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cnishim.go
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cnishim.go
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package cni
// contains code for cnishim - one that gets called as the cni Plugin
// This does not do the real cni work. This is just the client to the cniserver
// that does the real work.
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"runtime"
"strings"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/cni/pkg/types/current"
"github.com/openvswitch/ovn-kubernetes/go-controller/pkg/config"
)
// Plugin is the structure to hold the endpoint information and the corresponding
// functions to use it
type Plugin struct {
socketPath string
}
// NewCNIPlugin creates the internal Plugin object
func NewCNIPlugin(socketPath string) *Plugin {
if len(socketPath) == 0 {
socketPath = serverSocketPath
}
return &Plugin{socketPath: socketPath}
}
// Create and fill a Request with this Plugin's environment and stdin which
// contain the CNI variables and configuration
func newCNIRequest(args *skel.CmdArgs) *Request {
envMap := make(map[string]string)
for _, item := range os.Environ() {
idx := strings.Index(item, "=")
if idx > 0 {
envMap[strings.TrimSpace(item[:idx])] = item[idx+1:]
}
}
return &Request{
Env: envMap,
Config: args.StdinData,
}
}
// Send a CNI request to the CNI server via JSON + HTTP over a root-owned unix socket,
// and return the result
func (p *Plugin) doCNI(url string, req *Request) ([]byte, error) {
data, err := json.Marshal(req)
if err != nil {
return nil, fmt.Errorf("failed to marshal CNI request %v: %v", req, err)
}
client := &http.Client{
Transport: &http.Transport{
Dial: func(proto, addr string) (net.Conn, error) {
var conn net.Conn
if runtime.GOOS != "windows" {
conn, err = net.Dial("unix", p.socketPath)
} else {
conn, err = net.Dial("tcp", serverTCPAddress)
}
return conn, err
},
},
}
resp, err := client.Post(url, "application/json", bytes.NewReader(data))
if err != nil {
return nil, fmt.Errorf("failed to send CNI request: %v", err)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("failed to read CNI result: %v", err)
}
if resp.StatusCode != 200 {
return nil, fmt.Errorf("CNI request failed with status %v: '%s'", resp.StatusCode, string(body))
}
return body, nil
}
// CmdAdd is the callback for 'add' cni calls from skel
func (p *Plugin) CmdAdd(args *skel.CmdArgs) error {
// read the config stdin args to obtain cniVersion
conf, err := config.ReadCNIConfig(args.StdinData)
if err != nil {
return fmt.Errorf("invalid stdin args")
}
req := newCNIRequest(args)
body, err := p.doCNI("http://dummy/", req)
if err != nil {
return err
}
result, err := current.NewResult(body)
if err != nil {
return fmt.Errorf("failed to unmarshal response '%s': %v", string(body), err)
}
return types.PrintResult(result, conf.CNIVersion)
}
// CmdDel is the callback for 'teardown' cni calls from skel
func (p *Plugin) CmdDel(args *skel.CmdArgs) error {
_, err := p.doCNI("http://dummy/", newCNIRequest(args))
return err
}