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integration_linux_test.go
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integration_linux_test.go
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//+build linux
package vsock_test
import (
"fmt"
"net"
"os"
"regexp"
"strconv"
"testing"
"time"
"github.com/mdlayher/vsock"
"github.com/mdlayher/vsock/internal/vsutil"
"golang.org/x/net/nettest"
)
func TestIntegrationContextIDGuest(t *testing.T) {
if vsutil.IsHypervisor(t) {
t.Skip("skipping, machine is not a guest")
}
cid, err := vsock.ContextID()
if err != nil {
t.Fatalf("failed to retrieve guest's context ID: %v", err)
}
t.Logf("guest context ID: %d", cid)
// Guests should always have a context ID of 3 or more, since
// 0-2 are invalid or reserved.
if cid < 3 {
t.Fatalf("unexpected guest context ID: %d", cid)
}
}
func TestIntegrationContextIDHost(t *testing.T) {
if !vsutil.IsHypervisor(t) {
t.Skip("skipping, machine is not a hypervisor")
}
cid, err := vsock.ContextID()
if err != nil {
t.Fatalf("failed to retrieve host's context ID: %v", err)
}
t.Logf("host context ID: %d", cid)
if want, got := uint32(vsock.Host), cid; want != got {
t.Fatalf("unexpected host context ID:\n- want: %d\n- got: %d",
want, got)
}
}
func TestIntegrationNettestTestConn(t *testing.T) {
vsutil.SkipHostIntegration(t)
nettest.TestConn(t, makeVSockPipe())
}
var cidRe = regexp.MustCompile(`\S+\((\d+)\)`)
func TestIntegrationNettestTestListener(t *testing.T) {
vsutil.SkipHostIntegration(t)
// This test uses the nettest.TestListener API which is being built in:
// https://go-review.googlesource.com/c/net/+/123056.
//
// TODO(mdlayher): stop skipping this test once that CL lands.
mos := func() (ln net.Listener, dial func(string, string) (net.Conn, error), stop func(), err error) {
l, err := vsock.Listen(0)
if err != nil {
return nil, nil, nil, err
}
stop = func() {
// TODO(mdlayher): cancel context if we use vsock.DialContext.
_ = l.Close()
}
dial = func(_, addr string) (net.Conn, error) {
host, sport, err := net.SplitHostPort(addr)
if err != nil {
return nil, err
}
// Extract the CID value from the surrounding text.
scid := cidRe.FindStringSubmatch(host)
cid, err := strconv.Atoi(scid[1])
if err != nil {
return nil, err
}
port, err := strconv.Atoi(sport)
if err != nil {
return nil, err
}
return vsock.Dial(uint32(cid), uint32(port))
}
return l, dial, stop, nil
}
_ = mos
t.Skip("skipping, enable once https://go-review.googlesource.com/c/net/+/123056 is merged")
// nettest.TestListener(t, mos)
}
func newListener(t *testing.T) (*vsock.Listener, func()) {
t.Helper()
timer := time.AfterFunc(10*time.Second, func() {
panic("test took too long")
})
l, err := vsock.Listen(0)
if err != nil {
vsutil.SkipDeviceError(t, err)
t.Fatalf("failed to create vsock listener: %v", err)
}
return l, func() {
// Clean up the timer and this listener.
timer.Stop()
_ = l.Close()
}
}
func makeVSockPipe() nettest.MakePipe {
return makeLocalPipe(
func() (net.Listener, error) { return vsock.Listen(0) },
func(addr net.Addr) (net.Conn, error) {
a := addr.(*vsock.Addr)
return vsock.Dial(a.ContextID, a.Port)
},
)
}
// makeLocalPipe produces a nettest.MakePipe function using the input functions
// to configure a net.Listener and point a net.Conn at the listener.
//
// This function is proposed for inclusion in x/net/nettest, and should be
// removed from here if the proposal is accepted. See:
// https://github.com/golang/go/issues/30984.
func makeLocalPipe(
listen func() (net.Listener, error),
dial func(addr net.Addr) (net.Conn, error),
) nettest.MakePipe {
if listen == nil {
panic("nil listen function passed to makeLocalPipe")
}
if dial == nil {
dial = func(addr net.Addr) (net.Conn, error) {
return net.Dial(addr.Network(), addr.String())
}
}
// The majority of this code is taken from golang.org/x/net/nettest:
// https://go.googlesource.com/net/+/9e4ed9723b84cb6661bb04e4104f7bfb3ff5d016/nettest/conntest_test.go.
//
// Copyright 2016 The Go Authors. All rights reserved.
return func() (c1, c2 net.Conn, stop func(), err error) {
ln, err := listen()
if err != nil {
return nil, nil, nil, fmt.Errorf("failed to create local listener: %v", err)
}
// Start a connection between two endpoints.
var err1, err2 error
done := make(chan bool)
go func() {
c2, err2 = ln.Accept()
close(done)
}()
c1, err1 = dial(ln.Addr())
<-done
stop = func() {
if err1 == nil {
c1.Close()
}
if err2 == nil {
c2.Close()
}
ln.Close()
switch ln.Addr().Network() {
case "unix", "unixpacket":
os.Remove(ln.Addr().String())
}
}
switch {
case err1 != nil:
stop()
return nil, nil, nil, err1
case err2 != nil:
stop()
return nil, nil, nil, err2
default:
return c1, c2, stop, nil
}
}
}