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// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package devpts
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/errors/linuxerr"
"gvisor.dev/gvisor/pkg/marshal/primitive"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
"gvisor.dev/gvisor/pkg/sentry/unimpl"
"gvisor.dev/gvisor/pkg/sentry/vfs"
"gvisor.dev/gvisor/pkg/syserror"
"gvisor.dev/gvisor/pkg/usermem"
"gvisor.dev/gvisor/pkg/waiter"
)
// masterInode is the inode for the master end of the Terminal.
//
// +stateify savable
type masterInode struct {
implStatFS
kernfs.InodeAttrs
kernfs.InodeNoopRefCount
kernfs.InodeNotDirectory
kernfs.InodeNotSymlink
locks vfs.FileLocks
// root is the devpts root inode.
root *rootInode
}
var _ kernfs.Inode = (*masterInode)(nil)
// Open implements kernfs.Inode.Open.
func (mi *masterInode) Open(ctx context.Context, rp *vfs.ResolvingPath, d *kernfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
t, err := mi.root.allocateTerminal(ctx, rp.Credentials())
if err != nil {
return nil, err
}
fd := &masterFileDescription{
inode: mi,
t: t,
}
fd.LockFD.Init(&mi.locks)
if err := fd.vfsfd.Init(fd, opts.Flags, rp.Mount(), d.VFSDentry(), &vfs.FileDescriptionOptions{}); err != nil {
return nil, err
}
return &fd.vfsfd, nil
}
// Stat implements kernfs.Inode.Stat.
func (mi *masterInode) Stat(ctx context.Context, vfsfs *vfs.Filesystem, opts vfs.StatOptions) (linux.Statx, error) {
statx, err := mi.InodeAttrs.Stat(ctx, vfsfs, opts)
if err != nil {
return linux.Statx{}, err
}
statx.Blksize = 1024
statx.RdevMajor = linux.TTYAUX_MAJOR
statx.RdevMinor = linux.PTMX_MINOR
return statx, nil
}
// SetStat implements kernfs.Inode.SetStat
func (mi *masterInode) SetStat(ctx context.Context, vfsfs *vfs.Filesystem, creds *auth.Credentials, opts vfs.SetStatOptions) error {
if opts.Stat.Mask&linux.STATX_SIZE != 0 {
return linuxerr.EINVAL
}
return mi.InodeAttrs.SetStat(ctx, vfsfs, creds, opts)
}
// +stateify savable
type masterFileDescription struct {
vfsfd vfs.FileDescription
vfs.FileDescriptionDefaultImpl
vfs.LockFD
inode *masterInode
t *Terminal
}
var _ vfs.FileDescriptionImpl = (*masterFileDescription)(nil)
// Release implements vfs.FileDescriptionImpl.Release.
func (mfd *masterFileDescription) Release(ctx context.Context) {
mfd.inode.root.masterClose(ctx, mfd.t)
}
// EventRegister implements waiter.Waitable.EventRegister.
func (mfd *masterFileDescription) EventRegister(e *waiter.Entry, mask waiter.EventMask) {
mfd.t.ld.masterWaiter.EventRegister(e, mask)
}
// EventUnregister implements waiter.Waitable.EventUnregister.
func (mfd *masterFileDescription) EventUnregister(e *waiter.Entry) {
mfd.t.ld.masterWaiter.EventUnregister(e)
}
// Readiness implements waiter.Waitable.Readiness.
func (mfd *masterFileDescription) Readiness(mask waiter.EventMask) waiter.EventMask {
return mfd.t.ld.masterReadiness()
}
// Read implements vfs.FileDescriptionImpl.Read.
func (mfd *masterFileDescription) Read(ctx context.Context, dst usermem.IOSequence, _ vfs.ReadOptions) (int64, error) {
return mfd.t.ld.outputQueueRead(ctx, dst)
}
// Write implements vfs.FileDescriptionImpl.Write.
func (mfd *masterFileDescription) Write(ctx context.Context, src usermem.IOSequence, _ vfs.WriteOptions) (int64, error) {
return mfd.t.ld.inputQueueWrite(ctx, src)
}
// Ioctl implements vfs.FileDescriptionImpl.Ioctl.
func (mfd *masterFileDescription) Ioctl(ctx context.Context, io usermem.IO, args arch.SyscallArguments) (uintptr, error) {
t := kernel.TaskFromContext(ctx)
if t == nil {
// ioctl(2) may only be called from a task goroutine.
return 0, syserror.ENOTTY
}
switch cmd := args[1].Uint(); cmd {
case linux.FIONREAD: // linux.FIONREAD == linux.TIOCINQ
// Get the number of bytes in the output queue read buffer.
return 0, mfd.t.ld.outputQueueReadSize(t, io, args)
case linux.TCGETS:
// N.B. TCGETS on the master actually returns the configuration
// of the replica end.
return mfd.t.ld.getTermios(t, args)
case linux.TCSETS:
// N.B. TCSETS on the master actually affects the configuration
// of the replica end.
return mfd.t.ld.setTermios(t, args)
case linux.TCSETSW:
// TODO(b/29356795): This should drain the output queue first.
return mfd.t.ld.setTermios(t, args)
case linux.TIOCGPTN:
nP := primitive.Uint32(mfd.t.n)
_, err := nP.CopyOut(t, args[2].Pointer())
return 0, err
case linux.TIOCSPTLCK:
// TODO(b/29356795): Implement pty locking. For now just pretend we do.
return 0, nil
case linux.TIOCGWINSZ:
return 0, mfd.t.ld.windowSize(t, args)
case linux.TIOCSWINSZ:
return 0, mfd.t.ld.setWindowSize(t, args)
case linux.TIOCSCTTY:
// Make the given terminal the controlling terminal of the
// calling process.
steal := args[2].Int() == 1
return 0, mfd.t.setControllingTTY(ctx, steal, true /* isMaster */, mfd.vfsfd.IsReadable())
case linux.TIOCNOTTY:
// Release this process's controlling terminal.
return 0, mfd.t.releaseControllingTTY(ctx, true /* isMaster */)
case linux.TIOCGPGRP:
// Get the foreground process group.
return mfd.t.foregroundProcessGroup(ctx, args, true /* isMaster */)
case linux.TIOCSPGRP:
// Set the foreground process group.
return mfd.t.setForegroundProcessGroup(ctx, args, true /* isMaster */)
default:
maybeEmitUnimplementedEvent(ctx, cmd)
return 0, syserror.ENOTTY
}
}
// SetStat implements vfs.FileDescriptionImpl.SetStat.
func (mfd *masterFileDescription) SetStat(ctx context.Context, opts vfs.SetStatOptions) error {
creds := auth.CredentialsFromContext(ctx)
fs := mfd.vfsfd.VirtualDentry().Mount().Filesystem()
return mfd.inode.SetStat(ctx, fs, creds, opts)
}
// Stat implements vfs.FileDescriptionImpl.Stat.
func (mfd *masterFileDescription) Stat(ctx context.Context, opts vfs.StatOptions) (linux.Statx, error) {
fs := mfd.vfsfd.VirtualDentry().Mount().Filesystem()
return mfd.inode.Stat(ctx, fs, opts)
}
// maybeEmitUnimplementedEvent emits unimplemented event if cmd is valid.
func maybeEmitUnimplementedEvent(ctx context.Context, cmd uint32) {
switch cmd {
case linux.TCGETS,
linux.TCSETS,
linux.TCSETSW,
linux.TCSETSF,
linux.TIOCGWINSZ,
linux.TIOCSWINSZ,
linux.TIOCSETD,
linux.TIOCSBRK,
linux.TIOCCBRK,
linux.TCSBRK,
linux.TCSBRKP,
linux.TIOCSTI,
linux.TIOCCONS,
linux.FIONBIO,
linux.TIOCEXCL,
linux.TIOCNXCL,
linux.TIOCGEXCL,
linux.TIOCGSID,
linux.TIOCGETD,
linux.TIOCVHANGUP,
linux.TIOCGDEV,
linux.TIOCMGET,
linux.TIOCMSET,
linux.TIOCMBIC,
linux.TIOCMBIS,
linux.TIOCGICOUNT,
linux.TCFLSH,
linux.TIOCSSERIAL,
linux.TIOCGPTPEER:
unimpl.EmitUnimplementedEvent(ctx)
}
}
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