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--- /dev/null
+package main
+
+import (
+ "crypto/sha1"
+ "encoding/hex"
+ "fmt"
+ "github.com/frostschutz/go-fibmap"
+ "github.com/pborman/options"
+ sys "golang.org/x/sys/unix"
+ "io"
+ "log"
+ "net"
+ "os"
+ "path/filepath"
+ "strconv"
+)
+
+// Constants
+const (
+ // Magic number used for BTRFS
+ // Sourced from https://github.com/torvalds/linux/blob/master/include/uapi/linux/magic.h
+ // Currently only this CoW enabled file systems is supported by shx
+ // ZFS on Linux support will potentially follow
+ BTRFS_SUPER_MAGIC int64 = 0x9123683E
+)
+
+// Variables
+var (
+ logFileName string = "/tmp/shx.log"
+ // CLI options struct
+ opts = struct {
+ Help options.Help `getopt:"--help Display this help page"`
+ RefFileName string `getopt:"--file -f=NAME Absolute path of the file to check against"`
+ WorkingDir string `getopt:"--directory -d=PATH Absolute path of the directory to scan"`
+ }{WorkingDir: "/"}
+)
+
+// Returns an array of file extents for a specified file
+func getFileExtents(FileName string) (extents []fibmap.Extent, err error) {
+ // File descriptor for 'FileName' (pointer to os.File struct)
+ fd, err := os.Open(FileName)
+ if err != nil {
+ log.Printf("Failed to retrieve file descriptor for: %s", FileName)
+ return nil, fmt.Errorf("shx: Failed to open file!\nError: %s\n", err)
+ }
+ defer func(file *os.File) {
+ err := file.Close()
+ if err != nil {
+ log.Printf("Failed to close file!\nError: %s\n", err)
+ }
+ }(fd)
+
+ ffmap := fibmap.NewFibmapFile(fd)
+ blockSize, errno := ffmap.Figetbsz()
+ if errno != 0 {
+ log.Printf("%v\n", errno)
+ return nil, fmt.Errorf("shx: Failed to get block size!\nError Code: %v\n", errno)
+ }
+
+ fileStat, err := fd.Stat()
+ if err != nil {
+ log.Printf("%v\n", err)
+ return nil, fmt.Errorf("shx: Failed to get file stats!\nError: %s\n", err)
+ }
+
+ fileByteSize := fileStat.Size()
+ dataBlocks := uint32((fileByteSize-1)/int64(blockSize)) + 1
+
+ // Get all extents for the specified file
+ extents, errno = ffmap.Fiemap(dataBlocks)
+ if errno != 0 {
+ log.Printf("%v\n", errno)
+ return nil, fmt.Errorf("shx: Failed to get extents!\nError Code: %v\n", errno)
+ }
+
+ return
+}
+
+// Returns a SHA1 from the sum of each physical offset + length for all found extents
+func extentsSHA1(extents []fibmap.Extent) (extentsSHA1 string, err error) {
+ var sum uint64
+ hash := sha1.New()
+
+ for _, extent := range extents {
+ sum += extent.Physical>>12 + extent.Length>>12
+ }
+
+ _, err = io.WriteString(hash, strconv.FormatUint(sum, 10))
+ if err != nil {
+ log.Printf("%v\n", err)
+ return extentsSHA1, fmt.Errorf("shx: Could not generate file extents' SHA1!\nError: %s\n", err)
+ }
+
+ return hex.EncodeToString(hash.Sum(nil)), nil
+}
+
+// Walk the target directory
+func walkDir(workingDir string, searchSHA1 string) (err error) {
+ err = filepath.Walk(workingDir, func(path string, info os.FileInfo, err error) error {
+ err = checkFS(path)
+ if err != nil {
+ return filepath.SkipDir
+ }
+
+ if err != nil {
+ fmt.Println(err)
+ return err
+ }
+
+ if isNotADirectory := info.IsDir(); isNotADirectory == false {
+ fileExtents, _ := getFileExtents(path)
+ extSHA1, _ := extentsSHA1(fileExtents)
+
+ if extSHA1 == searchSHA1 {
+ fmt.Printf("Found file: %s\t\tSHA1: %s\n", path, extSHA1)
+ }
+ }
+ return nil
+ })
+ if err != nil {
+ fmt.Println(err)
+ }
+ return nil
+}
+
+// If file system is not BTRFS return error
+func checkFS(target string) (err error) {
+ // Determine filesystem type
+ FsStats := &sys.Statfs_t{}
+ err = sys.Statfs(target, FsStats)
+ if err != nil {
+ log.Printf("Failed to retrieve filesystem information: %s", err)
+ return fmt.Errorf("%v", err)
+ }
+ if FsStats.Type != BTRFS_SUPER_MAGIC {
+ hexa := fmt.Sprintf("0x%02X", FsStats.Type)
+ log.Printf("Unsupported filesystem type: %s", hexa)
+ return fmt.Errorf("Unsupported filesystem type: %s", hexa)
+ }
+
+ return nil
+}
+
+// Parse command-line arguments
+func parseArgs() (err error) {
+ // Command line arguments parsing
+ options.Register(&opts)
+ options.Parse()
+ err = options.Validate(&opts)
+ if err != nil {
+ return fmt.Errorf("shx: Failed to parse arguments!\nError: %s\n", err)
+ }
+
+ return nil
+}
+
+// Close the Unix socket that is used for locking the process
+func closeUnixSocket(unixSocket *net.UnixListener) {
+ err := unixSocket.Close()
+ if err != nil {
+ log.Printf("Failed to close UNIX socket: %s", err)
+ os.Exit(1)
+ }
+}
+
+// Initialize the program
+func init() {
+ // Logger setup
+ log.SetFlags(log.LstdFlags) // LstdFlags will set timestamp to 'YYYY/MM/DD HH:MM:SS' format
+ log.SetPrefix("[ shx ]: ")
+ logFile, err := os.OpenFile(logFileName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
+ if err != nil {
+ fmt.Printf("Failed to open log file: %s: %s\n", logFileName, err)
+ os.Exit(1)
+ }
+ log.SetOutput(logFile)
+
+ // Parse command-line arguments
+ err = parseArgs()
+ if err != nil {
+ fmt.Printf("shx: Error: %s\n", err)
+ os.Exit(1)
+ }
+
+ // Check the filesystem for the file and target directory
+ err = checkFS(opts.WorkingDir)
+ if err != nil {
+ fmt.Printf("shx: Error: %s\n", err)
+ }
+ err = checkFS(opts.RefFileName)
+ if err != nil {
+ fmt.Printf("shx: Error: %s\n", err)
+ }
+}
+
+func main() {
+ // Attach to UNIX domain socket to ensure that a single program instance is running at a time
+ // This mechanism is more stable and does not create a race condition, unlike the conventional
+ // 'PID file' procedure which tends to cause issues due to the Linux kernel recycling PIDs
+ unixSocket, err := net.ListenUnix("unix", &net.UnixAddr{Name: "@shxunixsock", Net: "unix"})
+ if err != nil {
+ log.Printf("shx is already running. Exiting...\n")
+ os.Exit(1)
+ }
+ // Detach from UNIX socket
+ defer closeUnixSocket(unixSocket)
+
+ fmt.Printf("File to check: %s\nDirectory to scan: %s\n", opts.RefFileName, opts.WorkingDir)
+
+ // Test code
+ var FileName string = opts.RefFileName
+ fileExtents, err := getFileExtents(FileName)
+ if err != nil {
+ fmt.Printf("%s", err)
+ os.Exit(1)
+ }
+ extSHA1, err := extentsSHA1(fileExtents)
+ if err != nil {
+ fmt.Printf("%s\n", err)
+ os.Exit(1)
+ }
+ fmt.Printf("File: %s\tExtents SHA1: %s\n", FileName, extSHA1)
+ fmt.Printf("Scanning filesystem: \n\n")
+ err = walkDir(opts.WorkingDir, extSHA1)
+ if err != nil {
+ fmt.Printf("shx: Error: %s\n", err)
+ }
+}
projects / dev.git / commitdiff