NAME

dnsjit.output.tcpcli - Simple, length aware, TCP client

SYNOPSIS

local output = require("dnsjit.output.tcpcli").new("127.0.0.1", "53")

DESCRIPTION

Simple TCP client that takes any payload you give it, sends the length of the payload as an unsigned 16 bit integer and then sends the payload. When receiving it will first retrieve the length of the payload as an unsigned 16 bit integer and it will stall until it gets, even if nonblocking mode is used. Then it will retrieve at least that amount of bytes, if nonblocking mode is used here then it will return a payload object with length zero if there was nothing to receive or if the full payload have not been received yet. Additional calls will continue retrieving the payload.

Attributes

timeout: A core.timespec that is used when producing objects.

Functions

Tcpcli.new(): Create a new Tcpcli output.
Tcpcli:timeout(seconds, nanoseconds): Set the timeout when producing objects.
Tcpcli:connect(host, port): Connect to the host and port and return 0 if successful.
Tcpcli:nonblocking(bool): Enable (true) or disable (false) nonblocking mode and return 0 if successful, if bool is not specified then return if nonblocking mode is on (true) or off (false).
Tcpcli:receive(): Return the C functions and context for receiving objects, these objects will be sent.
Tcpcli:produce(): Return the C functions and context for producing objects, these objects are received. If nonblocking mode is enabled the producer will return a payload object with length zero if there was nothing to receive or if the full payload have not been received yet. If nonblocking mode is disabled the producer will wait for data and if timed out (see timeout) it will return a payload object with length zero. If a timeout happens during during the first stage, getting the length, it will fail and return nil. Additional calls will continue retrieving the payload. The producer returns nil on error.
Tcpcli:packets(): Return the number of "packets" sent, actually the number of completely sent payloads.
Tcpcli:received(): Return the number of "packets" received, actually the number of completely received DNS messages.
Tcpcli:errors(): Return the number of errors when sending.

AUTHORS and CONTRIBUTORS

Jerry Lundström (DNS-OARC), Tomáš Křížek (CZ.NIC), Petr Špaček (ISC)

Maintained by DNS-OARC

https://www.dns-oarc.net/

BUGS

For issues and feature requests please use:

https://github.com/DNS-OARC/dnsjit/issues

For question and help please use:

admin@dns-oarc.net