feat: initial commit with build system

flake.nix

@@ -3,78 +3,101 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-24.11";
+
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
     };
     crane.url = "github:ipetkov/crane";
     flake-utils.url = "github:numtide/flake-utils";
-    fenix = {
-      url = "github:nix-community/fenix";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
 
     libpcap-src = {
       url = "git+https://github.com/the-tcpdump-group/libpcap";
       flake = false;
     };
-    libnl = {
+    libnl-src = {
       url = "git+https://github.com/thom311/libnl";
       flake = false;
     };
-    winpcap = {
+    winpcap-libs = {
       url = "https://www.winpcap.org/install/bin/WpdPack_4_1_2.zip";
       flake = false;
     };
-
-    #freebsd = {
-    #  url =
-    #    "https://download.freebsd.org/releases/ISO-IMAGES/14.1/FreeBSD-14.1-RELEASE-amd64-dvd1.iso";
-    #  flake = false;
-    #};
+    winpcap-installer = {
+      url = "https://www.winpcap.org/install/bin/WinPcap_4_1_3.exe";
+      flake = false;
+    };
+    freebsd-libs-packed = {
+      url = "https://download.freebsd.org/releases/amd64/14.1-RELEASE/base.txz";
+      flake = false;
+    };
+    # command for later:
+    # echo '000007: 09' | xxd -r - target/x86_64-unknown-freebsd/debug/sparse-beacon
   };
 
-  outputs = { self, nixpkgs, flake-utils, crane, fenix, rust-overlay
-    , libpcap-src, libnl, winpcap }:
-    flake-utils.lib.eachDefaultSystem (system:
+  outputs = { self, nixpkgs, flake-utils, crane, rust-overlay, libpcap-src
+    , libnl-src, winpcap-libs, winpcap-installer, freebsd-libs-packed }:
+    flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
       let
         pkgs = import nixpkgs {
           inherit system;
-          overlays = [ (import rust-overlay) fenix.overlays.default ];
-          config.allowUnfree = true;
+          overlays = [ (import rust-overlay) ];
         };
 
-        linuxBuildTools = with pkgs; [
-          autoconf
-          automake
-          bison
-          cmake
-          flex
-          libtool
-          libpcap
-          musl
-          pkg-config
-        ];
+        system-libs = import ./system-libs.nix {
+          inherit pkgs libpcap-src winpcap-installer freebsd-libs-packed;
+        };
+        inherit (system-libs)
+          bsd-toolchain winpcap-drivers freebsd-libs libnl libpcap-linux
+          libpcap-freebsd;
 
-        windowsBuildTools = linuxBuildTools ++ (with pkgs; [
+        buildTools = with pkgs; [
+          mold
+          lld
+          zig
+          clang
+          glibc
+
+          pkgsCross.x86_64-freebsd.buildPackages.clang
           pkgsCross.mingwW64.stdenv.cc
           pkgsCross.mingwW64.windows.pthreads
-        ]);
+        ];
 
-        toolchain =
-          pkgs.pkgsMusl.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+        devShellTools = with pkgs; [ rust-analyzer ];
 
-        craneLib = (crane.mkLib pkgs).overrideToolchain toolchain;
+        craneLib = (crane.mkLib pkgs).overrideToolchain (p:
+          p.rust-bin.stable.latest.default.override {
+            targets = [
+              "x86_64-unknown-linux-gnu"
+              "x86_64-unknown-linux-musl"
+              "x86_64-pc-windows-gnu"
+              "x86_64-unknown-freebsd"
+            ];
+          });
+
+        patch-elf = header: drv: path:
+          pkgs.stdenv.mkDerivation {
+            name = "elf-patch-${header}";
+
+            buildInputs = with pkgs; [ vim ];
+          };
+        patch-freebsd-elf = patch-elf 9;
       in {
-        devShells.default = craneLib.devShell {
-          name = "sparse";
+        devShells = {
+          default = craneLib.devShell {
+            name = "sparse-default";
 
-          buildInputs = windowsBuildTools
-            ++ (with pkgs; [ rust-analyzer packer ]);
+            packages = buildTools ++ devShellTools;
 
-          SPARSE_BUILD_WINPCAP = "${winpcap}/Lib";
-          SPARSE_BUILD_LIBPCAP = "${libpcap-src}";
-          SPARSE_BUILD_LIBNL = "${libnl}";
+            SPARSE_BUILD_WINPCAP_LIBS = "${winpcap-libs}/Lib";
+            SPARSE_BUILD_WINPCAP_DRIVERS = "${winpcap-drivers}/npf.sys";
+            SPARSE_BUILD_LIBPCAP = libpcap-src;
+            SPARSE_BUILD_LIBNL = libnl-src;
+
+            FREEBSD_LIBS = freebsd-libs;
+
+            RUSTFLAGS = "-Ctarget-feature=+crt-static";
+          };
         };
       });
 }