#tftp #packet-parser #packet #parser #protocols #networking

tftp-packet

A library for creating and parsing TFTP packets

1 unstable release

0.1.0 Jul 11, 2022

#2916 in Parser implementations

MIT license

19KB
422 lines

TFTP packet parser in Rust

Based on rfc 1350.

This is a simple library that parses tftp byte packets. See the [docs] for more information.

The tftp packet

WRQ/RRQ

Opcode Filename 0 Mode 0
2 bytes string 1 byte string 1 byte
01 or 02 as u16 "file" as [u8] 0 as u8 "octet" as [u8] 0 as u8

DATA

Opcode Block # Data
2 bytes 2 bytes 0 - 512 bytes
03 as u16 1 - x as u16 Data Chunk as [u8]
  • Block #: Increments with each block sent
  • Data: Transmission terminates automatically if Packet length < 512

ACK

Opcode Block #
2 bytes 2 bytes
04 as u16 1 - x as u16

ERROR

Opcode Error Code Error Message 0
2 bytes 2 bytes string 1 byte
05 as u16 x as u16 "msg" as [u8] 0as u8

Protocol

WRQ

sequenceDiagram
    participant Client
    participant Server

    Client->>Server: WRQ, TID=69

    Note right of Server: Block #35;: 0
    Server->>Client: ACK, TID=xyz

    loop TID=xyz
        Client-->>Server: DATA
        Server-->>Client: ACK
    end

Dependencies

~1MB
~20K SLoC