iproute_test.go

package iproute

import (
	"bytes"
	"fmt"
	//netns "github.com/hariguchi/go_netns"
	"io/ioutil"
	"net"
	"os"
	"os/exec"
	"regexp"
	"runtime"
	"sort"
	"testing"
)

func testVrfAdd(t *testing.T) *Vrf {
	var vrfName string
	var tid uint32 = 1
	for {
		vrfName = fmt.Sprintf("myVRF%02d", tid)
		if _, err := VrfGetByName(vrfName); err == nil {
			t.Logf("VRF %s already exists.", vrfName)
			tid++
		} else {
			break
		}
	}
	t.Logf("Adding VRF %s (tid %d)... ", vrfName, tid)
	if vrf, err := VrfAdd(vrfName, tid, Down); err == nil {
		if vrf.Name() == vrfName && vrf.Tid() == tid {
			t.Logf("confirmed.")
			return vrf
		} else {
			t.Fatalf("Error: VRF %s (tid %d)", vrf.Name(), vrf.Tid())
		}
	} else {
		t.Fatalf("Error: failed to add.")
	}
	return nil
}

func testVrfDelete(t *testing.T, vrf *Vrf) {
	t.Logf("Deleting VRF %s... ", vrf.Name())

	if _, err := VrfGetByName(vrf.Name()); err == nil {
		if err := VrfDelete(vrf.Name()); err == nil {
			t.Logf("deleted... ")
			if _, err := VrfGetByName(vrf.Name()); err != nil {
				t.Logf("confirmed.")
			} else {
				t.Fatalf("Error: VRF %s still exists.", vrf.Name())
			}
		} else {
			t.Fatalf("Error: failed to delete VRF %s", vrf.Name())
		}
	} else {
		t.Fatalf("Error: no such VRF: %s", vrf.Name())
	}
}

func testVethAdd(t *testing.T) *Veth {
	var (
		vethName string
		peerName string
		i        int
	)

	for i = 0; true; i++ {
		vethName = fmt.Sprintf("foo%02d-bar%02d", i, i)
		peerName = fmt.Sprintf("bar%02d-foo%02d", i, i)
		if veth, err := VethGetByName(vethName); err == nil {
			if vethName != veth.Name() {
				t.Fatalf("%s, %s", vethName, veth.Name())
			}
			if peerName != veth.PeerName() {
				t.Fatalf("%s, %s", peerName, veth.PeerName())
			}
			t.Logf("veth pair %s - %s already exists.",
				veth.Name(), veth.PeerName())
			if err := VethDelete(vethName); err != nil {
				t.Fatal(err)
			}
		} else if IsNotFound(err) {
			break
		} else {
			t.Fatal(err)
		}
	}

	t.Logf("Adding veth pair: %s - %s...", vethName, peerName)
	if veth, err := VethAdd(vethName, peerName, false); err == nil {
		if veth.Name() != vethName {
			t.Fatalf("%s: %s", veth.Name(), vethName)
		}
		if veth.PeerName() != peerName {
			t.Fatalf("%s: %s", veth.PeerName(), peerName)
		}
		if peer, err := VethGetByName(peerName); err == nil {
			if peer.Name() == peerName && peer.PeerName() == vethName {
				if peer.TxQlen() != DefaultTxQlen {
					t.Logf("  TxQlen: %d - %d\n", DefaultTxQlen, peer.TxQlen())
				}
				if peer.MTU() != DefaultMTU {
					t.Logf("  MTU: %d - %d\n", DefaultMTU, peer.MTU())
				}
				t.Logf("confirmed.")
				return veth
			} else {
				t.Fatalf("in: %s - %s, out: %s - %s",
					vethName, peerName, peer.PeerName(), peer.Name())
			}
		} else {
			t.Fatalf("VethGetByName(%s): %v", peerName, err)
		}
	} else {
		t.Fatalf("VethAdd(%s, %s): %v", vethName, peerName, err)
	}
	return nil
}

func testVethDelete(t *testing.T, veth *Veth) {
	t.Logf("Deleting veth pair %s - %s... ", veth.Name(), veth.PeerName())

	if _, err := VethGetByName(veth.PeerName()); err == nil {
		if err := VethDelete(veth.PeerName()); err == nil {
			t.Logf("confirmed.")
		} else {
			t.Fatalf("Error: VethDelete(%s): %v", veth.PeerName(), err)
		}
	} else {
		t.Fatalf("VethGetByName(%s): no such veth exists.", veth.PeerName())
	}
}

func testVlanDelete(t *testing.T, vlan string) {
	t.Logf("Deleting VLAN %s... ", vlan)
	if err := VlanDelete(vlan); err == nil {
		t.Logf("confirmed.")
	} else {
		t.Errorf("Error: VlanDelete(%s): %v", vlan, err)
	}
}

func testIpAddrAdd(t *testing.T, veth *Veth, vlanId uint16, ifa []string) {
	names := []string{
		fmt.Sprintf("%s.%d", veth.Name(), vlanId),
		fmt.Sprintf("%s.%d", veth.PeerName(), vlanId),
	}
	for i, name := range names {
		t.Logf("Adding %s to %s", ifa[i], name)
		if addr, net, err := net.ParseCIDR(ifa[i]); err == nil {
			net.IP = addr
			if err := IpAddrAdd(name, net, true); err == nil {
				if ok, err := IsIfPrefix(name, net); err == nil {
					if !ok {
						t.Errorf("Error: failed to %s to %s", ifa[i], name)
					}
				} else {
					t.Errorf("Error: IsIfPrefix(%s, %s): %v", name, ifa[i], err)
				}
			} else {
				t.Errorf("Error: IpAddrAdd(%s, %s): %v", name, ifa[i], err)
			}
		} else {
			t.Errorf("Error: ParseCIDR(%s): %v", ifa[i], err)
		}
	}
}

func testRename(t *testing.T, vrf *Vrf, name string) {
	errMsg := fmt.Sprintf("Error: IfRename(%s, %s): ", vrf.Name(), name)
	t.Logf("Renaming %s to %s...", vrf.Name(), name)
	if err := IfRename(vrf.Name(), name); err == nil {
		if v, err := VrfGetByName(name); err == nil {
			if v.Name() == name && v.Tid() == vrf.Tid() {
				t.Logf("confirmed.")
			} else {
				t.Errorf(errMsg+
					"name: %s (should be %s), Tid: %d (should be %d), %v",
					v.Name(), name, v.Tid(), vrf.Tid(), err)
			}
		} else {
			t.Errorf(errMsg+"VrfGetByName(%s): %v", name, err)
		}
	} else {
		t.Errorf(errMsg+"%v", err)
	}
}

func vrfVethVlanAdd(t *testing.T, vlanId uint16) (*Vrf, *Veth) {
	var vlanIfs []string

	// 1. Create a vrf
	// 2. Make sure it is down
	// 3. Bring it up
	// 4. Make sure it is up
	//
	vrf := testVrfAdd(t)
	if vrf == nil {
		t.Fatal("Failed to create a VRF")
	}
	if r, err := IfIsUpByName(vrf.Name()); err == nil {
		if r == true {
			t.Errorf("Error: VRF %s should be DOWN", vrf.Name())
		}
		if err := IfUpByName(vrf.Name()); err != nil {
			t.Errorf("Error: Failed to bring up %s", vrf.Name())
		}
	} else {
		t.Errorf("Error: IfIsUpByName(%s): %v", vrf.Name(), err)
	}

	// 1. Add veth pair
	// 2. Make sure both veth interfaces are down
	// 3. Bring them up
	//
	veth := testVethAdd(t)
	for _, name := range []string{veth.Name(), veth.PeerName()} {
		if ok, err := IfIsUpByName(name); err == nil {
			if ok {
				t.Errorf("Error: %s should be down", name)
			}
			t.Logf("Bringing up %s...", name)
			if err := IfUpByName(name); err == nil {
				if ok, err := IfIsUpByName(name); err == nil {
					if ok {
						t.Logf("confirmed.")
					} else {
						t.Errorf("Error: %s should be up.", name)
					}
				}
			} else {
				t.Errorf("Error: IfUpByName(%s): %v", name, err)
			}
		} else {
			t.Errorf("Error: IfIsUpByName(%s): %v", name, err)
		}
	}

	// 1. Add VLAN interfaces to veth interface pair
	// 2. Make sure they are down
	// 3. Bring them up
	//
	if vlan, err := VlanAdd(veth.Name(), vlanId); err == nil {
		exp := fmt.Sprintf("%s.%d", veth.Name(), vlanId)
		if vlan.Name() == exp {
			vlanIfs = append(vlanIfs, vlan.Name())
			if ok, err := IfIsUpByName(vlan.Name()); err == nil {
				if ok {
					t.Errorf("Error: %s should be down", vlan.Name())
				}
			} else {
				t.Errorf("Error: IfIsUpByName(%s): %v", vlan.Name(), err)
			}
		} else {
			t.Errorf("Error: %s: should be %s", vlan.Name(), exp)
		}
	} else {
		t.Errorf("Error: VlanAdd(%d, %s): %v", vlanId, veth.Name(), err)
	}
	if vlan, err := VlanAdd(veth.PeerName(), vlanId); err == nil {
		exp := fmt.Sprintf("%s.%d", veth.PeerName(), vlanId)
		if vlan.Name() == exp {
			vlanIfs = append(vlanIfs, vlan.Name())
			if ok, err := IfIsUpByName(vlan.Name()); err == nil {
				if ok {
					t.Errorf("Error: %s should be down", vlan.Name())
				}
			} else {
				t.Errorf("Error: IfIsUpByName(%s): %v", vlan.Name(), err)
			}
		} else {
			t.Errorf("Error: %s: should be %s", vlan.Name(), exp)
		}
	} else {
		t.Errorf("Error: VlanAdd(%d, %s): %v", vlanId, veth.PeerName(), err)
	}

	for _, name := range vlanIfs {
		if err := VrfBindIf(vrf.Name(), name); err == nil {
			if err := IfUpByName(name); err == nil {
				if ok, err := IfIsUpByName(name); err == nil {
					if !ok {
						t.Errorf("Error: %s should be up", name)
					}
				} else {
					t.Errorf("Error: IfIsUpByName(%s): %v", name, err)
				}
			} else {
				t.Errorf("Error: IfUpByName(%s): %v", name, err)
			}
		} else {
			t.Errorf("Error: VrfBindIf(%s, %s): %v", vrf.Name(), name, err)
		}
	}
	return vrf, veth
}

func testPing(t *testing.T, vrf *Vrf, ifPrefix []string) {
	var (
		ifAddr  []string
		pingMsg = regexp.MustCompile(`0% packet loss`)
	)

	for _, prefix := range ifPrefix {
		if ipa, _, err := net.ParseCIDR(prefix); err == nil {
			ifAddr = append(ifAddr, ipa.String())
		} else {
			t.Errorf("Error: testPing(): ParseCIDR(%s): %v", prefix, err)
			return
		}
	}
	if fp, err := ioutil.TempFile("", "vrfping"); err == nil {
		defer os.Remove(fp.Name())

		cmd := fmt.Sprintf("#!/bin/sh\nVRF=%s ", vrf.Name())
		cmd += "LD_PRELOAD=/usr/bin/vrf_socket.so "
		cmd += fmt.Sprintf("ping -f -q -c 5 -I %s %s\n", ifAddr[0], ifAddr[1])
		if _, err := fp.WriteString(cmd); err == nil {
			name := fp.Name()
			if err := fp.Close(); err == nil {
				if err := os.Chmod(name, 0755); err == nil {
					t.Logf("Ping test:\n%s\n...", cmd)
					if out, err := exec.Command(name).Output(); err == nil {
						if pingMsg.MatchString(string(out)) {
							t.Logf("confirmed.")
						} else {
							t.Errorf("Error: testPing():\n%s\n", string(out))
						}
					} else {
						t.Errorf("testPing(): Command(%s): %v", name, err)
						t.Fatalf("testPing(): Output: %s", string(out))
					}
				} else {
					t.Errorf("testPing(): Chmod(): %v", err)
				}
			} else {
				t.Errorf("testPing(): Close(): %v", err)
			}
		} else {
			t.Errorf("testPing(): WriteString(%s): %v", cmd, err)
		}
	} else {
		t.Errorf("testPing(): Tempfile(): %v", err)
	}
}

func testRoutes(t *testing.T, vrf *Vrf, dstName, nhName string) {
	errMsg := fmt.Sprintf("Error: testRoutes(): ")
	var rt *Route
	if _, dst, err := net.ParseCIDR(dstName); err == nil {
		nha := net.ParseIP(nhName)
		nh := IPs{nha}
		if r, err := NewRoute(dst, nh); err == nil {
			rt = &r
			t.Logf("Addring route: %s nh %s", dst, nhName)
			if err := VrfAddRouteByName(vrf.Name(), rt); err != nil {
				t.Errorf(errMsg+
					"VrfAddRouteByName(%s, %v): %v", vrf.Name(), rt, err)
				return
			}
		} else {
			t.Errorf(errMsg+"NewRoute(%v, %v): %v", dst, nh, err)
			return
		}
		//
		// verify rt is in the Kernel FIB
		//
		t.Logf("rt: %v", rt)
		if routes, err := VrfGetIPv4routesByName(vrf.Name()); err == nil {
			t.Logf(" all routes:\n%v", routes)
			err = fmt.Errorf(errMsg+"%s nh %s: not exists", dst, nhName)
			for _, r := range routes {
				if IPNetEqual(r.Dst, rt.Dst) && r.Gw != nil && r.Gw.Equal(nha) {
					t.Logf("confirmed.")
					err = nil
					break
				}
			}
			if err != nil {
				t.Error(err)
				return
			}
		}
	} else {
		t.Errorf(errMsg+"ParseCIDR(): %v", err)
		return
	}
}

func testIPsortFail(t *testing.T, nh IPs) {
	defer func() {
		if r := recover(); r != nil {
			t.Logf("recovered: %v", r)
		}
	}()
	t.Logf("%v", nh)
	sort.Sort(nh)
	t.Logf("%v", nh)
}

func TestIPsortFailure(t *testing.T) {
	t.Logf("Testing IP address sorting failure...")
	var nh IPs
	nh = append(nh, net.ParseIP("2001::1"))
	nh = append(nh, net.ParseIP("4.3.2.1").To4())
	testIPsortFail(t, nh)
}

func TestIPsort(t *testing.T) {
	t.Logf("Testing IPv4 address sorting...")
	var nh IPs
	nh = append(nh, net.ParseIP("4.3.2.1"))
	nh = append(nh, net.ParseIP("1.2.3.4"))
	nh = append(nh, net.ParseIP("2.3.4.1"))
	nh = append(nh, net.ParseIP("1.3.2.4"))
	nh = append(nh, net.ParseIP("1.2.3.4"))
	t.Logf("%v", nh)
	sort.Sort(nh)
	for i := 0; i < len(nh)-1; i++ {
		if bytes.Compare(nh[i], nh[i+1]) > 0 {
			t.Errorf("TestIPsort(): %v", nh)
			return
		}
	}
	t.Logf("%v\nconfirmed.", nh)
}

func TestVrf(t *testing.T) {
	var vlanId uint16 = 100
	var newVrfName = "vrf01"
	var err error
	ifAddrs := []string{"172.16.1.1/24", "172.16.1.2/24"}

	vrf, veth := vrfVethVlanAdd(t, uint16(vlanId))
	testRename(t, vrf, newVrfName)
	if vrf == nil {
		t.Fatal("Frailed to rename a VRF")
	}
	//
	// need to upate `vrf' since its name was changed
	//
	if vrf, err = VrfGetByName(newVrfName); err != nil {
		t.Fatal(err)
	}
	testIpAddrAdd(t, veth, vlanId, ifAddrs)
	vifName := fmt.Sprintf("%s.%d", veth.Name(), vlanId)
	testPing(t, vrf, ifAddrs)
	testRoutes(t, vrf, "192.168.1.0/24", "172.16.1.3")

	testVlanDelete(t, vifName)
	testVrfDelete(t, vrf)
	testVethDelete(t, veth)
}

func TestSetOnlink(t *testing.T) {
	nhi := NHinfo{}
	if err := SetOnlink(&nhi); err != nil {
		t.Fatal(err)
	}
}

func TestBridge(t *testing.T) {
	var (
		veth [2]*Veth
		vrf  [2]*Vrf
	)
	brName := "brTest1"
	vethPair := [2][2]string{
		{"br-vrf1", "vrf1-br"},
		{"br-vrf2", "vrf2-br"},
	}

	br, err := BridgeGetByName(brName)
	if err == nil {
		t.Logf("bridge %s already exists. Deletes it", br.Name())
		err = BridgeDelete(brName)
		if err != nil {
			t.Fatal(err)
		}
	} else if !IsNotFound(err) {
		t.Fatal(err)
	}
	br, err = BridgeAdd(brName, Up)
	if err != nil {
		t.Fatal(err)
	}
	if err := br.IfUp(); err != nil {
		t.Fatal(err)
	}
	for i := 0; i < len(veth); i++ {
		veth[i], err = VethGetByName(vethPair[i][0])
		if veth[i] == nil {
			veth[i], err = VethAdd(vethPair[i][0], vethPair[i][1], Up)
			if err != nil {
				t.Fatal(err)
			}
		} else if err == nil {
			t.Logf("veth pair (%s, %s) already exists",
				veth[i].Name(), veth[i].PeerName())
		} else {
			t.Fatal(err)
		}
		vrfName := fmt.Sprintf("vrf%d", i+1)
		vrf[i], _ = VrfGetByName(vrfName)
		if vrf[i] == nil {
			vrf[i], err = VrfAdd(vrfName, uint32(i+1), Up)
			if err != nil {
				t.Fatal(err)
			}
		} else if err == nil {
			t.Logf("VRF %s already exists", vrf[i].Name())
		} else {
			t.Fatal(err)
		}
	}
	for i := 0; i < len(vethPair); i++ {
		err = br.BindIf(vethPair[i][1])
		if err != nil {
			t.Fatal(err)
		}
	}
	for i := 0; i < len(vethPair); i++ {
		err = IfUnbind(vethPair[i][0])
		if err != nil {
			t.Errorf("%s: %v", vethPair[i][0], err)
		}
		err = VethDelete(vethPair[i][0])
		if err != nil {
			t.Errorf("%s: %v", vethPair[i][0], err)
		}
	}
	for i := 0; i < len(vrf); i++ {
		err = VrfDelete(vrf[i].Name())
		if err != nil {
			t.Errorf("%s: %v", vrf[i].Name(), err)
		}
	}
	err = BridgeDelete(brName)
	if err != nil {
		t.Fatal(err)
	}
}

func TestVethSetNS(t *testing.T) {
	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

}