2c4ae3b0a4
Содержимое пина, зафиксированного в go.mod sing-box-lx, одним коммитом без истории. Полная история SagerNet/gvisor — 1.45 ГБ и клонируется в каждой CI-джобе; наша дельта — одна вставка в одну функцию, история для неё не нужна. Module path github.com/sagernet/gvisor сохранён намеренно: на него опирается replace-директива суперпроекта. Патч поверх — отдельным коммитом, чтобы дельта читалась одним git show и переносилась на новый пин копированием. SPECS/TASKS/048-GVISOR_HANDSHAKE_NIL_CRASH
121 lines
3.3 KiB
Go
121 lines
3.3 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package fsutil
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import (
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"unsafe"
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"github.com/sagernet/gvisor/pkg/syserr"
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"golang.org/x/sys/unix"
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)
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// UnixDirentMaxSize is the maximum size of unix.Dirent in bytes.
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var UnixDirentMaxSize = int(unsafe.Sizeof(unix.Dirent{}))
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// Utimensat is a convenience wrapper to make the utimensat(2) syscall. It
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// additionally handles empty name.
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func Utimensat(dirFd int, name string, times [2]unix.Timespec, flags int) error {
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// utimensat(2) doesn't accept empty name, instead name must be nil to make it
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// operate directly on 'dirFd' unlike other *at syscalls.
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var namePtr unsafe.Pointer
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if name != "" {
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nameBytes, err := unix.BytePtrFromString(name)
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if err != nil {
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return err
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}
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namePtr = unsafe.Pointer(nameBytes)
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}
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timesPtr := unsafe.Pointer(×[0])
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if _, _, errno := unix.Syscall6(
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unix.SYS_UTIMENSAT,
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uintptr(dirFd),
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uintptr(namePtr),
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uintptr(timesPtr),
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uintptr(flags),
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0,
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0); errno != 0 {
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return syserr.FromHost(errno).ToError()
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}
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return nil
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}
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// RenameAt is a convenience wrapper to make the renameat(2) syscall. It
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// additionally handles empty names.
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func RenameAt(oldDirFD int, oldName string, newDirFD int, newName string) error {
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var oldNamePtr unsafe.Pointer
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if oldName != "" {
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nameBytes, err := unix.BytePtrFromString(oldName)
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if err != nil {
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return err
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}
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oldNamePtr = unsafe.Pointer(nameBytes)
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}
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var newNamePtr unsafe.Pointer
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if newName != "" {
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nameBytes, err := unix.BytePtrFromString(newName)
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if err != nil {
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return err
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}
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newNamePtr = unsafe.Pointer(nameBytes)
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}
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if _, _, errno := unix.Syscall6(
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unix.SYS_RENAMEAT,
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uintptr(oldDirFD),
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uintptr(oldNamePtr),
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uintptr(newDirFD),
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uintptr(newNamePtr),
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0,
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0); errno != 0 {
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return syserr.FromHost(errno).ToError()
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}
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return nil
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}
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// ParseDirents parses dirents from buf. buf must have been populated by
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// getdents64(2) syscall. It calls the handleDirent callback for each dirent.
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func ParseDirents(buf []byte, handleDirent DirentHandler) {
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for len(buf) > 0 {
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// Interpret the buf populated by unix.Getdents as unix.Dirent.
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dirent := *(*unix.Dirent)(unsafe.Pointer(&buf[0]))
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// Advance buf for the next dirent.
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buf = buf[dirent.Reclen:]
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// Extracting the name is pretty tedious...
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var nameBuf [unix.NAME_MAX]byte
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var nameLen int
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for i := 0; i < len(dirent.Name); i++ {
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// The name is null terminated.
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if dirent.Name[i] == 0 {
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nameLen = i
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break
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}
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nameBuf[i] = byte(dirent.Name[i])
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}
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name := string(nameBuf[:nameLen])
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// Skip `.` and `..` entries. It is anyways ignored by the client. We also
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// don't want to leak information about `..`.
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if name == "." || name == ".." {
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continue
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}
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// Deliver results to caller.
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handleDirent(dirent.Ino, dirent.Off, dirent.Type, name, dirent.Reclen)
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}
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}
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