Files
netbird/client/system/network_addr_test.go
Zoltan Papp fd96b8c12f [client] Improve network addresses filter (#6515)
* [client] Filter link-local and multicast from network addresses

Skip IPv6 link-local and multicast addresses when building the peer
network_addresses list on non-iOS platforms, matching the existing iOS
behavior. A flapping NIC's link-local address otherwise churns the peer
meta on every interface up/down.

* [client] Skip engine restart when default route is unchanged

After the network monitor's debounce window, re-check the default next
hop before triggering a client restart. A flapping NIC that returns to
the same default route no longer forces a restart, avoiding redundant
sync stream reconnects and peer meta churn.

* [client] Exclude own overlay address from reported network addresses

The peer's own WireGuard overlay address (v4 and v6) was reported in
network_addresses. As the interface comes and goes during reconnects it
churned the peer meta on the management server. Drop it in
GetInfoWithChecks, matching the IP regardless of prefix length since the
engine knows the overlay address with the network mask while the
interface reports it as a host address.

* [client] Treat missing default route per protocol in next-hop check

A failed GetNextHop lookup is now treated as an absent route (zero
Nexthop) and compared per protocol, instead of forcing a restart. In a
single-stack network the missing IPv6 default route no longer counts as
a change on every debounce, which previously defeated the unchanged-route
check.

* [client] Make next-hop check injectable for network monitor tests

Move the next-hop comparison behind a NetworkMonitor field set by New(),
so tests can supply a stub instead of hitting the host's real default
route. Fixes the Event/MultiEvent tests hanging after the unchanged-route
check was added.

* Revert "[client] Make next-hop check injectable for network monitor tests"

This reverts commit 88a9d96e8f.

* Revert "[client] Treat missing default route per protocol in next-hop check"

This reverts commit 0fb531e4bc.

* Revert "[client] Skip engine restart when default route is unchanged"

This reverts commit a071b55f35.
2026-06-28 12:44:40 +02:00

46 lines
998 B
Go

//go:build !ios
package system
import (
"net"
"testing"
)
func mustIPNet(t *testing.T, cidr string) *net.IPNet {
t.Helper()
ip, ipNet, err := net.ParseCIDR(cidr)
if err != nil {
t.Fatalf("parse %q: %v", cidr, err)
}
ipNet.IP = ip
return ipNet
}
func TestToNetworkAddress_Filtering(t *testing.T) {
const mac = "c8:4b:d6:b6:04:ac"
tests := []struct {
name string
cidr string
want bool
}{
{"ipv4 global", "10.65.16.181/23", true},
{"ipv6 global", "2620:52:0:4110:102d:6a98:ee75:8b92/64", true},
{"ipv4 loopback", "127.0.0.1/8", false},
{"ipv6 loopback", "::1/128", false},
{"ipv6 link-local", "fe80::871:4c25:23d7:2529/64", false},
{"ipv4 link-local", "169.254.1.2/16", false},
{"ipv6 multicast", "ff02::1/128", false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
_, got := toNetworkAddress(mustIPNet(t, tt.cidr), mac)
if got != tt.want {
t.Errorf("toNetworkAddress(%s) ok = %v, want %v", tt.cidr, got, tt.want)
}
})
}
}