forked from jshiffer/matterbridge
2482 lines
72 KiB
Go
2482 lines
72 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Linux system calls.
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// This file is compiled as ordinary Go code,
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// but it is also input to mksyscall,
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// which parses the //sys lines and generates system call stubs.
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// Note that sometimes we use a lowercase //sys name and
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// wrap it in our own nicer implementation.
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package unix
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import (
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"encoding/binary"
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"runtime"
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"syscall"
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"unsafe"
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)
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/*
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* Wrapped
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*/
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func Access(path string, mode uint32) (err error) {
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return Faccessat(AT_FDCWD, path, mode, 0)
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}
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func Chmod(path string, mode uint32) (err error) {
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return Fchmodat(AT_FDCWD, path, mode, 0)
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}
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func Chown(path string, uid int, gid int) (err error) {
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return Fchownat(AT_FDCWD, path, uid, gid, 0)
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}
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func Creat(path string, mode uint32) (fd int, err error) {
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return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode)
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}
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//sys FanotifyInit(flags uint, event_f_flags uint) (fd int, err error)
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//sys fanotifyMark(fd int, flags uint, mask uint64, dirFd int, pathname *byte) (err error)
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func FanotifyMark(fd int, flags uint, mask uint64, dirFd int, pathname string) (err error) {
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if pathname == "" {
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return fanotifyMark(fd, flags, mask, dirFd, nil)
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}
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p, err := BytePtrFromString(pathname)
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if err != nil {
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return err
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}
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return fanotifyMark(fd, flags, mask, dirFd, p)
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}
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//sys fchmodat(dirfd int, path string, mode uint32) (err error)
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func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
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// Linux fchmodat doesn't support the flags parameter. Mimick glibc's behavior
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// and check the flags. Otherwise the mode would be applied to the symlink
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// destination which is not what the user expects.
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if flags&^AT_SYMLINK_NOFOLLOW != 0 {
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return EINVAL
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} else if flags&AT_SYMLINK_NOFOLLOW != 0 {
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return EOPNOTSUPP
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}
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return fchmodat(dirfd, path, mode)
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}
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//sys ioctl(fd int, req uint, arg uintptr) (err error)
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// ioctl itself should not be exposed directly, but additional get/set
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// functions for specific types are permissible.
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// IoctlRetInt performs an ioctl operation specified by req on a device
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// associated with opened file descriptor fd, and returns a non-negative
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// integer that is returned by the ioctl syscall.
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func IoctlRetInt(fd int, req uint) (int, error) {
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ret, _, err := Syscall(SYS_IOCTL, uintptr(fd), uintptr(req), 0)
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if err != 0 {
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return 0, err
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}
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return int(ret), nil
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}
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func IoctlSetRTCTime(fd int, value *RTCTime) error {
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err := ioctl(fd, RTC_SET_TIME, uintptr(unsafe.Pointer(value)))
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runtime.KeepAlive(value)
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return err
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}
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func IoctlSetRTCWkAlrm(fd int, value *RTCWkAlrm) error {
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err := ioctl(fd, RTC_WKALM_SET, uintptr(unsafe.Pointer(value)))
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runtime.KeepAlive(value)
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return err
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}
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func IoctlGetUint32(fd int, req uint) (uint32, error) {
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var value uint32
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err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
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return value, err
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}
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func IoctlGetRTCTime(fd int) (*RTCTime, error) {
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var value RTCTime
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err := ioctl(fd, RTC_RD_TIME, uintptr(unsafe.Pointer(&value)))
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return &value, err
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}
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// IoctlGetWatchdogInfo fetches information about a watchdog device from the
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// Linux watchdog API. For more information, see:
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// https://www.kernel.org/doc/html/latest/watchdog/watchdog-api.html.
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func IoctlGetWatchdogInfo(fd int) (*WatchdogInfo, error) {
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var value WatchdogInfo
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err := ioctl(fd, WDIOC_GETSUPPORT, uintptr(unsafe.Pointer(&value)))
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return &value, err
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}
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func IoctlGetRTCWkAlrm(fd int) (*RTCWkAlrm, error) {
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var value RTCWkAlrm
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err := ioctl(fd, RTC_WKALM_RD, uintptr(unsafe.Pointer(&value)))
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return &value, err
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}
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// IoctlFileCloneRange performs an FICLONERANGE ioctl operation to clone the
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// range of data conveyed in value to the file associated with the file
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// descriptor destFd. See the ioctl_ficlonerange(2) man page for details.
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func IoctlFileCloneRange(destFd int, value *FileCloneRange) error {
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err := ioctl(destFd, FICLONERANGE, uintptr(unsafe.Pointer(value)))
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runtime.KeepAlive(value)
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return err
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}
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// IoctlFileClone performs an FICLONE ioctl operation to clone the entire file
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// associated with the file description srcFd to the file associated with the
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// file descriptor destFd. See the ioctl_ficlone(2) man page for details.
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func IoctlFileClone(destFd, srcFd int) error {
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return ioctl(destFd, FICLONE, uintptr(srcFd))
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}
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type FileDedupeRange struct {
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Src_offset uint64
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Src_length uint64
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Reserved1 uint16
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Reserved2 uint32
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Info []FileDedupeRangeInfo
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}
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type FileDedupeRangeInfo struct {
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Dest_fd int64
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Dest_offset uint64
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Bytes_deduped uint64
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Status int32
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Reserved uint32
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}
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// IoctlFileDedupeRange performs an FIDEDUPERANGE ioctl operation to share the
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// range of data conveyed in value from the file associated with the file
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// descriptor srcFd to the value.Info destinations. See the
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// ioctl_fideduperange(2) man page for details.
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func IoctlFileDedupeRange(srcFd int, value *FileDedupeRange) error {
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buf := make([]byte, SizeofRawFileDedupeRange+
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len(value.Info)*SizeofRawFileDedupeRangeInfo)
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rawrange := (*RawFileDedupeRange)(unsafe.Pointer(&buf[0]))
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rawrange.Src_offset = value.Src_offset
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rawrange.Src_length = value.Src_length
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rawrange.Dest_count = uint16(len(value.Info))
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rawrange.Reserved1 = value.Reserved1
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rawrange.Reserved2 = value.Reserved2
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for i := range value.Info {
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rawinfo := (*RawFileDedupeRangeInfo)(unsafe.Pointer(
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uintptr(unsafe.Pointer(&buf[0])) + uintptr(SizeofRawFileDedupeRange) +
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uintptr(i*SizeofRawFileDedupeRangeInfo)))
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rawinfo.Dest_fd = value.Info[i].Dest_fd
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rawinfo.Dest_offset = value.Info[i].Dest_offset
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rawinfo.Bytes_deduped = value.Info[i].Bytes_deduped
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rawinfo.Status = value.Info[i].Status
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rawinfo.Reserved = value.Info[i].Reserved
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}
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err := ioctl(srcFd, FIDEDUPERANGE, uintptr(unsafe.Pointer(&buf[0])))
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// Output
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for i := range value.Info {
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rawinfo := (*RawFileDedupeRangeInfo)(unsafe.Pointer(
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uintptr(unsafe.Pointer(&buf[0])) + uintptr(SizeofRawFileDedupeRange) +
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uintptr(i*SizeofRawFileDedupeRangeInfo)))
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value.Info[i].Dest_fd = rawinfo.Dest_fd
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value.Info[i].Dest_offset = rawinfo.Dest_offset
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value.Info[i].Bytes_deduped = rawinfo.Bytes_deduped
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value.Info[i].Status = rawinfo.Status
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value.Info[i].Reserved = rawinfo.Reserved
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}
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return err
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}
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// IoctlWatchdogKeepalive issues a keepalive ioctl to a watchdog device. For
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// more information, see:
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// https://www.kernel.org/doc/html/latest/watchdog/watchdog-api.html.
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func IoctlWatchdogKeepalive(fd int) error {
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return ioctl(fd, WDIOC_KEEPALIVE, 0)
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}
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func IoctlHIDGetDesc(fd int, value *HIDRawReportDescriptor) error {
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err := ioctl(fd, HIDIOCGRDESC, uintptr(unsafe.Pointer(value)))
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runtime.KeepAlive(value)
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return err
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}
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func IoctlHIDGetRawInfo(fd int) (*HIDRawDevInfo, error) {
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var value HIDRawDevInfo
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err := ioctl(fd, HIDIOCGRAWINFO, uintptr(unsafe.Pointer(&value)))
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return &value, err
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}
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func IoctlHIDGetRawName(fd int) (string, error) {
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var value [_HIDIOCGRAWNAME_LEN]byte
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err := ioctl(fd, _HIDIOCGRAWNAME, uintptr(unsafe.Pointer(&value[0])))
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return ByteSliceToString(value[:]), err
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}
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func IoctlHIDGetRawPhys(fd int) (string, error) {
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var value [_HIDIOCGRAWPHYS_LEN]byte
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err := ioctl(fd, _HIDIOCGRAWPHYS, uintptr(unsafe.Pointer(&value[0])))
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return ByteSliceToString(value[:]), err
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}
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func IoctlHIDGetRawUniq(fd int) (string, error) {
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var value [_HIDIOCGRAWUNIQ_LEN]byte
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err := ioctl(fd, _HIDIOCGRAWUNIQ, uintptr(unsafe.Pointer(&value[0])))
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return ByteSliceToString(value[:]), err
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}
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//sys Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error)
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func Link(oldpath string, newpath string) (err error) {
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return Linkat(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0)
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}
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func Mkdir(path string, mode uint32) (err error) {
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return Mkdirat(AT_FDCWD, path, mode)
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}
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func Mknod(path string, mode uint32, dev int) (err error) {
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return Mknodat(AT_FDCWD, path, mode, dev)
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}
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func Open(path string, mode int, perm uint32) (fd int, err error) {
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return openat(AT_FDCWD, path, mode|O_LARGEFILE, perm)
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}
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//sys openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
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func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) {
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return openat(dirfd, path, flags|O_LARGEFILE, mode)
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}
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//sys openat2(dirfd int, path string, open_how *OpenHow, size int) (fd int, err error)
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func Openat2(dirfd int, path string, how *OpenHow) (fd int, err error) {
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return openat2(dirfd, path, how, SizeofOpenHow)
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}
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//sys ppoll(fds *PollFd, nfds int, timeout *Timespec, sigmask *Sigset_t) (n int, err error)
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func Ppoll(fds []PollFd, timeout *Timespec, sigmask *Sigset_t) (n int, err error) {
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if len(fds) == 0 {
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return ppoll(nil, 0, timeout, sigmask)
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}
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return ppoll(&fds[0], len(fds), timeout, sigmask)
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}
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//sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error)
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func Readlink(path string, buf []byte) (n int, err error) {
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return Readlinkat(AT_FDCWD, path, buf)
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}
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func Rename(oldpath string, newpath string) (err error) {
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return Renameat(AT_FDCWD, oldpath, AT_FDCWD, newpath)
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}
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func Rmdir(path string) error {
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return Unlinkat(AT_FDCWD, path, AT_REMOVEDIR)
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}
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//sys Symlinkat(oldpath string, newdirfd int, newpath string) (err error)
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func Symlink(oldpath string, newpath string) (err error) {
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return Symlinkat(oldpath, AT_FDCWD, newpath)
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}
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func Unlink(path string) error {
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return Unlinkat(AT_FDCWD, path, 0)
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}
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//sys Unlinkat(dirfd int, path string, flags int) (err error)
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func Utimes(path string, tv []Timeval) error {
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if tv == nil {
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err := utimensat(AT_FDCWD, path, nil, 0)
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if err != ENOSYS {
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return err
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}
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return utimes(path, nil)
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}
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if len(tv) != 2 {
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return EINVAL
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}
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var ts [2]Timespec
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ts[0] = NsecToTimespec(TimevalToNsec(tv[0]))
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ts[1] = NsecToTimespec(TimevalToNsec(tv[1]))
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err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
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if err != ENOSYS {
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return err
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}
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return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
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}
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//sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error)
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func UtimesNano(path string, ts []Timespec) error {
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if ts == nil {
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err := utimensat(AT_FDCWD, path, nil, 0)
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if err != ENOSYS {
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return err
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}
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return utimes(path, nil)
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}
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if len(ts) != 2 {
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return EINVAL
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}
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err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
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if err != ENOSYS {
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return err
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}
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// If the utimensat syscall isn't available (utimensat was added to Linux
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// in 2.6.22, Released, 8 July 2007) then fall back to utimes
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var tv [2]Timeval
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for i := 0; i < 2; i++ {
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tv[i] = NsecToTimeval(TimespecToNsec(ts[i]))
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}
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return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
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}
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func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error {
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if ts == nil {
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return utimensat(dirfd, path, nil, flags)
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}
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if len(ts) != 2 {
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return EINVAL
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}
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return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags)
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}
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func Futimesat(dirfd int, path string, tv []Timeval) error {
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if tv == nil {
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return futimesat(dirfd, path, nil)
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}
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if len(tv) != 2 {
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return EINVAL
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}
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return futimesat(dirfd, path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
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}
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func Futimes(fd int, tv []Timeval) (err error) {
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// Believe it or not, this is the best we can do on Linux
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// (and is what glibc does).
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return Utimes("/proc/self/fd/"+itoa(fd), tv)
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}
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const ImplementsGetwd = true
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//sys Getcwd(buf []byte) (n int, err error)
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func Getwd() (wd string, err error) {
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var buf [PathMax]byte
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n, err := Getcwd(buf[0:])
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if err != nil {
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return "", err
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}
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// Getcwd returns the number of bytes written to buf, including the NUL.
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if n < 1 || n > len(buf) || buf[n-1] != 0 {
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return "", EINVAL
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}
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return string(buf[0 : n-1]), nil
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}
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func Getgroups() (gids []int, err error) {
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n, err := getgroups(0, nil)
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if err != nil {
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return nil, err
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}
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if n == 0 {
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return nil, nil
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}
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// Sanity check group count. Max is 1<<16 on Linux.
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if n < 0 || n > 1<<20 {
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return nil, EINVAL
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}
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a := make([]_Gid_t, n)
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n, err = getgroups(n, &a[0])
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if err != nil {
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return nil, err
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}
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gids = make([]int, n)
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for i, v := range a[0:n] {
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gids[i] = int(v)
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}
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return
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}
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func Setgroups(gids []int) (err error) {
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if len(gids) == 0 {
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return setgroups(0, nil)
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}
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a := make([]_Gid_t, len(gids))
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for i, v := range gids {
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a[i] = _Gid_t(v)
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}
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return setgroups(len(a), &a[0])
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}
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type WaitStatus uint32
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// Wait status is 7 bits at bottom, either 0 (exited),
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// 0x7F (stopped), or a signal number that caused an exit.
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// The 0x80 bit is whether there was a core dump.
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// An extra number (exit code, signal causing a stop)
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// is in the high bits. At least that's the idea.
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// There are various irregularities. For example, the
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// "continued" status is 0xFFFF, distinguishing itself
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// from stopped via the core dump bit.
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const (
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mask = 0x7F
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core = 0x80
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exited = 0x00
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stopped = 0x7F
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shift = 8
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)
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func (w WaitStatus) Exited() bool { return w&mask == exited }
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func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != exited }
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func (w WaitStatus) Stopped() bool { return w&0xFF == stopped }
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func (w WaitStatus) Continued() bool { return w == 0xFFFF }
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func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 }
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func (w WaitStatus) ExitStatus() int {
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if !w.Exited() {
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return -1
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}
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return int(w>>shift) & 0xFF
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}
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func (w WaitStatus) Signal() syscall.Signal {
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if !w.Signaled() {
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return -1
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}
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return syscall.Signal(w & mask)
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}
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func (w WaitStatus) StopSignal() syscall.Signal {
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if !w.Stopped() {
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return -1
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}
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return syscall.Signal(w>>shift) & 0xFF
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}
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func (w WaitStatus) TrapCause() int {
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if w.StopSignal() != SIGTRAP {
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return -1
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}
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return int(w>>shift) >> 8
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}
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//sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error)
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|
|
func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
|
|
var status _C_int
|
|
wpid, err = wait4(pid, &status, options, rusage)
|
|
if wstatus != nil {
|
|
*wstatus = WaitStatus(status)
|
|
}
|
|
return
|
|
}
|
|
|
|
func Mkfifo(path string, mode uint32) error {
|
|
return Mknod(path, mode|S_IFIFO, 0)
|
|
}
|
|
|
|
func Mkfifoat(dirfd int, path string, mode uint32) error {
|
|
return Mknodat(dirfd, path, mode|S_IFIFO, 0)
|
|
}
|
|
|
|
func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
if sa.Port < 0 || sa.Port > 0xFFFF {
|
|
return nil, 0, EINVAL
|
|
}
|
|
sa.raw.Family = AF_INET
|
|
p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
|
|
p[0] = byte(sa.Port >> 8)
|
|
p[1] = byte(sa.Port)
|
|
for i := 0; i < len(sa.Addr); i++ {
|
|
sa.raw.Addr[i] = sa.Addr[i]
|
|
}
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrInet4, nil
|
|
}
|
|
|
|
func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
if sa.Port < 0 || sa.Port > 0xFFFF {
|
|
return nil, 0, EINVAL
|
|
}
|
|
sa.raw.Family = AF_INET6
|
|
p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
|
|
p[0] = byte(sa.Port >> 8)
|
|
p[1] = byte(sa.Port)
|
|
sa.raw.Scope_id = sa.ZoneId
|
|
for i := 0; i < len(sa.Addr); i++ {
|
|
sa.raw.Addr[i] = sa.Addr[i]
|
|
}
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil
|
|
}
|
|
|
|
func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
name := sa.Name
|
|
n := len(name)
|
|
if n >= len(sa.raw.Path) {
|
|
return nil, 0, EINVAL
|
|
}
|
|
sa.raw.Family = AF_UNIX
|
|
for i := 0; i < n; i++ {
|
|
sa.raw.Path[i] = int8(name[i])
|
|
}
|
|
// length is family (uint16), name, NUL.
|
|
sl := _Socklen(2)
|
|
if n > 0 {
|
|
sl += _Socklen(n) + 1
|
|
}
|
|
if sa.raw.Path[0] == '@' {
|
|
sa.raw.Path[0] = 0
|
|
// Don't count trailing NUL for abstract address.
|
|
sl--
|
|
}
|
|
|
|
return unsafe.Pointer(&sa.raw), sl, nil
|
|
}
|
|
|
|
// SockaddrLinklayer implements the Sockaddr interface for AF_PACKET type sockets.
|
|
type SockaddrLinklayer struct {
|
|
Protocol uint16
|
|
Ifindex int
|
|
Hatype uint16
|
|
Pkttype uint8
|
|
Halen uint8
|
|
Addr [8]byte
|
|
raw RawSockaddrLinklayer
|
|
}
|
|
|
|
func (sa *SockaddrLinklayer) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff {
|
|
return nil, 0, EINVAL
|
|
}
|
|
sa.raw.Family = AF_PACKET
|
|
sa.raw.Protocol = sa.Protocol
|
|
sa.raw.Ifindex = int32(sa.Ifindex)
|
|
sa.raw.Hatype = sa.Hatype
|
|
sa.raw.Pkttype = sa.Pkttype
|
|
sa.raw.Halen = sa.Halen
|
|
for i := 0; i < len(sa.Addr); i++ {
|
|
sa.raw.Addr[i] = sa.Addr[i]
|
|
}
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrLinklayer, nil
|
|
}
|
|
|
|
// SockaddrNetlink implements the Sockaddr interface for AF_NETLINK type sockets.
|
|
type SockaddrNetlink struct {
|
|
Family uint16
|
|
Pad uint16
|
|
Pid uint32
|
|
Groups uint32
|
|
raw RawSockaddrNetlink
|
|
}
|
|
|
|
func (sa *SockaddrNetlink) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
sa.raw.Family = AF_NETLINK
|
|
sa.raw.Pad = sa.Pad
|
|
sa.raw.Pid = sa.Pid
|
|
sa.raw.Groups = sa.Groups
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrNetlink, nil
|
|
}
|
|
|
|
// SockaddrHCI implements the Sockaddr interface for AF_BLUETOOTH type sockets
|
|
// using the HCI protocol.
|
|
type SockaddrHCI struct {
|
|
Dev uint16
|
|
Channel uint16
|
|
raw RawSockaddrHCI
|
|
}
|
|
|
|
func (sa *SockaddrHCI) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
sa.raw.Family = AF_BLUETOOTH
|
|
sa.raw.Dev = sa.Dev
|
|
sa.raw.Channel = sa.Channel
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrHCI, nil
|
|
}
|
|
|
|
// SockaddrL2 implements the Sockaddr interface for AF_BLUETOOTH type sockets
|
|
// using the L2CAP protocol.
|
|
type SockaddrL2 struct {
|
|
PSM uint16
|
|
CID uint16
|
|
Addr [6]uint8
|
|
AddrType uint8
|
|
raw RawSockaddrL2
|
|
}
|
|
|
|
func (sa *SockaddrL2) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
sa.raw.Family = AF_BLUETOOTH
|
|
psm := (*[2]byte)(unsafe.Pointer(&sa.raw.Psm))
|
|
psm[0] = byte(sa.PSM)
|
|
psm[1] = byte(sa.PSM >> 8)
|
|
for i := 0; i < len(sa.Addr); i++ {
|
|
sa.raw.Bdaddr[i] = sa.Addr[len(sa.Addr)-1-i]
|
|
}
|
|
cid := (*[2]byte)(unsafe.Pointer(&sa.raw.Cid))
|
|
cid[0] = byte(sa.CID)
|
|
cid[1] = byte(sa.CID >> 8)
|
|
sa.raw.Bdaddr_type = sa.AddrType
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrL2, nil
|
|
}
|
|
|
|
// SockaddrRFCOMM implements the Sockaddr interface for AF_BLUETOOTH type sockets
|
|
// using the RFCOMM protocol.
|
|
//
|
|
// Server example:
|
|
//
|
|
// fd, _ := Socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)
|
|
// _ = unix.Bind(fd, &unix.SockaddrRFCOMM{
|
|
// Channel: 1,
|
|
// Addr: [6]uint8{0, 0, 0, 0, 0, 0}, // BDADDR_ANY or 00:00:00:00:00:00
|
|
// })
|
|
// _ = Listen(fd, 1)
|
|
// nfd, sa, _ := Accept(fd)
|
|
// fmt.Printf("conn addr=%v fd=%d", sa.(*unix.SockaddrRFCOMM).Addr, nfd)
|
|
// Read(nfd, buf)
|
|
//
|
|
// Client example:
|
|
//
|
|
// fd, _ := Socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)
|
|
// _ = Connect(fd, &SockaddrRFCOMM{
|
|
// Channel: 1,
|
|
// Addr: [6]byte{0x11, 0x22, 0x33, 0xaa, 0xbb, 0xcc}, // CC:BB:AA:33:22:11
|
|
// })
|
|
// Write(fd, []byte(`hello`))
|
|
type SockaddrRFCOMM struct {
|
|
// Addr represents a bluetooth address, byte ordering is little-endian.
|
|
Addr [6]uint8
|
|
|
|
// Channel is a designated bluetooth channel, only 1-30 are available for use.
|
|
// Since Linux 2.6.7 and further zero value is the first available channel.
|
|
Channel uint8
|
|
|
|
raw RawSockaddrRFCOMM
|
|
}
|
|
|
|
func (sa *SockaddrRFCOMM) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
sa.raw.Family = AF_BLUETOOTH
|
|
sa.raw.Channel = sa.Channel
|
|
sa.raw.Bdaddr = sa.Addr
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrRFCOMM, nil
|
|
}
|
|
|
|
// SockaddrCAN implements the Sockaddr interface for AF_CAN type sockets.
|
|
// The RxID and TxID fields are used for transport protocol addressing in
|
|
// (CAN_TP16, CAN_TP20, CAN_MCNET, and CAN_ISOTP), they can be left with
|
|
// zero values for CAN_RAW and CAN_BCM sockets as they have no meaning.
|
|
//
|
|
// The SockaddrCAN struct must be bound to the socket file descriptor
|
|
// using Bind before the CAN socket can be used.
|
|
//
|
|
// // Read one raw CAN frame
|
|
// fd, _ := Socket(AF_CAN, SOCK_RAW, CAN_RAW)
|
|
// addr := &SockaddrCAN{Ifindex: index}
|
|
// Bind(fd, addr)
|
|
// frame := make([]byte, 16)
|
|
// Read(fd, frame)
|
|
//
|
|
// The full SocketCAN documentation can be found in the linux kernel
|
|
// archives at: https://www.kernel.org/doc/Documentation/networking/can.txt
|
|
type SockaddrCAN struct {
|
|
Ifindex int
|
|
RxID uint32
|
|
TxID uint32
|
|
raw RawSockaddrCAN
|
|
}
|
|
|
|
func (sa *SockaddrCAN) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff {
|
|
return nil, 0, EINVAL
|
|
}
|
|
sa.raw.Family = AF_CAN
|
|
sa.raw.Ifindex = int32(sa.Ifindex)
|
|
rx := (*[4]byte)(unsafe.Pointer(&sa.RxID))
|
|
for i := 0; i < 4; i++ {
|
|
sa.raw.Addr[i] = rx[i]
|
|
}
|
|
tx := (*[4]byte)(unsafe.Pointer(&sa.TxID))
|
|
for i := 0; i < 4; i++ {
|
|
sa.raw.Addr[i+4] = tx[i]
|
|
}
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrCAN, nil
|
|
}
|
|
|
|
// SockaddrCANJ1939 implements the Sockaddr interface for AF_CAN using J1939
|
|
// protocol (https://en.wikipedia.org/wiki/SAE_J1939). For more information
|
|
// on the purposes of the fields, check the official linux kernel documentation
|
|
// available here: https://www.kernel.org/doc/Documentation/networking/j1939.rst
|
|
type SockaddrCANJ1939 struct {
|
|
Ifindex int
|
|
Name uint64
|
|
PGN uint32
|
|
Addr uint8
|
|
raw RawSockaddrCAN
|
|
}
|
|
|
|
func (sa *SockaddrCANJ1939) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff {
|
|
return nil, 0, EINVAL
|
|
}
|
|
sa.raw.Family = AF_CAN
|
|
sa.raw.Ifindex = int32(sa.Ifindex)
|
|
n := (*[8]byte)(unsafe.Pointer(&sa.Name))
|
|
for i := 0; i < 8; i++ {
|
|
sa.raw.Addr[i] = n[i]
|
|
}
|
|
p := (*[4]byte)(unsafe.Pointer(&sa.PGN))
|
|
for i := 0; i < 4; i++ {
|
|
sa.raw.Addr[i+8] = p[i]
|
|
}
|
|
sa.raw.Addr[12] = sa.Addr
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrCAN, nil
|
|
}
|
|
|
|
// SockaddrALG implements the Sockaddr interface for AF_ALG type sockets.
|
|
// SockaddrALG enables userspace access to the Linux kernel's cryptography
|
|
// subsystem. The Type and Name fields specify which type of hash or cipher
|
|
// should be used with a given socket.
|
|
//
|
|
// To create a file descriptor that provides access to a hash or cipher, both
|
|
// Bind and Accept must be used. Once the setup process is complete, input
|
|
// data can be written to the socket, processed by the kernel, and then read
|
|
// back as hash output or ciphertext.
|
|
//
|
|
// Here is an example of using an AF_ALG socket with SHA1 hashing.
|
|
// The initial socket setup process is as follows:
|
|
//
|
|
// // Open a socket to perform SHA1 hashing.
|
|
// fd, _ := unix.Socket(unix.AF_ALG, unix.SOCK_SEQPACKET, 0)
|
|
// addr := &unix.SockaddrALG{Type: "hash", Name: "sha1"}
|
|
// unix.Bind(fd, addr)
|
|
// // Note: unix.Accept does not work at this time; must invoke accept()
|
|
// // manually using unix.Syscall.
|
|
// hashfd, _, _ := unix.Syscall(unix.SYS_ACCEPT, uintptr(fd), 0, 0)
|
|
//
|
|
// Once a file descriptor has been returned from Accept, it may be used to
|
|
// perform SHA1 hashing. The descriptor is not safe for concurrent use, but
|
|
// may be re-used repeatedly with subsequent Write and Read operations.
|
|
//
|
|
// When hashing a small byte slice or string, a single Write and Read may
|
|
// be used:
|
|
//
|
|
// // Assume hashfd is already configured using the setup process.
|
|
// hash := os.NewFile(hashfd, "sha1")
|
|
// // Hash an input string and read the results. Each Write discards
|
|
// // previous hash state. Read always reads the current state.
|
|
// b := make([]byte, 20)
|
|
// for i := 0; i < 2; i++ {
|
|
// io.WriteString(hash, "Hello, world.")
|
|
// hash.Read(b)
|
|
// fmt.Println(hex.EncodeToString(b))
|
|
// }
|
|
// // Output:
|
|
// // 2ae01472317d1935a84797ec1983ae243fc6aa28
|
|
// // 2ae01472317d1935a84797ec1983ae243fc6aa28
|
|
//
|
|
// For hashing larger byte slices, or byte streams such as those read from
|
|
// a file or socket, use Sendto with MSG_MORE to instruct the kernel to update
|
|
// the hash digest instead of creating a new one for a given chunk and finalizing it.
|
|
//
|
|
// // Assume hashfd and addr are already configured using the setup process.
|
|
// hash := os.NewFile(hashfd, "sha1")
|
|
// // Hash the contents of a file.
|
|
// f, _ := os.Open("/tmp/linux-4.10-rc7.tar.xz")
|
|
// b := make([]byte, 4096)
|
|
// for {
|
|
// n, err := f.Read(b)
|
|
// if err == io.EOF {
|
|
// break
|
|
// }
|
|
// unix.Sendto(hashfd, b[:n], unix.MSG_MORE, addr)
|
|
// }
|
|
// hash.Read(b)
|
|
// fmt.Println(hex.EncodeToString(b))
|
|
// // Output: 85cdcad0c06eef66f805ecce353bec9accbeecc5
|
|
//
|
|
// For more information, see: http://www.chronox.de/crypto-API/crypto/userspace-if.html.
|
|
type SockaddrALG struct {
|
|
Type string
|
|
Name string
|
|
Feature uint32
|
|
Mask uint32
|
|
raw RawSockaddrALG
|
|
}
|
|
|
|
func (sa *SockaddrALG) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
// Leave room for NUL byte terminator.
|
|
if len(sa.Type) > 13 {
|
|
return nil, 0, EINVAL
|
|
}
|
|
if len(sa.Name) > 63 {
|
|
return nil, 0, EINVAL
|
|
}
|
|
|
|
sa.raw.Family = AF_ALG
|
|
sa.raw.Feat = sa.Feature
|
|
sa.raw.Mask = sa.Mask
|
|
|
|
typ, err := ByteSliceFromString(sa.Type)
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
name, err := ByteSliceFromString(sa.Name)
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
|
|
copy(sa.raw.Type[:], typ)
|
|
copy(sa.raw.Name[:], name)
|
|
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrALG, nil
|
|
}
|
|
|
|
// SockaddrVM implements the Sockaddr interface for AF_VSOCK type sockets.
|
|
// SockaddrVM provides access to Linux VM sockets: a mechanism that enables
|
|
// bidirectional communication between a hypervisor and its guest virtual
|
|
// machines.
|
|
type SockaddrVM struct {
|
|
// CID and Port specify a context ID and port address for a VM socket.
|
|
// Guests have a unique CID, and hosts may have a well-known CID of:
|
|
// - VMADDR_CID_HYPERVISOR: refers to the hypervisor process.
|
|
// - VMADDR_CID_HOST: refers to other processes on the host.
|
|
CID uint32
|
|
Port uint32
|
|
raw RawSockaddrVM
|
|
}
|
|
|
|
func (sa *SockaddrVM) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
sa.raw.Family = AF_VSOCK
|
|
sa.raw.Port = sa.Port
|
|
sa.raw.Cid = sa.CID
|
|
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrVM, nil
|
|
}
|
|
|
|
type SockaddrXDP struct {
|
|
Flags uint16
|
|
Ifindex uint32
|
|
QueueID uint32
|
|
SharedUmemFD uint32
|
|
raw RawSockaddrXDP
|
|
}
|
|
|
|
func (sa *SockaddrXDP) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
sa.raw.Family = AF_XDP
|
|
sa.raw.Flags = sa.Flags
|
|
sa.raw.Ifindex = sa.Ifindex
|
|
sa.raw.Queue_id = sa.QueueID
|
|
sa.raw.Shared_umem_fd = sa.SharedUmemFD
|
|
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrXDP, nil
|
|
}
|
|
|
|
// This constant mirrors the #define of PX_PROTO_OE in
|
|
// linux/if_pppox.h. We're defining this by hand here instead of
|
|
// autogenerating through mkerrors.sh because including
|
|
// linux/if_pppox.h causes some declaration conflicts with other
|
|
// includes (linux/if_pppox.h includes linux/in.h, which conflicts
|
|
// with netinet/in.h). Given that we only need a single zero constant
|
|
// out of that file, it's cleaner to just define it by hand here.
|
|
const px_proto_oe = 0
|
|
|
|
type SockaddrPPPoE struct {
|
|
SID uint16
|
|
Remote []byte
|
|
Dev string
|
|
raw RawSockaddrPPPoX
|
|
}
|
|
|
|
func (sa *SockaddrPPPoE) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
if len(sa.Remote) != 6 {
|
|
return nil, 0, EINVAL
|
|
}
|
|
if len(sa.Dev) > IFNAMSIZ-1 {
|
|
return nil, 0, EINVAL
|
|
}
|
|
|
|
*(*uint16)(unsafe.Pointer(&sa.raw[0])) = AF_PPPOX
|
|
// This next field is in host-endian byte order. We can't use the
|
|
// same unsafe pointer cast as above, because this value is not
|
|
// 32-bit aligned and some architectures don't allow unaligned
|
|
// access.
|
|
//
|
|
// However, the value of px_proto_oe is 0, so we can use
|
|
// encoding/binary helpers to write the bytes without worrying
|
|
// about the ordering.
|
|
binary.BigEndian.PutUint32(sa.raw[2:6], px_proto_oe)
|
|
// This field is deliberately big-endian, unlike the previous
|
|
// one. The kernel expects SID to be in network byte order.
|
|
binary.BigEndian.PutUint16(sa.raw[6:8], sa.SID)
|
|
copy(sa.raw[8:14], sa.Remote)
|
|
for i := 14; i < 14+IFNAMSIZ; i++ {
|
|
sa.raw[i] = 0
|
|
}
|
|
copy(sa.raw[14:], sa.Dev)
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrPPPoX, nil
|
|
}
|
|
|
|
// SockaddrTIPC implements the Sockaddr interface for AF_TIPC type sockets.
|
|
// For more information on TIPC, see: http://tipc.sourceforge.net/.
|
|
type SockaddrTIPC struct {
|
|
// Scope is the publication scopes when binding service/service range.
|
|
// Should be set to TIPC_CLUSTER_SCOPE or TIPC_NODE_SCOPE.
|
|
Scope int
|
|
|
|
// Addr is the type of address used to manipulate a socket. Addr must be
|
|
// one of:
|
|
// - *TIPCSocketAddr: "id" variant in the C addr union
|
|
// - *TIPCServiceRange: "nameseq" variant in the C addr union
|
|
// - *TIPCServiceName: "name" variant in the C addr union
|
|
//
|
|
// If nil, EINVAL will be returned when the structure is used.
|
|
Addr TIPCAddr
|
|
|
|
raw RawSockaddrTIPC
|
|
}
|
|
|
|
// TIPCAddr is implemented by types that can be used as an address for
|
|
// SockaddrTIPC. It is only implemented by *TIPCSocketAddr, *TIPCServiceRange,
|
|
// and *TIPCServiceName.
|
|
type TIPCAddr interface {
|
|
tipcAddrtype() uint8
|
|
tipcAddr() [12]byte
|
|
}
|
|
|
|
func (sa *TIPCSocketAddr) tipcAddr() [12]byte {
|
|
var out [12]byte
|
|
copy(out[:], (*(*[unsafe.Sizeof(TIPCSocketAddr{})]byte)(unsafe.Pointer(sa)))[:])
|
|
return out
|
|
}
|
|
|
|
func (sa *TIPCSocketAddr) tipcAddrtype() uint8 { return TIPC_SOCKET_ADDR }
|
|
|
|
func (sa *TIPCServiceRange) tipcAddr() [12]byte {
|
|
var out [12]byte
|
|
copy(out[:], (*(*[unsafe.Sizeof(TIPCServiceRange{})]byte)(unsafe.Pointer(sa)))[:])
|
|
return out
|
|
}
|
|
|
|
func (sa *TIPCServiceRange) tipcAddrtype() uint8 { return TIPC_SERVICE_RANGE }
|
|
|
|
func (sa *TIPCServiceName) tipcAddr() [12]byte {
|
|
var out [12]byte
|
|
copy(out[:], (*(*[unsafe.Sizeof(TIPCServiceName{})]byte)(unsafe.Pointer(sa)))[:])
|
|
return out
|
|
}
|
|
|
|
func (sa *TIPCServiceName) tipcAddrtype() uint8 { return TIPC_SERVICE_ADDR }
|
|
|
|
func (sa *SockaddrTIPC) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
if sa.Addr == nil {
|
|
return nil, 0, EINVAL
|
|
}
|
|
|
|
sa.raw.Family = AF_TIPC
|
|
sa.raw.Scope = int8(sa.Scope)
|
|
sa.raw.Addrtype = sa.Addr.tipcAddrtype()
|
|
sa.raw.Addr = sa.Addr.tipcAddr()
|
|
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrTIPC, nil
|
|
}
|
|
|
|
// SockaddrL2TPIP implements the Sockaddr interface for IPPROTO_L2TP/AF_INET sockets.
|
|
type SockaddrL2TPIP struct {
|
|
Addr [4]byte
|
|
ConnId uint32
|
|
raw RawSockaddrL2TPIP
|
|
}
|
|
|
|
func (sa *SockaddrL2TPIP) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
sa.raw.Family = AF_INET
|
|
sa.raw.Conn_id = sa.ConnId
|
|
for i := 0; i < len(sa.Addr); i++ {
|
|
sa.raw.Addr[i] = sa.Addr[i]
|
|
}
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrL2TPIP, nil
|
|
}
|
|
|
|
// SockaddrL2TPIP6 implements the Sockaddr interface for IPPROTO_L2TP/AF_INET6 sockets.
|
|
type SockaddrL2TPIP6 struct {
|
|
Addr [16]byte
|
|
ZoneId uint32
|
|
ConnId uint32
|
|
raw RawSockaddrL2TPIP6
|
|
}
|
|
|
|
func (sa *SockaddrL2TPIP6) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
sa.raw.Family = AF_INET6
|
|
sa.raw.Conn_id = sa.ConnId
|
|
sa.raw.Scope_id = sa.ZoneId
|
|
for i := 0; i < len(sa.Addr); i++ {
|
|
sa.raw.Addr[i] = sa.Addr[i]
|
|
}
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrL2TPIP6, nil
|
|
}
|
|
|
|
// SockaddrIUCV implements the Sockaddr interface for AF_IUCV sockets.
|
|
type SockaddrIUCV struct {
|
|
UserID string
|
|
Name string
|
|
raw RawSockaddrIUCV
|
|
}
|
|
|
|
func (sa *SockaddrIUCV) sockaddr() (unsafe.Pointer, _Socklen, error) {
|
|
sa.raw.Family = AF_IUCV
|
|
// These are EBCDIC encoded by the kernel, but we still need to pad them
|
|
// with blanks. Initializing with blanks allows the caller to feed in either
|
|
// a padded or an unpadded string.
|
|
for i := 0; i < 8; i++ {
|
|
sa.raw.Nodeid[i] = ' '
|
|
sa.raw.User_id[i] = ' '
|
|
sa.raw.Name[i] = ' '
|
|
}
|
|
if len(sa.UserID) > 8 || len(sa.Name) > 8 {
|
|
return nil, 0, EINVAL
|
|
}
|
|
for i, b := range []byte(sa.UserID[:]) {
|
|
sa.raw.User_id[i] = int8(b)
|
|
}
|
|
for i, b := range []byte(sa.Name[:]) {
|
|
sa.raw.Name[i] = int8(b)
|
|
}
|
|
return unsafe.Pointer(&sa.raw), SizeofSockaddrIUCV, nil
|
|
}
|
|
|
|
var socketProtocol = func(fd int) (int, error) {
|
|
return GetsockoptInt(fd, SOL_SOCKET, SO_PROTOCOL)
|
|
}
|
|
|
|
func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
|
|
switch rsa.Addr.Family {
|
|
case AF_NETLINK:
|
|
pp := (*RawSockaddrNetlink)(unsafe.Pointer(rsa))
|
|
sa := new(SockaddrNetlink)
|
|
sa.Family = pp.Family
|
|
sa.Pad = pp.Pad
|
|
sa.Pid = pp.Pid
|
|
sa.Groups = pp.Groups
|
|
return sa, nil
|
|
|
|
case AF_PACKET:
|
|
pp := (*RawSockaddrLinklayer)(unsafe.Pointer(rsa))
|
|
sa := new(SockaddrLinklayer)
|
|
sa.Protocol = pp.Protocol
|
|
sa.Ifindex = int(pp.Ifindex)
|
|
sa.Hatype = pp.Hatype
|
|
sa.Pkttype = pp.Pkttype
|
|
sa.Halen = pp.Halen
|
|
for i := 0; i < len(sa.Addr); i++ {
|
|
sa.Addr[i] = pp.Addr[i]
|
|
}
|
|
return sa, nil
|
|
|
|
case AF_UNIX:
|
|
pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
|
|
sa := new(SockaddrUnix)
|
|
if pp.Path[0] == 0 {
|
|
// "Abstract" Unix domain socket.
|
|
// Rewrite leading NUL as @ for textual display.
|
|
// (This is the standard convention.)
|
|
// Not friendly to overwrite in place,
|
|
// but the callers below don't care.
|
|
pp.Path[0] = '@'
|
|
}
|
|
|
|
// Assume path ends at NUL.
|
|
// This is not technically the Linux semantics for
|
|
// abstract Unix domain sockets--they are supposed
|
|
// to be uninterpreted fixed-size binary blobs--but
|
|
// everyone uses this convention.
|
|
n := 0
|
|
for n < len(pp.Path) && pp.Path[n] != 0 {
|
|
n++
|
|
}
|
|
bytes := (*[len(pp.Path)]byte)(unsafe.Pointer(&pp.Path[0]))[0:n]
|
|
sa.Name = string(bytes)
|
|
return sa, nil
|
|
|
|
case AF_INET:
|
|
proto, err := socketProtocol(fd)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
switch proto {
|
|
case IPPROTO_L2TP:
|
|
pp := (*RawSockaddrL2TPIP)(unsafe.Pointer(rsa))
|
|
sa := new(SockaddrL2TPIP)
|
|
sa.ConnId = pp.Conn_id
|
|
for i := 0; i < len(sa.Addr); i++ {
|
|
sa.Addr[i] = pp.Addr[i]
|
|
}
|
|
return sa, nil
|
|
default:
|
|
pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
|
|
sa := new(SockaddrInet4)
|
|
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
|
|
sa.Port = int(p[0])<<8 + int(p[1])
|
|
for i := 0; i < len(sa.Addr); i++ {
|
|
sa.Addr[i] = pp.Addr[i]
|
|
}
|
|
return sa, nil
|
|
}
|
|
|
|
case AF_INET6:
|
|
proto, err := socketProtocol(fd)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
switch proto {
|
|
case IPPROTO_L2TP:
|
|
pp := (*RawSockaddrL2TPIP6)(unsafe.Pointer(rsa))
|
|
sa := new(SockaddrL2TPIP6)
|
|
sa.ConnId = pp.Conn_id
|
|
sa.ZoneId = pp.Scope_id
|
|
for i := 0; i < len(sa.Addr); i++ {
|
|
sa.Addr[i] = pp.Addr[i]
|
|
}
|
|
return sa, nil
|
|
default:
|
|
pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
|
|
sa := new(SockaddrInet6)
|
|
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
|
|
sa.Port = int(p[0])<<8 + int(p[1])
|
|
sa.ZoneId = pp.Scope_id
|
|
for i := 0; i < len(sa.Addr); i++ {
|
|
sa.Addr[i] = pp.Addr[i]
|
|
}
|
|
return sa, nil
|
|
}
|
|
|
|
case AF_VSOCK:
|
|
pp := (*RawSockaddrVM)(unsafe.Pointer(rsa))
|
|
sa := &SockaddrVM{
|
|
CID: pp.Cid,
|
|
Port: pp.Port,
|
|
}
|
|
return sa, nil
|
|
case AF_BLUETOOTH:
|
|
proto, err := socketProtocol(fd)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// only BTPROTO_L2CAP and BTPROTO_RFCOMM can accept connections
|
|
switch proto {
|
|
case BTPROTO_L2CAP:
|
|
pp := (*RawSockaddrL2)(unsafe.Pointer(rsa))
|
|
sa := &SockaddrL2{
|
|
PSM: pp.Psm,
|
|
CID: pp.Cid,
|
|
Addr: pp.Bdaddr,
|
|
AddrType: pp.Bdaddr_type,
|
|
}
|
|
return sa, nil
|
|
case BTPROTO_RFCOMM:
|
|
pp := (*RawSockaddrRFCOMM)(unsafe.Pointer(rsa))
|
|
sa := &SockaddrRFCOMM{
|
|
Channel: pp.Channel,
|
|
Addr: pp.Bdaddr,
|
|
}
|
|
return sa, nil
|
|
}
|
|
case AF_XDP:
|
|
pp := (*RawSockaddrXDP)(unsafe.Pointer(rsa))
|
|
sa := &SockaddrXDP{
|
|
Flags: pp.Flags,
|
|
Ifindex: pp.Ifindex,
|
|
QueueID: pp.Queue_id,
|
|
SharedUmemFD: pp.Shared_umem_fd,
|
|
}
|
|
return sa, nil
|
|
case AF_PPPOX:
|
|
pp := (*RawSockaddrPPPoX)(unsafe.Pointer(rsa))
|
|
if binary.BigEndian.Uint32(pp[2:6]) != px_proto_oe {
|
|
return nil, EINVAL
|
|
}
|
|
sa := &SockaddrPPPoE{
|
|
SID: binary.BigEndian.Uint16(pp[6:8]),
|
|
Remote: pp[8:14],
|
|
}
|
|
for i := 14; i < 14+IFNAMSIZ; i++ {
|
|
if pp[i] == 0 {
|
|
sa.Dev = string(pp[14:i])
|
|
break
|
|
}
|
|
}
|
|
return sa, nil
|
|
case AF_TIPC:
|
|
pp := (*RawSockaddrTIPC)(unsafe.Pointer(rsa))
|
|
|
|
sa := &SockaddrTIPC{
|
|
Scope: int(pp.Scope),
|
|
}
|
|
|
|
// Determine which union variant is present in pp.Addr by checking
|
|
// pp.Addrtype.
|
|
switch pp.Addrtype {
|
|
case TIPC_SERVICE_RANGE:
|
|
sa.Addr = (*TIPCServiceRange)(unsafe.Pointer(&pp.Addr))
|
|
case TIPC_SERVICE_ADDR:
|
|
sa.Addr = (*TIPCServiceName)(unsafe.Pointer(&pp.Addr))
|
|
case TIPC_SOCKET_ADDR:
|
|
sa.Addr = (*TIPCSocketAddr)(unsafe.Pointer(&pp.Addr))
|
|
default:
|
|
return nil, EINVAL
|
|
}
|
|
|
|
return sa, nil
|
|
case AF_IUCV:
|
|
pp := (*RawSockaddrIUCV)(unsafe.Pointer(rsa))
|
|
|
|
var user [8]byte
|
|
var name [8]byte
|
|
|
|
for i := 0; i < 8; i++ {
|
|
user[i] = byte(pp.User_id[i])
|
|
name[i] = byte(pp.Name[i])
|
|
}
|
|
|
|
sa := &SockaddrIUCV{
|
|
UserID: string(user[:]),
|
|
Name: string(name[:]),
|
|
}
|
|
return sa, nil
|
|
|
|
case AF_CAN:
|
|
proto, err := socketProtocol(fd)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
pp := (*RawSockaddrCAN)(unsafe.Pointer(rsa))
|
|
|
|
switch proto {
|
|
case CAN_J1939:
|
|
sa := &SockaddrCANJ1939{
|
|
Ifindex: int(pp.Ifindex),
|
|
}
|
|
name := (*[8]byte)(unsafe.Pointer(&sa.Name))
|
|
for i := 0; i < 8; i++ {
|
|
name[i] = pp.Addr[i]
|
|
}
|
|
pgn := (*[4]byte)(unsafe.Pointer(&sa.PGN))
|
|
for i := 0; i < 4; i++ {
|
|
pgn[i] = pp.Addr[i+8]
|
|
}
|
|
addr := (*[1]byte)(unsafe.Pointer(&sa.Addr))
|
|
addr[0] = pp.Addr[12]
|
|
return sa, nil
|
|
default:
|
|
sa := &SockaddrCAN{
|
|
Ifindex: int(pp.Ifindex),
|
|
}
|
|
rx := (*[4]byte)(unsafe.Pointer(&sa.RxID))
|
|
for i := 0; i < 4; i++ {
|
|
rx[i] = pp.Addr[i]
|
|
}
|
|
tx := (*[4]byte)(unsafe.Pointer(&sa.TxID))
|
|
for i := 0; i < 4; i++ {
|
|
tx[i] = pp.Addr[i+4]
|
|
}
|
|
return sa, nil
|
|
}
|
|
}
|
|
return nil, EAFNOSUPPORT
|
|
}
|
|
|
|
func Accept(fd int) (nfd int, sa Sockaddr, err error) {
|
|
var rsa RawSockaddrAny
|
|
var len _Socklen = SizeofSockaddrAny
|
|
nfd, err = accept(fd, &rsa, &len)
|
|
if err != nil {
|
|
return
|
|
}
|
|
sa, err = anyToSockaddr(fd, &rsa)
|
|
if err != nil {
|
|
Close(nfd)
|
|
nfd = 0
|
|
}
|
|
return
|
|
}
|
|
|
|
func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) {
|
|
var rsa RawSockaddrAny
|
|
var len _Socklen = SizeofSockaddrAny
|
|
nfd, err = accept4(fd, &rsa, &len, flags)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if len > SizeofSockaddrAny {
|
|
panic("RawSockaddrAny too small")
|
|
}
|
|
sa, err = anyToSockaddr(fd, &rsa)
|
|
if err != nil {
|
|
Close(nfd)
|
|
nfd = 0
|
|
}
|
|
return
|
|
}
|
|
|
|
func Getsockname(fd int) (sa Sockaddr, err error) {
|
|
var rsa RawSockaddrAny
|
|
var len _Socklen = SizeofSockaddrAny
|
|
if err = getsockname(fd, &rsa, &len); err != nil {
|
|
return
|
|
}
|
|
return anyToSockaddr(fd, &rsa)
|
|
}
|
|
|
|
func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) {
|
|
var value IPMreqn
|
|
vallen := _Socklen(SizeofIPMreqn)
|
|
err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
|
|
return &value, err
|
|
}
|
|
|
|
func GetsockoptUcred(fd, level, opt int) (*Ucred, error) {
|
|
var value Ucred
|
|
vallen := _Socklen(SizeofUcred)
|
|
err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
|
|
return &value, err
|
|
}
|
|
|
|
func GetsockoptTCPInfo(fd, level, opt int) (*TCPInfo, error) {
|
|
var value TCPInfo
|
|
vallen := _Socklen(SizeofTCPInfo)
|
|
err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
|
|
return &value, err
|
|
}
|
|
|
|
// GetsockoptString returns the string value of the socket option opt for the
|
|
// socket associated with fd at the given socket level.
|
|
func GetsockoptString(fd, level, opt int) (string, error) {
|
|
buf := make([]byte, 256)
|
|
vallen := _Socklen(len(buf))
|
|
err := getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen)
|
|
if err != nil {
|
|
if err == ERANGE {
|
|
buf = make([]byte, vallen)
|
|
err = getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen)
|
|
}
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
}
|
|
return string(buf[:vallen-1]), nil
|
|
}
|
|
|
|
func GetsockoptTpacketStats(fd, level, opt int) (*TpacketStats, error) {
|
|
var value TpacketStats
|
|
vallen := _Socklen(SizeofTpacketStats)
|
|
err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
|
|
return &value, err
|
|
}
|
|
|
|
func GetsockoptTpacketStatsV3(fd, level, opt int) (*TpacketStatsV3, error) {
|
|
var value TpacketStatsV3
|
|
vallen := _Socklen(SizeofTpacketStatsV3)
|
|
err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
|
|
return &value, err
|
|
}
|
|
|
|
func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) {
|
|
return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq))
|
|
}
|
|
|
|
func SetsockoptPacketMreq(fd, level, opt int, mreq *PacketMreq) error {
|
|
return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq))
|
|
}
|
|
|
|
// SetsockoptSockFprog attaches a classic BPF or an extended BPF program to a
|
|
// socket to filter incoming packets. See 'man 7 socket' for usage information.
|
|
func SetsockoptSockFprog(fd, level, opt int, fprog *SockFprog) error {
|
|
return setsockopt(fd, level, opt, unsafe.Pointer(fprog), unsafe.Sizeof(*fprog))
|
|
}
|
|
|
|
func SetsockoptCanRawFilter(fd, level, opt int, filter []CanFilter) error {
|
|
var p unsafe.Pointer
|
|
if len(filter) > 0 {
|
|
p = unsafe.Pointer(&filter[0])
|
|
}
|
|
return setsockopt(fd, level, opt, p, uintptr(len(filter)*SizeofCanFilter))
|
|
}
|
|
|
|
func SetsockoptTpacketReq(fd, level, opt int, tp *TpacketReq) error {
|
|
return setsockopt(fd, level, opt, unsafe.Pointer(tp), unsafe.Sizeof(*tp))
|
|
}
|
|
|
|
func SetsockoptTpacketReq3(fd, level, opt int, tp *TpacketReq3) error {
|
|
return setsockopt(fd, level, opt, unsafe.Pointer(tp), unsafe.Sizeof(*tp))
|
|
}
|
|
|
|
// Keyctl Commands (http://man7.org/linux/man-pages/man2/keyctl.2.html)
|
|
|
|
// KeyctlInt calls keyctl commands in which each argument is an int.
|
|
// These commands are KEYCTL_REVOKE, KEYCTL_CHOWN, KEYCTL_CLEAR, KEYCTL_LINK,
|
|
// KEYCTL_UNLINK, KEYCTL_NEGATE, KEYCTL_SET_REQKEY_KEYRING, KEYCTL_SET_TIMEOUT,
|
|
// KEYCTL_ASSUME_AUTHORITY, KEYCTL_SESSION_TO_PARENT, KEYCTL_REJECT,
|
|
// KEYCTL_INVALIDATE, and KEYCTL_GET_PERSISTENT.
|
|
//sys KeyctlInt(cmd int, arg2 int, arg3 int, arg4 int, arg5 int) (ret int, err error) = SYS_KEYCTL
|
|
|
|
// KeyctlBuffer calls keyctl commands in which the third and fourth
|
|
// arguments are a buffer and its length, respectively.
|
|
// These commands are KEYCTL_UPDATE, KEYCTL_READ, and KEYCTL_INSTANTIATE.
|
|
//sys KeyctlBuffer(cmd int, arg2 int, buf []byte, arg5 int) (ret int, err error) = SYS_KEYCTL
|
|
|
|
// KeyctlString calls keyctl commands which return a string.
|
|
// These commands are KEYCTL_DESCRIBE and KEYCTL_GET_SECURITY.
|
|
func KeyctlString(cmd int, id int) (string, error) {
|
|
// We must loop as the string data may change in between the syscalls.
|
|
// We could allocate a large buffer here to reduce the chance that the
|
|
// syscall needs to be called twice; however, this is unnecessary as
|
|
// the performance loss is negligible.
|
|
var buffer []byte
|
|
for {
|
|
// Try to fill the buffer with data
|
|
length, err := KeyctlBuffer(cmd, id, buffer, 0)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
// Check if the data was written
|
|
if length <= len(buffer) {
|
|
// Exclude the null terminator
|
|
return string(buffer[:length-1]), nil
|
|
}
|
|
|
|
// Make a bigger buffer if needed
|
|
buffer = make([]byte, length)
|
|
}
|
|
}
|
|
|
|
// Keyctl commands with special signatures.
|
|
|
|
// KeyctlGetKeyringID implements the KEYCTL_GET_KEYRING_ID command.
|
|
// See the full documentation at:
|
|
// http://man7.org/linux/man-pages/man3/keyctl_get_keyring_ID.3.html
|
|
func KeyctlGetKeyringID(id int, create bool) (ringid int, err error) {
|
|
createInt := 0
|
|
if create {
|
|
createInt = 1
|
|
}
|
|
return KeyctlInt(KEYCTL_GET_KEYRING_ID, id, createInt, 0, 0)
|
|
}
|
|
|
|
// KeyctlSetperm implements the KEYCTL_SETPERM command. The perm value is the
|
|
// key handle permission mask as described in the "keyctl setperm" section of
|
|
// http://man7.org/linux/man-pages/man1/keyctl.1.html.
|
|
// See the full documentation at:
|
|
// http://man7.org/linux/man-pages/man3/keyctl_setperm.3.html
|
|
func KeyctlSetperm(id int, perm uint32) error {
|
|
_, err := KeyctlInt(KEYCTL_SETPERM, id, int(perm), 0, 0)
|
|
return err
|
|
}
|
|
|
|
//sys keyctlJoin(cmd int, arg2 string) (ret int, err error) = SYS_KEYCTL
|
|
|
|
// KeyctlJoinSessionKeyring implements the KEYCTL_JOIN_SESSION_KEYRING command.
|
|
// See the full documentation at:
|
|
// http://man7.org/linux/man-pages/man3/keyctl_join_session_keyring.3.html
|
|
func KeyctlJoinSessionKeyring(name string) (ringid int, err error) {
|
|
return keyctlJoin(KEYCTL_JOIN_SESSION_KEYRING, name)
|
|
}
|
|
|
|
//sys keyctlSearch(cmd int, arg2 int, arg3 string, arg4 string, arg5 int) (ret int, err error) = SYS_KEYCTL
|
|
|
|
// KeyctlSearch implements the KEYCTL_SEARCH command.
|
|
// See the full documentation at:
|
|
// http://man7.org/linux/man-pages/man3/keyctl_search.3.html
|
|
func KeyctlSearch(ringid int, keyType, description string, destRingid int) (id int, err error) {
|
|
return keyctlSearch(KEYCTL_SEARCH, ringid, keyType, description, destRingid)
|
|
}
|
|
|
|
//sys keyctlIOV(cmd int, arg2 int, payload []Iovec, arg5 int) (err error) = SYS_KEYCTL
|
|
|
|
// KeyctlInstantiateIOV implements the KEYCTL_INSTANTIATE_IOV command. This
|
|
// command is similar to KEYCTL_INSTANTIATE, except that the payload is a slice
|
|
// of Iovec (each of which represents a buffer) instead of a single buffer.
|
|
// See the full documentation at:
|
|
// http://man7.org/linux/man-pages/man3/keyctl_instantiate_iov.3.html
|
|
func KeyctlInstantiateIOV(id int, payload []Iovec, ringid int) error {
|
|
return keyctlIOV(KEYCTL_INSTANTIATE_IOV, id, payload, ringid)
|
|
}
|
|
|
|
//sys keyctlDH(cmd int, arg2 *KeyctlDHParams, buf []byte) (ret int, err error) = SYS_KEYCTL
|
|
|
|
// KeyctlDHCompute implements the KEYCTL_DH_COMPUTE command. This command
|
|
// computes a Diffie-Hellman shared secret based on the provide params. The
|
|
// secret is written to the provided buffer and the returned size is the number
|
|
// of bytes written (returning an error if there is insufficient space in the
|
|
// buffer). If a nil buffer is passed in, this function returns the minimum
|
|
// buffer length needed to store the appropriate data. Note that this differs
|
|
// from KEYCTL_READ's behavior which always returns the requested payload size.
|
|
// See the full documentation at:
|
|
// http://man7.org/linux/man-pages/man3/keyctl_dh_compute.3.html
|
|
func KeyctlDHCompute(params *KeyctlDHParams, buffer []byte) (size int, err error) {
|
|
return keyctlDH(KEYCTL_DH_COMPUTE, params, buffer)
|
|
}
|
|
|
|
// KeyctlRestrictKeyring implements the KEYCTL_RESTRICT_KEYRING command. This
|
|
// command limits the set of keys that can be linked to the keyring, regardless
|
|
// of keyring permissions. The command requires the "setattr" permission.
|
|
//
|
|
// When called with an empty keyType the command locks the keyring, preventing
|
|
// any further keys from being linked to the keyring.
|
|
//
|
|
// The "asymmetric" keyType defines restrictions requiring key payloads to be
|
|
// DER encoded X.509 certificates signed by keys in another keyring. Restrictions
|
|
// for "asymmetric" include "builtin_trusted", "builtin_and_secondary_trusted",
|
|
// "key_or_keyring:<key>", and "key_or_keyring:<key>:chain".
|
|
//
|
|
// As of Linux 4.12, only the "asymmetric" keyType defines type-specific
|
|
// restrictions.
|
|
//
|
|
// See the full documentation at:
|
|
// http://man7.org/linux/man-pages/man3/keyctl_restrict_keyring.3.html
|
|
// http://man7.org/linux/man-pages/man2/keyctl.2.html
|
|
func KeyctlRestrictKeyring(ringid int, keyType string, restriction string) error {
|
|
if keyType == "" {
|
|
return keyctlRestrictKeyring(KEYCTL_RESTRICT_KEYRING, ringid)
|
|
}
|
|
return keyctlRestrictKeyringByType(KEYCTL_RESTRICT_KEYRING, ringid, keyType, restriction)
|
|
}
|
|
|
|
//sys keyctlRestrictKeyringByType(cmd int, arg2 int, keyType string, restriction string) (err error) = SYS_KEYCTL
|
|
//sys keyctlRestrictKeyring(cmd int, arg2 int) (err error) = SYS_KEYCTL
|
|
|
|
func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
|
|
var msg Msghdr
|
|
var rsa RawSockaddrAny
|
|
msg.Name = (*byte)(unsafe.Pointer(&rsa))
|
|
msg.Namelen = uint32(SizeofSockaddrAny)
|
|
var iov Iovec
|
|
if len(p) > 0 {
|
|
iov.Base = &p[0]
|
|
iov.SetLen(len(p))
|
|
}
|
|
var dummy byte
|
|
if len(oob) > 0 {
|
|
if len(p) == 0 {
|
|
var sockType int
|
|
sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE)
|
|
if err != nil {
|
|
return
|
|
}
|
|
// receive at least one normal byte
|
|
if sockType != SOCK_DGRAM {
|
|
iov.Base = &dummy
|
|
iov.SetLen(1)
|
|
}
|
|
}
|
|
msg.Control = &oob[0]
|
|
msg.SetControllen(len(oob))
|
|
}
|
|
msg.Iov = &iov
|
|
msg.Iovlen = 1
|
|
if n, err = recvmsg(fd, &msg, flags); err != nil {
|
|
return
|
|
}
|
|
oobn = int(msg.Controllen)
|
|
recvflags = int(msg.Flags)
|
|
// source address is only specified if the socket is unconnected
|
|
if rsa.Addr.Family != AF_UNSPEC {
|
|
from, err = anyToSockaddr(fd, &rsa)
|
|
}
|
|
return
|
|
}
|
|
|
|
func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) {
|
|
_, err = SendmsgN(fd, p, oob, to, flags)
|
|
return
|
|
}
|
|
|
|
func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) {
|
|
var ptr unsafe.Pointer
|
|
var salen _Socklen
|
|
if to != nil {
|
|
var err error
|
|
ptr, salen, err = to.sockaddr()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
}
|
|
var msg Msghdr
|
|
msg.Name = (*byte)(ptr)
|
|
msg.Namelen = uint32(salen)
|
|
var iov Iovec
|
|
if len(p) > 0 {
|
|
iov.Base = &p[0]
|
|
iov.SetLen(len(p))
|
|
}
|
|
var dummy byte
|
|
if len(oob) > 0 {
|
|
if len(p) == 0 {
|
|
var sockType int
|
|
sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
// send at least one normal byte
|
|
if sockType != SOCK_DGRAM {
|
|
iov.Base = &dummy
|
|
iov.SetLen(1)
|
|
}
|
|
}
|
|
msg.Control = &oob[0]
|
|
msg.SetControllen(len(oob))
|
|
}
|
|
msg.Iov = &iov
|
|
msg.Iovlen = 1
|
|
if n, err = sendmsg(fd, &msg, flags); err != nil {
|
|
return 0, err
|
|
}
|
|
if len(oob) > 0 && len(p) == 0 {
|
|
n = 0
|
|
}
|
|
return n, nil
|
|
}
|
|
|
|
// BindToDevice binds the socket associated with fd to device.
|
|
func BindToDevice(fd int, device string) (err error) {
|
|
return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device)
|
|
}
|
|
|
|
//sys ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
|
|
|
|
func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err error) {
|
|
// The peek requests are machine-size oriented, so we wrap it
|
|
// to retrieve arbitrary-length data.
|
|
|
|
// The ptrace syscall differs from glibc's ptrace.
|
|
// Peeks returns the word in *data, not as the return value.
|
|
|
|
var buf [SizeofPtr]byte
|
|
|
|
// Leading edge. PEEKTEXT/PEEKDATA don't require aligned
|
|
// access (PEEKUSER warns that it might), but if we don't
|
|
// align our reads, we might straddle an unmapped page
|
|
// boundary and not get the bytes leading up to the page
|
|
// boundary.
|
|
n := 0
|
|
if addr%SizeofPtr != 0 {
|
|
err = ptrace(req, pid, addr-addr%SizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
n += copy(out, buf[addr%SizeofPtr:])
|
|
out = out[n:]
|
|
}
|
|
|
|
// Remainder.
|
|
for len(out) > 0 {
|
|
// We use an internal buffer to guarantee alignment.
|
|
// It's not documented if this is necessary, but we're paranoid.
|
|
err = ptrace(req, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
|
|
if err != nil {
|
|
return n, err
|
|
}
|
|
copied := copy(out, buf[0:])
|
|
n += copied
|
|
out = out[copied:]
|
|
}
|
|
|
|
return n, nil
|
|
}
|
|
|
|
func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) {
|
|
return ptracePeek(PTRACE_PEEKTEXT, pid, addr, out)
|
|
}
|
|
|
|
func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) {
|
|
return ptracePeek(PTRACE_PEEKDATA, pid, addr, out)
|
|
}
|
|
|
|
func PtracePeekUser(pid int, addr uintptr, out []byte) (count int, err error) {
|
|
return ptracePeek(PTRACE_PEEKUSR, pid, addr, out)
|
|
}
|
|
|
|
func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, err error) {
|
|
// As for ptracePeek, we need to align our accesses to deal
|
|
// with the possibility of straddling an invalid page.
|
|
|
|
// Leading edge.
|
|
n := 0
|
|
if addr%SizeofPtr != 0 {
|
|
var buf [SizeofPtr]byte
|
|
err = ptrace(peekReq, pid, addr-addr%SizeofPtr, uintptr(unsafe.Pointer(&buf[0])))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
n += copy(buf[addr%SizeofPtr:], data)
|
|
word := *((*uintptr)(unsafe.Pointer(&buf[0])))
|
|
err = ptrace(pokeReq, pid, addr-addr%SizeofPtr, word)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
data = data[n:]
|
|
}
|
|
|
|
// Interior.
|
|
for len(data) > SizeofPtr {
|
|
word := *((*uintptr)(unsafe.Pointer(&data[0])))
|
|
err = ptrace(pokeReq, pid, addr+uintptr(n), word)
|
|
if err != nil {
|
|
return n, err
|
|
}
|
|
n += SizeofPtr
|
|
data = data[SizeofPtr:]
|
|
}
|
|
|
|
// Trailing edge.
|
|
if len(data) > 0 {
|
|
var buf [SizeofPtr]byte
|
|
err = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0])))
|
|
if err != nil {
|
|
return n, err
|
|
}
|
|
copy(buf[0:], data)
|
|
word := *((*uintptr)(unsafe.Pointer(&buf[0])))
|
|
err = ptrace(pokeReq, pid, addr+uintptr(n), word)
|
|
if err != nil {
|
|
return n, err
|
|
}
|
|
n += len(data)
|
|
}
|
|
|
|
return n, nil
|
|
}
|
|
|
|
func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) {
|
|
return ptracePoke(PTRACE_POKETEXT, PTRACE_PEEKTEXT, pid, addr, data)
|
|
}
|
|
|
|
func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) {
|
|
return ptracePoke(PTRACE_POKEDATA, PTRACE_PEEKDATA, pid, addr, data)
|
|
}
|
|
|
|
func PtracePokeUser(pid int, addr uintptr, data []byte) (count int, err error) {
|
|
return ptracePoke(PTRACE_POKEUSR, PTRACE_PEEKUSR, pid, addr, data)
|
|
}
|
|
|
|
func PtraceGetRegs(pid int, regsout *PtraceRegs) (err error) {
|
|
return ptrace(PTRACE_GETREGS, pid, 0, uintptr(unsafe.Pointer(regsout)))
|
|
}
|
|
|
|
func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) {
|
|
return ptrace(PTRACE_SETREGS, pid, 0, uintptr(unsafe.Pointer(regs)))
|
|
}
|
|
|
|
func PtraceSetOptions(pid int, options int) (err error) {
|
|
return ptrace(PTRACE_SETOPTIONS, pid, 0, uintptr(options))
|
|
}
|
|
|
|
func PtraceGetEventMsg(pid int) (msg uint, err error) {
|
|
var data _C_long
|
|
err = ptrace(PTRACE_GETEVENTMSG, pid, 0, uintptr(unsafe.Pointer(&data)))
|
|
msg = uint(data)
|
|
return
|
|
}
|
|
|
|
func PtraceCont(pid int, signal int) (err error) {
|
|
return ptrace(PTRACE_CONT, pid, 0, uintptr(signal))
|
|
}
|
|
|
|
func PtraceSyscall(pid int, signal int) (err error) {
|
|
return ptrace(PTRACE_SYSCALL, pid, 0, uintptr(signal))
|
|
}
|
|
|
|
func PtraceSingleStep(pid int) (err error) { return ptrace(PTRACE_SINGLESTEP, pid, 0, 0) }
|
|
|
|
func PtraceInterrupt(pid int) (err error) { return ptrace(PTRACE_INTERRUPT, pid, 0, 0) }
|
|
|
|
func PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, pid, 0, 0) }
|
|
|
|
func PtraceSeize(pid int) (err error) { return ptrace(PTRACE_SEIZE, pid, 0, 0) }
|
|
|
|
func PtraceDetach(pid int) (err error) { return ptrace(PTRACE_DETACH, pid, 0, 0) }
|
|
|
|
//sys reboot(magic1 uint, magic2 uint, cmd int, arg string) (err error)
|
|
|
|
func Reboot(cmd int) (err error) {
|
|
return reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, cmd, "")
|
|
}
|
|
|
|
func direntIno(buf []byte) (uint64, bool) {
|
|
return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino))
|
|
}
|
|
|
|
func direntReclen(buf []byte) (uint64, bool) {
|
|
return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen))
|
|
}
|
|
|
|
func direntNamlen(buf []byte) (uint64, bool) {
|
|
reclen, ok := direntReclen(buf)
|
|
if !ok {
|
|
return 0, false
|
|
}
|
|
return reclen - uint64(unsafe.Offsetof(Dirent{}.Name)), true
|
|
}
|
|
|
|
//sys mount(source string, target string, fstype string, flags uintptr, data *byte) (err error)
|
|
|
|
func Mount(source string, target string, fstype string, flags uintptr, data string) (err error) {
|
|
// Certain file systems get rather angry and EINVAL if you give
|
|
// them an empty string of data, rather than NULL.
|
|
if data == "" {
|
|
return mount(source, target, fstype, flags, nil)
|
|
}
|
|
datap, err := BytePtrFromString(data)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return mount(source, target, fstype, flags, datap)
|
|
}
|
|
|
|
func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
|
|
if raceenabled {
|
|
raceReleaseMerge(unsafe.Pointer(&ioSync))
|
|
}
|
|
return sendfile(outfd, infd, offset, count)
|
|
}
|
|
|
|
// Sendto
|
|
// Recvfrom
|
|
// Socketpair
|
|
|
|
/*
|
|
* Direct access
|
|
*/
|
|
//sys Acct(path string) (err error)
|
|
//sys AddKey(keyType string, description string, payload []byte, ringid int) (id int, err error)
|
|
//sys Adjtimex(buf *Timex) (state int, err error)
|
|
//sysnb Capget(hdr *CapUserHeader, data *CapUserData) (err error)
|
|
//sysnb Capset(hdr *CapUserHeader, data *CapUserData) (err error)
|
|
//sys Chdir(path string) (err error)
|
|
//sys Chroot(path string) (err error)
|
|
//sys ClockGetres(clockid int32, res *Timespec) (err error)
|
|
//sys ClockGettime(clockid int32, time *Timespec) (err error)
|
|
//sys ClockNanosleep(clockid int32, flags int, request *Timespec, remain *Timespec) (err error)
|
|
//sys Close(fd int) (err error)
|
|
//sys CloseRange(first uint, last uint, flags uint) (err error)
|
|
//sys CopyFileRange(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error)
|
|
//sys DeleteModule(name string, flags int) (err error)
|
|
//sys Dup(oldfd int) (fd int, err error)
|
|
|
|
func Dup2(oldfd, newfd int) error {
|
|
// Android O and newer blocks dup2; riscv and arm64 don't implement dup2.
|
|
if runtime.GOOS == "android" || runtime.GOARCH == "riscv64" || runtime.GOARCH == "arm64" {
|
|
return Dup3(oldfd, newfd, 0)
|
|
}
|
|
return dup2(oldfd, newfd)
|
|
}
|
|
|
|
//sys Dup3(oldfd int, newfd int, flags int) (err error)
|
|
//sysnb EpollCreate1(flag int) (fd int, err error)
|
|
//sysnb EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error)
|
|
//sys Eventfd(initval uint, flags int) (fd int, err error) = SYS_EVENTFD2
|
|
//sys Exit(code int) = SYS_EXIT_GROUP
|
|
//sys Fallocate(fd int, mode uint32, off int64, len int64) (err error)
|
|
//sys Fchdir(fd int) (err error)
|
|
//sys Fchmod(fd int, mode uint32) (err error)
|
|
//sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)
|
|
//sys Fdatasync(fd int) (err error)
|
|
//sys Fgetxattr(fd int, attr string, dest []byte) (sz int, err error)
|
|
//sys FinitModule(fd int, params string, flags int) (err error)
|
|
//sys Flistxattr(fd int, dest []byte) (sz int, err error)
|
|
//sys Flock(fd int, how int) (err error)
|
|
//sys Fremovexattr(fd int, attr string) (err error)
|
|
//sys Fsetxattr(fd int, attr string, dest []byte, flags int) (err error)
|
|
//sys Fsync(fd int) (err error)
|
|
//sys Getdents(fd int, buf []byte) (n int, err error) = SYS_GETDENTS64
|
|
//sysnb Getpgid(pid int) (pgid int, err error)
|
|
|
|
func Getpgrp() (pid int) {
|
|
pid, _ = Getpgid(0)
|
|
return
|
|
}
|
|
|
|
//sysnb Getpid() (pid int)
|
|
//sysnb Getppid() (ppid int)
|
|
//sys Getpriority(which int, who int) (prio int, err error)
|
|
//sys Getrandom(buf []byte, flags int) (n int, err error)
|
|
//sysnb Getrusage(who int, rusage *Rusage) (err error)
|
|
//sysnb Getsid(pid int) (sid int, err error)
|
|
//sysnb Gettid() (tid int)
|
|
//sys Getxattr(path string, attr string, dest []byte) (sz int, err error)
|
|
//sys InitModule(moduleImage []byte, params string) (err error)
|
|
//sys InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error)
|
|
//sysnb InotifyInit1(flags int) (fd int, err error)
|
|
//sysnb InotifyRmWatch(fd int, watchdesc uint32) (success int, err error)
|
|
//sysnb Kill(pid int, sig syscall.Signal) (err error)
|
|
//sys Klogctl(typ int, buf []byte) (n int, err error) = SYS_SYSLOG
|
|
//sys Lgetxattr(path string, attr string, dest []byte) (sz int, err error)
|
|
//sys Listxattr(path string, dest []byte) (sz int, err error)
|
|
//sys Llistxattr(path string, dest []byte) (sz int, err error)
|
|
//sys Lremovexattr(path string, attr string) (err error)
|
|
//sys Lsetxattr(path string, attr string, data []byte, flags int) (err error)
|
|
//sys MemfdCreate(name string, flags int) (fd int, err error)
|
|
//sys Mkdirat(dirfd int, path string, mode uint32) (err error)
|
|
//sys Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
|
|
//sys Nanosleep(time *Timespec, leftover *Timespec) (err error)
|
|
//sys PerfEventOpen(attr *PerfEventAttr, pid int, cpu int, groupFd int, flags int) (fd int, err error)
|
|
//sys PivotRoot(newroot string, putold string) (err error) = SYS_PIVOT_ROOT
|
|
//sysnb prlimit(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) = SYS_PRLIMIT64
|
|
//sys Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (err error)
|
|
//sys Pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *Sigset_t) (n int, err error) = SYS_PSELECT6
|
|
//sys read(fd int, p []byte) (n int, err error)
|
|
//sys Removexattr(path string, attr string) (err error)
|
|
//sys Renameat2(olddirfd int, oldpath string, newdirfd int, newpath string, flags uint) (err error)
|
|
//sys RequestKey(keyType string, description string, callback string, destRingid int) (id int, err error)
|
|
//sys Setdomainname(p []byte) (err error)
|
|
//sys Sethostname(p []byte) (err error)
|
|
//sysnb Setpgid(pid int, pgid int) (err error)
|
|
//sysnb Setsid() (pid int, err error)
|
|
//sysnb Settimeofday(tv *Timeval) (err error)
|
|
//sys Setns(fd int, nstype int) (err error)
|
|
|
|
// PrctlRetInt performs a prctl operation specified by option and further
|
|
// optional arguments arg2 through arg5 depending on option. It returns a
|
|
// non-negative integer that is returned by the prctl syscall.
|
|
func PrctlRetInt(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (int, error) {
|
|
ret, _, err := Syscall6(SYS_PRCTL, uintptr(option), uintptr(arg2), uintptr(arg3), uintptr(arg4), uintptr(arg5), 0)
|
|
if err != 0 {
|
|
return 0, err
|
|
}
|
|
return int(ret), nil
|
|
}
|
|
|
|
// issue 1435.
|
|
// On linux Setuid and Setgid only affects the current thread, not the process.
|
|
// This does not match what most callers expect so we must return an error
|
|
// here rather than letting the caller think that the call succeeded.
|
|
|
|
func Setuid(uid int) (err error) {
|
|
return EOPNOTSUPP
|
|
}
|
|
|
|
func Setgid(uid int) (err error) {
|
|
return EOPNOTSUPP
|
|
}
|
|
|
|
// SetfsgidRetGid sets fsgid for current thread and returns previous fsgid set.
|
|
// setfsgid(2) will return a non-nil error only if its caller lacks CAP_SETUID capability.
|
|
// If the call fails due to other reasons, current fsgid will be returned.
|
|
func SetfsgidRetGid(gid int) (int, error) {
|
|
return setfsgid(gid)
|
|
}
|
|
|
|
// SetfsuidRetUid sets fsuid for current thread and returns previous fsuid set.
|
|
// setfsgid(2) will return a non-nil error only if its caller lacks CAP_SETUID capability
|
|
// If the call fails due to other reasons, current fsuid will be returned.
|
|
func SetfsuidRetUid(uid int) (int, error) {
|
|
return setfsuid(uid)
|
|
}
|
|
|
|
func Setfsgid(gid int) error {
|
|
_, err := setfsgid(gid)
|
|
return err
|
|
}
|
|
|
|
func Setfsuid(uid int) error {
|
|
_, err := setfsuid(uid)
|
|
return err
|
|
}
|
|
|
|
func Signalfd(fd int, sigmask *Sigset_t, flags int) (newfd int, err error) {
|
|
return signalfd(fd, sigmask, _C__NSIG/8, flags)
|
|
}
|
|
|
|
//sys Setpriority(which int, who int, prio int) (err error)
|
|
//sys Setxattr(path string, attr string, data []byte, flags int) (err error)
|
|
//sys signalfd(fd int, sigmask *Sigset_t, maskSize uintptr, flags int) (newfd int, err error) = SYS_SIGNALFD4
|
|
//sys Statx(dirfd int, path string, flags int, mask int, stat *Statx_t) (err error)
|
|
//sys Sync()
|
|
//sys Syncfs(fd int) (err error)
|
|
//sysnb Sysinfo(info *Sysinfo_t) (err error)
|
|
//sys Tee(rfd int, wfd int, len int, flags int) (n int64, err error)
|
|
//sysnb TimerfdCreate(clockid int, flags int) (fd int, err error)
|
|
//sysnb TimerfdGettime(fd int, currValue *ItimerSpec) (err error)
|
|
//sysnb TimerfdSettime(fd int, flags int, newValue *ItimerSpec, oldValue *ItimerSpec) (err error)
|
|
//sysnb Tgkill(tgid int, tid int, sig syscall.Signal) (err error)
|
|
//sysnb Times(tms *Tms) (ticks uintptr, err error)
|
|
//sysnb Umask(mask int) (oldmask int)
|
|
//sysnb Uname(buf *Utsname) (err error)
|
|
//sys Unmount(target string, flags int) (err error) = SYS_UMOUNT2
|
|
//sys Unshare(flags int) (err error)
|
|
//sys write(fd int, p []byte) (n int, err error)
|
|
//sys exitThread(code int) (err error) = SYS_EXIT
|
|
//sys readlen(fd int, p *byte, np int) (n int, err error) = SYS_READ
|
|
//sys writelen(fd int, p *byte, np int) (n int, err error) = SYS_WRITE
|
|
//sys readv(fd int, iovs []Iovec) (n int, err error) = SYS_READV
|
|
//sys writev(fd int, iovs []Iovec) (n int, err error) = SYS_WRITEV
|
|
//sys preadv(fd int, iovs []Iovec, offs_l uintptr, offs_h uintptr) (n int, err error) = SYS_PREADV
|
|
//sys pwritev(fd int, iovs []Iovec, offs_l uintptr, offs_h uintptr) (n int, err error) = SYS_PWRITEV
|
|
//sys preadv2(fd int, iovs []Iovec, offs_l uintptr, offs_h uintptr, flags int) (n int, err error) = SYS_PREADV2
|
|
//sys pwritev2(fd int, iovs []Iovec, offs_l uintptr, offs_h uintptr, flags int) (n int, err error) = SYS_PWRITEV2
|
|
|
|
func bytes2iovec(bs [][]byte) []Iovec {
|
|
iovecs := make([]Iovec, len(bs))
|
|
for i, b := range bs {
|
|
iovecs[i].SetLen(len(b))
|
|
if len(b) > 0 {
|
|
iovecs[i].Base = &b[0]
|
|
} else {
|
|
iovecs[i].Base = (*byte)(unsafe.Pointer(&_zero))
|
|
}
|
|
}
|
|
return iovecs
|
|
}
|
|
|
|
// offs2lohi splits offs into its lower and upper unsigned long. On 64-bit
|
|
// systems, hi will always be 0. On 32-bit systems, offs will be split in half.
|
|
// preadv/pwritev chose this calling convention so they don't need to add a
|
|
// padding-register for alignment on ARM.
|
|
func offs2lohi(offs int64) (lo, hi uintptr) {
|
|
return uintptr(offs), uintptr(uint64(offs) >> SizeofLong)
|
|
}
|
|
|
|
func Readv(fd int, iovs [][]byte) (n int, err error) {
|
|
iovecs := bytes2iovec(iovs)
|
|
n, err = readv(fd, iovecs)
|
|
readvRacedetect(iovecs, n, err)
|
|
return n, err
|
|
}
|
|
|
|
func Preadv(fd int, iovs [][]byte, offset int64) (n int, err error) {
|
|
iovecs := bytes2iovec(iovs)
|
|
lo, hi := offs2lohi(offset)
|
|
n, err = preadv(fd, iovecs, lo, hi)
|
|
readvRacedetect(iovecs, n, err)
|
|
return n, err
|
|
}
|
|
|
|
func Preadv2(fd int, iovs [][]byte, offset int64, flags int) (n int, err error) {
|
|
iovecs := bytes2iovec(iovs)
|
|
lo, hi := offs2lohi(offset)
|
|
n, err = preadv2(fd, iovecs, lo, hi, flags)
|
|
readvRacedetect(iovecs, n, err)
|
|
return n, err
|
|
}
|
|
|
|
func readvRacedetect(iovecs []Iovec, n int, err error) {
|
|
if !raceenabled {
|
|
return
|
|
}
|
|
for i := 0; n > 0 && i < len(iovecs); i++ {
|
|
m := int(iovecs[i].Len)
|
|
if m > n {
|
|
m = n
|
|
}
|
|
n -= m
|
|
if m > 0 {
|
|
raceWriteRange(unsafe.Pointer(iovecs[i].Base), m)
|
|
}
|
|
}
|
|
if err == nil {
|
|
raceAcquire(unsafe.Pointer(&ioSync))
|
|
}
|
|
}
|
|
|
|
func Writev(fd int, iovs [][]byte) (n int, err error) {
|
|
iovecs := bytes2iovec(iovs)
|
|
if raceenabled {
|
|
raceReleaseMerge(unsafe.Pointer(&ioSync))
|
|
}
|
|
n, err = writev(fd, iovecs)
|
|
writevRacedetect(iovecs, n)
|
|
return n, err
|
|
}
|
|
|
|
func Pwritev(fd int, iovs [][]byte, offset int64) (n int, err error) {
|
|
iovecs := bytes2iovec(iovs)
|
|
if raceenabled {
|
|
raceReleaseMerge(unsafe.Pointer(&ioSync))
|
|
}
|
|
lo, hi := offs2lohi(offset)
|
|
n, err = pwritev(fd, iovecs, lo, hi)
|
|
writevRacedetect(iovecs, n)
|
|
return n, err
|
|
}
|
|
|
|
func Pwritev2(fd int, iovs [][]byte, offset int64, flags int) (n int, err error) {
|
|
iovecs := bytes2iovec(iovs)
|
|
if raceenabled {
|
|
raceReleaseMerge(unsafe.Pointer(&ioSync))
|
|
}
|
|
lo, hi := offs2lohi(offset)
|
|
n, err = pwritev2(fd, iovecs, lo, hi, flags)
|
|
writevRacedetect(iovecs, n)
|
|
return n, err
|
|
}
|
|
|
|
func writevRacedetect(iovecs []Iovec, n int) {
|
|
if !raceenabled {
|
|
return
|
|
}
|
|
for i := 0; n > 0 && i < len(iovecs); i++ {
|
|
m := int(iovecs[i].Len)
|
|
if m > n {
|
|
m = n
|
|
}
|
|
n -= m
|
|
if m > 0 {
|
|
raceReadRange(unsafe.Pointer(iovecs[i].Base), m)
|
|
}
|
|
}
|
|
}
|
|
|
|
// mmap varies by architecture; see syscall_linux_*.go.
|
|
//sys munmap(addr uintptr, length uintptr) (err error)
|
|
|
|
var mapper = &mmapper{
|
|
active: make(map[*byte][]byte),
|
|
mmap: mmap,
|
|
munmap: munmap,
|
|
}
|
|
|
|
func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
|
|
return mapper.Mmap(fd, offset, length, prot, flags)
|
|
}
|
|
|
|
func Munmap(b []byte) (err error) {
|
|
return mapper.Munmap(b)
|
|
}
|
|
|
|
//sys Madvise(b []byte, advice int) (err error)
|
|
//sys Mprotect(b []byte, prot int) (err error)
|
|
//sys Mlock(b []byte) (err error)
|
|
//sys Mlockall(flags int) (err error)
|
|
//sys Msync(b []byte, flags int) (err error)
|
|
//sys Munlock(b []byte) (err error)
|
|
//sys Munlockall() (err error)
|
|
|
|
// Vmsplice splices user pages from a slice of Iovecs into a pipe specified by fd,
|
|
// using the specified flags.
|
|
func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) {
|
|
var p unsafe.Pointer
|
|
if len(iovs) > 0 {
|
|
p = unsafe.Pointer(&iovs[0])
|
|
}
|
|
|
|
n, _, errno := Syscall6(SYS_VMSPLICE, uintptr(fd), uintptr(p), uintptr(len(iovs)), uintptr(flags), 0, 0)
|
|
if errno != 0 {
|
|
return 0, syscall.Errno(errno)
|
|
}
|
|
|
|
return int(n), nil
|
|
}
|
|
|
|
func isGroupMember(gid int) bool {
|
|
groups, err := Getgroups()
|
|
if err != nil {
|
|
return false
|
|
}
|
|
|
|
for _, g := range groups {
|
|
if g == gid {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
//sys faccessat(dirfd int, path string, mode uint32) (err error)
|
|
//sys Faccessat2(dirfd int, path string, mode uint32, flags int) (err error)
|
|
|
|
func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
|
|
if flags == 0 {
|
|
return faccessat(dirfd, path, mode)
|
|
}
|
|
|
|
if err := Faccessat2(dirfd, path, mode, flags); err != ENOSYS && err != EPERM {
|
|
return err
|
|
}
|
|
|
|
// The Linux kernel faccessat system call does not take any flags.
|
|
// The glibc faccessat implements the flags itself; see
|
|
// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/faccessat.c;hb=HEAD
|
|
// Because people naturally expect syscall.Faccessat to act
|
|
// like C faccessat, we do the same.
|
|
|
|
if flags & ^(AT_SYMLINK_NOFOLLOW|AT_EACCESS) != 0 {
|
|
return EINVAL
|
|
}
|
|
|
|
var st Stat_t
|
|
if err := Fstatat(dirfd, path, &st, flags&AT_SYMLINK_NOFOLLOW); err != nil {
|
|
return err
|
|
}
|
|
|
|
mode &= 7
|
|
if mode == 0 {
|
|
return nil
|
|
}
|
|
|
|
var uid int
|
|
if flags&AT_EACCESS != 0 {
|
|
uid = Geteuid()
|
|
} else {
|
|
uid = Getuid()
|
|
}
|
|
|
|
if uid == 0 {
|
|
if mode&1 == 0 {
|
|
// Root can read and write any file.
|
|
return nil
|
|
}
|
|
if st.Mode&0111 != 0 {
|
|
// Root can execute any file that anybody can execute.
|
|
return nil
|
|
}
|
|
return EACCES
|
|
}
|
|
|
|
var fmode uint32
|
|
if uint32(uid) == st.Uid {
|
|
fmode = (st.Mode >> 6) & 7
|
|
} else {
|
|
var gid int
|
|
if flags&AT_EACCESS != 0 {
|
|
gid = Getegid()
|
|
} else {
|
|
gid = Getgid()
|
|
}
|
|
|
|
if uint32(gid) == st.Gid || isGroupMember(gid) {
|
|
fmode = (st.Mode >> 3) & 7
|
|
} else {
|
|
fmode = st.Mode & 7
|
|
}
|
|
}
|
|
|
|
if fmode&mode == mode {
|
|
return nil
|
|
}
|
|
|
|
return EACCES
|
|
}
|
|
|
|
//sys nameToHandleAt(dirFD int, pathname string, fh *fileHandle, mountID *_C_int, flags int) (err error) = SYS_NAME_TO_HANDLE_AT
|
|
//sys openByHandleAt(mountFD int, fh *fileHandle, flags int) (fd int, err error) = SYS_OPEN_BY_HANDLE_AT
|
|
|
|
// fileHandle is the argument to nameToHandleAt and openByHandleAt. We
|
|
// originally tried to generate it via unix/linux/types.go with "type
|
|
// fileHandle C.struct_file_handle" but that generated empty structs
|
|
// for mips64 and mips64le. Instead, hard code it for now (it's the
|
|
// same everywhere else) until the mips64 generator issue is fixed.
|
|
type fileHandle struct {
|
|
Bytes uint32
|
|
Type int32
|
|
}
|
|
|
|
// FileHandle represents the C struct file_handle used by
|
|
// name_to_handle_at (see NameToHandleAt) and open_by_handle_at (see
|
|
// OpenByHandleAt).
|
|
type FileHandle struct {
|
|
*fileHandle
|
|
}
|
|
|
|
// NewFileHandle constructs a FileHandle.
|
|
func NewFileHandle(handleType int32, handle []byte) FileHandle {
|
|
const hdrSize = unsafe.Sizeof(fileHandle{})
|
|
buf := make([]byte, hdrSize+uintptr(len(handle)))
|
|
copy(buf[hdrSize:], handle)
|
|
fh := (*fileHandle)(unsafe.Pointer(&buf[0]))
|
|
fh.Type = handleType
|
|
fh.Bytes = uint32(len(handle))
|
|
return FileHandle{fh}
|
|
}
|
|
|
|
func (fh *FileHandle) Size() int { return int(fh.fileHandle.Bytes) }
|
|
func (fh *FileHandle) Type() int32 { return fh.fileHandle.Type }
|
|
func (fh *FileHandle) Bytes() []byte {
|
|
n := fh.Size()
|
|
if n == 0 {
|
|
return nil
|
|
}
|
|
return (*[1 << 30]byte)(unsafe.Pointer(uintptr(unsafe.Pointer(&fh.fileHandle.Type)) + 4))[:n:n]
|
|
}
|
|
|
|
// NameToHandleAt wraps the name_to_handle_at system call; it obtains
|
|
// a handle for a path name.
|
|
func NameToHandleAt(dirfd int, path string, flags int) (handle FileHandle, mountID int, err error) {
|
|
var mid _C_int
|
|
// Try first with a small buffer, assuming the handle will
|
|
// only be 32 bytes.
|
|
size := uint32(32 + unsafe.Sizeof(fileHandle{}))
|
|
didResize := false
|
|
for {
|
|
buf := make([]byte, size)
|
|
fh := (*fileHandle)(unsafe.Pointer(&buf[0]))
|
|
fh.Bytes = size - uint32(unsafe.Sizeof(fileHandle{}))
|
|
err = nameToHandleAt(dirfd, path, fh, &mid, flags)
|
|
if err == EOVERFLOW {
|
|
if didResize {
|
|
// We shouldn't need to resize more than once
|
|
return
|
|
}
|
|
didResize = true
|
|
size = fh.Bytes + uint32(unsafe.Sizeof(fileHandle{}))
|
|
continue
|
|
}
|
|
if err != nil {
|
|
return
|
|
}
|
|
return FileHandle{fh}, int(mid), nil
|
|
}
|
|
}
|
|
|
|
// OpenByHandleAt wraps the open_by_handle_at system call; it opens a
|
|
// file via a handle as previously returned by NameToHandleAt.
|
|
func OpenByHandleAt(mountFD int, handle FileHandle, flags int) (fd int, err error) {
|
|
return openByHandleAt(mountFD, handle.fileHandle, flags)
|
|
}
|
|
|
|
// Klogset wraps the sys_syslog system call; it sets console_loglevel to
|
|
// the value specified by arg and passes a dummy pointer to bufp.
|
|
func Klogset(typ int, arg int) (err error) {
|
|
var p unsafe.Pointer
|
|
_, _, errno := Syscall(SYS_SYSLOG, uintptr(typ), uintptr(p), uintptr(arg))
|
|
if errno != 0 {
|
|
return errnoErr(errno)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// RemoteIovec is Iovec with the pointer replaced with an integer.
|
|
// It is used for ProcessVMReadv and ProcessVMWritev, where the pointer
|
|
// refers to a location in a different process' address space, which
|
|
// would confuse the Go garbage collector.
|
|
type RemoteIovec struct {
|
|
Base uintptr
|
|
Len int
|
|
}
|
|
|
|
//sys ProcessVMReadv(pid int, localIov []Iovec, remoteIov []RemoteIovec, flags uint) (n int, err error) = SYS_PROCESS_VM_READV
|
|
//sys ProcessVMWritev(pid int, localIov []Iovec, remoteIov []RemoteIovec, flags uint) (n int, err error) = SYS_PROCESS_VM_WRITEV
|
|
|
|
/*
|
|
* Unimplemented
|
|
*/
|
|
// AfsSyscall
|
|
// Alarm
|
|
// ArchPrctl
|
|
// Brk
|
|
// ClockNanosleep
|
|
// ClockSettime
|
|
// Clone
|
|
// EpollCtlOld
|
|
// EpollPwait
|
|
// EpollWaitOld
|
|
// Execve
|
|
// Fork
|
|
// Futex
|
|
// GetKernelSyms
|
|
// GetMempolicy
|
|
// GetRobustList
|
|
// GetThreadArea
|
|
// Getitimer
|
|
// Getpmsg
|
|
// IoCancel
|
|
// IoDestroy
|
|
// IoGetevents
|
|
// IoSetup
|
|
// IoSubmit
|
|
// IoprioGet
|
|
// IoprioSet
|
|
// KexecLoad
|
|
// LookupDcookie
|
|
// Mbind
|
|
// MigratePages
|
|
// Mincore
|
|
// ModifyLdt
|
|
// Mount
|
|
// MovePages
|
|
// MqGetsetattr
|
|
// MqNotify
|
|
// MqOpen
|
|
// MqTimedreceive
|
|
// MqTimedsend
|
|
// MqUnlink
|
|
// Mremap
|
|
// Msgctl
|
|
// Msgget
|
|
// Msgrcv
|
|
// Msgsnd
|
|
// Nfsservctl
|
|
// Personality
|
|
// Pselect6
|
|
// Ptrace
|
|
// Putpmsg
|
|
// Quotactl
|
|
// Readahead
|
|
// Readv
|
|
// RemapFilePages
|
|
// RestartSyscall
|
|
// RtSigaction
|
|
// RtSigpending
|
|
// RtSigprocmask
|
|
// RtSigqueueinfo
|
|
// RtSigreturn
|
|
// RtSigsuspend
|
|
// RtSigtimedwait
|
|
// SchedGetPriorityMax
|
|
// SchedGetPriorityMin
|
|
// SchedGetparam
|
|
// SchedGetscheduler
|
|
// SchedRrGetInterval
|
|
// SchedSetparam
|
|
// SchedYield
|
|
// Security
|
|
// Semctl
|
|
// Semget
|
|
// Semop
|
|
// Semtimedop
|
|
// SetMempolicy
|
|
// SetRobustList
|
|
// SetThreadArea
|
|
// SetTidAddress
|
|
// Shmat
|
|
// Shmctl
|
|
// Shmdt
|
|
// Shmget
|
|
// Sigaltstack
|
|
// Swapoff
|
|
// Swapon
|
|
// Sysfs
|
|
// TimerCreate
|
|
// TimerDelete
|
|
// TimerGetoverrun
|
|
// TimerGettime
|
|
// TimerSettime
|
|
// Tkill (obsolete)
|
|
// Tuxcall
|
|
// Umount2
|
|
// Uselib
|
|
// Utimensat
|
|
// Vfork
|
|
// Vhangup
|
|
// Vserver
|
|
// Waitid
|
|
// _Sysctl
|