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// Copyright 2018 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 kernel
import (
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/nsfs"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
"gvisor.dev/gvisor/pkg/sync"
)
// UTSNamespace represents a UTS namespace, a holder of two system identifiers:
// the hostname and domain name.
//
// +stateify savable
type UTSNamespace struct {
// mu protects all fields below.
mu sync.Mutex `state:"nosave"`
hostName string
domainName string
// userns is the user namespace associated with the UTSNamespace.
// Privileged operations on this UTSNamespace must have appropriate
// capabilities in userns.
//
// userns is immutable.
userns *auth.UserNamespace
inode *nsfs.Inode
}
// NewUTSNamespace creates a new UTS namespace.
func NewUTSNamespace(hostName, domainName string, userns *auth.UserNamespace) *UTSNamespace {
return &UTSNamespace{
hostName: hostName,
domainName: domainName,
userns: userns,
}
}
// UTSNamespace returns the task's UTS namespace.
func (t *Task) UTSNamespace() *UTSNamespace {
t.mu.Lock()
defer t.mu.Unlock()
return t.utsns
}
// GetUTSNamespace takes a reference on the task UTS namespace and
// returns it. It will return nil if the task isn't alive.
func (t *Task) GetUTSNamespace() *UTSNamespace {
t.mu.Lock()
defer t.mu.Unlock()
if t.utsns != nil {
t.utsns.IncRef()
}
return t.utsns
}
// HostName returns the host name of this UTS namespace.
func (u *UTSNamespace) HostName() string {
u.mu.Lock()
defer u.mu.Unlock()
return u.hostName
}
// SetHostName sets the host name of this UTS namespace.
func (u *UTSNamespace) SetHostName(host string) {
u.mu.Lock()
defer u.mu.Unlock()
u.hostName = host
}
// DomainName returns the domain name of this UTS namespace.
func (u *UTSNamespace) DomainName() string {
u.mu.Lock()
defer u.mu.Unlock()
return u.domainName
}
// SetDomainName sets the domain name of this UTS namespace.
func (u *UTSNamespace) SetDomainName(domain string) {
u.mu.Lock()
defer u.mu.Unlock()
u.domainName = domain
}
// UserNamespace returns the user namespace associated with this UTS namespace.
func (u *UTSNamespace) UserNamespace() *auth.UserNamespace {
u.mu.Lock()
defer u.mu.Unlock()
return u.userns
}
// Type implements nsfs.Namespace.Type.
func (u *UTSNamespace) Type() string {
return "uts"
}
// Destroy implements nsfs.Namespace.Destroy.
func (u *UTSNamespace) Destroy(ctx context.Context) {}
// SetInode sets the nsfs `inode` to the UTS namespace.
func (u *UTSNamespace) SetInode(inode *nsfs.Inode) {
u.mu.Lock()
defer u.mu.Unlock()
u.inode = inode
}
// GetInode returns the nsfs inode associated with the UTS namespace.
func (u *UTSNamespace) GetInode() *nsfs.Inode {
u.mu.Lock()
defer u.mu.Unlock()
return u.inode
}
// IncRef increments the Namespace's refcount.
func (u *UTSNamespace) IncRef() {
u.mu.Lock()
defer u.mu.Unlock()
u.inode.IncRef()
}
// DecRef decrements the namespace's refcount.
func (u *UTSNamespace) DecRef(ctx context.Context) {
u.mu.Lock()
defer u.mu.Unlock()
u.inode.DecRef(ctx)
}
// Clone makes a copy of this UTS namespace, associating the given user
// namespace.
func (u *UTSNamespace) Clone(userns *auth.UserNamespace) *UTSNamespace {
u.mu.Lock()
defer u.mu.Unlock()
return &UTSNamespace{
hostName: u.hostName,
domainName: u.domainName,
userns: userns,
}
}
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