Add support for zos/s390x

client.go

@@ -2113,13 +2113,12 @@ func normaliseError(err error) error {
 // Unsupported flags are ignored.
 func toPflags(f int) uint32 {
 	var out uint32
-	switch f & os.O_WRONLY {
-	case os.O_WRONLY:
-		out |= sshFxfWrite
+	switch f & (os.O_RDONLY | os.O_WRONLY | os.O_RDWR) {
 	case os.O_RDONLY:
 		out |= sshFxfRead
-	}
-	if f&os.O_RDWR == os.O_RDWR {
+	case os.O_WRONLY:
+		out |= sshFxfWrite
+	case os.O_RDWR:
 		out |= sshFxfRead | sshFxfWrite
 	}
 	if f&os.O_APPEND == os.O_APPEND {
@@ -2143,7 +2142,7 @@ func toPflags(f int) uint32 {
 // setuid, setgid and sticky in m, because we've historically supported those
 // bits, and we mask off any non-permission bits.
 func toChmodPerm(m os.FileMode) (perm uint32) {
-	const mask = os.ModePerm | s_ISUID | s_ISGID | s_ISVTX
+	const mask = os.ModePerm | os.FileMode(s_ISUID|s_ISGID|s_ISVTX)
 	perm = uint32(m & mask)
 
 	if m&os.ModeSetuid != 0 {

client_integration_test.go

@@ -974,7 +974,7 @@ func TestClientSetuid(t *testing.T) {
 	f.Close()
 
 	const allPerm = os.ModePerm | os.ModeSetuid | os.ModeSetgid | os.ModeSticky |
-		s_ISUID | s_ISGID | s_ISVTX
+		os.FileMode(s_ISUID|s_ISGID|s_ISVTX)
 
 	for _, c := range []struct {
 		goPerm    os.FileMode

errno_plan9.go

@@ -0,0 +1,42 @@
+package sftp
+
+import (
+	"os"
+	"syscall"
+)
+
+var EBADF = syscall.NewError("fd out of range or not open")
+
+func wrapPathError(filepath string, err error) error {
+	if errno, ok := err.(syscall.ErrorString); ok {
+		return &os.PathError{Path: filepath, Err: errno}
+	}
+	return err
+}
+
+// translateErrno translates a syscall error number to a SFTP error code.
+func translateErrno(errno syscall.ErrorString) uint32 {
+	switch errno {
+	case "":
+		return sshFxOk
+	case syscall.ENOENT:
+		return sshFxNoSuchFile
+	case syscall.EPERM:
+		return sshFxPermissionDenied
+	}
+
+	return sshFxFailure
+}
+
+func translateSyscallError(err error) (uint32, bool) {
+	switch e := err.(type) {
+	case syscall.ErrorString:
+		return translateErrno(e), true
+	case *os.PathError:
+		debug("statusFromError,pathError: error is %T %#v", e.Err, e.Err)
+		if errno, ok := e.Err.(syscall.ErrorString); ok {
+			return translateErrno(errno), true
+		}
+	}
+	return 0, false
+}

errno_posix.go

@@ -0,0 +1,45 @@
+//go:build !plan9
+// +build !plan9
+
+package sftp
+
+import (
+	"os"
+	"syscall"
+)
+
+const EBADF = syscall.EBADF
+
+func wrapPathError(filepath string, err error) error {
+	if errno, ok := err.(syscall.Errno); ok {
+		return &os.PathError{Path: filepath, Err: errno}
+	}
+	return err
+}
+
+// translateErrno translates a syscall error number to a SFTP error code.
+func translateErrno(errno syscall.Errno) uint32 {
+	switch errno {
+	case 0:
+		return sshFxOk
+	case syscall.ENOENT:
+		return sshFxNoSuchFile
+	case syscall.EACCES, syscall.EPERM:
+		return sshFxPermissionDenied
+	}
+
+	return sshFxFailure
+}
+
+func translateSyscallError(err error) (uint32, bool) {
+	switch e := err.(type) {
+	case syscall.Errno:
+		return translateErrno(e), true
+	case *os.PathError:
+		debug("statusFromError,pathError: error is %T %#v", e.Err, e.Err)
+		if errno, ok := e.Err.(syscall.Errno); ok {
+			return translateErrno(errno), true
+		}
+	}
+	return 0, false
+}

ls_formatting_test.go

@@ -3,6 +3,7 @@ package sftp
 import (
 	"os"
 	"regexp"
+	"runtime"
 	"strings"
 	"testing"
 	"time"
@@ -101,6 +102,12 @@ func runLsTestHelper(t *testing.T, result, expectedType, path string) {
 	dateTime := strings.Join(fields[5:8], " ")
 	filename := fields[8]
 
+	if runtime.GOOS == "zos" {
+		// User and Group are always only uppercase characters on z/OS
+		user = strings.ToLower(user)
+		group = strings.ToLower(group)
+	}
+
 	// permissions (len 10, "drwxr-xr-x")
 	const (
 		rwxs = "[-r][-w][-xsS]"

request-server_test.go

@@ -780,8 +780,13 @@ func TestRequestReaddir(t *testing.T) {
 		}
 	}
 	_, err := p.cli.ReadDir("/foo_01")
-	assert.Equal(t, &StatusError{Code: sshFxFailure,
-		msg: " /foo_01: not a directory"}, err)
+	if runtime.GOOS == "zos" {
+		assert.Equal(t, &StatusError{Code: sshFxFailure,
+			msg: " /foo_01: EDC5135I Not a directory."}, err)
+	} else {
+		assert.Equal(t, &StatusError{Code: sshFxFailure,
+			msg: " /foo_01: not a directory"}, err)
+	}
 	_, err = p.cli.ReadDir("/does_not_exist")
 	assert.Equal(t, os.ErrNotExist, err)
 	di, err := p.cli.ReadDir("/")

server_test.go

@@ -99,9 +99,14 @@ func TestInvalidExtendedPacket(t *testing.T) {
 // test that server handles concurrent requests correctly
 func TestConcurrentRequests(t *testing.T) {
 	skipIfWindows(t)
-	filename := "/etc/passwd"
-	if runtime.GOOS == "plan9" {
+	var filename string
+	switch runtime.GOOS {
+	case "plan9":
 		filename = "/lib/ndb/local"
+	case "zos":
+		filename = "/etc/.shrc"
+	default:
+		filename = "/etc/passwd"
 	}
 	client, server := clientServerPair(t)
 	defer client.Close()

stat.go

@@ -0,0 +1,93 @@
+package sftp
+
+import (
+	"os"
+
+	sshfx "github.com/pkg/sftp/internal/encoding/ssh/filexfer"
+)
+
+// isRegular returns true if the mode describes a regular file.
+func isRegular(mode uint32) bool {
+	return sshfx.FileMode(mode)&sshfx.ModeType == sshfx.ModeRegular
+}
+
+// toFileMode converts sftp filemode bits to the os.FileMode specification
+func toFileMode(mode uint32) os.FileMode {
+	var fm = os.FileMode(mode & 0777)
+
+	switch sshfx.FileMode(mode) & sshfx.ModeType {
+	case sshfx.ModeDevice:
+		fm |= os.ModeDevice
+	case sshfx.ModeCharDevice:
+		fm |= os.ModeDevice | os.ModeCharDevice
+	case sshfx.ModeDir:
+		fm |= os.ModeDir
+	case sshfx.ModeNamedPipe:
+		fm |= os.ModeNamedPipe
+	case sshfx.ModeSymlink:
+		fm |= os.ModeSymlink
+	case sshfx.ModeRegular:
+		// nothing to do
+	case sshfx.ModeSocket:
+		fm |= os.ModeSocket
+	}
+
+	if sshfx.FileMode(mode)&sshfx.ModeSetUID != 0 {
+		fm |= os.ModeSetuid
+	}
+	if sshfx.FileMode(mode)&sshfx.ModeSetGID != 0 {
+		fm |= os.ModeSetgid
+	}
+	if sshfx.FileMode(mode)&sshfx.ModeSticky != 0 {
+		fm |= os.ModeSticky
+	}
+
+	return fm
+}
+
+// fromFileMode converts from the os.FileMode specification to sftp filemode bits
+func fromFileMode(mode os.FileMode) uint32 {
+	ret := sshfx.FileMode(mode & os.ModePerm)
+
+	switch mode & os.ModeType {
+	case os.ModeDevice | os.ModeCharDevice:
+		ret |= sshfx.ModeCharDevice
+	case os.ModeDevice:
+		ret |= sshfx.ModeDevice
+	case os.ModeDir:
+		ret |= sshfx.ModeDir
+	case os.ModeNamedPipe:
+		ret |= sshfx.ModeNamedPipe
+	case os.ModeSymlink:
+		ret |= sshfx.ModeSymlink
+	case 0:
+		ret |= sshfx.ModeRegular
+	case os.ModeSocket:
+		ret |= sshfx.ModeSocket
+	}
+
+	if mode&os.ModeSetuid != 0 {
+		ret |= sshfx.ModeSetUID
+	}
+	if mode&os.ModeSetgid != 0 {
+		ret |= sshfx.ModeSetGID
+	}
+	if mode&os.ModeSticky != 0 {
+		ret |= sshfx.ModeSticky
+	}
+
+	return uint32(ret)
+}
+
+const (
+	s_ISUID = uint32(sshfx.ModeSetUID)
+	s_ISGID = uint32(sshfx.ModeSetGID)
+	s_ISVTX = uint32(sshfx.ModeSticky)
+)
+
+// Legacy export:
+//
+// Go defines S_IFMT on windows, plan9 and js/wasm as 0x1f000 instead of
+// 0xf000. None of the the other S_IFxyz values include the "1" (in 0x1f000)
+// which prevents them from matching the bitmask.
+const S_IFMT = uint32(sshfx.ModeType)