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Current File : /usr/share/nmap/scripts/quake3-info.nse
local comm = require "comm"
local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
local stringaux = require "stringaux"
local table = require "table"

description = [[
Extracts information from a Quake3 game server and other games which use the same protocol.
]]

---
-- @usage
-- nmap -sU -sV -Pn --script quake3-info.nse -p <port> <target>
--
-- @output
-- PORT      STATE         SERVICE VERSION
-- 27960/udp open          quake3  Quake 3 dedicated server
-- | quake3-info:
-- | PLAYERS:
-- |     1. cyberix (frags: 0/20, ping: 4)
-- | BASIC OPTIONS:
-- |     capturelimit: 8
-- |     dmflags: 0
-- |     elimflags: 0
-- |     fraglimit: 20
-- |     gamename: baseoa
-- |     mapname: oa_dm1
-- |     protocol: 71
-- |     timelimit: 0
-- |     version: ioq3 1.36+svn1933-1/Ubuntu linux-x86_64 Apr  4 2011
-- |     videoflags: 7
-- |     voteflags: 767
-- | OTHER OPTIONS:
-- |     bot_minplayers: 0
-- |     elimination_roundtime: 120
-- |     g_allowVote: 1
-- |     g_altExcellent: 0
-- |     g_delagHitscan: 0
-- |     g_doWarmup: 0
-- |     g_enableBreath: 0
-- |     g_enableDust: 0
-- |     g_gametype: 0
-- |     g_instantgib: 0
-- |     g_lms_mode: 0
-- |     g_maxGameClients: 0
-- |     g_needpass: 0
-- |     g_obeliskRespawnDelay: 10
-- |     g_rockets: 0
-- |     g_voteGametypes: /0/1/3/4/5/6/7/8/9/10/11/12/
-- |     g_voteMaxFraglimit: 0
-- |     g_voteMaxTimelimit: 0
-- |     g_voteMinFraglimit: 0
-- |     g_voteMinTimelimit: 0
-- |     sv_allowDownload: 0
-- |     sv_floodProtect: 1
-- |     sv_hostname: noname
-- |     sv_maxPing: 0
-- |     sv_maxRate: 0
-- |     sv_maxclients: 8
-- |     sv_minPing: 0
-- |     sv_minRate: 0
-- |_    sv_privateClients: 0

author = "Toni Ruottu"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"default", "discovery", "safe", "version"}


local function range(first, last)
  local list = {}
  for i = first, last do
    table.insert(list, i)
  end
  return list
end

portrule = shortport.version_port_or_service(range(27960, 27970), {'quake3'}, 'udp')

local function parsefields(data)
  local fields = {}
  local parts = stringaux.strsplit("\\", data)
  local nullprefix = table.remove(parts, 1)
  if nullprefix ~= "" then
    stdnse.debug2("unrecognized field format, skipping options")
    return {}
  end
  for i = 1, #parts, 2 do
    local key = parts[i]
    local value = parts[i + 1]
    fields[key] = value
  end
  return fields
end

local function parsename(data)
  local parts = stringaux.strsplit('"', data)
  if #parts ~= 3 then
    return nil
  end
  local e1 = parts[1]
  local name = parts[2]
  local e2 = parts[3]
  local extra = e1 .. e2
  if extra ~= "" then
    return nil
  end
  return name
end

local function parseplayer(data)
  local parts = stringaux.strsplit(" ", data)
  if #parts < 3 then
    stdnse.debug2("player info line is missing elements, skipping a player")
    return nil
  end
  if #parts > 3 then
    stdnse.debug2("player info line has unknown elements, skipping a player")
    return nil
  end
  local player = {}
  player.frags = parts[1]
  player.ping = parts[2]
  player.name = parsename(parts[3])
  if player.name == nil then
    stdnse.debug2("invalid player name serialization, skipping a player")
    return nil
  end
  return player
end

local function parseplayers(data)
  local players = {}
  for _, p in ipairs(data) do
    local player = parseplayer(p)
    if player then
      table.insert(players, player)
    end
  end
  return players
end

local function is_leader(a, b)
  local collide = a.name == b.name
  local even = a.frags == b.frags
  local leads = a.frags > b.frags
  local alphab = a.name > b.name
  local faster = a.ping > b.ping
  return leads or (even and alphab) or (even and collide and faster)
end

local function formatplayers(players, fraglimit)
  table.sort(players, is_leader)
  local printable = {}
  for i, player in ipairs(players) do
    local name = player.name
    local ping = player.ping
    local frags = player.frags
    if fraglimit then
      frags = string.format("%s/%s", frags, fraglimit)
    end
    table.insert(printable, string.format("%d. %s (frags: %s, ping: %s)", i, name, frags, ping))
  end
  printable["name"] = "PLAYERS:"
  return printable
end

local function formatfields(fields, title)
  local printable = {}
  for key, value in pairs(fields) do
    local kv = string.format("%s: %s", key, value)
    table.insert(printable, kv)
  end
  table.sort(printable)
  printable["name"] = title
  return printable
end

local function assorted(fields)
  local basic = {}
  local other = {}
  for key, value in pairs(fields) do
    if string.find(key, "_") == nil then
      basic[key] = value
    else
      other[key] = value
    end
  end
  return basic, other
end

action = function(host, port)
  local GETSTATUS = "\xff\xff\xff\xffgetstatus\n"
  local STATUSRESP = "\xff\xff\xff\xffstatusResponse"

  local status, data = comm.exchange(host, port, GETSTATUS, {["proto"] = "udp"})
  if not status then
    return
  end
  local parts = stringaux.strsplit("\n", data)
  local header = table.remove(parts, 1)
  if header ~= STATUSRESP then
    return
  end
  if #parts < 2 then
    stdnse.debug2("incomplete status response, script abort")
    return
  end
  local nullend = table.remove(parts)
  if nullend ~= "" then
    stdnse.debug2("missing terminating endline, script abort")
    return
  end
  local field_data = table.remove(parts, 1)
  local player_data = parts

  local fields = parsefields(field_data)
  local players = parseplayers(player_data)

  local basic, other = assorted(fields)

  -- Previously observed version strings:
  -- "tremulous 1.1.0 linux-x86_64 Aug  5 2010"
  -- "ioq3 1.36+svn1933-1/Ubuntu linux-x86_64 Apr  4 2011"
  local versionline = basic["version"]
  if versionline then
    local fields = stringaux.strsplit(" ", versionline)
    local product = fields[1]
    local version = fields[2]
    local osline = fields[3]
    port.version.name = "quake3"
    port.version.product = product
    port.version.version = version
    if string.find(osline, "linux") then
      port.version.ostype = "Linux"
    end
    if string.find(osline, "win") then
      port.version.ostype = "Windows"
    end
    nmap.set_port_version(host, port)
  end

  local fraglimit = fields["fraglimit"]
  if not fraglimit then
    fraglimit = "?"
  end

  local response = {}
  table.insert(response, formatplayers(players, fraglimit))
  table.insert(response, formatfields(basic, "BASIC OPTIONS:"))
  if nmap.verbosity() > 0 then
    table.insert(response, formatfields(other, "OTHER OPTIONS:"))
  end
  return stdnse.format_output(true, response)
end

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