sendfile-cli

Overview

• Send files securely via TCP/TLS 1.3 in local network (no Internet needed)
• Automatically generate TLS private/public keys pair for each connection

Process

• Each receiver runs a TCP server to listen for connections from sender
• Initiate state machines for server and client, communicate using a custom protocol
• Custom protocol for TCP packets:

    <package> := <package_type> <data-length> <data>?
    <package_type> := Send | Accept | Reject | StartFile | EndFile | FileData | Finish
    <data-length> := NUMBER
    <data> := FileInfo[] | Byte[]

• Length
  • <package_type>: 1 byte (number range from 0..2^8)
  • : 2 bytes (number range from 0..2^16)
  • : byte array (maximum 61 bytes)

State machines (mermaid)

Receiver (or server)

stateDiagram-v2
    [*] --> Init
    Init --> InternalAnswer: Send?
    InternalAnswer --> Finish: Reject!
    InternalAnswer --> WaitForFile: Accept!
    WaitForFile --> StartReceivingFile: StartFile?
    StartReceivingFile --> ReceiveFileData: FileData?
    ReceiveFileData --> ReceiveFileData: FileData?
    ReceiveFileData --> EndReceivingFile: EndFile?
    EndReceivingFile --> StartReceivingFile: StartFile?
    EndReceivingFile --> Finish: Finish?

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Sender (or client)

stateDiagram-v2
    [*] --> Init
    Init --> WaitForResponse: Send!
    WaitForResponse --> Finish: Reject?
    WaitForResponse --> Accepted: Accept?
    Accepted --> StartSendingFile: StartFile!
    StartSendingFile --> SendFileData: FileData!
    SendFileData --> SendFileData: FileData!
    SendFileData --> EndSendingFile: EndFile!
    EndSendingFile --> StartSendingFile: StartFile!
    EndSendingFile --> Finish: Finish!

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Run examples

• Run server

  RUST_LOG=debug cargo run -- -s 7878
  

• Run client

  RUST_LOG=debug cargo run -- -c 127.0.0.1:7878 -f test-data/file1.txt -f test-data/file2.txt