43704ca888
Add a common NRI 'service' plugin. It takes care of relaying requests and respones to and from NRI (external NRI plugins) and the high-level containerd namespace-independent logic of applying NRI container adjustments and updates to actual CRI and other containers. The namespace-dependent details of the necessary container manipulation operations are to be implemented by namespace- specific adaptations. This NRI plugin defines the API which such adaptations need to implement. Signed-off-by: Krisztian Litkey <krisztian.litkey@intel.com>
99 lines
2.6 KiB
Go
99 lines
2.6 KiB
Go
//go:build !windows
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// +build !windows
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/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package net
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import (
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"fmt"
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"net"
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"os"
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syscall "golang.org/x/sys/unix"
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)
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const (
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local = 0
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peer = 1
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)
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// SocketPair contains the file descriptors of a connected pair of sockets.
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type SocketPair [2]int
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// NewSocketPair returns a connected pair of sockets.
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func NewSocketPair() (SocketPair, error) {
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fds, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
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if err != nil {
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return [2]int{-1, -1}, fmt.Errorf("failed to create socketpair: %w", err)
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}
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return fds, nil
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}
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// LocalFile returns the socketpair fd for local usage as an *os.File.
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func (fds SocketPair) LocalFile() *os.File {
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return os.NewFile(uintptr(fds[local]), fds.fileName()+"[0]")
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}
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// PeerFile returns the socketpair fd for peer usage as an *os.File.
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func (fds SocketPair) PeerFile() *os.File {
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return os.NewFile(uintptr(fds[peer]), fds.fileName()+"[1]")
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}
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// LocalConn returns a net.Conn for the local end of the socketpair.
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func (fds SocketPair) LocalConn() (net.Conn, error) {
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file := fds.LocalFile()
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defer file.Close()
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conn, err := net.FileConn(file)
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if err != nil {
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return nil, fmt.Errorf("failed to create net.Conn for %s[0]: %w", fds.fileName(), err)
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}
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return conn, nil
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}
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// PeerConn returns a net.Conn for the peer end of the socketpair.
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func (fds SocketPair) PeerConn() (net.Conn, error) {
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file := fds.PeerFile()
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defer file.Close()
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conn, err := net.FileConn(file)
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if err != nil {
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return nil, fmt.Errorf("failed to create net.Conn for %s[1]: %w", fds.fileName(), err)
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}
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return conn, nil
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}
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// Close closes both ends of the socketpair.
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func (fds SocketPair) Close() {
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fds.LocalClose()
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fds.PeerClose()
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}
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// LocalClose closes the local end of the socketpair.
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func (fds SocketPair) LocalClose() {
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syscall.Close(fds[local])
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}
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// PeerClose closes the peer end of the socketpair.
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func (fds SocketPair) PeerClose() {
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syscall.Close(fds[peer])
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}
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func (fds SocketPair) fileName() string {
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return fmt.Sprintf("socketpair-#%d:%d[0]", fds[local], fds[peer])
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}
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