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net/interfaces: reconcile interface filtering with address printing in logs

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The interface.State logging tried to only log interfaces which had
interesting IPs, but the what-is-interesting checks differed between
the code that gathered the interface names to print and the printing
of their addresses.
This commit is contained in:
Brad Fitzpatrick 2021-02-12 18:38:16 -08:00
parent c7e5ab8094
commit 20e66c5b92
1 changed files with 18 additions and 10 deletions
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28
net/interfaces/interfaces.go
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@ -197,10 +197,9 @@ func (s *State) String() string {
fmt.Fprintf(&sb, "interfaces.State{defaultRoute=%v ifs={", s.DefaultRouteInterface) fmt.Fprintf(&sb, "interfaces.State{defaultRoute=%v ifs={", s.DefaultRouteInterface)
ifs := make([]string, 0, len(s.InterfaceUp)) ifs := make([]string, 0, len(s.InterfaceUp))
for k := range s.InterfaceUp { for k := range s.InterfaceUp {
if allLoopbackIPs(s.InterfaceIPs[k]) { if anyInterestingIP(s.InterfaceIPs[k]) {
continue ifs = append(ifs, k)
} }
ifs = append(ifs, k)
} }
sort.Slice(ifs, func(i, j int) bool { sort.Slice(ifs, func(i, j int) bool {
upi, upj := s.InterfaceUp[ifs[i]], s.InterfaceUp[ifs[j]] upi, upj := s.InterfaceUp[ifs[i]], s.InterfaceUp[ifs[j]]
@ -218,7 +217,7 @@ func (s *State) String() string {
fmt.Fprintf(&sb, "%s:[", ifName) fmt.Fprintf(&sb, "%s:[", ifName)
needSpace := false needSpace := false
for _, ip := range s.InterfaceIPs[ifName] { for _, ip := range s.InterfaceIPs[ifName] {
if ip.IsLinkLocalUnicast() { if !isInterestingIP(ip) {
continue continue
} }
if needSpace { if needSpace {
@ -403,14 +402,23 @@ var (
v6Global1 = mustCIDR("2000::/3") v6Global1 = mustCIDR("2000::/3")
) )
func allLoopbackIPs(ips []netaddr.IP) bool { // anyInterestingIP reports ips contains any IP that matches
if len(ips) == 0 { // isInterestingIP.
return false func anyInterestingIP(ips []netaddr.IP) bool {
}
for _, ip := range ips { for _, ip := range ips {
if !ip.IsLoopback() { if isInterestingIP(ip) {
return false return true
} }
} }
return false
}
// isInterestingIP reports whether ip is an interesting IP that we
// should log in interfaces.State logging. We don't need to show
// localhost or link-local addresses.
func isInterestingIP(ip netaddr.IP) bool {
if ip.IsLoopback() || ip.IsLinkLocalUnicast() {
return false
}
return true return true
} }