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 | 440 |
1 files changed, 329 insertions, 111 deletions
diff --git a/vendor/golang.org/x/sys/unix/syscall_linux.go b/vendor/golang.org/x/sys/unix/syscall_linux.go index 797cda7e..96ff70dc 100644 --- a/vendor/golang.org/x/sys/unix/syscall_linux.go +++ b/vendor/golang.org/x/sys/unix/syscall_linux.go @@ -12,6 +12,8 @@ package unix import ( + "encoding/binary" + "net" "syscall" "unsafe" ) @@ -61,11 +63,11 @@ func IoctlSetInt(fd int, req uint, value int) error { return ioctl(fd, req, uintptr(value)) } -func IoctlSetWinsize(fd int, req uint, value *Winsize) error { +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 { +func ioctlSetTermios(fd int, req uint, value *Termios) error { return ioctl(fd, req, uintptr(unsafe.Pointer(value))) } @@ -148,8 +150,6 @@ func Unlink(path string) error { //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) @@ -207,20 +207,14 @@ func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error { 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) + return futimesat(dirfd, path, nil) } if len(tv) != 2 { return EINVAL } - return futimesat(dirfd, pathp, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) + return futimesat(dirfd, path, (*[2]Timeval)(unsafe.Pointer(&tv[0]))) } func Futimes(fd int, tv []Timeval) (err error) { @@ -413,6 +407,7 @@ func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) { return unsafe.Pointer(&sa.raw), sl, nil } +// SockaddrLinklayer implements the Sockaddr interface for AF_PACKET type sockets. type SockaddrLinklayer struct { Protocol uint16 Ifindex int @@ -439,6 +434,7 @@ func (sa *SockaddrLinklayer) sockaddr() (unsafe.Pointer, _Socklen, error) { return unsafe.Pointer(&sa.raw), SizeofSockaddrLinklayer, nil } +// SockaddrNetlink implements the Sockaddr interface for AF_NETLINK type sockets. type SockaddrNetlink struct { Family uint16 Pad uint16 @@ -455,6 +451,8 @@ func (sa *SockaddrNetlink) sockaddr() (unsafe.Pointer, _Socklen, error) { 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 @@ -468,6 +466,72 @@ func (sa *SockaddrHCI) sockaddr() (unsafe.Pointer, _Socklen, error) { 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 @@ -630,7 +694,70 @@ func (sa *SockaddrVM) sockaddr() (unsafe.Pointer, _Socklen, error) { return unsafe.Pointer(&sa.raw), SizeofSockaddrVM, nil } -func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) { +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 net.HardwareAddr + 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 +} + +func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) { switch rsa.Addr.Family { case AF_NETLINK: pp := (*RawSockaddrNetlink)(unsafe.Pointer(rsa)) @@ -707,6 +834,55 @@ func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) { Port: pp.Port, } return sa, nil + case AF_BLUETOOTH: + proto, err := GetsockoptInt(fd, SOL_SOCKET, SO_PROTOCOL) + if err != nil { + return nil, err + } + // only BTPROTO_L2CAP and BTPROTO_RFCOMM can accept connections + switch proto { + case BTPROTO_L2CAP: + pp := (*RawSockaddrL2)(unsafe.Pointer(rsa)) + sa := &SockaddrL2{ + PSM: pp.Psm, + CID: pp.Cid, + Addr: pp.Bdaddr, + AddrType: pp.Bdaddr_type, + } + return sa, nil + case BTPROTO_RFCOMM: + pp := (*RawSockaddrRFCOMM)(unsafe.Pointer(rsa)) + sa := &SockaddrRFCOMM{ + Channel: pp.Channel, + Addr: pp.Bdaddr, + } + return sa, nil + } + case AF_XDP: + pp := (*RawSockaddrXDP)(unsafe.Pointer(rsa)) + sa := &SockaddrXDP{ + Flags: pp.Flags, + Ifindex: pp.Ifindex, + QueueID: pp.Queue_id, + SharedUmemFD: pp.Shared_umem_fd, + } + return sa, nil + case AF_PPPOX: + pp := (*RawSockaddrPPPoX)(unsafe.Pointer(rsa)) + if binary.BigEndian.Uint32(pp[2:6]) != px_proto_oe { + return nil, EINVAL + } + sa := &SockaddrPPPoE{ + SID: binary.BigEndian.Uint16(pp[6:8]), + Remote: net.HardwareAddr(pp[8:14]), + } + for i := 14; i < 14+IFNAMSIZ; i++ { + if pp[i] == 0 { + sa.Dev = string(pp[14:i]) + break + } + } + return sa, nil } return nil, EAFNOSUPPORT } @@ -718,7 +894,7 @@ func Accept(fd int) (nfd int, sa Sockaddr, err error) { if err != nil { return } - sa, err = anyToSockaddr(&rsa) + sa, err = anyToSockaddr(fd, &rsa) if err != nil { Close(nfd) nfd = 0 @@ -736,7 +912,7 @@ func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) { if len > SizeofSockaddrAny { panic("RawSockaddrAny too small") } - sa, err = anyToSockaddr(&rsa) + sa, err = anyToSockaddr(fd, &rsa) if err != nil { Close(nfd) nfd = 0 @@ -750,20 +926,7 @@ func Getsockname(fd int) (sa Sockaddr, err error) { 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 + return anyToSockaddr(fd, &rsa) } func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) { @@ -773,27 +936,6 @@ func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) { 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) @@ -808,6 +950,24 @@ func GetsockoptTCPInfo(fd, level, opt int) (*TCPInfo, error) { 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 SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) { return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq)) } @@ -931,15 +1091,17 @@ func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from } var dummy byte if len(oob) > 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 && len(p) == 0 { - iov.Base = &dummy - iov.SetLen(1) + 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)) @@ -953,7 +1115,7 @@ func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from recvflags = int(msg.Flags) // source address is only specified if the socket is unconnected if rsa.Addr.Family != AF_UNSPEC { - from, err = anyToSockaddr(&rsa) + from, err = anyToSockaddr(fd, &rsa) } return } @@ -983,15 +1145,17 @@ func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) } var dummy byte if len(oob) > 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 && len(p) == 0 { - iov.Base = &dummy - iov.SetLen(1) + 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)) @@ -1021,7 +1185,7 @@ func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err erro // The ptrace syscall differs from glibc's ptrace. // Peeks returns the word in *data, not as the return value. - var buf [sizeofPtr]byte + var buf [SizeofPtr]byte // Leading edge. PEEKTEXT/PEEKDATA don't require aligned // access (PEEKUSER warns that it might), but if we don't @@ -1029,12 +1193,12 @@ func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, err erro // 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 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:]) + n += copy(out, buf[addr%SizeofPtr:]) out = out[n:] } @@ -1072,15 +1236,15 @@ func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (c // 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 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) + n += copy(buf[addr%SizeofPtr:], data) word := *((*uintptr)(unsafe.Pointer(&buf[0]))) - err = ptrace(pokeReq, pid, addr-addr%sizeofPtr, word) + err = ptrace(pokeReq, pid, addr-addr%SizeofPtr, word) if err != nil { return 0, err } @@ -1088,19 +1252,19 @@ func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (c } // Interior. - for len(data) > sizeofPtr { + 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:] + n += SizeofPtr + data = data[SizeofPtr:] } // Trailing edge. if len(data) > 0 { - var buf [sizeofPtr]byte + var buf [SizeofPtr]byte err = ptrace(peekReq, pid, addr+uintptr(n), uintptr(unsafe.Pointer(&buf[0]))) if err != nil { return n, err @@ -1172,22 +1336,6 @@ 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) { @@ -1215,24 +1363,29 @@ func Mount(source string, target string, fstype string, flags uintptr, data stri //sys Adjtimex(buf *Timex) (state int, 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 Close(fd int) (err error) //sys CopyFileRange(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) +//sys DeleteModule(name string, flags int) (err error) //sys Dup(oldfd int) (fd int, err error) //sys Dup3(oldfd int, newfd int, flags int) (err error) -//sysnb 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 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) @@ -1250,6 +1403,7 @@ func Getpgrp() (pid int) { //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) @@ -1260,9 +1414,11 @@ func Getpgrp() (pid int) { //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) @@ -1270,6 +1426,7 @@ func Getpgrp() (pid int) { //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 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) @@ -1293,6 +1450,7 @@ func Setgid(uid int) (err error) { //sys Setpriority(which int, who int, prio int) (err error) //sys Setxattr(path string, attr string, data []byte, flags int) (err error) +//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) @@ -1303,7 +1461,6 @@ func Setgid(uid int) (err error) { //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 @@ -1353,6 +1510,77 @@ func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) { return int(n), nil } +//sys faccessat(dirfd int, path string, mode uint32) (err error) + +func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) { + if flags & ^(AT_SYMLINK_NOFOLLOW|AT_EACCESS) != 0 { + return EINVAL + } + + // The Linux kernel faccessat system call does not take any flags. + // The glibc faccessat implements the flags itself; see + // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/faccessat.c;hb=HEAD + // Because people naturally expect syscall.Faccessat to act + // like C faccessat, we do the same. + + if flags == 0 { + return faccessat(dirfd, path, mode) + } + + var st Stat_t + if err := Fstatat(dirfd, path, &st, flags&AT_SYMLINK_NOFOLLOW); err != nil { + return err + } + + mode &= 7 + if mode == 0 { + return nil + } + + var uid int + if flags&AT_EACCESS != 0 { + uid = Geteuid() + } else { + uid = Getuid() + } + + if uid == 0 { + if mode&1 == 0 { + // Root can read and write any file. + return nil + } + if st.Mode&0111 != 0 { + // Root can execute any file that anybody can execute. + return nil + } + return EACCES + } + + var fmode uint32 + if uint32(uid) == st.Uid { + fmode = (st.Mode >> 6) & 7 + } else { + var gid int + if flags&AT_EACCESS != 0 { + gid = Getegid() + } else { + gid = Getgid() + } + + if uint32(gid) == st.Gid { + fmode = (st.Mode >> 3) & 7 + } else { + fmode = st.Mode & 7 + } + } + + if fmode&mode == mode { + return nil + } + + return EACCES +} + /* * Unimplemented */ @@ -1362,21 +1590,14 @@ func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) { // Brk // Capget // Capset -// ClockGetres // ClockNanosleep // ClockSettime // Clone -// CreateModule -// DeleteModule // EpollCtlOld // EpollPwait // EpollWaitOld // Execve -// Fgetxattr -// Flistxattr // Fork -// Fremovexattr -// Fsetxattr // Futex // GetKernelSyms // GetMempolicy @@ -1415,7 +1636,6 @@ func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) { // Pselect6 // Ptrace // Putpmsg -// QueryModule // Quotactl // Readahead // Readv @@ -1430,11 +1650,9 @@ func Vmsplice(fd int, iovs []Iovec, flags int) (int, error) { // RtSigtimedwait // SchedGetPriorityMax // SchedGetPriorityMin -// SchedGetaffinity // SchedGetparam // SchedGetscheduler // SchedRrGetInterval -// SchedSetaffinity // SchedSetparam // SchedYield // Security |