mirror of
https://github.com/ethereum/go-ethereum.git
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70 lines
2 KiB
Go
70 lines
2 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package common
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import (
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"fmt"
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"os"
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"path/filepath"
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)
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// FileExist checks if a file exists at filePath.
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func FileExist(filePath string) bool {
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_, err := os.Stat(filePath)
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if err != nil && os.IsNotExist(err) {
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return false
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}
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return true
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}
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// AbsolutePath returns datadir + filename, or filename if it is absolute.
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func AbsolutePath(datadir string, filename string) string {
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if filepath.IsAbs(filename) {
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return filename
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}
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return filepath.Join(datadir, filename)
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}
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// VerifyPath sanitizes the path to avoid Path Traversal vulnerability
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func VerifyPath(path string) (string, error) {
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c := filepath.Clean(path)
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r, err := filepath.EvalSymlinks(c)
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if err != nil {
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return c, fmt.Errorf("unsafe or invalid path specified: %s", path)
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} else {
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return r, nil
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}
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}
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// VerifyCrasher sanitizes the path to avoid Path Traversal vulnerability and reads the file from that path, returning its content
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func VerifyCrasher(crasher string) []byte {
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canonicalPath, err := VerifyPath(crasher)
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if err != nil {
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fmt.Println("path not verified: " + err.Error())
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return nil
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}
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data, err := os.ReadFile(canonicalPath)
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if err != nil {
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fmt.Fprintf(os.Stderr, "error loading crasher %v: %v", canonicalPath, err)
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os.Exit(1)
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}
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return data
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}
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