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package libnetwork
import (
"fmt"
"strings"
"testing"
"github.com/docker/libnetwork/iptables"
"github.com/docker/libnetwork/netlabel"
"github.com/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, "")
}
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