wip: migrate to mono-repo. SPN has already been moved to spn/

service/compat/iptables.go

@@ -0,0 +1,60 @@
+//go:build linux
+
+package compat
+
+import (
+	"fmt"
+
+	"github.com/coreos/go-iptables/iptables"
+)
+
+var (
+	iptProtocols = []iptables.Protocol{
+		iptables.ProtocolIPv4,
+		iptables.ProtocolIPv6,
+	}
+	iptTables = []string{
+		"filter",
+		"nat",
+		"mangle",
+		"raw",
+	}
+)
+
+// GetIPTablesChains returns the chain names currently in ip(6)tables.
+func GetIPTablesChains() ([]string, error) {
+	chains := make([]string, 0, 100)
+
+	// Iterate over protocols.
+	for _, protocol := range iptProtocols {
+		if protocol == iptables.ProtocolIPv4 {
+			chains = append(chains, "v4")
+		} else {
+			chains = append(chains, "v6")
+		}
+
+		// Get iptables access for protocol.
+		tbls, err := iptables.NewWithProtocol(protocol)
+		if err != nil {
+			return nil, err
+		}
+
+		// Iterate over tables.
+		for _, table := range iptTables {
+			chains = append(chains, "  "+table)
+
+			// Get chain names
+			chainNames, err := tbls.ListChains(table)
+			if err != nil {
+				return nil, fmt.Errorf("failed to get chains of table %s: %w", table, err)
+			}
+
+			// Add chain names to list.
+			for _, name := range chainNames {
+				chains = append(chains, "    "+name)
+			}
+		}
+	}
+
+	return chains, nil
+}