package libnetwork import ( "fmt" "strings" "testing" "github.com/docker/docker/libnetwork/iptables" "github.com/docker/docker/libnetwork/netlabel" "github.com/docker/docker/libnetwork/options" "gotest.tools/v3/assert" ) const ( fwdChainName = "FORWARD" usrChainName = userChain ) func TestUserChain(t *testing.T) { iptable := iptables.GetIptable(iptables.IPv4) nc, err := New() assert.NilError(t, err) tests := []struct { iptables bool insert bool // insert other rules to FORWARD fwdChain []string userChain []string }{ { iptables: false, insert: false, fwdChain: []string{"-P FORWARD ACCEPT"}, }, { iptables: true, insert: false, fwdChain: []string{"-P FORWARD ACCEPT", "-A FORWARD -j DOCKER-USER"}, userChain: []string{"-N DOCKER-USER", "-A DOCKER-USER -j RETURN"}, }, { iptables: true, insert: true, fwdChain: []string{"-P FORWARD ACCEPT", "-A FORWARD -j DOCKER-USER", "-A FORWARD -j DROP"}, userChain: []string{"-N DOCKER-USER", "-A DOCKER-USER -j RETURN"}, }, } resetIptables(t) for _, tc := range tests { tc := tc t.Run(fmt.Sprintf("iptables=%v,insert=%v", tc.iptables, tc.insert), func(t *testing.T) { c := nc.(*controller) c.cfg.Daemon.DriverCfg["bridge"] = map[string]interface{}{ netlabel.GenericData: options.Generic{ "EnableIPTables": tc.iptables, }, } // init. condition, FORWARD chain empty DOCKER-USER not exist assert.DeepEqual(t, getRules(t, fwdChainName), []string{"-P FORWARD ACCEPT"}) if tc.insert { _, err = iptable.Raw("-A", fwdChainName, "-j", "DROP") assert.NilError(t, err) } arrangeUserFilterRule() assert.DeepEqual(t, getRules(t, fwdChainName), tc.fwdChain) if tc.userChain != nil { assert.DeepEqual(t, getRules(t, usrChainName), tc.userChain) } else { _, err := iptable.Raw("-S", usrChainName) assert.Assert(t, err != nil, "chain %v: created unexpectedly", usrChainName) } }) resetIptables(t) } } func getRules(t *testing.T, chain string) []string { iptable := iptables.GetIptable(iptables.IPv4) t.Helper() output, err := iptable.Raw("-S", chain) assert.NilError(t, err, "chain %s: failed to get rules", chain) rules := strings.Split(string(output), "\n") if len(rules) > 0 { rules = rules[:len(rules)-1] } return rules } func resetIptables(t *testing.T) { iptable := iptables.GetIptable(iptables.IPv4) t.Helper() _, err := iptable.Raw("-F", fwdChainName) assert.NilError(t, err) _ = iptable.RemoveExistingChain(usrChainName, "") }