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Change unicast connection of dhcpv4 client as a raw socket
If the network manager in the operating system uses DHCP to obtain an IP for the network card, it will occupy the DHCP client port. In this case the release function will fail because the unicast connection with UDP socket needs the same port. Use a raw udp socket instead of a datagram udp socket to solve it. Signed-off-by: yaocw2020 <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| package nclient4 | ||
|
|
||
| import ( | ||
| "net" | ||
| "testing" | ||
|
|
||
| "github.com/vishvananda/netlink" | ||
| ) | ||
|
|
||
| const ( | ||
| linkName = "neigh0" | ||
| ipStr = "10.99.0.1" | ||
| macStr = "aa:bb:cc:dd:00:01" | ||
| ) | ||
|
|
||
| func TestGetHwAddrFromLocalCache(t *testing.T) { | ||
| mac, err := net.ParseMAC(macStr) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| ip := net.ParseIP(ipStr) | ||
|
|
||
| if err := addNeigh(ip, mac); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| defer func() { | ||
| if err := delNeigh(ip, mac); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| }() | ||
|
|
||
| ifc, err := net.InterfaceByName(linkName) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| if hw, err := getHwAddr(ifc, ip); err != nil && hw != nil && hw.String() == macStr { | ||
| t.Fatal(err) | ||
| } | ||
| } | ||
|
|
||
| func TestGetHwAddrOfLoopback(t *testing.T) { | ||
| lo, err := net.InterfaceByName("lo") | ||
| if err != nil { | ||
| t.Fatalf("get the loopback interface failed, err: %s", err.Error()) | ||
| } | ||
| if _, err := getHwAddr(lo, net.ParseIP("127.0.0.1")); err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| } | ||
|
|
||
| func addNeigh(ip net.IP, mac net.HardwareAddr) error { | ||
| dummy := netlink.Dummy{LinkAttrs: netlink.LinkAttrs{Name: linkName}} | ||
| if err := netlink.LinkAdd(&dummy); err != nil { | ||
| return err | ||
| } | ||
| newlink, err := netlink.LinkByName(dummy.Name) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| dummy.Index = newlink.Attrs().Index | ||
|
|
||
| return netlink.NeighAdd(&netlink.Neigh{ | ||
| LinkIndex: dummy.Index, | ||
| State: netlink.NUD_REACHABLE, | ||
| IP: ip, | ||
| HardwareAddr: mac, | ||
| }) | ||
| } | ||
|
|
||
| func delNeigh(ip net.IP, mac net.HardwareAddr) error { | ||
| dummy, err := netlink.LinkByName(linkName) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return netlink.NeighDel(&netlink.Neigh{ | ||
| LinkIndex: dummy.Attrs().Index, | ||
| State: netlink.NUD_REACHABLE, | ||
| IP: ip, | ||
| HardwareAddr: mac, | ||
| }) | ||
| } | ||
|
|
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