diff options
Diffstat (limited to 'test/packetimpact/testbench/rawsockets.go')
-rw-r--r-- | test/packetimpact/testbench/rawsockets.go | 180 |
1 files changed, 0 insertions, 180 deletions
diff --git a/test/packetimpact/testbench/rawsockets.go b/test/packetimpact/testbench/rawsockets.go deleted file mode 100644 index 09bfa43c5..000000000 --- a/test/packetimpact/testbench/rawsockets.go +++ /dev/null @@ -1,180 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// 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. - -package testbench - -import ( - "encoding/binary" - "flag" - "math" - "net" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/usermem" -) - -var device = flag.String("device", "", "local device for test packets") - -// Sniffer can sniff raw packets on the wire. -type Sniffer struct { - t *testing.T - fd int -} - -func htons(x uint16) uint16 { - buf := [2]byte{} - binary.BigEndian.PutUint16(buf[:], x) - return usermem.ByteOrder.Uint16(buf[:]) -} - -// NewSniffer creates a Sniffer connected to *device. -func NewSniffer(t *testing.T) (Sniffer, error) { - flag.Parse() - snifferFd, err := unix.Socket(unix.AF_PACKET, unix.SOCK_RAW, int(htons(unix.ETH_P_ALL))) - if err != nil { - return Sniffer{}, err - } - if err := unix.SetsockoptInt(snifferFd, unix.SOL_SOCKET, unix.SO_RCVBUFFORCE, 1); err != nil { - t.Fatalf("can't set sockopt SO_RCVBUFFORCE to 1: %s", err) - } - if err := unix.SetsockoptInt(snifferFd, unix.SOL_SOCKET, unix.SO_RCVBUF, 1e7); err != nil { - t.Fatalf("can't setsockopt SO_RCVBUF to 10M: %s", err) - } - return Sniffer{ - t: t, - fd: snifferFd, - }, nil -} - -// maxReadSize should be large enough for the maximum frame size in bytes. If a -// packet too large for the buffer arrives, the test will get a fatal error. -const maxReadSize int = 65536 - -// Recv tries to read one frame until the timeout is up. -func (s *Sniffer) Recv(timeout time.Duration) []byte { - deadline := time.Now().Add(timeout) - for { - timeout = deadline.Sub(time.Now()) - if timeout <= 0 { - return nil - } - whole, frac := math.Modf(timeout.Seconds()) - tv := unix.Timeval{ - Sec: int64(whole), - Usec: int64(frac * float64(time.Microsecond/time.Second)), - } - - if err := unix.SetsockoptTimeval(s.fd, unix.SOL_SOCKET, unix.SO_RCVTIMEO, &tv); err != nil { - s.t.Fatalf("can't setsockopt SO_RCVTIMEO: %s", err) - } - - buf := make([]byte, maxReadSize) - nread, _, err := unix.Recvfrom(s.fd, buf, unix.MSG_TRUNC) - if err == unix.EINTR || err == unix.EAGAIN { - // There was a timeout. - continue - } - if err != nil { - s.t.Fatalf("can't read: %s", err) - } - if nread > maxReadSize { - s.t.Fatalf("received a truncated frame of %d bytes", nread) - } - return buf[:nread] - } -} - -// Drain drains the Sniffer's socket receive buffer by receiving until there's -// nothing else to receive. -func (s *Sniffer) Drain() { - s.t.Helper() - flags, err := unix.FcntlInt(uintptr(s.fd), unix.F_GETFL, 0) - if err != nil { - s.t.Fatalf("failed to get sniffer socket fd flags: %s", err) - } - if _, err := unix.FcntlInt(uintptr(s.fd), unix.F_SETFL, flags|unix.O_NONBLOCK); err != nil { - s.t.Fatalf("failed to make sniffer socket non-blocking: %s", err) - } - for { - buf := make([]byte, maxReadSize) - _, _, err := unix.Recvfrom(s.fd, buf, unix.MSG_TRUNC) - if err == unix.EINTR || err == unix.EAGAIN || err == unix.EWOULDBLOCK { - break - } - } - if _, err := unix.FcntlInt(uintptr(s.fd), unix.F_SETFL, flags); err != nil { - s.t.Fatalf("failed to restore sniffer socket fd flags: %s", err) - } -} - -// Close the socket that Sniffer is using. -func (s *Sniffer) Close() { - if err := unix.Close(s.fd); err != nil { - s.t.Fatalf("can't close sniffer socket: %s", err) - } - s.fd = -1 -} - -// Injector can inject raw frames. -type Injector struct { - t *testing.T - fd int -} - -// NewInjector creates a new injector on *device. -func NewInjector(t *testing.T) (Injector, error) { - flag.Parse() - ifInfo, err := net.InterfaceByName(*device) - if err != nil { - return Injector{}, err - } - - var haddr [8]byte - copy(haddr[:], ifInfo.HardwareAddr) - sa := unix.SockaddrLinklayer{ - Protocol: unix.ETH_P_IP, - Ifindex: ifInfo.Index, - Halen: uint8(len(ifInfo.HardwareAddr)), - Addr: haddr, - } - - injectFd, err := unix.Socket(unix.AF_PACKET, unix.SOCK_RAW, int(htons(unix.ETH_P_ALL))) - if err != nil { - return Injector{}, err - } - if err := unix.Bind(injectFd, &sa); err != nil { - return Injector{}, err - } - return Injector{ - t: t, - fd: injectFd, - }, nil -} - -// Send a raw frame. -func (i *Injector) Send(b []byte) { - if _, err := unix.Write(i.fd, b); err != nil { - i.t.Fatalf("can't write: %s", err) - } -} - -// Close the underlying socket. -func (i *Injector) Close() { - if err := unix.Close(i.fd); err != nil { - i.t.Fatalf("can't close sniffer socket: %s", err) - } - i.fd = -1 -} |