1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930
|
//go:build linux
// +build linux
package netlink_test
import (
"errors"
"fmt"
"math/rand"
"net"
"os"
"os/exec"
"os/user"
"sync"
"testing"
"time"
"github.com/google/go-cmp/cmp"
"github.com/google/go-cmp/cmp/cmpopts"
"github.com/mdlayher/netlink"
"github.com/mdlayher/netlink/nlenc"
"golang.org/x/net/bpf"
"golang.org/x/sys/unix"
)
func TestIntegrationConn(t *testing.T) {
t.Parallel()
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
t.Fatalf("failed to dial netlink: %v", err)
}
// Ask to send us an acknowledgement, which will contain an
// error code (or success) and a copy of the payload we sent in
req := netlink.Message{
Header: netlink.Header{
Flags: netlink.Request | netlink.Acknowledge,
},
}
// Perform a request, receive replies, and validate the replies
msgs, err := c.Execute(req)
if err != nil {
t.Fatalf("failed to execute request: %v", err)
}
if want, got := 1, len(msgs); want != got {
t.Fatalf("unexpected message count from netlink:\n- want: %v\n- got: %v",
want, got)
}
if err := c.Close(); err != nil {
t.Fatalf("error closing netlink connection: %v", err)
}
m := msgs[0]
if want, got := 0, int(nlenc.Uint32(m.Data[0:4])); want != got {
t.Fatalf("unexpected error code:\n- want: %v\n- got: %v", want, got)
}
if want, got := 36, int(m.Header.Length); want != got {
t.Fatalf("unexpected header length:\n- want: %v\n- got: %v", want, got)
}
if want, got := netlink.Error, m.Header.Type; want != got {
t.Fatalf("unexpected header type:\n- want: %v\n- got: %v", want, got)
}
// Recent kernel versions (> 4.14) return a 256 here instead of a 0
if want, wantAlt, got := 0, 256, int(m.Header.Flags); want != got && wantAlt != got {
t.Fatalf("unexpected header flags:\n- want: %v or %v\n- got: %v", want, wantAlt, got)
}
// Sequence number is not checked because we assign one at random when
// a Conn is created. PID is not checked because running tests in parallel
// results in only the first socket getting assigned the process's PID as
// its netlink PID.
// Skip error code and unmarshal the copy of request sent back by
// skipping the success code at bytes 0-4
var reply netlink.Message
if err := (&reply).UnmarshalBinary(m.Data[4:]); err != nil {
t.Fatalf("failed to unmarshal reply: %v", err)
}
if want, got := req.Header.Flags, reply.Header.Flags; want != got {
t.Fatalf("unexpected copy header flags:\n- want: %v\n- got: %v", want, got)
}
if want, got := len(req.Data), len(reply.Data); want != got {
t.Fatalf("unexpected copy header data length:\n- want: %v\n- got: %v", want, got)
}
}
func TestIntegrationConnConcurrentManyConns(t *testing.T) {
t.Parallel()
skipShort(t)
// Execute many concurrent operations on several netlink.Conns to ensure
// the kernel is sending and receiving netlink messages to/from the correct
// file descriptor.
//
// See: http://lists.infradead.org/pipermail/libnl/2017-February/002293.html.
execN := func(n int) {
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
panicf("failed to dial generic netlink: %v", err)
}
defer c.Close()
req := netlink.Message{
Header: netlink.Header{
Flags: netlink.Request | netlink.Acknowledge,
},
}
for i := 0; i < n; i++ {
msgs, err := c.Execute(req)
if err != nil {
panicf("failed to send request: %v", err)
}
if l := len(msgs); l != 1 {
panicf("unexpected number of reply messages: %d", l)
}
}
}
const (
workers = 16
iterations = 10000
)
var wg sync.WaitGroup
wg.Add(workers)
for i := 0; i < workers; i++ {
go func() {
defer wg.Done()
execN(iterations)
}()
}
wg.Wait()
}
func TestIntegrationConnConcurrentOneConn(t *testing.T) {
t.Parallel()
skipShort(t)
// Execute many concurrent operations on a single netlink.Conn.
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
t.Fatalf("failed to dial netlink: %v", err)
}
execN := func(n int) {
req := netlink.Message{
Header: netlink.Header{
Flags: netlink.Request | netlink.Acknowledge,
},
}
var res netlink.Message
for i := 0; i < n; i++ {
// Don't expect a "valid" request/reply because we are not serializing
// our Send/Receive calls via Execute or with an external lock.
//
// Just verify that we don't trigger the race detector, we got a
// valid netlink response, and it can be decoded as a valid
// netlink message.
if _, err := c.Send(req); err != nil {
panicf("failed to send request: %v", err)
}
msgs, err := c.Receive()
if err != nil {
panicf("failed to receive reply: %v", err)
}
if l := len(msgs); l != 1 {
panicf("unexpected number of reply messages: %d", l)
}
if err := res.UnmarshalBinary(msgs[0].Data[4:]); err != nil {
panicf("failed to unmarshal reply: %v", err)
}
}
}
const (
workers = 16
iterations = 10000
)
var wg sync.WaitGroup
wg.Add(workers)
defer wg.Wait()
for i := 0; i < workers; i++ {
go func() {
defer wg.Done()
execN(iterations)
}()
}
}
func TestIntegrationConnConcurrentClosePreventsReceive(t *testing.T) {
t.Parallel()
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
t.Fatalf("failed to dial netlink: %v", err)
}
// Verify this test cannot block indefinitely due to Receive hanging after
// a call to Close is completed.
timer := time.AfterFunc(10*time.Second, func() {
panic("test took too long")
})
defer timer.Stop()
var wg sync.WaitGroup
wg.Add(1)
defer wg.Wait()
// The intent of this test is to schedule Close before Receive can ever
// happen, resulting in EBADF. The test below covers the opposite case.
sigC := make(chan struct{})
go func() {
defer wg.Done()
<-sigC
_, err := c.Receive()
if err == nil {
panicf("expected an error, but none occurred")
}
// Expect an error due to file descriptor being closed.
serr := err.(*netlink.OpError).Err.(*os.SyscallError).Err
if diff := cmp.Diff(unix.EBADF, serr); diff != "" {
panicf("unexpected error from receive (-want +got):\n%s", diff)
}
}()
if err := c.Close(); err != nil {
t.Fatalf("failed to close: %v", err)
}
close(sigC)
}
func TestIntegrationConnConcurrentCloseUnblocksReceive(t *testing.T) {
t.Parallel()
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
t.Fatalf("failed to dial netlink: %v", err)
}
// Verify this test cannot block indefinitely due to Receive hanging after
// a call to Close is completed.
timer := time.AfterFunc(10*time.Second, func() {
panic("test took too long")
})
defer timer.Stop()
var wg sync.WaitGroup
wg.Add(1)
defer wg.Wait()
// Try to enforce that Receive is scheduled before Close.
sigC := make(chan struct{})
go func() {
defer wg.Done()
// Multiple Close operations should be a no-op.
<-sigC
for i := 0; i < 5; i++ {
time.Sleep(50 * time.Millisecond)
if err := c.Close(); err != nil {
panicf("failed to close: %v", err)
}
}
}()
close(sigC)
_, err = c.Receive()
if err == nil {
t.Fatalf("expected an error, but none occurred")
}
// Expect an error due to the use of a closed file descriptor. Unfortunately
// there doesn't seem to be a typed error for this.
//
// Previous versions of this code would wrap the internal/poll error which
// *os.SyscallError which technically was incorrect. If necessary, revert
// this behavior.
serr := err.(*netlink.OpError).Err
if diff := cmp.Diff("use of closed file", serr.Error()); diff != "" {
t.Fatalf("unexpected error from receive (-want +got):\n%s", diff)
}
}
func TestIntegrationConnConcurrentSerializeExecute(t *testing.T) {
t.Parallel()
skipShort(t)
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
t.Fatalf("failed to dial netlink: %v", err)
}
execN := func(n int) {
req := netlink.Message{
Header: netlink.Header{
Flags: netlink.Request | netlink.Acknowledge,
},
}
for i := 0; i < n; i++ {
// Execute will internally call Validate to ensure its
// request/response transaction is serialized appropriately, and
// any errors doing so will be reported here.
if _, err := c.Execute(req); err != nil {
panicf("failed to execute: %v", err)
}
}
}
const (
workers = 4
iterations = 2000
)
var wg sync.WaitGroup
wg.Add(workers)
defer wg.Wait()
for i := 0; i < workers; i++ {
go func() {
defer wg.Done()
execN(iterations)
}()
}
}
func TestIntegrationConnSetBuffersSyscallConn(t *testing.T) {
tests := []struct {
name string
check func(t *testing.T)
}{
// This test verifies both the force/non-force socket options depending
// on the caller's privileges.
{
name: "unprivileged",
check: skipPrivileged,
},
{
name: "privileged",
check: skipUnprivileged,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
tt.check(t)
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
t.Fatalf("failed to dial netlink: %v", err)
}
defer c.Close()
const (
set = 8192
// Per man 7 socket:
//
// "The kernel doubles this value (to allow space for
// bookâkeeping overhead) when it is set using setsockopt(2),
// and this doubled value is returned by getsockopt(2).""
want = set * 2
)
if err := c.SetReadBuffer(set); err != nil {
t.Fatalf("failed to set read buffer size: %v", err)
}
if err := c.SetWriteBuffer(set); err != nil {
t.Fatalf("failed to set write buffer size: %v", err)
}
// Now that we've set the buffers, we can check the size by asking the
// kernel using SyscallConn and getsockopt.
rc, err := c.SyscallConn()
if err != nil {
t.Fatalf("failed to get syscall conn: %v", err)
}
mustSize := func(opt int) int {
var (
value int
serr error
)
err := rc.Control(func(fd uintptr) {
value, serr = unix.GetsockoptInt(int(fd), unix.SOL_SOCKET, opt)
})
if err != nil {
t.Fatalf("failed to call control: %v", err)
}
if serr != nil {
t.Fatalf("failed to call getsockopt: %v", serr)
}
return value
}
if diff := cmp.Diff(want, mustSize(unix.SO_RCVBUF)); diff != "" {
t.Fatalf("unexpected read buffer size (-want +got):\n%s", diff)
}
if diff := cmp.Diff(want, mustSize(unix.SO_SNDBUF)); diff != "" {
t.Fatalf("unexpected write buffer size (-want +got):\n%s", diff)
}
})
}
}
func TestIntegrationConnSetBPFEmpty(t *testing.T) {
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
t.Fatalf("failed to dial netlink: %v", err)
}
defer c.Close()
if err := c.SetBPF(nil); err == nil {
t.Fatal("expected an error, but none occurred")
}
}
func TestIntegrationConnSetBPF(t *testing.T) {
t.Parallel()
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
t.Fatalf("failed to dial netlink: %v", err)
}
defer c.Close()
// The sequence number which will be permitted by the BPF filter.
// Using max uint32 helps us avoid dealing with host (netlink) vs
// network (BPF) endianness during this test.
const sequence uint32 = 0xffffffff
prog, err := bpf.Assemble(testBPFProgram(sequence))
if err != nil {
t.Fatalf("failed to assemble BPF program: %v", err)
}
if err := c.SetBPF(prog); err != nil {
t.Fatalf("failed to attach BPF program to socket: %v", err)
}
req := netlink.Message{
Header: netlink.Header{
Flags: netlink.Request | netlink.Acknowledge,
},
}
sequences := []struct {
seq uint32
ok bool
}{
// OK, bad, OK. Expect two messages to be received.
{seq: sequence, ok: true},
{seq: 10, ok: false},
{seq: sequence, ok: true},
}
for _, s := range sequences {
req.Header.Sequence = s.seq
if _, err := c.Send(req); err != nil {
t.Fatalf("failed to send with sequence %d: %v", s.seq, err)
}
if !s.ok {
continue
}
msgs, err := c.Receive()
if err != nil {
t.Fatalf("failed to receive with sequence %d: %v", s.seq, err)
}
// Make sure the received message has the expected sequence number.
if l := len(msgs); l != 1 {
t.Fatalf("unexpected number of messages: %d", l)
}
if want, got := s.seq, msgs[0].Header.Sequence; want != got {
t.Fatalf("unexpected reply sequence number:\n- want: %v\n- got: %v",
want, got)
}
}
if err := c.RemoveBPF(); err != nil {
t.Fatalf("failed to remove BPF filter: %v", err)
}
}
func Test_testBPFProgram(t *testing.T) {
// Verify the validity of our test BPF program.
vm, err := bpf.NewVM(testBPFProgram(0xffffffff))
if err != nil {
t.Fatalf("failed to create BPF VM: %v", err)
}
msg := []byte{
0x10, 0x00, 0x00, 0x00,
0x01, 0x00,
0x01, 0x00,
// Allowed sequence number.
0xff, 0xff, 0xff, 0xff,
0x01, 0x00, 0x00, 0x00,
}
out, err := vm.Run(msg)
if err != nil {
t.Fatalf("failed to execute OK input: %v", err)
}
if out == 0 {
t.Fatal("BPF filter dropped OK input")
}
msg = []byte{
0x10, 0x00, 0x00, 0x00,
0x01, 0x00,
0x01, 0x00,
// Bad sequence number.
0x00, 0x11, 0x22, 0x33,
0x01, 0x00, 0x00, 0x00,
}
out, err = vm.Run(msg)
if err != nil {
t.Fatalf("failed to execute bad input: %v", err)
}
if out != 0 {
t.Fatal("BPF filter did not drop bad input")
}
}
// testBPFProgram returns a BPF program which only allows frames with the
// input sequence number.
func testBPFProgram(allowSequence uint32) []bpf.Instruction {
return []bpf.Instruction{
bpf.LoadAbsolute{
Off: 8,
Size: 4,
},
bpf.JumpIf{
Cond: bpf.JumpEqual,
Val: allowSequence,
SkipTrue: 1,
},
bpf.RetConstant{
Val: 0,
},
bpf.RetConstant{
Val: 128,
},
}
}
func TestIntegrationConnExplicitPID(t *testing.T) {
t.Parallel()
// Compute a random uint32 PID and explicitly bind using it. We expect this
// PID will be used in messages that are sent to and received from the
// kernel.
rng := rand.New(rand.NewSource(time.Now().UnixNano()))
pid := rng.Uint32()
c, err := netlink.Dial(unix.NETLINK_GENERIC, &netlink.Config{PID: pid})
if err != nil {
t.Fatalf("failed to dial netlink: %v", err)
}
defer c.Close()
req := netlink.Message{
Header: netlink.Header{
Flags: netlink.Request | netlink.Acknowledge,
},
}
msg, err := c.Send(req)
if err != nil {
t.Fatalf("failed to send message: %v", err)
}
msgs, err := c.Receive()
if err != nil {
t.Fatalf("failed to receive messages: %v", err)
}
// Verify both the request and response messages contain the same PID.
for _, m := range append([]netlink.Message{msg}, msgs...) {
if diff := cmp.Diff(pid, m.Header.PID); diff != "" {
t.Fatalf("unexpected message PID (-want +got):\n%s", diff)
}
}
}
func TestIntegrationConnNetNSUnprivileged(t *testing.T) {
t.Parallel()
skipPrivileged(t)
// Created in CI build environment.
const ns = "unpriv0"
f, err := os.Open("/var/run/netns/" + ns)
if err != nil {
if os.IsNotExist(err) {
t.Skipf("skipping, expected %s namespace to exist", ns)
}
t.Fatalf("failed to open namespace file: %v", err)
}
defer f.Close()
_, err = netlink.Dial(unix.NETLINK_ROUTE, &netlink.Config{
NetNS: int(f.Fd()),
})
if !os.IsPermission(err) {
t.Fatalf("expected permission denied, but got: %v", err)
}
}
func TestIntegrationConnSendTimeout(t *testing.T) {
t.Parallel()
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
t.Fatalf("failed to dial: %v", err)
}
defer c.Close()
if err := c.SetWriteDeadline(time.Unix(0, 1)); err != nil {
t.Fatalf("failed to set deadline: %v", err)
}
_, err = c.Send(netlink.Message{
Header: netlink.Header{
Flags: netlink.Request | netlink.Acknowledge,
},
})
mustBeTimeoutNetError(t, err)
}
func TestIntegrationConnReceiveTimeout(t *testing.T) {
t.Parallel()
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
t.Fatalf("failed to dial: %v", err)
}
defer c.Close()
if err := c.SetReadDeadline(time.Unix(0, 1)); err != nil {
t.Fatalf("failed to set deadline: %v", err)
}
_, err = c.Receive()
mustBeTimeoutNetError(t, err)
}
func TestIntegrationConnExecuteTimeout(t *testing.T) {
t.Parallel()
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
t.Fatalf("failed to dial: %v", err)
}
defer c.Close()
if err := c.SetDeadline(time.Unix(0, 1)); err != nil {
t.Fatalf("failed to set deadline: %v", err)
}
req := netlink.Message{
Header: netlink.Header{
Flags: netlink.Request | netlink.Acknowledge,
},
}
_, err = c.Execute(req)
if err == nil {
t.Fatal("expected an error, but none occurred")
}
mustBeTimeoutNetError(t, err)
}
func TestOpErrorUnwrapLinux(t *testing.T) {
tests := []struct {
name string
err error
target error
ok bool
}{
{
name: "ENOBUFS",
err: unix.ENOBUFS,
target: os.ErrNotExist,
},
{
name: "OpError ENOBUFS",
err: &netlink.OpError{
Op: "receive",
Err: unix.ENOBUFS,
},
target: os.ErrNotExist,
},
{
name: "OpError os.SyscallError ENOBUFS",
err: &netlink.OpError{
Op: "receive",
Err: os.NewSyscallError("recvmsg", unix.ENOBUFS),
},
target: os.ErrNotExist,
},
{
name: "ENOENT",
err: unix.ENOENT,
target: os.ErrNotExist,
ok: true,
},
{
name: "OpError ENOENT",
err: &netlink.OpError{
Op: "receive",
Err: unix.ENOENT,
},
target: os.ErrNotExist,
ok: true,
},
{
name: "OpError os.SyscallError ENOENT",
err: &netlink.OpError{
Op: "receive",
Err: os.NewSyscallError("recvmsg", unix.ENOENT),
},
target: os.ErrNotExist,
ok: true,
},
{
name: "OpError os.SyscallError EEXIST",
err: &netlink.OpError{
Op: "receive",
Err: os.NewSyscallError("recvmsg", unix.EEXIST),
},
target: os.ErrExist,
ok: true,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got := errors.Is(tt.err, tt.target)
if diff := cmp.Diff(tt.ok, got); diff != "" {
t.Fatalf("unexpected result (-want +got):\n%s", diff)
}
})
}
}
func TestIntegrationConnClosedConn(t *testing.T) {
t.Parallel()
c, err := netlink.Dial(unix.NETLINK_GENERIC, nil)
if err != nil {
t.Fatalf("failed to dial netlink: %v", err)
}
// Close the connection immediately and ensure that future calls get EBADF.
if err := c.Close(); err != nil {
t.Fatalf("failed to close: %v", err)
}
tests := []struct {
name string
fn func() error
}{
{
name: "receive",
fn: func() error {
_, err := c.Receive()
return err
},
},
{
name: "send",
fn: func() error {
_, err := c.Send(netlink.Message{})
return err
},
},
{
name: "set option",
fn: func() error {
return c.SetOption(netlink.ExtendedAcknowledge, true)
},
},
{
name: "syscall conn",
fn: func() error {
_, err := c.SyscallConn()
return err
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if diff := cmp.Diff(unix.EBADF, tt.fn(), cmpopts.EquateErrors()); diff != "" {
t.Fatalf("unexpected error (-want +got):\n%s", diff)
}
})
}
}
func TestIntegrationConnStrict(t *testing.T) {
c, err := netlink.Dial(unix.NETLINK_GENERIC, &netlink.Config{Strict: true})
if err != nil {
if errors.Is(err, unix.ENOPROTOOPT) {
t.Skipf("skipping, strict options not supported by this kernel: %v", err)
}
t.Fatalf("failed to dial netlink: %v", err)
}
defer c.Close()
sc, err := c.SyscallConn()
if err != nil {
t.Fatalf("failed to open syscall conn: %v", err)
}
// Strict mode applies a series of socket options. Check each applied option
// and update the map to true if we found it set to true. Any options which
// were not applied as expected will result in the test failing.
opts := map[int]bool{
unix.NETLINK_EXT_ACK: false,
unix.NETLINK_GET_STRICT_CHK: false,
}
err = sc.Control(func(fd uintptr) {
for k := range opts {
// The kernel returns a non-zero value for true.
if v, err := unix.GetsockoptInt(int(fd), unix.SOL_NETLINK, k); err == nil && v != 0 {
opts[k] = true
}
}
})
if err != nil {
t.Fatalf("failed to call control: %v", err)
}
for k, v := range opts {
if !v {
t.Errorf("socket option %d was not set to true", k)
}
}
}
func mustBeTimeoutNetError(t *testing.T, err error) {
t.Helper()
nerr, ok := err.(net.Error)
if !ok {
t.Fatalf("expected net.Error, but got: %T", err)
}
if !nerr.Timeout() {
t.Fatalf("error did not indicate a timeout")
}
}
func skipPrivileged(t *testing.T) {
u, err := user.Current()
if err != nil {
t.Fatalf("failed to get user: %v", err)
}
if u.Uid == "0" {
t.Skip("skipping, test must be run as non-root user")
}
}
func skipUnprivileged(t *testing.T) {
const ifName = "nlprobe0"
shell(t, "ip", "tuntap", "add", ifName, "mode", "tun")
shell(t, "ip", "link", "del", ifName)
}
func skipShort(t *testing.T) {
t.Helper()
if testing.Short() {
t.Skip("skipping in short test mode")
}
}
func shell(t *testing.T, name string, arg ...string) {
t.Helper()
t.Logf("$ %s %v", name, arg)
cmd := exec.Command(name, arg...)
if err := cmd.Start(); err != nil {
t.Fatalf("failed to start command %q: %v", name, err)
}
if err := cmd.Wait(); err != nil {
// Shell operations in these tests require elevated privileges.
if cmd.ProcessState.ExitCode() == int(unix.EPERM) {
t.Skipf("skipping, permission denied: %v", err)
}
t.Fatalf("failed to wait for command %q: %v", name, err)
}
}
func panicf(format string, a ...interface{}) {
panic(fmt.Sprintf(format, a...))
}
|