commit 46a1ec0a1656dc9bf27d892827f298f0e2cd8b88
Author: Nilstrieb <48135649+Nilstrieb@users.noreply.github.com>
Date:   Thu Sep 7 21:25:03 2023 +0200

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..6cc047a
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,82 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "byteorder"
+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "getrandom"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.147"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "tls"
+version = "0.1.0"
+dependencies = [
+ "byteorder",
+ "rand",
+]
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..d6a4ba5
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "tls"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+byteorder = "1.4.3"
+rand = "0.8.5"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..08b9d09
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# transport layer security
+
+except with probably a lot less of that security part. lots of transport and lots of layers though.
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..78b58bd
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1692799911,
+        "narHash": "sha256-3eihraek4qL744EvQXsK1Ha6C3CR7nnT8X2qWap4RNk=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "f9e7cf818399d17d347f847525c5a5a8032e4e44",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1693985761,
+        "narHash": "sha256-K5b+7j7Tt3+AqbWkcw+wMeqOAWyCD1MH26FPZyWXpdo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "0bffda19b8af722f8069d09d8b6a24594c80b352",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..059d097
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,43 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ... }: flake-utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = import nixpkgs { inherit system; };
+    in
+    {
+      devShells.default = pkgs.mkShell {
+        buildInputs = with pkgs; [
+          llvmPackages_16.clang
+          llvmPackages_16.bintools
+          llvmPackages_16.libllvm
+          rustup
+          pkg-config
+          sqlite
+          # openssl Explicitly no openssl!
+        ];
+        # https://github.com/rust-lang/rust-bindgen#environment-variables
+        LIBCLANG_PATH = pkgs.lib.makeLibraryPath [ pkgs.llvmPackages_latest.libclang.lib ];
+        shellHook = ''
+          export PATH=$PATH:''${CARGO_HOME:-~/.cargo}/bin
+          export PATH=$PATH:''${RUSTUP_HOME:-~/.rustup}/toolchains/$RUSTC_VERSION-x86_64-unknown-linux-gnu/bin/
+        '';
+        # Add glibc, clang, glib and other headers to bindgen search path
+        BINDGEN_EXTRA_CLANG_ARGS =
+          (builtins.map (a: ''-I"${a}/include"'') [
+            pkgs.glibc.dev
+          ])
+          # Includes with special directory paths
+          ++ [
+            ''-I"${pkgs.llvmPackages_latest.libclang.lib}/lib/clang/${pkgs.llvmPackages_latest.libclang.version}/include"''
+            ''-I"${pkgs.glib.dev}/include/glib-2.0"''
+            ''-I${pkgs.glib.out}/lib/glib-2.0/include/''
+          ];
+        packages = (with pkgs; [
+        ]);
+      };
+    });
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..171f0b2
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,65 @@
+pub mod proto;
+
+use std::{
+    io::{self, Read},
+    net::{TcpStream, ToSocketAddrs},
+};
+
+type Result<T, E = Error> = std::result::Result<T, E>;
+
+pub struct ClientConnection {}
+
+impl ClientConnection {
+    pub fn establish(host: impl ToSocketAddrs) -> Result<Self> {
+        let _setup = ClientSetupConnection::establish(host)?;
+
+        todo!()
+    }
+}
+
+struct ClientSetupConnection {}
+
+impl ClientSetupConnection {
+    fn establish(host: impl ToSocketAddrs) -> Result<Self> {
+        let mut stream = TcpStream::connect(host)?;
+        let handshake = proto::Handshake::ClientHello {
+            legacy_version: proto::LEGACY_VERSION,
+            random: rand::random(),
+            legacy_session_id: 0,
+            cipher_suites: [0; 2],
+            legacy_compressions_methods: 0,
+            extensions: 0,
+        };
+        proto::write_handshake(&mut stream, handshake)?;
+
+        let res = proto::read_handshake(&mut stream)?;
+        dbg!(res);
+
+        todo!()
+    }
+}
+
+#[derive(Debug)]
+pub struct Error {
+    kind: ErrorKind,
+}
+
+#[derive(Debug)]
+pub enum ErrorKind {
+    InvalidHandshake(u8),
+    Io(io::Error),
+}
+
+impl From<io::Error> for Error {
+    fn from(value: io::Error) -> Self {
+        Self {
+            kind: ErrorKind::Io(value),
+        }
+    }
+}
+
+impl From<ErrorKind> for Error {
+    fn from(value: ErrorKind) -> Self {
+        Self { kind: value }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..9c07119
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,4 @@
+// An example program that makes a shitty HTTP/1.1 request.
+fn main() {
+    tls::ClientConnection::establish(("nilstrieb.dev", 443)).unwrap();
+}
\ No newline at end of file
diff --git a/src/proto.rs b/src/proto.rs
new file mode 100644
index 0000000..c900c0e
--- /dev/null
+++ b/src/proto.rs
@@ -0,0 +1,143 @@
+use std::io::{self, Read, Write};
+
+use byteorder::{BigEndian as B, ReadBytesExt, WriteBytesExt};
+
+use crate::ErrorKind;
+
+// https://datatracker.ietf.org/doc/html/rfc8446#section-4
+macro_rules! handshake {
+    ($(#[$meta:meta])* pub enum Handshake {
+        $(
+            $KindName:ident {
+                $(
+                    $field_name:ident : $field_ty:ty,
+                )*
+            } = $discriminant:expr,
+        )*
+    }) => {
+        $(#[$meta])*
+        pub enum Handshake {
+            $(
+                $KindName {
+                    $(
+                        $field_name: $field_ty,
+                    )*
+                },
+            )*
+        }
+
+        impl Handshake {
+            fn write(self, w: &mut impl Write) -> io::Result<()> {
+                match self {
+                    $(
+                        Self::$KindName {
+                            $( $field_name, )*
+                        } => {
+                            $(
+                                Value::write($field_name, &mut *w)?;
+                            )*
+                            Ok(())
+                        }
+                    )*
+                }
+            }
+
+            fn read(r: &mut impl Read) -> crate::Result<Self> {
+                let kind = r.read_u8()?;
+                match kind {
+                    $(
+                        $discriminant => {
+                            let ( $( $field_name ),* ) = ($( { discard!($field_name); Value::read(&mut *r)? } ),*);
+
+                            Ok(Self::$KindName {
+                                $(
+                                    $field_name,
+                                )*
+                            })
+                        },
+                    )*
+
+                    _ => Err(ErrorKind::InvalidHandshake(kind).into()),
+                }
+            }
+        }
+    };
+}
+
+handshake! {
+    #[derive(Debug, Clone, Copy)]
+    pub enum Handshake {
+        // https://datatracker.ietf.org/doc/html/rfc8446#section-4.1.2
+        ClientHello {
+            legacy_version: u16,
+            random: [u8; 32],
+            legacy_session_id: u8,
+            cipher_suites: [u8; 2],
+            legacy_compressions_methods: u8,
+            extensions: u16,
+        } = 1,
+        ServerHello {} = 2,
+        NewSessionTicket {} = 4,
+        EndOfEarlyData {} = 5,
+        EncryptedExtensions {} = 8,
+        Certificate {} = 11,
+        CertificateRequest {} = 13,
+        CertificateVerify {} = 15,
+        Finished {} = 20,
+        KeyUpdate {} = 24,
+        MessageHash {} = 254,
+    }
+}
+
+pub const LEGACY_VERSION: u16 = 0x0303; // TLS v1.2
+
+pub fn write_handshake<W: Write>(w: &mut W, handshake: Handshake) -> io::Result<()> {
+    handshake.write(w)
+}
+
+pub fn read_handshake<R: Read>(r: &mut R) -> crate::Result<Handshake> {
+    Handshake::read(r)
+}
+
+trait Value: Sized + Copy {
+    fn write<W: io::Write>(self, w: W) -> io::Result<()>;
+    fn read<R: io::Read>(r: R) -> io::Result<Self>;
+}
+
+impl<V: Value, const N: usize> Value for [V; N] {
+    fn write<W: io::Write>(self, mut w: W) -> io::Result<()> {
+        self.into_iter().map(|v| Value::write(v, &mut w)).collect()
+    }
+    fn read<R: io::Read>(mut r: R) -> io::Result<Self> {
+        // ugly :(
+        let mut values = [None; N];
+        for i in 0..N {
+            let value = V::read(&mut r)?;
+            values[i] = Some(value);
+        }
+        Ok(values.map(Option::unwrap))
+    }
+}
+
+impl Value for u8 {
+    fn write<W: io::Write>(self, mut w: W) -> io::Result<()> {
+        w.write_u8(self)
+    }
+    fn read<R: io::Read>(mut r: R) -> io::Result<Self> {
+        r.read_u8()
+    }
+}
+
+impl Value for u16 {
+    fn write<W: io::Write>(self, mut w: W) -> io::Result<()> {
+        w.write_u16::<B>(self)
+    }
+    fn read<R: io::Read>(mut r: R) -> io::Result<Self> {
+        r.read_u16::<B>()
+    }
+}
+
+macro_rules! discard {
+    ($($tt:tt)*) => {};
+}
+use discard;