add build-host tftp server
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16
README.md
16
README.md
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@ -116,6 +116,22 @@ Assuming you have nixpkgs checked out in a peer directory of this one,
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Some of the tests require the emulated upstream connection to be running.
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Some of the tests require the emulated upstream connection to be running.
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## Hardware
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How you get the thing onto hardware will vary according to the device,
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but is likely to involve U-Boot and TFTP.
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There is a rudimentary TFTP server bundled with the system which runs
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from the command line, has an allowlist for client connections, and
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follows symlinks, so you can have your device download images direct
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from the `./result` directory without exposing `/nix/store/` to the
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internet or mucking about copying files to `/tftproot`. If the
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permitted device is to be given the IP address 192.168.8.251 you might
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do something like this:
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$ NIX_PATH=nixpkgs=../nixpkgs:$NIX_PATH NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1 nix-build -I liminix-config=./tests/smoke/configuration.nix --arg device "import ./devices/gl-ar750.nix" -A outputs.tftpd -o tftpd
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$ ./tftpd/bin/tufted -a 192.168.8.251 result
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## Troubleshooting
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## Troubleshooting
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@ -39,6 +39,7 @@ let
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# this exists so that you can run "nix-store -q --tree" on it and find
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# this exists so that you can run "nix-store -q --tree" on it and find
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# out what's in the image, which is nice if it's unexpectedly huge
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# out what's in the image, which is nice if it's unexpectedly huge
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manifest = writeText "manifest.json" (builtins.toJSON config.filesystem.contents);
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manifest = writeText "manifest.json" (builtins.toJSON config.filesystem.contents);
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tftpd = nixpkgs.pkgs.buildPackages.tufted;
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};
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};
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in {
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in {
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outputs = outputs // { default = outputs.${device.outputs.default}; };
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outputs = outputs // { default = outputs.${device.outputs.default}; };
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@ -16,6 +16,8 @@ final: prev: {
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dbusSupport = false;
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dbusSupport = false;
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};
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};
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tufted = final.callPackage ./pkgs/tufted {};
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pppoe = final.callPackage ./pkgs/pppoe {};
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pppoe = final.callPackage ./pkgs/pppoe {};
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ppp =
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ppp =
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(prev.ppp.override {
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(prev.ppp.override {
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44
pkgs/tufted/default.nix
Normal file
44
pkgs/tufted/default.nix
Normal file
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@ -0,0 +1,44 @@
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{
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lua5_3
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, stdenv
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, fennel
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, fetchFromGitHub
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, makeWrapper
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} :
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let
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tufty-lua = lua.pkgs.buildLuaPackage {
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pname = "tufty";
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version = "1";
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src = fetchFromGitHub {
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owner = "telent";
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repo = "tufty";
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sha256 = "sha256-m5UEfcCNdG0Ku380cPhu1inNQmSfQJ5NcRIxLohUOh8=";
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rev = "75c6d38713a82f4197f91dcb182a2e34f255bf7c";
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};
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buildPhase = ":";
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installPhase = ''
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mkdir -p "$out/share/lua/${lua5_3.luaversion}"
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cp src/*.lua "$out/share/lua/${lua5_3.luaversion}/"
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'';
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};
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lua = lua5_3.withPackages (ps: with ps; [
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tufty-lua luasocket luaposix
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]);
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fennel_ = (fennel.override { inherit lua; });
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in stdenv.mkDerivation {
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pname = "tufted";
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version = "1";
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phases = [ "unpackPhase" "installPhase" ];
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buildInputs = [ lua fennel_ ];
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nativeBuildInputs = [ makeWrapper ];
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src = ./.;
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installPhase = ''
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mkdir -p $out/lib
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cp tufted.fnl $out/lib
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makeWrapper ${fennel_}/bin/fennel \
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$out/bin/tufted \
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--add-flags "--add-fennel-path $out/lib/?.fnl" \
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--add-flags "--add-package-path $out/lib/?.lua" \
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--add-flags "$out/lib/tufted.fnl"
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'';
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}
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51
pkgs/tufted/tufted.fnl
Normal file
51
pkgs/tufted/tufted.fnl
Normal file
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@ -0,0 +1,51 @@
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(local tftp (require :tftp))
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(local { : realpath} (require :posix.stdlib))
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(local { : view } (require :fennel))
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(local options
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(match arg
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["-a" ip-address dir]
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{ :allow ip-address :base-directory (realpath dir)}
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[dir]
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{ :allow nil :base-directory (realpath dir)}
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[]
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(error "missing command line parameters")
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))
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(print (.. "TFTP serving from " options.base-directory))
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(fn merge-pathname [directory filename]
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(if (directory:match "/$")
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(.. directory filename)
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(.. directory "/" filename)))
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(->
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(tftp:listen
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(fn [file host port]
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(if (or (not options.allow) (= host options.allow))
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(let [pathname (merge-pathname options.base-directory file)
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f (io.open pathname "rb")
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size (f:seek "end")]
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(f:seek "set" 0)
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(var eof? false)
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(values
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(fn handler [reqlen]
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(let [bytes (f:read reqlen)]
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(if eof?
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false
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bytes
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(values true bytes)
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(do
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;; if the file length is divisible by the block
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;; length, need to send an empty block at eof
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(set eof? true)
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(values true "")))))
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size))
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(error "host not allowed")))
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nil
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["*"]
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69)
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(os.exit))
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