hs: more output to debug strings

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

hscontrol/policy/matcher/matcher.go

@@ -2,6 +2,7 @@ package matcher
 
 import (
 	"net/netip"
+	"strings"
 
 	"slices"
 
@@ -15,6 +16,21 @@ type Match struct {
 	dests *netipx.IPSet
 }
 
+func (m Match) DebugString() string {
+	var sb strings.Builder
+
+	sb.WriteString("Match:\n")
+	sb.WriteString("  Sources:\n")
+	for _, prefix := range m.srcs.Prefixes() {
+		sb.WriteString("    " + prefix.String() + "\n")
+	}
+	sb.WriteString("  Destinations:\n")
+	for _, prefix := range m.dests.Prefixes() {
+		sb.WriteString("    " + prefix.String() + "\n")
+	}
+	return sb.String()
+}
+
 func MatchesFromFilterRules(rules []tailcfg.FilterRule) []Match {
 	matches := make([]Match, 0, len(rules))
 	for _, rule := range rules {

hscontrol/policy/v2/policy.go

@@ -297,6 +297,14 @@ func (pm *PolicyManager) DebugString() string {
 		}
 	}
 
+	sb.WriteString("\n\n")
+	sb.WriteString("Matchers:\n")
+	sb.WriteString("an internal structure used to filter nodes and routes\n")
+	for _, match := range pm.matchers {
+		sb.WriteString(match.DebugString())
+		sb.WriteString("\n")
+	}
+
 	sb.WriteString("\n\n")
 	sb.WriteString(pm.nodes.DebugString())
 

hscontrol/types/node.go

@@ -583,6 +583,7 @@ func (node Node) DebugString() string {
 	fmt.Fprintf(&sb, "\tTags: %v\n", node.Tags())
 	fmt.Fprintf(&sb, "\tIPs: %v\n", node.IPs())
 	fmt.Fprintf(&sb, "\tApprovedRoutes: %v\n", node.ApprovedRoutes)
+	fmt.Fprintf(&sb, "\tAnnouncedRoutes: %v\n", node.AnnouncedRoutes())
 	fmt.Fprintf(&sb, "\tSubnetRoutes: %v\n", node.SubnetRoutes())
 	sb.WriteString("\n")
 	return sb.String()