diff options
Diffstat (limited to 'vendor/golang.org/x/sys/unix/syscall_linux.go')
| -rw-r--r-- | vendor/golang.org/x/sys/unix/syscall_linux.go | 2400 |
1 files changed, 2400 insertions, 0 deletions
diff --git a/vendor/golang.org/x/sys/unix/syscall_linux.go b/vendor/golang.org/x/sys/unix/syscall_linux.go new file mode 100644 index 0000000..41b91fd --- /dev/null +++ b/vendor/golang.org/x/sys/unix/syscall_linux.go @@ -0,0 +1,2400 @@ +// 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. +// These are defined in ioctl.go and ioctl_linux.go. + +//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 openat2(dirfd int, path string, open_how *OpenHow, size int) (fd int, err error) + +func Openat2(dirfd int, path string, how *OpenHow) (fd int, err error) { + return openat2(dirfd, path, how, SizeofOpenHow) +} + +//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 +} + +// 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_LOCAL: refers to local communication (loopback). + // - VMADDR_CID_HOST: refers to other processes on the host. + CID uint32 + Port uint32 + Flags uint8 + 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 + sa.raw.Flags = sa.Flags + + 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 +} + +type SockaddrNFC struct { + DeviceIdx uint32 + TargetIdx uint32 + NFCProtocol uint32 + raw RawSockaddrNFC +} + +func (sa *SockaddrNFC) sockaddr() (unsafe.Pointer, _Socklen, error) { + sa.raw.Sa_family = AF_NFC + sa.raw.Dev_idx = sa.DeviceIdx + sa.raw.Target_idx = sa.TargetIdx + sa.raw.Nfc_protocol = sa.NFCProtocol + return unsafe.Pointer(&sa.raw), SizeofSockaddrNFC, nil +} + +type SockaddrNFCLLCP struct { + DeviceIdx uint32 + TargetIdx uint32 + NFCProtocol uint32 + DestinationSAP uint8 + SourceSAP uint8 + ServiceName string + raw RawSockaddrNFCLLCP +} + +func (sa *SockaddrNFCLLCP) sockaddr() (unsafe.Pointer, _Socklen, error) { + sa.raw.Sa_family = AF_NFC + sa.raw.Dev_idx = sa.DeviceIdx + sa.raw.Target_idx = sa.TargetIdx + sa.raw.Nfc_protocol = sa.NFCProtocol + sa.raw.Dsap = sa.DestinationSAP + sa.raw.Ssap = sa.SourceSAP + if len(sa.ServiceName) > len(sa.raw.Service_name) { + return nil, 0, EINVAL + } + copy(sa.raw.Service_name[:], sa.ServiceName) + sa.raw.SetServiceNameLen(len(sa.ServiceName)) + return unsafe.Pointer(&sa.raw), SizeofSockaddrNFCLLCP, 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, + Flags: pp.Flags, + } + 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 + } + case AF_NFC: + proto, err := socketProtocol(fd) + if err != nil { + return nil, err + } + switch proto { + case NFC_SOCKPROTO_RAW: + pp := (*RawSockaddrNFC)(unsafe.Pointer(rsa)) + sa := &SockaddrNFC{ + DeviceIdx: pp.Dev_idx, + TargetIdx: pp.Target_idx, + NFCProtocol: pp.Nfc_protocol, + } + return sa, nil + case NFC_SOCKPROTO_LLCP: + pp := (*RawSockaddrNFCLLCP)(unsafe.Pointer(rsa)) + if uint64(pp.Service_name_len) > uint64(len(pp.Service_name)) { + return nil, EINVAL + } + sa := &SockaddrNFCLLCP{ + DeviceIdx: pp.Dev_idx, + TargetIdx: pp.Target_idx, + NFCProtocol: pp.Nfc_protocol, + DestinationSAP: pp.Dsap, + SourceSAP: pp.Ssap, + ServiceName: string(pp.Service_name[:pp.Service_name_len]), + } + return sa, nil + default: + return nil, EINVAL + } + } + return nil, EAFNOSUPPORT +} + +func Accept(fd int) (nfd int, sa Sockaddr, err error) { + var rsa RawSockaddrAny + var len _Socklen = SizeofSockaddrAny + // Try accept4 first for Android, then try accept for kernel older than 2.6.28 + nfd, err = accept4(fd, &rsa, &len, 0) + if err == ENOSYS { + 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 |