From e28cf9f489b4b1d2a7e6ab2f6336c82f05ed92b5 Mon Sep 17 00:00:00 2001 From: christiangoeschel Date: Thu, 26 Sep 2024 23:29:59 -0400 Subject: [PATCH] Adding shx source files --- go/shx/go.mod | 10 +++ go/shx/go.sum | 156 ++++++++++++++++++++++++++++++++++ go/shx/shx.go | 228 ++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 394 insertions(+) create mode 100644 go/shx/go.mod create mode 100644 go/shx/go.sum create mode 100644 go/shx/shx.go diff --git a/go/shx/go.mod b/go/shx/go.mod new file mode 100644 index 0000000..472a944 --- /dev/null +++ b/go/shx/go.mod @@ -0,0 +1,10 @@ +module gitlab.com/christiangoeschel/shx + +go 1.23.0 + +require ( + github.com/frostschutz/go-fibmap v0.0.0-20160825162329-b32c231bfe6a // indirect + github.com/pborman/getopt/v2 v2.0.0-20200816005738-fd0d075bf4de // indirect + github.com/pborman/options v1.4.2 // indirect + golang.org/x/sys v0.24.0 // indirect +) diff --git a/go/shx/go.sum b/go/shx/go.sum new file mode 100644 index 0000000..3ddeb9a --- /dev/null +++ b/go/shx/go.sum @@ -0,0 +1,156 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU= +github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY= +github.com/cenkalti/backoff/v4 v4.1.1/go.mod h1:scbssz8iZGpm3xbr14ovlUdkxfGXNInqkPWOWmG2CLw= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod 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h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/go/shx/shx.go b/go/shx/shx.go new file mode 100644 index 0000000..7f90adf --- /dev/null +++ b/go/shx/shx.go @@ -0,0 +1,228 @@ +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) + } +} -- 2.39.5