pax_global_header00006660000000000000000000000064146567322410014524gustar00rootroot0000000000000052 comment=4c46424d73b556b3ea4bc5a7cec9e7376dcb2a73 netns-0.0.5/000077500000000000000000000000001465673224100126555ustar00rootroot00000000000000netns-0.0.5/.github/000077500000000000000000000000001465673224100142155ustar00rootroot00000000000000netns-0.0.5/.github/dependabot.yml000066400000000000000000000004231465673224100170440ustar00rootroot00000000000000version: 2 updates: - package-ecosystem: "github-actions" directory: "/" schedule: interval: "monthly" - package-ecosystem: "gomod" # Dependencies listed in go.mod directory: "/" # Location of package manifests schedule: interval: "weekly" netns-0.0.5/.github/workflows/000077500000000000000000000000001465673224100162525ustar00rootroot00000000000000netns-0.0.5/.github/workflows/test.yml000066400000000000000000000022471465673224100177610ustar00rootroot00000000000000name: test on: push: tags: - v* branches: - master - main pull_request: branches: - master - main jobs: test: permissions: contents: read # for actions/checkout to fetch code timeout-minutes: 10 strategy: matrix: # test against the "oldest" supported version and the current version # of go. Go 1.17 is kept in this matrix as it is the minimum version # specified in go.mod, and maintaining compatibility with go 1.17 is # currently not much of a burden. Most projects using this module are # using newer versions than that, so we can drop the old version if # it becomes too much of a burden. go-version: [1.17.x, stable] os: [ubuntu-20.04, ubuntu-22.04, windows-2022] runs-on: ${{ matrix.os }} steps: - name: Install Go uses: actions/setup-go@v5 with: go-version: ${{ matrix.go-version }} - name: Checkout code uses: actions/checkout@v4 - name: go mod tidy run: | go mod tidy git diff --exit-code - name: Test run: go test -exec "sudo -n" -v ./... netns-0.0.5/.github/workflows/validate.yml000066400000000000000000000027771465673224100206030ustar00rootroot00000000000000name: validate on: push: tags: - v* branches: - master - main pull_request: branches: - master - main jobs: linters: permissions: contents: read # for actions/checkout to fetch code pull-requests: read # for golangci/golangci-lint-action to fetch pull requests timeout-minutes: 10 strategy: matrix: # We only run on the latest version of go, as some linters may be # version-dependent (for example gofmt can change between releases). go-version: [stable] os: [ubuntu-22.04, windows-2022] runs-on: ${{ matrix.os }} steps: - name: Install Go uses: actions/setup-go@v5 with: go-version: ${{ matrix.go-version }} - name: Checkout code uses: actions/checkout@v4 - name: YAML Lint if: runner.os == 'Linux' uses: ibiqlik/action-yamllint@v3 with: format: auto - name: Golangci-lint uses: golangci/golangci-lint-action@v6 with: version: latest skip-cache: true args: --print-resources-usage --verbose # Optional: show only new issues if it's a pull request. The default value is `false`. # only-new-issues: true # Optional: if set to true then the action don't cache or restore ~/go/pkg. # skip-pkg-cache: true # Optional: if set to true then the action don't cache or restore ~/.cache/go-build. # skip-build-cache: true netns-0.0.5/.golangci.yml000066400000000000000000000005501465673224100152410ustar00rootroot00000000000000linters: enable: - errcheck - errorlint - gocritic - gosec - gosimple - govet - gci - misspell - nonamedreturns - staticcheck - unconvert - unparam - unused - whitespace linters-settings: gci: sections: - standard - default - prefix(github.com/vishvananda) run: timeout: 5m netns-0.0.5/.yamllint.yml000066400000000000000000000002041465673224100153030ustar00rootroot00000000000000--- extends: default rules: document-start: disable line-length: disable truthy: ignore: | .github/workflows/*.yml netns-0.0.5/LICENSE000066400000000000000000000250541465673224100136700ustar00rootroot00000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. "Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files. "Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types. "Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below). "Derivative Works" shall mean any work, whether in Source or Object form, that is based on (or derived from) the Work and for which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship. For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof. "Contribution" shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, that is intentionally submitted to Licensor for inclusion in the Work by the copyright owner or by an individual or Legal Entity authorized to submit on behalf of the copyright owner. For the purposes of this definition, "submitted" means any form of electronic, verbal, or written communication sent to the Licensor or its representatives, including but not limited to communication on electronic mailing lists, source code control systems, and issue tracking systems that are managed by, or on behalf of, the Licensor for the purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in writing by the copyright owner as "Not a Contribution." "Contributor" shall mean Licensor and any individual or Legal Entity on behalf of whom a Contribution has been received by Licensor and subsequently incorporated within the Work. 2. Grant of Copyright License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare Derivative Works of, publicly display, publicly perform, sublicense, and distribute the Work and such Derivative Works in Source or Object form. 3. Grant of Patent License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer the Work, where such license applies only to those patent claims licensable by such Contributor that are necessarily infringed by their Contribution(s) alone or by combination of their Contribution(s) with the Work to which such Contribution(s) was submitted. If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated within the Work constitutes direct or contributory patent infringement, then any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed. 4. Redistribution. You may reproduce and distribute copies of the Work or Derivative Works thereof in any medium, with or without modifications, and in Source or Object form, provided that You meet the following conditions: (a) You must give any other recipients of the Work or Derivative Works a copy of this License; and (b) You must cause any modified files to carry prominent notices stating that You changed the files; and (c) You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works; and (d) If the Work includes a "NOTICE" text file as part of its distribution, then any Derivative Works that You distribute must include a readable copy of the attribution notices contained within such NOTICE file, excluding those notices that do not pertain to any part of the Derivative Works, in at least one of the following places: within a NOTICE text file distributed as part of the Derivative Works; within the Source form or documentation, if provided along with the Derivative Works; or, within a display generated by the Derivative Works, if and wherever such third-party notices normally appear. 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You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License. 8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages. 9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability. END OF TERMS AND CONDITIONS Copyright 2014 Vishvananda Ishaya. Copyright 2014 Docker, Inc. 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. netns-0.0.5/README.md000066400000000000000000000020411465673224100141310ustar00rootroot00000000000000# netns - network namespaces in go # The netns package provides an ultra-simple interface for handling network namespaces in go. Changing namespaces requires elevated privileges, so in most cases this code needs to be run as root. ## Local Build and Test ## You can use go get command: go get github.com/vishvananda/netns Testing (requires root): sudo -E go test github.com/vishvananda/netns ## Example ## ```go package main import ( "fmt" "net" "runtime" "github.com/vishvananda/netns" ) func main() { // Lock the OS Thread so we don't accidentally switch namespaces runtime.LockOSThread() defer runtime.UnlockOSThread() // Save the current network namespace origns, _ := netns.Get() defer origns.Close() // Create a new network namespace newns, _ := netns.New() defer newns.Close() // Do something with the network namespace ifaces, _ := net.Interfaces() fmt.Printf("Interfaces: %v\n", ifaces) // Switch back to the original namespace netns.Set(origns) } ``` netns-0.0.5/doc.go000066400000000000000000000010401465673224100137440ustar00rootroot00000000000000// Package netns allows ultra-simple network namespace handling. NsHandles // can be retrieved and set. Note that the current namespace is thread // local so actions that set and reset namespaces should use LockOSThread // to make sure the namespace doesn't change due to a goroutine switch. // It is best to close NsHandles when you are done with them. This can be // accomplished via a `defer ns.Close()` on the handle. Changing namespaces // requires elevated privileges, so in most cases this code needs to be run // as root. package netns netns-0.0.5/go.mod000066400000000000000000000001161465673224100137610ustar00rootroot00000000000000module github.com/vishvananda/netns go 1.17 require golang.org/x/sys v0.2.0 netns-0.0.5/go.sum000066400000000000000000000002271465673224100140110ustar00rootroot00000000000000golang.org/x/sys v0.2.0 h1:ljd4t30dBnAvMZaQCevtY0xLLD0A+bRZXbgLMLU1F/A= golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= netns-0.0.5/netns_linux.go000066400000000000000000000207061465673224100155570ustar00rootroot00000000000000package netns import ( "fmt" "os" "path" "path/filepath" "strconv" "strings" "golang.org/x/sys/unix" ) // Deprecated: use golang.org/x/sys/unix pkg instead. const ( CLONE_NEWUTS = unix.CLONE_NEWUTS /* New utsname group? */ CLONE_NEWIPC = unix.CLONE_NEWIPC /* New ipcs */ CLONE_NEWUSER = unix.CLONE_NEWUSER /* New user namespace */ CLONE_NEWPID = unix.CLONE_NEWPID /* New pid namespace */ CLONE_NEWNET = unix.CLONE_NEWNET /* New network namespace */ CLONE_IO = unix.CLONE_IO /* Get io context */ ) const bindMountPath = "/run/netns" /* Bind mount path for named netns */ // Setns sets namespace using golang.org/x/sys/unix.Setns. // // Deprecated: Use golang.org/x/sys/unix.Setns instead. func Setns(ns NsHandle, nstype int) error { return unix.Setns(int(ns), nstype) } // Set sets the current network namespace to the namespace represented // by NsHandle. func Set(ns NsHandle) error { return unix.Setns(int(ns), unix.CLONE_NEWNET) } // New creates a new network namespace, sets it as current and returns // a handle to it. func New() (NsHandle, error) { if err := unix.Unshare(unix.CLONE_NEWNET); err != nil { return -1, err } return Get() } // NewNamed creates a new named network namespace, sets it as current, // and returns a handle to it func NewNamed(name string) (NsHandle, error) { if _, err := os.Stat(bindMountPath); os.IsNotExist(err) { err = os.MkdirAll(bindMountPath, 0o755) if err != nil { return None(), err } } newNs, err := New() if err != nil { return None(), err } namedPath := path.Join(bindMountPath, name) f, err := os.OpenFile(namedPath, os.O_CREATE|os.O_EXCL, 0o444) if err != nil { newNs.Close() return None(), err } f.Close() nsPath := fmt.Sprintf("/proc/%d/task/%d/ns/net", os.Getpid(), unix.Gettid()) err = unix.Mount(nsPath, namedPath, "bind", unix.MS_BIND, "") if err != nil { newNs.Close() return None(), err } return newNs, nil } // DeleteNamed deletes a named network namespace func DeleteNamed(name string) error { namedPath := path.Join(bindMountPath, name) err := unix.Unmount(namedPath, unix.MNT_DETACH) if err != nil { return err } return os.Remove(namedPath) } // Get gets a handle to the current threads network namespace. func Get() (NsHandle, error) { return GetFromThread(os.Getpid(), unix.Gettid()) } // GetFromPath gets a handle to a network namespace // identified by the path func GetFromPath(path string) (NsHandle, error) { fd, err := unix.Open(path, unix.O_RDONLY|unix.O_CLOEXEC, 0) if err != nil { return -1, err } return NsHandle(fd), nil } // GetFromName gets a handle to a named network namespace such as one // created by `ip netns add`. func GetFromName(name string) (NsHandle, error) { return GetFromPath(filepath.Join(bindMountPath, name)) } // GetFromPid gets a handle to the network namespace of a given pid. func GetFromPid(pid int) (NsHandle, error) { return GetFromPath(fmt.Sprintf("/proc/%d/ns/net", pid)) } // GetFromThread gets a handle to the network namespace of a given pid and tid. func GetFromThread(pid, tid int) (NsHandle, error) { return GetFromPath(fmt.Sprintf("/proc/%d/task/%d/ns/net", pid, tid)) } // GetFromDocker gets a handle to the network namespace of a docker container. // Id is prefixed matched against the running docker containers, so a short // identifier can be used as long as it isn't ambiguous. func GetFromDocker(id string) (NsHandle, error) { pid, err := getPidForContainer(id) if err != nil { return -1, err } return GetFromPid(pid) } // borrowed from docker/utils/utils.go func findCgroupMountpoint(cgroupType string) (int, string, error) { output, err := os.ReadFile("/proc/mounts") if err != nil { return -1, "", err } // /proc/mounts has 6 fields per line, one mount per line, e.g. // cgroup /sys/fs/cgroup/devices cgroup rw,relatime,devices 0 0 for _, line := range strings.Split(string(output), "\n") { parts := strings.Split(line, " ") if len(parts) == 6 { switch parts[2] { case "cgroup2": return 2, parts[1], nil case "cgroup": for _, opt := range strings.Split(parts[3], ",") { if opt == cgroupType { return 1, parts[1], nil } } } } } return -1, "", fmt.Errorf("cgroup mountpoint not found for %s", cgroupType) } // Returns the relative path to the cgroup docker is running in. // borrowed from docker/utils/utils.go // modified to get the docker pid instead of using /proc/self func getDockerCgroup(cgroupVer int, cgroupType string) (string, error) { dockerpid, err := os.ReadFile("/var/run/docker.pid") if err != nil { return "", err } result := strings.Split(string(dockerpid), "\n") if len(result) == 0 || len(result[0]) == 0 { return "", fmt.Errorf("docker pid not found in /var/run/docker.pid") } pid, err := strconv.Atoi(result[0]) if err != nil { return "", err } output, err := os.ReadFile(fmt.Sprintf("/proc/%d/cgroup", pid)) if err != nil { return "", err } for _, line := range strings.Split(string(output), "\n") { parts := strings.Split(line, ":") // any type used by docker should work if (cgroupVer == 1 && parts[1] == cgroupType) || (cgroupVer == 2 && parts[1] == "") { return parts[2], nil } } return "", fmt.Errorf("cgroup '%s' not found in /proc/%d/cgroup", cgroupType, pid) } // Returns the first pid in a container. // borrowed from docker/utils/utils.go // modified to only return the first pid // modified to glob with id // modified to search for newer docker containers // modified to look for cgroups v2 func getPidForContainer(id string) (int, error) { pid := 0 // memory is chosen randomly, any cgroup used by docker works cgroupType := "memory" cgroupVer, cgroupRoot, err := findCgroupMountpoint(cgroupType) if err != nil { return pid, err } cgroupDocker, err := getDockerCgroup(cgroupVer, cgroupType) if err != nil { return pid, err } id += "*" var pidFile string switch cgroupVer { case 1: pidFile = "tasks" case 2: pidFile = "cgroup.procs" default: return -1, fmt.Errorf("Invalid cgroup version '%d'", cgroupVer) } attempts := []string{ filepath.Join(cgroupRoot, cgroupDocker, id, pidFile), // With more recent lxc versions use, cgroup will be in lxc/ filepath.Join(cgroupRoot, cgroupDocker, "lxc", id, pidFile), // With more recent docker, cgroup will be in docker/ filepath.Join(cgroupRoot, cgroupDocker, "docker", id, pidFile), // Even more recent docker versions under systemd use docker-.scope/ filepath.Join(cgroupRoot, "system.slice", "docker-"+id+".scope", pidFile), // Even more recent docker versions under cgroup/systemd/docker// filepath.Join(cgroupRoot, "..", "systemd", "docker", id, pidFile), // Kubernetes with docker and CNI is even more different. Works for BestEffort and Burstable QoS filepath.Join(cgroupRoot, "..", "systemd", "kubepods", "*", "pod*", id, pidFile), // Same as above but for Guaranteed QoS filepath.Join(cgroupRoot, "..", "systemd", "kubepods", "pod*", id, pidFile), // Another flavor of containers location in recent kubernetes 1.11+. Works for BestEffort and Burstable QoS filepath.Join(cgroupRoot, cgroupDocker, "kubepods.slice", "*.slice", "*", "docker-"+id+".scope", pidFile), // Same as above but for Guaranteed QoS filepath.Join(cgroupRoot, cgroupDocker, "kubepods.slice", "*", "docker-"+id+".scope", pidFile), // When runs inside of a container with recent kubernetes 1.11+. Works for BestEffort and Burstable QoS filepath.Join(cgroupRoot, "kubepods.slice", "*.slice", "*", "docker-"+id+".scope", pidFile), // Same as above but for Guaranteed QoS filepath.Join(cgroupRoot, "kubepods.slice", "*", "docker-"+id+".scope", pidFile), // Support for nerdctl filepath.Join(cgroupRoot, "system.slice", "nerdctl-"+id+".scope", pidFile), // Support for finch filepath.Join(cgroupRoot, "..", "systemd", "finch", id, pidFile), } var filename string for _, attempt := range attempts { filenames, _ := filepath.Glob(attempt) if len(filenames) > 1 { return pid, fmt.Errorf("Ambiguous id supplied: %v", filenames) } else if len(filenames) == 1 { filename = filenames[0] break } } if filename == "" { return pid, fmt.Errorf("Unable to find container: %v", id[:len(id)-1]) } output, err := os.ReadFile(filename) if err != nil { return pid, err } result := strings.Split(string(output), "\n") if len(result) == 0 || len(result[0]) == 0 { return pid, fmt.Errorf("No pid found for container") } pid, err = strconv.Atoi(result[0]) if err != nil { return pid, fmt.Errorf("Invalid pid '%s': %w", result[0], err) } return pid, nil } netns-0.0.5/netns_linux_test.go000066400000000000000000000022001465673224100166030ustar00rootroot00000000000000package netns import ( "runtime" "sync" "testing" ) func TestGetNewSetDelete(t *testing.T) { runtime.LockOSThread() defer runtime.UnlockOSThread() origns, err := Get() if err != nil { t.Fatal(err) } newns, err := New() if err != nil { t.Fatal(err) } if origns.Equal(newns) { t.Fatal("New ns failed") } if err := Set(origns); err != nil { t.Fatal(err) } if err := newns.Close(); err != nil { t.Error("Failed to close ns", err) } if newns.IsOpen() { t.Fatal("newns still open after close", newns) } ns, err := Get() if err != nil { t.Fatal(err) } if !ns.Equal(origns) { t.Fatal("Reset ns failed", origns, newns, ns) } } func TestNone(t *testing.T) { ns := None() if ns.IsOpen() { t.Fatal("None ns is open", ns) } } func TestThreaded(t *testing.T) { ncpu := runtime.GOMAXPROCS(-1) if ncpu < 2 { t.Skip("-cpu=2 or larger required") } // Lock this thread simply to ensure other threads get used. runtime.LockOSThread() defer runtime.UnlockOSThread() wg := &sync.WaitGroup{} for i := 0; i < ncpu; i++ { wg.Add(1) go func() { defer wg.Done() TestGetNewSetDelete(t) }() } wg.Wait() } netns-0.0.5/netns_others.go000066400000000000000000000021361465673224100157210ustar00rootroot00000000000000//go:build !linux // +build !linux package netns import "errors" var ErrNotImplemented = errors.New("not implemented") // Setns sets namespace using golang.org/x/sys/unix.Setns on Linux. It // is not implemented on other platforms. // // Deprecated: Use golang.org/x/sys/unix.Setns instead. func Setns(ns NsHandle, nstype int) error { return ErrNotImplemented } func Set(ns NsHandle) error { return ErrNotImplemented } func New() (NsHandle, error) { return -1, ErrNotImplemented } func NewNamed(name string) (NsHandle, error) { return -1, ErrNotImplemented } func DeleteNamed(name string) error { return ErrNotImplemented } func Get() (NsHandle, error) { return -1, ErrNotImplemented } func GetFromPath(path string) (NsHandle, error) { return -1, ErrNotImplemented } func GetFromName(name string) (NsHandle, error) { return -1, ErrNotImplemented } func GetFromPid(pid int) (NsHandle, error) { return -1, ErrNotImplemented } func GetFromThread(pid int, tid int) (NsHandle, error) { return -1, ErrNotImplemented } func GetFromDocker(id string) (NsHandle, error) { return -1, ErrNotImplemented } netns-0.0.5/nshandle_linux.go000066400000000000000000000033331465673224100162210ustar00rootroot00000000000000package netns import ( "fmt" "golang.org/x/sys/unix" ) // NsHandle is a handle to a network namespace. It can be cast directly // to an int and used as a file descriptor. type NsHandle int // Equal determines if two network handles refer to the same network // namespace. This is done by comparing the device and inode that the // file descriptors point to. func (ns NsHandle) Equal(other NsHandle) bool { if ns == other { return true } var s1, s2 unix.Stat_t if err := unix.Fstat(int(ns), &s1); err != nil { return false } if err := unix.Fstat(int(other), &s2); err != nil { return false } return (s1.Dev == s2.Dev) && (s1.Ino == s2.Ino) } // String shows the file descriptor number and its dev and inode. func (ns NsHandle) String() string { if ns == -1 { return "NS(none)" } var s unix.Stat_t if err := unix.Fstat(int(ns), &s); err != nil { return fmt.Sprintf("NS(%d: unknown)", ns) } return fmt.Sprintf("NS(%d: %d, %d)", ns, s.Dev, s.Ino) } // UniqueId returns a string which uniquely identifies the namespace // associated with the network handle. func (ns NsHandle) UniqueId() string { if ns == -1 { return "NS(none)" } var s unix.Stat_t if err := unix.Fstat(int(ns), &s); err != nil { return "NS(unknown)" } return fmt.Sprintf("NS(%d:%d)", s.Dev, s.Ino) } // IsOpen returns true if Close() has not been called. func (ns NsHandle) IsOpen() bool { return ns != -1 } // Close closes the NsHandle and resets its file descriptor to -1. // It is not safe to use an NsHandle after Close() is called. func (ns *NsHandle) Close() error { if err := unix.Close(int(*ns)); err != nil { return err } *ns = -1 return nil } // None gets an empty (closed) NsHandle. func None() NsHandle { return NsHandle(-1) } netns-0.0.5/nshandle_others.go000066400000000000000000000023511465673224100163650ustar00rootroot00000000000000//go:build !linux // +build !linux package netns // NsHandle is a handle to a network namespace. It can only be used on Linux, // but provides stub methods on other platforms. type NsHandle int // Equal determines if two network handles refer to the same network // namespace. It is only implemented on Linux. func (ns NsHandle) Equal(_ NsHandle) bool { return false } // String shows the file descriptor number and its dev and inode. // It is only implemented on Linux, and returns "NS(none)" on other // platforms. func (ns NsHandle) String() string { return "NS(none)" } // UniqueId returns a string which uniquely identifies the namespace // associated with the network handle. It is only implemented on Linux, // and returns "NS(none)" on other platforms. func (ns NsHandle) UniqueId() string { return "NS(none)" } // IsOpen returns true if Close() has not been called. It is only implemented // on Linux and always returns false on other platforms. func (ns NsHandle) IsOpen() bool { return false } // Close closes the NsHandle and resets its file descriptor to -1. // It is only implemented on Linux. func (ns *NsHandle) Close() error { return nil } // None gets an empty (closed) NsHandle. func None() NsHandle { return NsHandle(-1) }