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Merge tag 'v0.8.20' into xc-bigfile-EOF
This commit is contained in:
Russ Magee
commit
62f630394b
3 changed files with 108 additions and 31 deletions
2
Makefile
2
Makefile
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@ -1,4 +1,4 @@
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VERSION := 0.8.19
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VERSION := 0.8.20
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.PHONY: lint vis clean common client server passwd subpkgs install uninstall reinstall
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## Tag version of binaries with build info wrt.
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@ -35,6 +35,7 @@ Currently supported session algorithms:
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* Twofish-128
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* Blowfish-64
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* CryptMTv1 (64bit) (https://eprint.iacr.org/2005/165.pdf)
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* ChaCha20 (https://github.com/aead/chacha20)
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[HMAC]
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* HMAC-SHA256
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@ -183,6 +184,8 @@ xc uses a 'tarpipe' to send file data over the encrypted channel. Use the -d fla
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NOTE: Renaming while copying (eg., 'cp /foo/bar/fileA ./fileB') is NOT supported. Put another way, the destination (whether local or remote) must ALWAYS be a directory.
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If the 'pv' pipeview utility is available (http://www.ivarch.com/programs/pv.shtml) file transfer progress and bandwidth control will be available (suppress the former with the -q option, set the latter with -L <bytes_per_second>).
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### Tunnels
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Simple tunnels (client -> server, no reverse tunnels for now) are supported.
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134
xs/xs.go
134
xs/xs.go
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@ -240,21 +240,47 @@ func GetSize() (cols, rows int, err error) {
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return
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}
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// doCopyMode begins a secure xs local<->remote file copy operation.
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//
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// TODO: reduce gocyclo
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func doCopyMode(conn *xsnet.Conn, remoteDest bool, files string, rec *xs.Session) (exitStatus uint32, err error) {
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if remoteDest {
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log.Println("local files:", files, "remote filepath:", string(rec.Cmd()))
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func buildCmdRemoteToLocal(copyQuiet bool, copyLimitBPS uint, destPath, files string) (captureStderr bool, cmd string, args []string) {
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// Detect if we have 'pv'
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// pipeview http://www.ivarch.com/programs/pv.shtml
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// and use it for nice client progress display.
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_, pverr := os.Stat("/usr/bin/pv")
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if pverr != nil {
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_, pverr = os.Stat("/usr/local/bin/pv")
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}
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var c *exec.Cmd
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if copyQuiet || pverr != nil {
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// copyQuiet and copyLimitBPS are not applicable in dumb copy mode
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captureStderr = true
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cmd = "/bin/tar"
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//os.Clearenv()
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//os.Setenv("HOME", u.HomeDir)
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//os.Setenv("TERM", "vt102") // TODO: server or client option?
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args = []string{"-xz", "-C", destPath}
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} else {
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// TODO: Query remote side for total file/dir size
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bandwidthInBytesPerSec := " -L " + fmt.Sprintf("%d ", copyLimitBPS)
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displayOpts := " -f -pr "
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cmd = "/bin/bash"
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args = []string{"-c", "pv " + displayOpts + bandwidthInBytesPerSec + "| tar -xz -C " + destPath}
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}
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log.Printf("[%v %v]\n", cmd, args)
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return
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}
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cmdName := "/bin/tar"
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cmdArgs := []string{"-cz", "-f", "/dev/stdout"}
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func buildCmdLocalToRemote(copyQuiet bool, copyLimitBPS uint, files string) (captureStderr bool, cmd string, args []string) {
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// Detect if we have 'pv'
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// pipeview http://www.ivarch.com/programs/pv.shtml
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// and use it for nice client progress display.
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_, pverr := os.Stat("/usr/bin/pv")
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if pverr != nil {
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_, pverr = os.Stat("/usr/local/bin/pv")
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}
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if pverr != nil {
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// copyQuiet and copyLimitBPS are not applicable in dumb copy mode
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captureStderr = true
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cmd = "/bin/tar"
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args = []string{"-cz", "-f", "/dev/stdout"}
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files = strings.TrimSpace(files)
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// Awesome fact: tar actually can take multiple -C args, and
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// changes to the dest dir *as it sees each one*. This enables
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@ -272,22 +298,70 @@ func doCopyMode(conn *xsnet.Conn, remoteDest bool, files string, rec *xs.Session
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v, _ = filepath.Abs(v) // #nosec
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dirTmp, fileTmp := path.Split(v)
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if dirTmp == "" {
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cmdArgs = append(cmdArgs, fileTmp)
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args = append(args, fileTmp)
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} else {
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cmdArgs = append(cmdArgs, "-C", dirTmp, fileTmp)
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args = append(args, "-C", dirTmp, fileTmp)
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}
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}
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} else {
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captureStderr = copyQuiet
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bandwidthInBytesPerSec := " -L " + fmt.Sprintf("%d", copyLimitBPS)
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displayOpts := " -f -pr "
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cmd = "/bin/bash"
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args = []string{"-c", "/bin/tar -cz -f /dev/stdout "}
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files = strings.TrimSpace(files)
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// Awesome fact: tar actually can take multiple -C args, and
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// changes to the dest dir *as it sees each one*. This enables
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// its use below, where clients can send scattered sets of source
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// files and dirs to be extracted to a single dest dir server-side,
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// whilst preserving the subtrees of dirs on the other side.
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// Eg., tar -c -f /dev/stdout -C /dirA fileInA -C /some/where/dirB fileInB /foo/dirC
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// packages fileInA, fileInB, and dirC at a single toplevel in the tar.
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// The tar authors are/were real smarties :)
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//
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// This is the 'scatter/gather' logic to allow specification of
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// files and dirs in different trees to be deposited in a single
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// remote destDir.
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for _, v := range strings.Split(files, " ") {
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v, _ = filepath.Abs(v) // #nosec
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dirTmp, fileTmp := path.Split(v)
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if dirTmp == "" {
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args[1] = args[1] + fileTmp + " "
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} else {
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args[1] = args[1] + " -C " + dirTmp + " " + fileTmp + " "
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}
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}
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args[1] = args[1] + "| pv" + displayOpts + bandwidthInBytesPerSec + " -s $(du -cb " + files + " | tail -1 | cut -f 1) -c"
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}
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log.Printf("[%v %v]\n", cmdName, cmdArgs)
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// NOTE the lack of quotes around --xform option's sed expression.
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// When args are passed in exec() format, no quoting is required
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// (as this isn't input from a shell) (right? -rlm 20180823)
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log.Printf("[%v %v]\n", cmd, args)
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return
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}
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// doCopyMode begins a secure xs local<->remote file copy operation.
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//
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// TODO: reduce gocyclo
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func doCopyMode(conn *xsnet.Conn, remoteDest bool, files string, copyQuiet bool, copyLimitBPS uint, rec *xs.Session) (exitStatus uint32, err error) {
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if remoteDest {
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log.Println("local files:", files, "remote filepath:", string(rec.Cmd()))
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var c *exec.Cmd
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//os.Clearenv()
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//os.Setenv("HOME", u.HomeDir)
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//os.Setenv("TERM", "vt102") // TODO: server or client option?
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captureStderr, cmdName, cmdArgs := buildCmdLocalToRemote(copyQuiet, copyLimitBPS, strings.TrimSpace(files))
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c = exec.Command(cmdName, cmdArgs...) // #nosec
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c.Dir, _ = os.Getwd() // #nosec
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log.Println("[wd:", c.Dir, "]")
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c.Stdout = conn
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stdErrBuffer := new(bytes.Buffer)
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c.Stderr = stdErrBuffer
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if captureStderr {
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c.Stderr = stdErrBuffer
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} else {
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c.Stderr = os.Stderr
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}
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// Start the command (no pty)
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err = c.Start() // returns immediately
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@ -320,7 +394,9 @@ func doCopyMode(conn *xsnet.Conn, remoteDest bool, files string, rec *xs.Session
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// an ExitStatus() method with the same signature.
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if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
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exitStatus = uint32(status.ExitStatus())
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fmt.Print(stdErrBuffer)
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if captureStderr {
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fmt.Print(stdErrBuffer)
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}
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}
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}
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}
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@ -353,17 +429,11 @@ func doCopyMode(conn *xsnet.Conn, remoteDest bool, files string, rec *xs.Session
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}
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} else {
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log.Println("remote filepath:", string(rec.Cmd()), "local files:", files)
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var c *exec.Cmd
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cmdName := "/bin/tar"
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destPath := files
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cmdArgs := []string{"-xz", "-C", destPath}
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log.Printf("[%v %v]\n", cmdName, cmdArgs)
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// NOTE the lack of quotes around --xform option's sed expression.
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// When args are passed in exec() format, no quoting is required
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// (as this isn't input from a shell) (right? -rlm 20180823)
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//cmdArgs := []string{"-xvz", "-C", destPath, `--xform=s#.*/\(.*\)#\1#`}
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_, cmdName, cmdArgs := buildCmdRemoteToLocal(copyQuiet, copyLimitBPS, destPath, strings.TrimSpace(files))
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var c *exec.Cmd
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c = exec.Command(cmdName, cmdArgs...) // #nosec
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c.Stdin = conn
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c.Stdout = os.Stdout
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@ -612,6 +682,8 @@ func main() {
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var copySrc []byte
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var copyDst string
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var copyQuiet bool
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var copyLimitBPS uint
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var authCookie string
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var chaffEnabled bool
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@ -649,6 +721,8 @@ func main() {
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shellMode = true
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flag.Usage = usageShell
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} else {
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flag.BoolVar(©Quiet, "q", false, "do not output progress bar during copy")
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flag.UintVar(©LimitBPS, "L", 8589934592, "copy max rate in bytes per sec")
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flag.Usage = usageCp
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}
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flag.Parse()
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@ -932,7 +1006,7 @@ func main() {
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launchTuns(&conn, remoteHost, tunSpecStr)
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doShellMode(isInteractive, &conn, oldState, rec)
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} else { // copyMode
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s, _ := doCopyMode(&conn, pathIsDest, fileArgs, rec) // nolint: errcheck,gosec
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s, _ := doCopyMode(&conn, pathIsDest, fileArgs, copyQuiet, copyLimitBPS, rec) // nolint: errcheck,gosec
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rec.SetStatus(s)
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}
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