206 lines
6.9 KiB
Go
206 lines
6.9 KiB
Go
// Copyright 2020 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 devpts
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import (
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/context"
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"gvisor.dev/gvisor/pkg/sentry/arch"
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fslock "gvisor.dev/gvisor/pkg/sentry/fs/lock"
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"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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"gvisor.dev/gvisor/pkg/syserror"
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"gvisor.dev/gvisor/pkg/usermem"
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"gvisor.dev/gvisor/pkg/waiter"
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"gvisor.dev/gvisor/tools/go_marshal/primitive"
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)
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// slaveInode is the inode for the slave end of the Terminal.
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type slaveInode struct {
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implStatFS
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kernfs.InodeAttrs
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kernfs.InodeNoopRefCount
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kernfs.InodeNotDirectory
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kernfs.InodeNotSymlink
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locks vfs.FileLocks
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// Keep a reference to this inode's dentry.
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dentry kernfs.Dentry
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// root is the devpts root inode.
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root *rootInode
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// t is the connected Terminal.
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t *Terminal
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}
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var _ kernfs.Inode = (*slaveInode)(nil)
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// Open implements kernfs.Inode.Open.
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func (si *slaveInode) Open(ctx context.Context, rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
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si.IncRef()
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fd := &slaveFileDescription{
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inode: si,
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}
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fd.LockFD.Init(&si.locks)
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if err := fd.vfsfd.Init(fd, opts.Flags, rp.Mount(), vfsd, &vfs.FileDescriptionOptions{}); err != nil {
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si.DecRef(ctx)
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return nil, err
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}
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return &fd.vfsfd, nil
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}
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// Valid implements kernfs.Inode.Valid.
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func (si *slaveInode) Valid(context.Context) bool {
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// Return valid if the slave still exists.
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si.root.mu.Lock()
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defer si.root.mu.Unlock()
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_, ok := si.root.slaves[si.t.n]
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return ok
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}
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// Stat implements kernfs.Inode.Stat.
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func (si *slaveInode) Stat(ctx context.Context, vfsfs *vfs.Filesystem, opts vfs.StatOptions) (linux.Statx, error) {
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statx, err := si.InodeAttrs.Stat(ctx, vfsfs, opts)
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if err != nil {
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return linux.Statx{}, err
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}
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statx.Blksize = 1024
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statx.RdevMajor = linux.UNIX98_PTY_SLAVE_MAJOR
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statx.RdevMinor = si.t.n
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return statx, nil
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}
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// SetStat implements kernfs.Inode.SetStat
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func (si *slaveInode) SetStat(ctx context.Context, vfsfs *vfs.Filesystem, creds *auth.Credentials, opts vfs.SetStatOptions) error {
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if opts.Stat.Mask&linux.STATX_SIZE != 0 {
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return syserror.EINVAL
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}
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return si.InodeAttrs.SetStat(ctx, vfsfs, creds, opts)
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}
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type slaveFileDescription struct {
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vfsfd vfs.FileDescription
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vfs.FileDescriptionDefaultImpl
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vfs.LockFD
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inode *slaveInode
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}
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var _ vfs.FileDescriptionImpl = (*slaveFileDescription)(nil)
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// Release implements fs.FileOperations.Release.
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func (sfd *slaveFileDescription) Release(ctx context.Context) {
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sfd.inode.DecRef(ctx)
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}
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// EventRegister implements waiter.Waitable.EventRegister.
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func (sfd *slaveFileDescription) EventRegister(e *waiter.Entry, mask waiter.EventMask) {
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sfd.inode.t.ld.slaveWaiter.EventRegister(e, mask)
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}
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// EventUnregister implements waiter.Waitable.EventUnregister.
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func (sfd *slaveFileDescription) EventUnregister(e *waiter.Entry) {
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sfd.inode.t.ld.slaveWaiter.EventUnregister(e)
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}
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// Readiness implements waiter.Waitable.Readiness.
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func (sfd *slaveFileDescription) Readiness(mask waiter.EventMask) waiter.EventMask {
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return sfd.inode.t.ld.slaveReadiness()
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}
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// Read implements vfs.FileDescriptionImpl.Read.
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func (sfd *slaveFileDescription) Read(ctx context.Context, dst usermem.IOSequence, _ vfs.ReadOptions) (int64, error) {
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return sfd.inode.t.ld.inputQueueRead(ctx, dst)
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}
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// Write implements vfs.FileDescriptionImpl.Write.
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func (sfd *slaveFileDescription) Write(ctx context.Context, src usermem.IOSequence, _ vfs.WriteOptions) (int64, error) {
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return sfd.inode.t.ld.outputQueueWrite(ctx, src)
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}
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// Ioctl implements vfs.FileDescriptionImpl.Ioctl.
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func (sfd *slaveFileDescription) Ioctl(ctx context.Context, io usermem.IO, args arch.SyscallArguments) (uintptr, error) {
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t := kernel.TaskFromContext(ctx)
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if t == nil {
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// ioctl(2) may only be called from a task goroutine.
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return 0, syserror.ENOTTY
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}
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switch cmd := args[1].Uint(); cmd {
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case linux.FIONREAD: // linux.FIONREAD == linux.TIOCINQ
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// Get the number of bytes in the input queue read buffer.
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return 0, sfd.inode.t.ld.inputQueueReadSize(t, io, args)
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case linux.TCGETS:
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return sfd.inode.t.ld.getTermios(t, args)
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case linux.TCSETS:
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return sfd.inode.t.ld.setTermios(t, args)
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case linux.TCSETSW:
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// TODO(b/29356795): This should drain the output queue first.
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return sfd.inode.t.ld.setTermios(t, args)
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case linux.TIOCGPTN:
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nP := primitive.Uint32(sfd.inode.t.n)
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_, err := nP.CopyOut(t, args[2].Pointer())
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return 0, err
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case linux.TIOCGWINSZ:
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return 0, sfd.inode.t.ld.windowSize(t, args)
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case linux.TIOCSWINSZ:
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return 0, sfd.inode.t.ld.setWindowSize(t, args)
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case linux.TIOCSCTTY:
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// Make the given terminal the controlling terminal of the
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// calling process.
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return 0, sfd.inode.t.setControllingTTY(ctx, args, false /* isMaster */)
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case linux.TIOCNOTTY:
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// Release this process's controlling terminal.
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return 0, sfd.inode.t.releaseControllingTTY(ctx, args, false /* isMaster */)
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case linux.TIOCGPGRP:
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// Get the foreground process group.
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return sfd.inode.t.foregroundProcessGroup(ctx, args, false /* isMaster */)
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case linux.TIOCSPGRP:
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// Set the foreground process group.
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return sfd.inode.t.setForegroundProcessGroup(ctx, args, false /* isMaster */)
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default:
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maybeEmitUnimplementedEvent(ctx, cmd)
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return 0, syserror.ENOTTY
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}
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}
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// SetStat implements vfs.FileDescriptionImpl.SetStat.
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func (sfd *slaveFileDescription) SetStat(ctx context.Context, opts vfs.SetStatOptions) error {
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creds := auth.CredentialsFromContext(ctx)
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fs := sfd.vfsfd.VirtualDentry().Mount().Filesystem()
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return sfd.inode.SetStat(ctx, fs, creds, opts)
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}
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// Stat implements vfs.FileDescriptionImpl.Stat.
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func (sfd *slaveFileDescription) Stat(ctx context.Context, opts vfs.StatOptions) (linux.Statx, error) {
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fs := sfd.vfsfd.VirtualDentry().Mount().Filesystem()
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return sfd.inode.Stat(ctx, fs, opts)
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}
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// LockPOSIX implements vfs.FileDescriptionImpl.LockPOSIX.
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func (sfd *slaveFileDescription) LockPOSIX(ctx context.Context, uid fslock.UniqueID, t fslock.LockType, start, length uint64, whence int16, block fslock.Blocker) error {
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return sfd.Locks().LockPOSIX(ctx, &sfd.vfsfd, uid, t, start, length, whence, block)
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}
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// UnlockPOSIX implements vfs.FileDescriptionImpl.UnlockPOSIX.
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func (sfd *slaveFileDescription) UnlockPOSIX(ctx context.Context, uid fslock.UniqueID, start, length uint64, whence int16) error {
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return sfd.Locks().UnlockPOSIX(ctx, &sfd.vfsfd, uid, start, length, whence)
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}
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