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/*
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ddtu - digital data transferring utility
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Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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*/
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use std::net;
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use std::io::Write;
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use std::io::Read;
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use crate::util::error::Error;
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use crate::util::buf_read::{read_u128_slice_be, read_utf8_string_slice};
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use crate::protocol::specs::*;
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use crate::fsys::file::ChunkedFile;
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pub fn send_packet(conn: &mut net::TcpStream, packet: &dyn Packet) -> Result<(), Error> {
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let mut payload: Vec<u8> = Vec::<u8>::new();
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let packet_bytes: Vec<u8> = packet.as_bytes();
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let packet_len: usize = packet_bytes.len();
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payload.extend_from_slice(&(packet_len as u128).to_be_bytes());
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payload.extend_from_slice(&packet_bytes);
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match conn.write_all(&payload) {
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Ok(()) => {
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return Ok(());
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}
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Err(error) => {
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return Err(Error::new(format!("could not write packet to the connection: {}", error).as_str()))
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}
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}
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}
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pub fn read_next_packet(conn: &mut net::TcpStream) -> Result<Box<dyn Packet>, Error> {
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let mut u128_buf: [u8; 16] = [0; 16];
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match conn.read_exact(&mut u128_buf) {
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Ok(()) => {}
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Err(error) => {
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return Err(Error::new(format!("error while reading initial length bytes: {}", error).as_str()));
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}
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}
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let packet_len: u128 = u128::from_be_bytes(u128_buf);
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let mut packet_bytes: Vec<u8> = vec!(0; packet_len as usize);
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match conn.read_exact(&mut packet_bytes) {
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Ok(()) => {}
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Err(error) => {
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return Err(Error::new(format!("error while reading packet contents: {}", error).as_str()));
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}
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}
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if packet_bytes.len() < packet_len as usize {
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return Err(
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Error::new(
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format!("read {} packet bytes instead of specified {}", packet_bytes.len(), packet_len).as_str())
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);
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}
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let packet_type_byte: u8 = u8::from_be_bytes([packet_bytes[0]]);
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match packet_type_byte {
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CONNECTION_SHUTDOWN_PACKET_ID => {
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return Ok(Box::new(ConnectionShutdown{}));
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}
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TEXT_PACKET_ID => {
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let mut new_text_packet: Text = Text::empty();
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let result = new_text_packet.from_bytes(packet_bytes);
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match result {
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Some(error) => {
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return Err(Error::new(format!("could not construct new text packet: {}", error.text).as_str()));
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}
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None => {
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return Ok(Box::new(new_text_packet));
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}
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}
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}
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FILEINFO_PACKET_ID => {
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let mut new_fileinfo_packet: FileInfo = FileInfo::empty();
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let result = new_fileinfo_packet.from_bytes(packet_bytes);
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match result {
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Some(error) => {
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return Err(Error::new(format!("could not construct new fileinfo packet: {}", error.text).as_str()));
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}
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None => {
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return Ok(Box::new(new_fileinfo_packet));
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}
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}
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}
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FILEDATA_PACKET_ID => {
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let mut new_filedata_packet: FileData = FileData::empty();
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let result = new_filedata_packet.from_bytes(packet_bytes);
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match result {
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Some(error) => {
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return Err(Error::new(format!("could not construct new filedata packet: {}", error.text).as_str()));
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}
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None => {
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return Ok(Box::new(new_filedata_packet));
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}
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}
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}
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_ => {
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return Err(Error::new(format!("invalid packet type ID \"{}\"", packet_type_byte).as_str()));
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}
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}
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}
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pub struct Text {
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pub text: String,
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}
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impl Text {
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pub fn empty() -> Text {
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return Text{
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text: "".to_string(),
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};
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}
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pub fn new(txt: &str) -> Text {
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return Text {
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text: txt.to_string(),
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}
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}
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}
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impl Packet for Text {
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fn get_type(&self) -> PacketType {
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return PacketType::TextData;
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}
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fn as_bytes(&self) -> Vec<u8> {
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let mut packet_bytes: Vec<u8> = Vec::<u8>::new();
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packet_bytes.extend_from_slice(&TEXT_PACKET_ID.to_be_bytes());
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let text_length: u128 = self.text.len() as u128;
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packet_bytes.extend_from_slice(&text_length.to_be_bytes());
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packet_bytes.extend_from_slice(&self.text.as_bytes());
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return packet_bytes;
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}
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fn from_bytes(&mut self, packet_bytes: Vec<u8>) -> Option<Error> {
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if packet_bytes.len() < 18 {
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return Some(
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Error::new(format!("{} bytes is too small for a text packet to be valid", packet_bytes.len()).as_str()
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));
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}
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// retrieve and check for packet type byte
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match packet_bytes[0].to_be() {
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TEXT_PACKET_ID => {}
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_ => {
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return Some(Error::new("packet type is not of a text packet"));
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}
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}
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// get text length
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let text_length: u128 = read_u128_slice_be(&packet_bytes[1..17]);
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if text_length as usize > packet_bytes[17..].len() {
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return Some(
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Error::new(
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format!(
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"text length ({}) is bigger than provided packet bytes length ({})",
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text_length,
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packet_bytes[16..].len()
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).as_str()
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)
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);
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}
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// extract text
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self.text = read_utf8_string_slice(&packet_bytes[17..]);
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return None;
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}
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}
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pub struct FileInfo {
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pub file_id: u128,
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pub filename: String,
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pub filesize: u128,
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pub relative_path: String,
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}
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impl FileInfo {
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pub fn empty() -> FileInfo {
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return FileInfo{
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file_id: 0,
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filename: String::new(),
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filesize: 0,
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relative_path: String::new(),
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};
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}
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pub fn new(file: &ChunkedFile, file_id: u128, rel_path: String) -> Result<FileInfo, Error> {
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let mut new_fileinfo_packet: FileInfo = FileInfo::empty();
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// id
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new_fileinfo_packet.file_id = file_id;
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//filename
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match file.path.file_name() {
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Some(filename) => {
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match filename.to_owned().into_string() {
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Ok(filename_string) => {
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new_fileinfo_packet.filename = filename_string;
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}
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Err(filename_os_string) => {
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return Err(
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Error::new(format!("could not convert \'{:?}\' (OsString) to String", filename_os_string).as_str())
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);
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}
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}
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}
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None => {
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return Err(
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Error::new(format!("could not get filename from \'{}\'", file.path.display()).as_str())
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);
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}
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}
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// size
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new_fileinfo_packet.filesize = file.size;
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// rel path
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new_fileinfo_packet.relative_path = rel_path;
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return Ok(new_fileinfo_packet);
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}
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}
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impl Packet for FileInfo {
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fn get_type(&self) -> PacketType {
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return PacketType::FileInfo;
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}
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fn as_bytes(&self) -> Vec<u8> {
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let mut packet_bytes: Vec<u8> = Vec::<u8>::new();
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packet_bytes.extend_from_slice(&FILEINFO_PACKET_ID.to_be_bytes());
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// file id
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packet_bytes.extend_from_slice(&self.file_id.to_be_bytes());
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// filename
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let filename_bytes_length: u128 = self.filename.len() as u128;
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packet_bytes.extend_from_slice(&filename_bytes_length.to_be_bytes());
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packet_bytes.extend_from_slice(&self.filename.as_bytes());
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// filesize
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packet_bytes.extend_from_slice(&self.filesize.to_be_bytes());
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// relative path
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let relative_path_bytes_length: u128 = self.relative_path.len() as u128;
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packet_bytes.extend_from_slice(&relative_path_bytes_length.to_be_bytes());
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packet_bytes.extend_from_slice(&self.relative_path.as_bytes());
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return packet_bytes;
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}
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fn from_bytes(&mut self, packet_bytes: Vec<u8>) -> Option<Error> {
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if packet_bytes.len() < 16+16+16+16+1+1 {
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return Some(
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Error::new(format!("{} bytes is too small for a fileinfo packet to be valid", packet_bytes.len()).as_str()
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));
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}
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// file id
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self.file_id = read_u128_slice_be(&packet_bytes[0..16]);
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// get filename
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let filename_length: u128 = read_u128_slice_be(&packet_bytes[16..32]);
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self.filename = read_utf8_string_slice(&packet_bytes[32..(filename_length+32) as usize]);
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// filesize
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self.filesize = read_u128_slice_be(&packet_bytes[(filename_length+32) as usize..(filename_length+32+16) as usize]);
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// relative path
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let rel_path_length: u128 = read_u128_slice_be(
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&packet_bytes[(filename_length+32+16) as usize..(filename_length+32+16+16)as usize]
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);
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self.relative_path = read_utf8_string_slice(
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&packet_bytes[(filename_length+32+16+16) as usize..(filename_length+32+16+16+rel_path_length) as usize]
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);
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return None;
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}
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}
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pub struct FileData {
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pub file_id: u128,
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pub chunk_no: u128,
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pub chunk: [u8; CHUNK_SIZE],
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}
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impl FileData {
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pub fn empty() -> FileData {
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return FileData {
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file_id: 0,
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chunk_no: 0,
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chunk: [0; CHUNK_SIZE],
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}
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}
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}
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impl Packet for FileData {
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fn get_type(&self) -> PacketType {
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return PacketType::FileData;
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}
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fn as_bytes(&self) -> Vec<u8> {
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let mut packet_bytes: Vec<u8> = Vec::<u8>::new();
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packet_bytes.extend_from_slice(&FILEDATA_PACKET_ID.to_be_bytes());
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// file id
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packet_bytes.extend_from_slice(&self.file_id.to_be_bytes());
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// chunk number
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packet_bytes.extend_from_slice(&self.chunk_no.to_be_bytes());
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// chunk
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packet_bytes.extend_from_slice(&self.chunk.len().to_be_bytes());
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packet_bytes.extend_from_slice(&self.chunk);
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return packet_bytes;
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}
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fn from_bytes(&mut self, packet_bytes: Vec<u8>) -> Option<Error> {
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if packet_bytes.len() < 16+16+16+1 {
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return Some(
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Error::new(format!("{} bytes is too small for a fileinfo packet to be valid", packet_bytes.len()).as_str()
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));
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}
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// file id
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self.file_id = read_u128_slice_be(&packet_bytes[0..16]);
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// chunk number
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self.chunk_no = read_u128_slice_be(&packet_bytes[16..32]);
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// chunk bytes
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let chunk_length = read_u128_slice_be(&packet_bytes[32..48]);
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for i in 48..(48+chunk_length) as usize {
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self.chunk[i-48] = packet_bytes[i].to_be();
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}
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return None;
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}
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}
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pub struct ConnectionShutdown {}
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impl Packet for ConnectionShutdown {
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fn get_type(&self) -> PacketType {
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return PacketType::ConnectionShutdown;
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}
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fn as_bytes(&self) -> Vec<u8> {
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return vec!(CONNECTION_SHUTDOWN_PACKET_ID.to_be_bytes()[0]);
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}
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fn from_bytes(&mut self, _packet_bytes: Vec<u8>) -> Option<Error> {
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return None;
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}
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}
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pub struct Handshake {
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pub protocol_version: u8,
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pub encryption_type: u8,
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pub encryption_key: Vec<u8>,
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}
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impl Handshake {
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pub fn empty() -> Handshake {
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return Handshake{
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protocol_version: PROTOCOL_LATEST_VERSION,
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encryption_type: ENCRYPTION_NO_ENCRYPTION,
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encryption_key: vec!(0, 0, 0, 0, 0, 0, 0, 0),
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};
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}
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}
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|
|
impl Packet for Handshake {
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fn get_type(&self) -> PacketType {
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return PacketType::Handshake;
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|
}
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|
|
fn as_bytes(&self) -> Vec<u8> {
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let mut packet_bytes: Vec<u8> = Vec::<u8>::new();
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packet_bytes.extend_from_slice(&HANDSHAKE_PACKET_ID.to_be_bytes());
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|
|
// protocol version
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|
|
packet_bytes.extend_from_slice(&PROTOCOL_LATEST_VERSION.to_be_bytes());
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|
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|
|
// encryption type
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|
|
packet_bytes.extend_from_slice(&self.encryption_type.to_be_bytes());
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|
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|
|
// encryption key
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|
|
packet_bytes.extend_from_slice(&(self.encryption_key.len() as u128).to_be_bytes());
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|
|
packet_bytes.extend_from_slice(&self.encryption_key);
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|
|
|
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|
|
return packet_bytes;
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|
|
|
}
|
|
|
|
|
|
|
|
fn from_bytes(&mut self, packet_bytes: Vec<u8>) -> Option<Error> {
|
|
|
|
if packet_bytes.len() < 1+1+1+16+1 {
|
|
|
|
return Some(
|
|
|
|
Error::new(format!("{} bytes is too small for a handshake packet to be valid", packet_bytes.len()).as_str())
|
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
// protocol version
|
|
|
|
self.protocol_version = packet_bytes[0].to_be();
|
|
|
|
|
|
|
|
// encryption type
|
|
|
|
self.encryption_type = packet_bytes[1].to_be();
|
|
|
|
|
|
|
|
// key
|
|
|
|
let key_len: u128 = read_u128_slice_be(&packet_bytes[1..17]);
|
|
|
|
for i in 17..(17+key_len) as usize {
|
|
|
|
self.encryption_key[i-17] = packet_bytes[i].to_be();
|
|
|
|
}
|
|
|
|
|
|
|
|
return None;
|
|
|
|
}
|
|
|
|
}
|