .. args .. ")" end
if type(args) == "table" then
local arg
capstr = capstr .. "("
for i, arg in ipairs(args) do
capstr = capstr .. arg .. " "
end
capstr = string.sub(capstr, 1, #capstr - 1) .. ")"
end
table.insert(capstrings, capstr)
end
return stdnse.strjoin(" ", capstrings)
elseif type(err) == "string" then
stdnse.print_debug(1, "%s: '%s' for %s", SCRIPT_NAME, err, host.ip)
return
else
return "server doesn't support CAPA"
end
end
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