103 lines
2.7 KiB
Go
103 lines
2.7 KiB
Go
// Copyright 2018 Google Inc.
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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 kernel
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import (
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"sync"
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"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/auth"
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)
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// UTSNamespace represents a UTS namespace, a holder of two system identifiers:
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// the hostname and domain name.
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//
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// +stateify savable
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type UTSNamespace struct {
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// mu protects all fields below.
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mu sync.Mutex `state:"nosave"`
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hostName string
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domainName string
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// userns is the user namespace associated with the UTSNamespace.
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// Privileged operations on this UTSNamespace must have appropriate
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// capabilities in userns.
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//
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// userns is immutable.
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userns *auth.UserNamespace
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}
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// NewUTSNamespace creates a new UTS namespace.
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func NewUTSNamespace(hostName, domainName string, userns *auth.UserNamespace) *UTSNamespace {
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return &UTSNamespace{
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hostName: hostName,
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domainName: domainName,
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userns: userns,
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}
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}
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// UTSNamespace returns the task's UTS namespace.
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func (t *Task) UTSNamespace() *UTSNamespace {
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t.mu.Lock()
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defer t.mu.Unlock()
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return t.utsns
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}
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// HostName returns the host name of this UTS namespace.
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func (u *UTSNamespace) HostName() string {
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u.mu.Lock()
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defer u.mu.Unlock()
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return u.hostName
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}
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// SetHostName sets the host name of this UTS namespace.
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func (u *UTSNamespace) SetHostName(host string) {
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u.mu.Lock()
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defer u.mu.Unlock()
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u.hostName = host
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}
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// DomainName returns the domain name of this UTS namespace.
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func (u *UTSNamespace) DomainName() string {
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u.mu.Lock()
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defer u.mu.Unlock()
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return u.domainName
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}
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// SetDomainName sets the domain name of this UTS namespace.
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func (u *UTSNamespace) SetDomainName(domain string) {
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u.mu.Lock()
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defer u.mu.Unlock()
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u.domainName = domain
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}
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// UserNamespace returns the user namespace associated with this UTS namespace.
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func (u *UTSNamespace) UserNamespace() *auth.UserNamespace {
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u.mu.Lock()
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defer u.mu.Unlock()
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return u.userns
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}
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// Clone makes a copy of this UTS namespace, associating the given user
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// namespace.
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func (u *UTSNamespace) Clone(userns *auth.UserNamespace) *UTSNamespace {
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u.mu.Lock()
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defer u.mu.Unlock()
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return &UTSNamespace{
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hostName: u.hostName,
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domainName: u.domainName,
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userns: userns,
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}
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}
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