// 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 ( "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 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. // IoctlSetInt performs an ioctl operation which sets an integer value // on fd, using the specified request number. func IoctlSetInt(fd int, req uint, value int) error { return ioctl(fd, req, uintptr(value)) } func IoctlSetWinsize(fd int, req uint, value *Winsize) error { return ioctl(fd, req, uintptr(unsafe.Pointer(value))) } func IoctlSetTermios(fd int, req uint, value *Termios) error { return ioctl(fd, req, uintptr(unsafe.Pointer(value))) } // IoctlGetInt performs an ioctl operation which gets an integer value // from fd, using the specified request number. func IoctlGetInt(fd int, req uint) (int, error) { var value int err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) return value, err } func IoctlGetWinsize(fd int, req uint) (*Winsize, error) { var value Winsize err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) return &value, err } func IoctlGetTermios(fd int, req uint) (*Termios, error) { var value Termios err := ioctl(fd, req, 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) //sys utimes(path string, times *[2]Timeval) (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) } //sys futimesat(dirfd int, path *byte, times *[2]Timeval) (err error) func Futimesat(dirfd int, path string, tv []Timeval) error { pathp, err := BytePtrFromString(path) if err != nil { return err } if tv == nil { return futimesat(dirfd, pathp, nil) } if len(tv) != 2 { return EINVAL } return futimesat(dirfd, pathp, (*[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 } 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 } 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 } 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 } // 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 } func anyToSockaddr(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 := (*[10000]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 } 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(&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(&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(&rsa) } func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) { vallen := _Socklen(4) err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen) return value, err } func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) { var value IPMreq vallen := _Socklen(SizeofIPMreq) err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) return &value, err } 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 GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) { var value IPv6Mreq vallen := _Socklen(SizeofIPv6Mreq) err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) return &value, err } func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) { var value IPv6MTUInfo vallen := _Socklen(SizeofIPv6MTUInfo) err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) return &value, err } func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) { var value ICMPv6Filter vallen := _Socklen(SizeofICMPv6Filter) 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 } func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) { return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq)) } // 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) } 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 = (*byte)(unsafe.Pointer(&p[0])) iov.SetLen(len(p)) } var dummy byte if len(oob) > 0 { // receive at least one normal byte if len(p) == 0 { iov.Base = &dummy iov.SetLen(1) } msg.Control = (*byte)(unsafe.Pointer(&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(&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)(unsafe.Pointer(ptr)) msg.Namelen = uint32(salen) var iov Iovec if len(p) > 0 { iov.Base = (*byte)(unsafe.Pointer(&p[0])) iov.SetLen(len(p)) } var dummy byte if len(oob) > 0 { // send at least one normal byte if len(p) == 0 { iov.Base = &dummy iov.SetLen(1) } msg.Control = (*byte)(unsafe.Pointer(&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 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 PtraceAttach(pid int) (err error) { return ptrace(PTRACE_ATTACH, 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 ReadDirent(fd int, buf []byte) (n int, err error) { return Getdents(fd, buf) } 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) } // 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 Chdir(path string) (err error) //sys Chroot(path string) (err error) //sys ClockGettime(clockid int32, time *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 Dup(oldfd int) (fd int, err error) //sys Dup3(oldfd int, newfd int, flags int) (err error) //sysnb EpollCreate(size int) (fd 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 Faccessat(dirfd int, path string, mode uint32, flags int) (err error) //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 Flock(fd int, how 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 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 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 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 read(fd int, p []byte) (n int, err error) //sys Removexattr(path string, attr string) (err error) //sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (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 } //sys Setpriority(which int, who int, prio int) (err error) //sys Setxattr(path string, attr string, data []byte, flags int) (err error) //sys Sync() //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 Ustat(dev int, ubuf *Ustat_t) (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 Munlock(b []byte) (err error) //sys Mlockall(flags int) (err error) //sys Msync(b []byte, flags int) (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) { n, _, errno := Syscall6( SYS_VMSPLICE, uintptr(fd), uintptr(unsafe.Pointer(&iovs[0])), uintptr(len(iovs)), uintptr(flags), 0, 0, ) if errno != 0 { return 0, syscall.Errno(errno) } return int(n), nil } /* * Unimplemented */ // AfsSyscall // Alarm // ArchPrctl // Brk // Capget // Capset // ClockGetres // ClockNanosleep // ClockSettime // Clone // CreateModule // DeleteModule // EpollCtlOld // EpollPwait // EpollWaitOld // Execve // Fgetxattr // Flistxattr // Fork // Fremovexattr // Fsetxattr // Futex // GetKernelSyms // GetMempolicy // GetRobustList // GetThreadArea // Getitimer // Getpmsg // IoCancel // IoDestroy // IoGetevents // IoSetup // IoSubmit // IoprioGet // IoprioSet // KexecLoad // LookupDcookie // Mbind // MigratePages // Mincore // ModifyLdt // Mount // MovePages // Mprotect // MqGetsetattr // MqNotify // MqOpen // MqTimedreceive // MqTimedsend // MqUnlink // Mremap // Msgctl // Msgget // Msgrcv // Msgsnd // Newfstatat // Nfsservctl // Personality // Pselect6 // Ptrace // Putpmsg // QueryModule // Quotactl // Readahead // Readv // RemapFilePages // RestartSyscall // RtSigaction // RtSigpending // RtSigprocmask // RtSigqueueinfo // RtSigreturn // RtSigsuspend // RtSigtimedwait // SchedGetPriorityMax // SchedGetPriorityMin // SchedGetaffinity // SchedGetparam // SchedGetscheduler // SchedRrGetInterval // SchedSetaffinity // SchedSetparam // SchedYield // Security // Semctl // Semget // Semop // Semtimedop // SetMempolicy // SetRobustList // SetThreadArea // SetTidAddress // Shmat // Shmctl // Shmdt // Shmget // Sigaltstack // Signalfd // Swapoff // Swapon // Sysfs // TimerCreate // TimerDelete // TimerGetoverrun // TimerGettime // TimerSettime // Timerfd // Tkill (obsolete) // Tuxcall // Umount2 // Uselib // Utimensat // Vfork // Vhangup // Vserver // Waitid // _Sysctl