fetch.lua


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--
-- ~~~ fetch a pawsd service
--

-- require a name & service index to fetch
if not arg[1] or not arg[2] then
    error("server name & index required")
end

-- imports
local PawSD = require("src/pawsd/variables")
local Servers = require("src/pawsd/servers")
require("src/utils")

local pawsd = {}
pawsd.response = require("src/pawsd/metadata")
pawsd.signature = require("src/pawsd/signature")
pawsd.service = require("src/pawsd/service")

local socket = require("socket")
local client = assert(socket.tcp())

-- get arguments & check validity
local server = Servers[arg[1]]
local index = arg[2]

if not server then
    error("server not found")
end

-- connect to client
client:connect(server.host, server.port)

-- send request
local request = string.fromhex(PawSD.Magic.REQUEST .. PawSD.Version .. PawSD.Verbs.FETCH_SERVICE .. server.keyalg .. "0020" .. server.key .. index)
client:send(request)

-- print response
local response = {}

while true do
    local packet, status = client:receive(1)

    -- if packet then print(response) end
    table.insert(response, packet)
    if status == "closed" then break end
end

-- check that the response is correct
local responseMagic = pawsd.response.type(response)
if not responseMagic == PawSD.Magic.RESPONSE then
    error("invalid response")
end

print("R> Response Magic:                                                                          " .. responseMagic)

-- check that the status is okay
local responseStatus = pawsd.response.status(response)
if not responseStatus == PawSD.Responses.OK then
    error("unsuccessful request")
end

print("R> Response Status:                                                                         " .. responseStatus)

-- get signature information
local responseSignature = pawsd.signature.get(response)
local responseSignatureValid = pawsd.signature.validate(response)

print("R> Signature:                                                                               " .. responseSignature)

-- get service info
local responseIndex = pawsd.service.index(response)
local responseFlags = pawsd.service.flags(response)

print("R> Index:                                                                                   " .. responseIndex)
print("R> Flags:                                                                                   " .. responseFlags)

-- get number of records
local responseRecords = pawsd.service.records.all(response)

-- close connection
client:close()