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netconfig: implement spoof_hardware_addr for easier testing

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This commit is contained in:
Michael Stapelberg 2018-06-04 08:30:57 +02:00
parent 2ef8bf6ea0
commit 1b004597c1
2 changed files with 26 additions and 3 deletions
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9
integrationnetconfig_test.go
View File

@ -22,6 +22,7 @@ const goldenInterfaces = `
},
{
"hardware_addr": "02:73:53:00:b0:0c",
"spoof_hardware_addr": "02:73:53:00:b0:aa",
"name": "lan0",
"addr": "192.168.42.1/24"
}
@ -124,6 +125,14 @@ func TestNetconfig(t *testing.T) {
t.Fatal(err)
}
link, err := exec.Command("ip", "netns", "exec", ns, "ip", "link", "show", "dev", "lan0").Output()
if err != nil {
t.Fatal(err)
}
if !strings.Contains(string(link), "link/ether 02:73:53:00:b0:aa") {
t.Errorf("lan0 MAC address is not 02:73:53:00:b0:aa")
}
addrs, err := exec.Command("ip", "netns", "exec", ns, "ip", "address", "show", "dev", "uplink0").Output()
if err != nil {
t.Fatal(err)

14
internal/netconfig/netconfig.go
View File

@ -148,6 +148,7 @@ func applyDhcp6(dir string) error {
type InterfaceDetails struct {
HardwareAddr string `json:"hardware_addr"` // e.g. dc:9b:9c:ee:72:fd
SpoofHardwareAddr string `json:"spoof_hardware_addr"` // e.g. dc:9b:9c:ee:72:fd
Name string `json:"name"` // e.g. uplink0, or lan0
Addr string `json:"addr"` // e.g. 192.168.42.1/24
}
@ -190,6 +191,9 @@ func applyInterfaces(dir, root string) error {
byHardwareAddr := make(map[string]InterfaceDetails)
for _, details := range cfg.Interfaces {
byHardwareAddr[details.HardwareAddr] = details
if spoof := details.SpoofHardwareAddr; spoof != "" {
byHardwareAddr[spoof] = details
}
}
links, err := netlink.LinkList()
for _, l := range links {
@ -214,6 +218,16 @@ func applyInterfaces(dir, root string) error {
attr.Name = details.Name
}
if spoof := details.SpoofHardwareAddr; spoof != "" {
hwaddr, err := net.ParseMAC(spoof)
if err != nil {
return fmt.Errorf("ParseMAC(%q): %v", spoof, err)
}
if err := netlink.LinkSetHardwareAddr(l, hwaddr); err != nil {
return fmt.Errorf("LinkSetHardwareAddr(%v): %v", hwaddr, err)
}
}
if attr.OperState != netlink.OperUp {
// Set the interface to up, which is required by all other configuration.
if err := netlink.LinkSetUp(l); err != nil {