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551e4aee91
It turns out many PXE firmwares request tsize to size the download buffer, and will refuse to download at all if the server cannot provide a tsize. This unfortunately breaks API compatibility to add a size parameter, but I think it's an unfortunate necessity to make this work.
60 lines
1.7 KiB
Go
60 lines
1.7 KiB
Go
// Copyright 2016 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tftp
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"os"
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"path/filepath"
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)
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// FilesystemHandler returns a Handler that serves files in root.
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func FilesystemHandler(root string) (Handler, error) {
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root, err := filepath.Abs(root)
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if err != nil {
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return nil, err
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}
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root = filepath.ToSlash(root)
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return func(path string, addr net.Addr) (io.ReadCloser, int64, error) {
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// Join with a root, which gets rid of directory traversal
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// attempts. Then we join that canonicalized path with the
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// actual root, which resolves to the actual on-disk file to
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// serve.
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path = filepath.Join("/", path)
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path = filepath.FromSlash(filepath.Join(root, path))
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st, err := os.Stat(path)
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if err != nil {
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return nil, 0, err
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}
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if !st.Mode().IsRegular() {
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return nil, 0, fmt.Errorf("requested path %q is not a file", path)
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}
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f, err := os.Open(path)
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return f, st.Size(), err
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}, nil
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}
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// ConstantHandler returns a Handler that serves bs for all requested paths.
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func ConstantHandler(bs []byte) Handler {
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return func(path string, addr net.Addr) (io.ReadCloser, int64, error) {
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return ioutil.NopCloser(bytes.NewBuffer(bs)), int64(len(bs)), nil
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}
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}
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