wesher/wg/wireguard_test.go

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package wg
import (
"net"
"reflect"
"testing"
)
func Test_wgState_assignOverlayAddr(t *testing.T) {
type args struct {
ipnet *net.IPNet
name string
}
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_, ipv4net, _ := net.ParseCIDR("10.0.0.0/8")
_, ipv6net, _ := net.ParseCIDR("2001:db8::/32")
tests := []struct {
name string
args args
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want string
}{
{
"assign in big ipv4 net",
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args{ipv4net, "test"},
"10.221.153.165", // if we ever have to change this, we should probably also mark it as a breaking change
},
{
"assign in ipv6 net",
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args{ipv6net, "test"},
"2001:db8:c575:7277:b806:e994:13dd:99a5", // if we ever have to change this, we should probably also mark it as a breaking change
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
wg := &WgState{}
wg.AssignOverlayAddr(tt.args.ipnet, tt.args.name)
if !reflect.DeepEqual(wg.OverlayAddr.IP.String(), tt.want) {
t.Errorf("assignOverlayAddr() set = %s, want %s", wg.OverlayAddr, tt.want)
}
})
}
}
// This is just to ensure - if we ever change the hashing function - that it spreads the results in a way that at least
// avoids the most obvious collisions.
func Test_wgState_assignOverlayAddr_no_obvious_collisions(t *testing.T) {
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_, ipnet, _ := net.ParseCIDR("10.0.0.0/24")
assignments := make(map[string]string)
for _, n := range []string{"test", "test1", "test2", "1test", "2test"} {
wg := &WgState{}
wg.AssignOverlayAddr(ipnet, n)
if assigned, ok := assignments[wg.OverlayAddr.String()]; ok {
t.Errorf("IP assignment collision: hash(%s) = hash(%s)", n, assigned)
}
assignments[wg.OverlayAddr.String()] = n
}
}
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// This should ensure the obvious fact that the same name should map to the same IP if called twice.
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func Test_wgState_assignOverlayAddr_consistent(t *testing.T) {
_, ipnet, _ := net.ParseCIDR("10.0.0.0/8")
wg1 := &WgState{}
wg1.AssignOverlayAddr(ipnet, "test")
wg2 := &WgState{}
wg2.AssignOverlayAddr(ipnet, "test")
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if wg1.OverlayAddr.String() != wg2.OverlayAddr.String() {
t.Errorf("assignOverlayAddr() %s != %s", wg1.OverlayAddr, wg2.OverlayAddr)
}
}
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func Test_wgState_assignOverlayAddr_repeatable(t *testing.T) {
_, ipnet, _ := net.ParseCIDR("10.0.0.0/8")
wg := &WgState{}
wg.AssignOverlayAddr(ipnet, "test")
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gen1 := wg.OverlayAddr.String()
wg.AssignOverlayAddr(ipnet, "test")
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gen2 := wg.OverlayAddr.String()
if gen1 != gen2 {
t.Errorf("assignOverlayAddr() %s != %s", gen1, gen2)
}
}