| // Copyright 2009 The Go Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| // Linux system calls. | |
| // This file is compiled as ordinary Go code, | |
| // but it is also input to mksyscall, | |
| // which parses the //sys lines and generates system call stubs. | |
| // Note that sometimes we use a lowercase //sys name and | |
| // wrap it in our own nicer implementation. | |
| package unix | |
| import ( | |
| "encoding/binary" | |
| "runtime" | |
| "syscall" | |
| "unsafe" | |
| ) | |
| /* | |
| * Wrapped | |
| */ | |
| func Access(path string, mode uint32) (err error) { | |
| return Faccessat(AT_FDCWD, path, mode, 0) | |
| } | |
| func Chmod(path string, mode uint32) (err error) { | |
| return Fchmodat(AT_FDCWD, path, mode, 0) | |
| } | |
| func Chown(path string, uid int, gid int) (err error) { | |
| return Fchownat(AT_FDCWD, path, uid, gid, 0) | |
| } | |
| func Creat(path string, mode uint32) (fd int, err error) { | |
| return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode) | |
| } | |
| //sys FanotifyInit(flags uint, event_f_flags uint) (fd int, err error) | |
| //sys fanotifyMark(fd int, flags uint, mask uint64, dirFd int, pathname *byte) (err error) | |
| func FanotifyMark(fd int, flags uint, mask uint64, dirFd int, pathname string) (err error) { | |
| if pathname == "" { | |
| return fanotifyMark(fd, flags, mask, dirFd, nil) | |
| } | |
| p, err := BytePtrFromString(pathname) | |
| if err != nil { | |
| return err | |
| } | |
| return fanotifyMark(fd, flags, mask, dirFd, p) | |
| } | |
| //sys fchmodat(dirfd int, path string, mode uint32) (err error) | |
| func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) { | |
| // Linux fchmodat doesn't support the flags parameter. Mimick glibc's behavior | |
| // and check the flags. Otherwise the mode would be applied to the symlink | |
| // destination which is not what the user expects. | |
| if flags&^AT_SYMLINK_NOFOLLOW != 0 { | |
| return EINVAL | |
| } else if flags&AT_SYMLINK_NOFOLLOW != 0 { | |
| return EOPNOTSUPP | |
| } | |
| return fchmodat(dirfd, path, mode) | |
| } | |
| //sys ioctl(fd int, req uint, arg uintptr) (err error) | |
| // ioctl itself should not be exposed directly, but additional get/set | |
| // functions for specific types are permissible. | |
| // IoctlRetInt performs an ioctl operation specified by req on a device | |
| // associated with opened file descriptor fd, and returns a non-negative | |
| // integer that is returned by the ioctl syscall. | |
| func IoctlRetInt(fd int, req uint) (int, error) { | |
| ret, _, err := Syscall(SYS_IOCTL, uintptr(fd), uintptr(req), 0) | |
| if err != 0 { | |
| return 0, err | |
| } | |
| return int(ret), nil | |
| } | |
| // IoctlSetPointerInt performs an ioctl operation which sets an | |
| // integer value on fd, using the specified request number. The ioctl | |
| // argument is called with a pointer to the integer value, rather than | |
| // passing the integer value directly. | |
| func IoctlSetPointerInt(fd int, req uint, value int) error { | |
| v := int32(value) | |
| return ioctl(fd, req, uintptr(unsafe.Pointer(&v))) | |
| } | |
| func IoctlSetRTCTime(fd int, value *RTCTime) error { | |
| err := ioctl(fd, RTC_SET_TIME, uintptr(unsafe.Pointer(value))) | |
| runtime.KeepAlive(value) | |
| return err | |
| } | |
| func IoctlGetUint32(fd int, req uint) (uint32, error) { | |
| var value uint32 | |
| err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) | |
| return value, err | |
| } | |
| func IoctlGetRTCTime(fd int) (*RTCTime, error) { | |
| var value RTCTime | |
| err := ioctl(fd, RTC_RD_TIME, uintptr(unsafe.Pointer(&value))) | |
| return &value, err | |
| } | |
| //sys Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) | |
| func Link(oldpath string, newpath string) (err error) { | |
| return Linkat(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0) | |
| } | |
| func Mkdir(path string, mode uint32) (err error) { | |
| return Mkdirat(AT_FDCWD, path, mode) | |
| } | |
| func Mknod(path string, mode uint32, dev int) (err error) { | |
| return Mknodat(AT_FDCWD, path, mode, dev) | |
| } | |
| func Open(path string, mode int, perm uint32) (fd int, err error) { | |
| return openat(AT_FDCWD, path, mode|O_LARGEFILE, perm) | |
| } | |
| //sys openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) | |
| func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) { | |
| return openat(dirfd, path, flags|O_LARGEFILE, mode) | |
| } | |
| //sys ppoll(fds *PollFd, nfds int, timeout *Timespec, sigmask *Sigset_t) (n int, err error) | |
| func Ppoll(fds []PollFd, timeout *Timespec, sigmask *Sigset_t) (n int, err error) { | |
| if len(fds) == 0 { | |
| return ppoll(nil, 0, timeout, sigmask) | |
| } | |
| return ppoll(&fds[0], len(fds), timeout, sigmask) | |
| } | |
| //sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error) | |
| func Readlink(path string, buf []byte) (n int, err error) { | |
| return Readlinkat(AT_FDCWD, path, buf) | |
| } | |
| func Rename(oldpath string, newpath string) (err error) { | |
| return Renameat(AT_FDCWD, oldpath, AT_FDCWD, newpath) | |
| } | |
| func Rmdir(path string) error { | |
| return Unlinkat(AT_FDCWD, path, AT_REMOVEDIR) | |
| } | |
| //sys Symlinkat(oldpath string, newdirfd int, newpath string) (err error) | |
| func Symlink(oldpath string, newpath string) (err error) { | |
| return Symlinkat(oldpath, AT_FDCWD, newpath) | |
| } | |
| func Unlink(path string) error { | |
| return Unlinkat(AT_FDCWD, path, 0) | |
| } | |
| //sys Unlinkat(dirfd int, path string, flags int) (err error) | |
| func Utimes(path string, tv []Timeval) error { | |
| if tv == nil { | |
| err := utimensat(AT_FDCWD, path, nil, 0) | |
| if err != ENOSYS { | |
| return err | |
| } | |
| return utimes(path, nil) | |
| } | |
| if len(tv) != 2 { | |
| return EINVAL | |
| } | |
| var ts [2]Timespec | |
| ts[0] = NsecToTimespec(TimevalToNsec(tv[0])) | |
| ts[1] = NsecToTimespec(TimevalToNsec(tv[1])) | |
| err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0) | |
| if err != ENOSYS { | |
| return err | |
| } | |
| return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) | |
| } | |
| //sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) | |
| func UtimesNano(path string, ts []Timespec) error { | |
| if ts == nil { | |
| err := utimensat(AT_FDCWD, path, nil, 0) | |
| if err != ENOSYS { | |
| return err | |
| } | |
| return utimes(path, nil) | |
| } | |
| if len(ts) != 2 { | |
| return EINVAL | |
| } | |
| err := utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0) | |
| if err != ENOSYS { | |
| return err | |
| } | |
| // If the utimensat syscall isn't available (utimensat was added to Linux | |
| // in 2.6.22, Released, 8 July 2007) then fall back to utimes | |
| var tv [2]Timeval | |
| for i := 0; i < 2; i++ { | |
| tv[i] = NsecToTimeval(TimespecToNsec(ts[i])) | |
| } | |
| return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) | |
| } | |
| func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error { | |
| if ts == nil { | |
| return utimensat(dirfd, path, nil, flags) | |
| } | |
| if len(ts) != 2 { | |
| return EINVAL | |
| } | |
| return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags) | |
| } | |
| func Futimesat(dirfd int, path string, tv []Timeval) error { | |
| if tv == nil { | |
| return futimesat(dirfd, path, nil) | |
| } | |
| if len(tv) != 2 { | |
| return EINVAL | |
| } | |
| return futimesat(dirfd, path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) | |
| } | |
| func Futimes(fd int, tv []Timeval) (err error) { | |
| // Believe it or not, this is the best we can do on Linux | |
| // (and is what glibc does). | |
| return Utimes("/proc/self/fd/"+itoa(fd), tv) | |
| } | |
| const ImplementsGetwd = true | |
| //sys Getcwd(buf []byte) (n int, err error) | |
| func Getwd() (wd string, err error) { | |
| var buf [PathMax]byte | |
| n, err := Getcwd(buf[0:]) | |
| if err != nil { | |
| return "", err | |
| } | |
| // Getcwd returns the number of bytes written to buf, including the NUL. | |
| if n < 1 || n > len(buf) || buf[n-1] != 0 { | |
| return "", EINVAL | |
| } | |
| return string(buf[0 : n-1]), nil | |
| } | |
| func Getgroups() (gids []int, err error) { | |
| n, err := getgroups(0, nil) | |
| if err != nil { | |
| return nil, err | |
| } | |
| if n == 0 { | |
| return nil, nil | |
| } | |
| // Sanity check group count. Max is 1<<16 on Linux. | |
| if n < 0 || n > 1<<20 { | |
| return nil, EINVAL | |
| } | |
| a := make([]_Gid_t, n) | |
| n, err = getgroups(n, &a[0]) | |
| if err != nil { | |
| return nil, err | |
| } | |
| gids = make([]int, n) | |
| for i, v := range a[0:n] { | |
| gids[i] = int(v) | |
| } | |
| return | |
| } | |
| func Setgroups(gids []int) (err error) { | |
| if len(gids) == 0 { | |
| return setgroups(0, nil) | |
| } | |
| a := make([]_Gid_t, len(gids)) | |
| for i, v := range gids { | |
| a[i] = _Gid_t(v) | |
| } | |
| return setgroups(len(a), &a[0]) | |
| } | |
| type WaitStatus uint32 | |
| // Wait status is 7 bits at bottom, either 0 (exited), | |
| // 0x7F (stopped), or a signal number that caused an exit. | |
| // The 0x80 bit is whether there was a core dump. | |
| // An extra number (exit code, signal causing a stop) | |
| // is in the high bits. At least that's the idea. | |
| // There are various irregularities. For example, the | |
| // "continued" status is 0xFFFF, distinguishing itself | |
| // from stopped via the core dump bit. | |
| const ( | |
| mask = 0x7F | |
| core = 0x80 | |
| exited = 0x00 | |
| stopped = 0x7F | |
| shift = 8 | |
| ) | |
| func (w WaitStatus) Exited() bool { return w&mask == exited } | |
| func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != exited } | |
| func (w WaitStatus) Stopped() bool { return w&0xFF == stopped } | |
| func (w WaitStatus) Continued() bool { return w == 0xFFFF } | |
| func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 } | |
| func (w WaitStatus) ExitStatus() int { | |
| if !w.Exited() { | |
| return -1 | |
| } | |
| return int(w>>shift) & 0xFF | |
| } | |
| func (w WaitStatus) Signal() syscall.Signal { | |
| if !w.Signaled() { | |
| return -1 | |
| } | |
| return syscall.Signal(w & mask) | |
| } | |
| func (w WaitStatus) StopSignal() syscall.Signal { | |
| if !w.Stopped() { | |
| return -1 | |
| } | |
| return syscall.Signal(w>>shift) & 0xFF | |
| } | |
| func (w WaitStatus) TrapCause() int { | |
| if w.StopSignal() != SIGTRAP { | |
| return -1 | |
| } | |
| return int(w>>shift) >> 8 | |
| } | |
| //sys wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error) | |
| 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 | |
| } | |
| // 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 | |
| } | |
| 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: | |
| 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: | |
| 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 := GetsockoptInt(fd, SOL_SOCKET, SO_PROTOCOL) | |
| 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 | |
| } | |
| 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) | |
| //sys Capget(hdr *CapUserHeader, data *CapUserData) (err error) | |
| //sys 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 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) | |
| //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 fcntl(fd int, cmd int, arg int) (val 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) | |
| // 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 | |
| } | |
| 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 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 | |
| // 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 | |
| } | |
| //sys faccessat(dirfd int, path string, mode uint32) (err error) | |
| func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) { | |
| if flags & ^(AT_SYMLINK_NOFOLLOW|AT_EACCESS) != 0 { | |
| return EINVAL | |
| } | |
| // 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 == 0 { | |
| return faccessat(dirfd, path, mode) | |
| } | |
| 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 { | |
| 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 | |
| } | |
| /* | |
| * 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 | |
| // Timerfd | |
| // Tkill (obsolete) | |
| // Tuxcall | |
| // Umount2 | |
| // Uselib | |
| // Utimensat | |
| // Vfork | |
| // Vhangup | |
| // Vserver | |
| // Waitid | |
| // _Sysctl |