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package libnetwork
import (
"fmt"
"strings"
"testing"
"github.com/docker/docker/libnetwork/iptables"
"github.com/docker/docker/libnetwork/netlabel"
"github.com/docker/docker/libnetwork/options"
"github.com/docker/docker/libnetwork/testutils"
"gotest.tools/v3/assert"
)
const (
fwdChainName = "FORWARD"
usrChainName = userChain
)
func TestUserChain(t *testing.T) {
iptable4 := iptables.GetIptable(iptables.IPv4)
iptable6 := iptables.GetIptable(iptables.IPv6)
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"},
},
}
for _, tc := range tests {
tc := tc
t.Run(fmt.Sprintf("iptables=%v,insert=%v", tc.iptables, tc.insert), func(t *testing.T) {
defer testutils.SetupTestOSContext(t)()
defer resetIptables(t)
c, err := New()
assert.NilError(t, err)
defer c.Stop()
c.cfg.DriverCfg["bridge"] = map[string]interface{}{
netlabel.GenericData: options.Generic{
"EnableIPTables": tc.iptables,
"EnableIP6Tables": tc.iptables,
},
}
// init. condition, FORWARD chain empty DOCKER-USER not exist
assert.DeepEqual(t, getRules(t, iptables.IPv4, fwdChainName), []string{"-P FORWARD ACCEPT"})
assert.DeepEqual(t, getRules(t, iptables.IPv6, fwdChainName), []string{"-P FORWARD ACCEPT"})
if tc.insert {
_, err = iptable4.Raw("-A", fwdChainName, "-j", "DROP")
assert.NilError(t, err)
_, err = iptable6.Raw("-A", fwdChainName, "-j", "DROP")
assert.NilError(t, err)
}
arrangeUserFilterRule()
assert.DeepEqual(t, getRules(t, iptables.IPv4, fwdChainName), tc.fwdChain)
assert.DeepEqual(t, getRules(t, iptables.IPv6, fwdChainName), tc.fwdChain)
if tc.userChain != nil {
assert.DeepEqual(t, getRules(t, iptables.IPv4, usrChainName), tc.userChain)
assert.DeepEqual(t, getRules(t, iptables.IPv6, usrChainName), tc.userChain)
} else {
_, err := iptable4.Raw("-S", usrChainName)
assert.Assert(t, err != nil, "ipv4 chain %v: created unexpectedly", usrChainName)
_, err = iptable6.Raw("-S", usrChainName)
assert.Assert(t, err != nil, "ipv6 chain %v: created unexpectedly", usrChainName)
}
})
}
}
func getRules(t *testing.T, ipVer iptables.IPVersion, chain string) []string {
iptable := iptables.GetIptable(ipVer)
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) {
t.Helper()
for _, ipVer := range []iptables.IPVersion{iptables.IPv4, iptables.IPv6} {
iptable := iptables.GetIptable(ipVer)
_, err := iptable.Raw("-F", fwdChainName)
assert.Check(t, err)
_ = iptable.RemoveExistingChain(usrChainName, "")
}
}
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