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  1. 1
      .gitignore
  2. 661
      COPYING
  3. 7
      Cargo.lock
  4. 8
      Cargo.toml
  5. 2
      README.md
  6. 4
      TODO
  7. 161
      src/args.rs
  8. 26
      src/error.rs
  9. 170
      src/main.rs
  10. 391
      src/protocol.rs

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COPYING
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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "ddtu"
version = "0.1.0"

8
Cargo.toml
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[package]
name = "ddtu"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]

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README.md
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# ddtu - digital data transferring utility
### Transfer one thing from __here__ to __there__ via the Internet connection

4
TODO
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1. Write base foundation for sending and receiving information
2. Wire it all together
3. Make it encrypted
4. Daemon

161
src/args.rs
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/*
ddtu - digital data transferring utility
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
*/
use super::error::Error;
use std::path;
#[derive(PartialEq, Eq, Debug)]
pub enum RunMode {
SEND,
RECEIVE,
SYNC,
DAEMON,
}
#[derive(PartialEq, Eq, Debug)]
pub enum Type {
TEXT,
FILE,
DIR,
}
#[derive(Debug)]
pub struct Args {
pub help: bool,
pub version: bool,
pub mode: RunMode,
pub send_type: Type,
pub address_str: String,
pub send_path: path::PathBuf,
pub save_directory: path::PathBuf,
pub sync_directory: path::PathBuf,
pub text_to_send: String,
}
impl Args {
pub fn default() -> Args {
return Args{
help: false,
version: false,
mode: RunMode::DAEMON,
send_type: Type::TEXT,
address_str: "".to_string(),
send_path: path::PathBuf::new(),
save_directory: path::PathBuf::new(),
sync_directory: path::PathBuf::new(),
text_to_send: "".to_string(),
};
}
}
pub fn parse(raw_args: &Vec<String>) -> Result<Args, Error> {
let mut parsed_args: Args = Args::default();
// parse arguments, ignoring the first argument
let arg_amount: usize = raw_args.len();
if arg_amount < 2 {
return Err(Error::new("no arguments"));
}
match raw_args[1].to_lowercase().as_str() {
"help" => {
parsed_args.help = true;
}
"version" => {
parsed_args.version = true;
}
"send" => {
if arg_amount < 4 {
// not enough arguments !
return Err(Error::new("not enough arguments for send mode"));
}
parsed_args.mode = RunMode::SEND;
// type
match raw_args[2].to_lowercase().as_str() {
"text" => {
parsed_args.send_type = Type::TEXT;
parsed_args.text_to_send = String::from(&raw_args[3]);
}
"file" => {
parsed_args.send_type = Type::FILE;
parsed_args.send_path = std::path::Path::new(&raw_args[3]).to_path_buf();
}
"dir" => {
parsed_args.send_type = Type::DIR;
parsed_args.send_path = std::path::Path::new(&raw_args[3]).to_path_buf();
}
_ => {
return Err(Error::new(format!("invalid type {}", raw_args[2]).as_str()));
}
}
// src
if parsed_args.send_type == Type::FILE || parsed_args.send_type == Type::DIR {
// check if exists
match path::Path::new(raw_args[3].as_str()).exists() {
true => {
parsed_args.send_path = path::Path::new(raw_args[3].as_str()).to_path_buf();
}
false => {
return Err(Error::new(format!("\"{}\" does not exist or unreachable", raw_args[3]).as_str()));
}
}
}
}
"recv" => {
if arg_amount < 3 {
// not enough arguments !
return Err(Error::new("not enough arguments for receiving mode"));
}
parsed_args.mode = RunMode::RECEIVE;
parsed_args.address_str = raw_args[2].to_string();
if arg_amount > 3 {
parsed_args.save_directory = path::Path::new(raw_args[3].as_str()).to_path_buf();
}
}
"sync" => {
parsed_args.mode = RunMode::SYNC;
if arg_amount < 3 {
return Err(Error::new("not enough arguments for syncing"));
}
let sync_path: &path::Path = path::Path::new(raw_args[2].as_str());
if !sync_path.exists() || !sync_path.is_dir() {
return Err(Error::new(format!("{} does not exist or is not a directory", sync_path.display()).as_str()));
}
}
"daemon" => {
parsed_args.mode = RunMode::DAEMON;
}
_ => {
return Err(Error::new(format!("invalid argument {}", raw_args[1]).as_str()));
}
}
return Ok(parsed_args);
}

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src/error.rs
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/*
ddtu - digital data transferring utility
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
*/
pub struct Error {
pub text: String,
}
impl Error {
pub fn new(txt: &str) -> Error {
return Error{
text: txt.to_string(),
};
}
}

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src/main.rs
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/*
ddtu - digital data transferring utility
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
*/
mod args;
mod error;
mod protocol;
use args::{Args, RunMode};
use std::net;
use protocol::Packet;
use protocol::TextPacket;
use protocol::PacketType;
const VERSION: &str = "v0.1.0";
const HELP_MESSAGE: &str =
"ddtu - digital data transferring tool v0.1.0
Usage:
ddtu [FLAG] [MODE] [MODE-specific arguments]
[FLAG]
[help]: ddtu help -> print help message
[version]: ddtu version -> print version
[MODE]
[send]: ddtu send [TYPE] [SRC] -> prepare to send [SRC] of [TYPE] and wait for someone to receive
[recv]: ddtu recv [SRC] [DEST](optional) -> receive anything from another ddtu instance running on [SRC], saving it at [DEST]
[sync]: ddtu sync [DIR] [DEST] -> sync [DIRectory] contents with another ddtu instance on [DEST]
[daemon]: ddtu daemon -> start syncing daemon
[TYPE]
[text]: ddtu send text \'text to send\' -> send text
[file]: ddtu send file \'/home/user/documents/doc.txt\' -> send file doc.txt
[dir]: ddtu send dir \'/home/user/homework\' -> send whole directory recursively
(c) Kasyanov Nikolay Alexeyevich (Unbewohnte)
";
fn main() {
// get and parse arguments
let raw_args: Vec<String> = std::env::args().collect();
let args: Args;
match args::parse(&raw_args) {
Ok(parsed_args) => {
args = parsed_args;
}
Err(error) => {
println!("error parsing arguments: {}", error.text);
return;
}
}
println!("{:?}", args);
// handle them
if args.help {
println!("{}", HELP_MESSAGE);
return;
}
if args.version {
println!("ddtu {}", VERSION);
return;
}
match args.mode {
RunMode::RECEIVE => {
let mut conn: net::TcpStream;
match net::TcpStream::connect(&args.address_str) {
Ok(c) => {
conn = c;
}
Err(error) => {
println!("could not connect to {}: {}", args.address_str, error);
return;
}
}
println!("connected to {}", args.address_str);
match protocol::read_next_packet(&mut conn) {
Ok(packet) => {
match packet.get_type() {
PacketType::TextData => {
let mut text_packet = protocol::TextPacket::empty();
text_packet.from_bytes(packet.as_bytes());
println!("{}", text_packet.text);
}
_ => {
}
}
}
Err(error) => {
println!("error reading packet: {}", error.text);
}
}
}
RunMode::SEND => {
let listener: net::TcpListener;
match net::TcpListener::bind("0.0.0.0:10555") {
Ok(l) => {
listener = l;
}
Err(error) => {
println!("error creating a listener: {}", error);
return;
}
}
let mut conn: net::TcpStream;
let addr: net::SocketAddr;
match listener.accept() {
Ok((c, a)) => {
conn = c;
addr = a;
}
Err(error) => {
println!("error establising a new connection: {}", error);
return;
}
}
println!("{} has connected", addr);
// send text
let textpacket = TextPacket::new(&args.text_to_send);
match protocol::send_packet(&mut conn, &textpacket) {
Ok(()) => {}
Err(error) => {
println!("{}", error.text);
}
}
match conn.shutdown(net::Shutdown::Both) {
Ok(()) => {}
Err(error) => {
println!("could not shutdown the connection: {}", error);
return;
}
}
}
RunMode::DAEMON => {
}
RunMode::SYNC => {
}
}
}

391
src/protocol.rs
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/*
ddtu - digital data transferring utility
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
*/
use super::error::Error;
use std::net;
use std::io::Write;
use std::io::Read;
/*
---PROTOCOL SPECs---
- Packet bytes representation -
First 16 bytes - the total packet length
The next 1 byte - number that represents this packet's type (ID) where:
1: CONNECTION SHUTDOWN PACKET
2: TEXT PACKET
3: FILEINFO PACKET
4: FILEDATA PACKET
Then the internal structure varies from one packet type to the other,
but the content-types are encoded as follows:
u8 - just 1 BE byte
u128 - 16 BE bytes
String - u128 representing the string length and then UTF-8 encoded character bytes
[u8] - u128 as the length of a byte array, then the array itself
*/
fn read_u128(buf: Vec<u8>) -> u128 {
let mut arr: [u8; 16] = [0; 16];
for i in 0..16 {
arr[i] = buf[i];
}
return u128::from_be_bytes(arr);
}
fn read_u128_slice(buf_16: &[u8]) -> u128 {
let mut arr: [u8; 16] = [0; 16];
for i in 0..16 {
arr[i] = buf_16[i];
}
return u128::from_be_bytes(arr);
}
fn read_utf8_string(buf: Vec<u8>) -> String {
return String::from_utf8_lossy(&buf).into_owned();
}
fn read_utf8_string_slice(buf: &[u8]) -> String {
return String::from_utf8_lossy(&buf).into_owned();
}
const CONNECTION_SHUTDOWN_PACKET_ID: u8 = 1;
const TEXT_PACKET_ID: u8 = 2;
const FILEINFO_PACKET_ID: u8 = 3;
const FILEDATA_PACKET_ID: u8 = 4;
const CHUNK_SIZE: usize = 262_144; // 256 KB
#[derive(PartialEq, Eq)]
pub enum PacketType {
ConnectionShutdown,
TextData,
FileInfo,
FileData,
}
pub trait Packet {
fn get_type(&self) -> PacketType;
fn as_bytes(&self) -> Vec<u8>;
fn from_bytes(&mut self, packet_bytes: Vec<u8>) -> Option<Error>;
}
pub struct ConnectionShutdownPacket {}
impl Packet for ConnectionShutdownPacket {
fn get_type(&self) -> PacketType {
return PacketType::ConnectionShutdown;
}
fn as_bytes(&self) -> Vec<u8> {
return vec!(CONNECTION_SHUTDOWN_PACKET_ID.to_be_bytes()[0]);
}
fn from_bytes(&mut self, _packet_bytes: Vec<u8>) -> Option<Error> {
return None;
}
}
pub struct TextPacket {
pub text: String,
}
impl TextPacket {
pub fn empty() -> TextPacket {
return TextPacket{
text: "".to_string(),
};
}
pub fn new(txt: &str) -> TextPacket {
return TextPacket {
text: txt.to_string(),
}
}
}
impl Packet for TextPacket {
fn get_type(&self) -> PacketType {
return PacketType::TextData;
}
fn as_bytes(&self) -> Vec<u8> {
let mut packet_as_bytes: Vec<u8> = Vec::<u8>::new();
packet_as_bytes.extend_from_slice(&TEXT_PACKET_ID.to_be_bytes());
let text_length: u128 = self.text.len() as u128;
packet_as_bytes.extend_from_slice(&text_length.to_be_bytes());
packet_as_bytes.extend_from_slice(&self.text.as_bytes());
return packet_as_bytes;
}
fn from_bytes(&mut self, packet_bytes: Vec<u8>) -> Option<Error> {
if packet_bytes.len() < 18 {
return Some(
Error::new(format!("{} bytes is too small for a text packet to be valid", packet_bytes.len()).as_str()
));
}
// retrieve and check for packet type byte
match packet_bytes[0].to_be() {
TEXT_PACKET_ID => {}
_ => {
return Some(Error::new("packet type is not of a text packet"));
}
}
// get text length
let text_length: u128 = read_u128_slice(&packet_bytes[1..17]);
if text_length as usize > packet_bytes[17..].len() {
return Some(
Error::new(
format!(
"text length ({}) is bigger than provided packet bytes length ({})",
text_length,
packet_bytes[16..].len()
).as_str()
)
);
}
// extract text
self.text = read_utf8_string_slice(&packet_bytes[17..]);
return None;
}
}
pub struct FileinfoPacket {
pub file_id: u128,
pub filename: String,
pub filesize: u128,
pub relative_path: String,
}
impl FileinfoPacket {
pub fn empty() -> FileinfoPacket {
return FileinfoPacket{
file_id: 0,
filename: "".to_string(),
filesize: 0,
relative_path: "".to_string(),
};
}
}
impl Packet for FileinfoPacket {
fn get_type(&self) -> PacketType {
return PacketType::FileInfo;
}
fn as_bytes(&self) -> Vec<u8> {
let mut packet_as_bytes: Vec<u8> = Vec::<u8>::new();
// file id
packet_as_bytes.extend_from_slice(&self.file_id.to_be_bytes());
// filename
let filename_bytes_length: u128 = self.filename.len() as u128;
packet_as_bytes.extend_from_slice(&filename_bytes_length.to_be_bytes());
packet_as_bytes.extend_from_slice(&self.filename.as_bytes());
// filesize
packet_as_bytes.extend_from_slice(&self.filesize.to_be_bytes());
// relative path
let relative_path_bytes_length: u128 = self.relative_path.len() as u128;
packet_as_bytes.extend_from_slice(&relative_path_bytes_length.to_be_bytes());
packet_as_bytes.extend_from_slice(&self.relative_path.as_bytes());
return packet_as_bytes;
}
fn from_bytes(&mut self, packet_bytes: Vec<u8>) -> Option<Error> {
// file id
self.file_id = read_u128_slice(&packet_bytes[0..16]);
// get filename
let filename_length: u128 = read_u128_slice(&packet_bytes[16..32]);
self.filename = read_utf8_string_slice(&packet_bytes[32..(filename_length+32) as usize]);
// filesize
self.filesize = read_u128_slice(&packet_bytes[(filename_length+32) as usize..(filename_length+32+16) as usize]);
// relative path
let rel_path_length: u128 = read_u128_slice(
&packet_bytes[(filename_length+32+16) as usize..(filename_length+32+16+16)as usize]
);
self.relative_path = read_utf8_string_slice(
&packet_bytes[(filename_length+32+16+16) as usize..(filename_length+32+16+16+rel_path_length) as usize]
);
return None;
}
}
pub struct FileDataPacket {
pub file_id: u128,
pub chunk_no: u128,
pub chunk: [u8; CHUNK_SIZE],
}
impl FileDataPacket {
pub fn empty() -> FileDataPacket {
return FileDataPacket {
file_id: 0,
chunk_no: 0,
chunk: [0; CHUNK_SIZE],
}
}
}
impl Packet for FileDataPacket {
fn get_type(&self) -> PacketType {
return PacketType::FileData;
}
fn as_bytes(&self) -> Vec<u8> {
let packet_bytes: Vec<u8> = Vec::<u8>::new();
return packet_bytes;
}
fn from_bytes(&mut self, packet_bytes: Vec<u8>) -> Option<Error> {
return None;
}
}
pub fn send_packet(conn: &mut net::TcpStream, packet: &dyn Packet) -> Result<(), Error> {
let mut payload: Vec<u8> = Vec::<u8>::new();
let packet_bytes: Vec<u8> = packet.as_bytes();
let packet_len: usize = packet_bytes.len();
payload.extend_from_slice(&u128::to_be_bytes(packet_len as u128));
payload.extend_from_slice(&packet_bytes);
match conn.write_all(&payload) {
Ok(()) => {
return Ok(());
}
Err(error) => {
return Err(Error::new(format!("could not write packet to the connection: {}", error).as_str()))
}
}
}
pub fn read_next_packet(conn: &mut net::TcpStream) -> Result<Box<dyn Packet>, Error> {
let mut u128_buf: [u8; 16] = [0; 16];
match conn.read_exact(&mut u128_buf) {
Ok(()) => {}
// Ok(read_bytes) => {
// if read_bytes != 16 {
// return Err(Error::new(format!("read {} initial length bytes instead of 16", read_bytes).as_str()));
// }
// }
Err(error) => {
return Err(Error::new(format!("error while reading initial length bytes: {}", error).as_str()));
}
}
let packet_len: u128 = u128::from_be_bytes(u128_buf);
let mut packet_bytes = vec!(0; packet_len as usize);
// let mut packet_bytes: Vec<u8> = Vec::with_capacity(packet_len as usize);
match conn.read_exact(&mut packet_bytes) {
Ok(()) => {}
// Ok(read_bytes) => {
// if read_bytes != packet_len {
// return Err(
// Error::new(
// format!("read {} bytes of packet contents instead of specified {}",
// read_bytes,
// packet_len).as_str()
// )
// );
// }
// }
Err(error) => {
return Err(Error::new(format!("error while reading packet contents: {}", error).as_str()));
}
}
if packet_bytes.len() < packet_len as usize {
return Err(
Error::new(
format!("read {} packet bytes instead of specified {}", packet_bytes.len(), packet_len).as_str())
);
}
let packet_type_byte: u8 = u8::from_be_bytes([packet_bytes[0]]);
match packet_type_byte {
CONNECTION_SHUTDOWN_PACKET_ID => {
return Ok(Box::new(ConnectionShutdownPacket{}));
}
TEXT_PACKET_ID => {
let mut new_text_packet: TextPacket = TextPacket::empty();
let result = new_text_packet.from_bytes(packet_bytes);
match result {
Some(error) => {
return Err(Error::new(format!("could not construct new text packet: {}", error.text).as_str()));
}
None => {
return Ok(Box::new(new_text_packet));
}
}
}
FILEINFO_PACKET_ID => {
let mut new_fileinfo_packet: FileinfoPacket = FileinfoPacket::empty();
let result = new_fileinfo_packet.from_bytes(packet_bytes);
match result {
Some(error) => {
return Err(Error::new(format!("could not construct new fileinfo packet: {}", error.text).as_str()));
}
None => {
return Ok(Box::new(new_fileinfo_packet));
}
}
}
FILEDATA_PACKET_ID => {
let mut new_filedata_packet: FileDataPacket = FileDataPacket::empty();
let result = new_filedata_packet.from_bytes(packet_bytes);
match result {
Some(error) => {
return Err(Error::new(format!("could not construct new filedata packet: {}", error.text).as_str()));
}
None => {
return Ok(Box::new(new_filedata_packet));
}
}
}
_ => {
return Err(Error::new(format!("invalid packet type ID \"{}\"", packet_type_byte).as_str()));
}
}
}
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